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Natural mineral water treatment agent, is a compound of aluminum silicate as the main raw material of non-metallic minerals, the new product by the specific treatment process technology and made with chemically synthesized water treatment agents are fundamentally different. There are two kinds of slurry and its state of powder. Nature acidic, PH value 3-4. Slurry proportion of 1.5 to 1.6, 1.2 to 1.3 specific gravity powder. Color gray to dark gray. Natural mineral water treatment agent has five characters: adsorption, ion-exchange, cracking resistance, chemical conversion, physical help fertility. Application advantages: (1) The most important advantage is that can control all kinds of tricky, especially toxic waste water; (2) to clear a little floating thereof; (3) flocculation and sedimentation speed, sediment low moisture content, density is high, dehydration, and easy to press filtration process; (4) waste water treatment facilities and the process is simple, easy to operate, greatly reducing the time investment in construction projects, while operating costs are not high; (5) generated by sewage treatment, used as agricultural fertilizer admixtures have synergistic effect, because of the weight of the mineral raw materials originally fertilizer additive. Thus completely eliminate the secondary pollution. In the water treatment industry, not only various types of water treatment devices are widely used, water treatment chemicals for various industries make a great contribution. Water treatment chemicals include corrosion inhibitors, flocculants, reducing agents, biocides, catalysts, cleaning pre-film, etc., each agent has its own role and characteristics.
Central heating has many advantages: First, to improve energy efficiency, energy conservation; secondly, easy to take measures to reduce air pollution, to achieve the use of local low-quality fuel and waste; third, can greatly save space, reduce operating costs, reduce labor, improving the environment and hygiene; and fourth, because the central heating mode is easy to implement scientific management, but also can improve the quality of heating. Central heating has been developing in recent years. From 2001 to 2015 the development of central heating Plate heat exchanger small size, light weight, high heat transfer efficiency, the central heating system has been widely used. However, due to the small flow cross-section and low turbulence level, fouling, clogging becomes cause lower efficiency plate heat exchanger mastermind, seriously affecting the heating effect, resulting in a significant increase in equipment energy consumption and shorten the life of the equipment and increase the maintenance cost of the equipment. How exchanger maintenance it? Europe · Yake Fei think for central heating heat exchanger, mainly to ensure water quality and adding corrosion inhibitor, and the proper and safe cleaning of heat transfer equipment, strengthen the daily water management, will be able to alleviate the heat exchanger plate junction dirt and corrosion problems. The maximum extension of the life of heat transfer equipment, achieved good social and economic benefits. First, routine maintenance 1, to prevent the formation of scale, corrosion There are two main ways: one is demineralized water to supplement water, reduce water calcium and magnesium ions and chloride ions, but such high operating costs, and the need to strictly monitor the system circulating water hardness, pH, alkalinity, chloride , suspended solids and other major technical indicators, timely adjustment; the most common method is the direct use of water as make-up water in the system dosing corrosion inhibitor, prevents the formation of calcium and magnesium scale and corrosion under the scale. Clean up environmental R & D qd-366 supramolecular corrosion inhibitors, are selective by supramolecular recognition and agent-assembly, the metal surface is better than nanofilms supramolecular film, lotus leaf surface effect similar nature may refuse pollution, prevent corrosion, changing the traditional treatment for the metal surface quality and stability of supramolecular membrane treatment. qd-366 is stable and can withstand high pH, ​​high hardness, high turbidity, excellent performance, allows the system to run at a high concentration of natural pH value, the general water quality, K value of up to 10, is the general agent ( K = 3 ~ 5 times 2-3) of water saving. Both corrosion inhibition may be dispersed scale of carbonates, phosphates, sulfates, silica-magnesia salt scale and so has excellent scale performance. 2, exclude or reduce impurities in the circulating water, suspended solids, etc. In dynamic circulating water, including suspended solids sediment, residue, particles, biological slime, as well as equipment corrosion products iron oxide, copper and the like. It is learned that in the supplementary addition of water and return pipe line filter and wash, can remove a portion of large particles suspended impurities. Initial Commissioning of the system backwater strengthen flushing sewage. To drain the corrosion products and impurities left outage during construction. And daily operations should also be regular sewage, reduce suspended impurities. 3. Adjust the appropriate flow rate As far as possible to ensure the flow velocity distribution in the heat exchanger should be uniform in order to avoid a large velocity gradient, to ensure uniform temperature distribution; to ensure reasonable pressure drop and without cause corrosion under increasing the flow rate can help reduce dirt to scale Corrosive. Second, is the heat exchanger fouling cleaning Domestic plate heat exchanger can be used to clean detachable way, but disassembly required downside is labor-intensive, long time, and with the increase in the number of removable plates can cause aging and uneven stress sealing strips follow-up questions deformation. While imports of welded plate heat exchanger is integral, but can not be washable, so online cleaning cycle has become the central heating system to solve clogging the plate heat exchanger fouling the best approach. Dong Tao chemical production cleaning pre-film is at room temperature, under neutral conditions supramolecular selective use of chemical self-assembly of functional chemical cleaning and passivation of corrosion products, with the dual role of cleaning and pre-film, and in the application process cleaning speed, cleaning effect, film speed, film compact and uniform corrosion rate and so on. With a non-corrosive, non-polluting, high cleaning advantages, and do not need to be specially cleaned passivation, can effectively clean the heating system heat exchanger.
City water is not as deep treatment, all for circulating water to add water; reverse osmosis concentrated water as a resource, but also as circulating water to add water. First, the implementation of water directly as recycled water to add water, strong water multiples do 3.0 ratio. At 3 different time, the device is operating normally, the recirculating water concentration rate can be increased to 4.0, running 3 each should time, it may be implemented as a circulating water concentration of water make-up water. Concentrated water up into the circulating water system, the water first with 9: 1 ratio, two months running normal, then were mixed at a ratio of 8.2. And the concentration of water in the water 8: 2 mixed 6 months of operation, rate 4.0, circulating water system without fouling corrosion-free, stable case made full hair units may be circulating water through the sewage water treatment plant Coagulation , sedimentation, clarification, filtered, and then return to the circulating water system, waste water resource compounds circulating water zero discharge in the true sense. Waste water resources, recycling water high rate until zero emissions is a systems engineering. As a guide for the operation of water treatment technology is based on three patents and a number of simulations of scale and corrosion inhibitor. Due to the stability of sewage water quality and quantity is poor, and because non-continuous operation of the reverse osmosis equipment, greatly affected by seasonal factors, therefore, in accordance with the circulating water CL- content and add water CL- content to calculate the circulating water Concentration Ratio, is very precise things. How to do? The best way is to do all kinds of make-up water measurement and test work, but also to do the work of the sewage water metering. Supplemented with sewage water divided by the amount of water that is circulating water concentration ratio, can provide a reliable basis for dose adjustment of circulating water. Obtain a highly concentrated in the circulating water rate or zero emissions, the circulating water quality of the data and when the reaction condition is the same scale, A, B, C value has no meaning here. The only methods of surveillance is to monitor the physical inspection and cooling effect. The so-called physical inspection, is a day of cooling tower water cement column careful observation site, part of white water, is scaling up. If the water to keep the site no fouling signs on cement qualities. Corrosion was observed on the situation, that is, in the cooling tower basin, put a steel plate, so that the water tower came on steel, the rust, blister rust occurring on steel, stainless tumor that signs of corrosion, if the steel does not rust, rust tumor and so that the system has no evidence of corrosion. In order to prevent scaling and corrosion problems occur, we must pay close attention to the physical appearance of the cooling effect of the circulating water system and the cooling tower. In the event of fouling occurs by increasing the dose, the scale can be removed. In case of occurrence, can additionally dosing inhibitor (ATMP) and pre-film, were pre-film corrosion. In order to prevent high-impact heat haze effect, it may be appropriate to transfer large circulating water flow rate, or reduce recirculating water concentration rate, increasing the volume of sewage treatment plants and then purified through the circulating water system. In short, ground observation, ground adjustment, good anti-fouling, corrosion, deposition of mental preparation and technical preparation, so be prepared and take preventive measures. Municipal water, reverse osmosis concentrated water and recycled water - water blowdown technology for circulating cooling water system, it is a great initiative. First to emancipate the mind, innovation, good at innovation. Solve water resource problems through innovation. While cautious, maintaining stability, step by step, to ensure the safe operation of the unit, and stabilize the hair, in the case of full-fat, circulating water gradually implemented innovative initiatives.
Results and Discussion 2.1 Effect of the amount of chain transfer agent The chain transfer agent effective to increase radical free radical chain transfer, for adjusting the relative molecular mass of water treatment chemicals PAA. Under test conditions 1.2, change the chain transfer agent AYA the amount added in an amount of monomer molar mass percentage, using gel chromatography profile measured at different concentrations of chain transfer agent phosphate-free preparation of polyacrylic acid the molecular weight, the results shown in FIG. 1. As can be seen from Figure 1, with the chain transfer agent AYA concentration increases, the molecular weight of PAA decreases rapidly when the concentration increased to 8%, PAA weight average molecular weight approaching 3025, when the concentration increased to 12%, PAA The weight average molecular weight approaching 2012, follows: the chain transfer ability and amount of the chain transfer agent has a great relationship, the greater the amount of chain transfer ability is stronger. In the polymerization, a chain transfer agent will not be able to control molecular weight and molecular weight distribution of the polymer to make narrow, making it stable polymer properties. Therefore, when you want to preparing low molecular weight polyacrylate need to select the appropriate concentration of the chain transfer agent according to the situation. 2.2 molecular weight regulator Under experimental conditions 1.2, effects of different molecular weight modifier CC and CF affect the molecular weight of PAA, shown in Figure 2. As can be seen from Figure 2, a molecular weight modifier without using synthetic PAA broad molecular weight distribution and poor attention, after the catalyst is very stable and controlled molecular weight distribution, and the use of CF CC is better than the stability, by screening, We use CF as a catalyst. Under experimental conditions in 1.2, 5 times parallel experiments, study the different amount of PAA CF weight average molecular weight of influence, in a way the average deviation of statistics, the results shown in Figure 3. As it can be seen from Figure 3, with the increase in the amount of CF, PAA weight average molecular weight of a small change in the value of great changes, when the amount of> 60mg / L, the effect of weight average molecular weight of small and stabilized. Therefore, we choose 60mg / L as a suitable catalyst. 2.3 amount of initiator Under the experimental conditions 1.2, change the amount of ammonium persulfate initiator is added, the amount added to the monomer molar mass%. Use gel chromatography molecular weight were measured at different concentrations of chain transfer agent Preparation of PAA, the results shown in Figure 4. During the reaction, the production of thermal decomposition of ammonium persulfate in mind even sub-radical polymerization initiator a monomer. Initiator and initiator initiation efficiency thermal decomposition rate of molecular weight PAA influential. Through the analysis we can see in Figure 4 with increasing initiator concentration, molecular weight PAA presented slightly decreased after the first rise, because the amount of initiator is low enough to trigger a lot of their polymerization of monomers, and when the initiator concentration too high, acrylic transient response, resulting molecular weight is too high. Therefore, the amount of initiator should be used between 5% -8%. 2.4 The reaction temperature Under 1.2 Test conditions, consider the impact of different temperatures on the PAA molecular weight, the results shown in Figure 5. By observing Figure 5 it can be seen: when the temperature is below 50 ℃, the polymerization reaction can not be carried out; as the reaction temperature, the molecular weight of the PAA gradually increased, 60 ℃, the molecular weight of a maximum value; T> 60 ℃ when molecular weight decreases and slowly increased. To arrive at a molecular weight of PAA with temperature changes in the law. But when the temperature is high, the reaction speed, the reaction is not easily controlled. Thus, according to the actual needs of the molecular weight, the reaction temperature was chosen 80 ℃. 2.5 Effect of monomer concentration Under test conditions 1.2 to monomer concentration as an index, consider the quality of acrylic monomers on the molecular weight of the PAA, the results shown in Figure 6. As it can be seen from Figure 6, along with additional monomer concentration, molecular weight first and then decreased. When the monomer concentration is approaching 60 percent, the weight average molecular weight of 2124, after issuance with the monomer concentration, the viscosity of the reaction system increases, could easily lead to the accumulation of material is formed implosion, it is not conducive to the reaction. Thus, according to actual needs, select the appropriate concentration of 60%. 2.6 orthogonal test According to univariate analysis, factors determining the orthogonal experiment analysis and the corresponding factor level. Experiments were performed to PAA weight average molecular weight Mw as an index, select the concentration of initiator W initiator, transfer agent AYA mole percent of chain Mp, chain regulators CF concentration Wcf, temperature Orthogonal Experimental Principle select L16 orthogonal test table . As shown in Table 1 and Table 2 below. According to the table K1, K2, K3, K4 and extreme R analysis of various factors on the weight average molecular weight of PAA affect the size of the order of B> A> D> C> E, optimal conditions for the A1B3C4D4E3. PAA to choose the optimum conditions of preparation, having a weight average molecular weight of 2495. 3 Conclusions (1) This paper examines the monomer concentration, the amount of initiator, chain transfer agent, reaction temperature and the molecular weight modifier selection and dosage on phosphorus weight average molecular weight sodium polyacrylate; (2) Based on the various factors affecting the synthesis of phosphorus polyacrylic acid analysis and discussion, come to synthesize low molecular weight polyacrylic acid suitable conditions are: the use of CF as a chain regulator, the amount of: 70ppm; initiator concentration: 5% ; chain transfer agent AYA concentration: 8.5%; reaction temperature: 90 ℃; monomer concentration: 60%.
Organophosphates are water stabilizer larger a class of products, since these products generally have corrosion and scale, decentralized functions, the number of products is not only more, and the scope of application is relatively wide and therefore yield relatively and more, the current production of organic phosphorus to meet domestic needs, but also exported to all over the world. The development of organic phosphate is also a process, from the last century 60--70 years HEDP, ATMP and other products are widely used, the end of the 1970s and 1980s the PBTCA and HPA product, not of improving its performance, and now appeared large organophosphate molecule, PAPEMP and POCA they not only have excellent calcium tolerance, can increase the total alkalinity, calcium hardness greater than 1500mg / L. At the same time, to better disperse iron, zinc, manganese oxide, but also meet the water quality high temperature, high salinity, high concentrations, and has good corrosion resistance, thereby enabling the circulating water running at high concentration . In the last century we have developed a new type of organic phosphorus N, N-methyl-aspartate double phosphoryl (BC-620) product, its performance and PAPEMP, basically the same, which is also slightly better terms of calcium carbonate scale resistance, corrosion performance than HEDP, versatility in application to large circulating water device for cleaning pre-film achieved outstanding results. An organic phosphorus N, N-methyl aspartic acid bis phosphoryl characteristics 1.1 molecular structure and molecular weight: 1.2 Matter Appearance: red transparent liquid, solid content of 30% and a density (20 ℃) ​​1.15-1.20mg / cm³, ph <2.5, total phosphorus ≤20%, n p <1%, phosphorous <5%. II. Performance 2.1 for determination of calcium carbonate scale Test Method: Sinopec methods. Test conditions: 80 ± 1 ℃, 10h. Test water quality: Ca + 2 500mg / L, total alkalinity 250mg / L Test Results: As can be seen from Table 1, the highest rate of BC-620 scale, 10mg / L reached 76.72% while the ternary and binary copolymer is relatively low, PAPEMP after the BC-620. 2.2 corrosion rate determination Test Method: Sinopec methods. Test conditions: 72h, 50 ℃, A3 steel. Test water quality: Ca + 2 500mg / L, total alkalinity 250mg / L, ph8.8. Test Results: As can be seen from Table 2 HPA best, followed by BC-620, and HEDP gap.
Acrylic chemical structure containing a carboxyl group, an unsaturated double bond, very lively nature. In the role of initiator acrylic double bond is opened, the polymerization reaction may be aqueous and organic solvents, polymerization initiators of different agents due to select the type, amount and the chain transfer agent and the reaction conditions, the viscosity can be made, different molecular weight polymer, its molecular weight distribution is different, there was a marked difference in their use. Extreme polymerization of acrylic monomers, polyacrylic acid can be obtained by bulk polymerization methods, solutions, emulsions and suspensions, etc., it is consistent with the general rule of free-radical polymerization. But the traditional synthetic methods is difficult to obtain a lower molecular weight polyacrylic acid, therefore, to strengthen the low molecular weight polypropylene acid synthesis and study of low-cost manufacturing technology has a very important meaning. Conventional free radical polymerization method persulfate (ammonium persulfate, sodium persulfate, potassium persulfate, etc.) do initiator, isopropanol and the like may be added as a chain transfer agent molecular weight regulator, in an aqueous phase polymerization system acrylic polymers PAA, through advance after adjusting PH monomer or polymer to complete part or all of neutralization and get PAAS. We know that the lower the degree of polymerization of PAA (S) better performance DISPERSOR, back in the 1970s and 1980s, a series of reports on foreign patent literature, molecular weight modifier was added isopropanol, butanol , t-butanol, sparse acid, mercaptoethanol, thioglycolate, mercapto succinic acid, hydrated sodium phosphite dioxide and acetic acid copper. This method can be worth Molecular Weight of 10,000 or less, but there is a large amount of initiator, a large amount of chain transfer agent and can not be completely removed, resulting in uneven polymerization broad molecular weight distribution (when used alone caused particularly evident sulfate), polymeric rate is not high tends to remain unreacted acrylic monomer and other additives, molecular weight reduction limited extent, high energy consumption, high cost, the study found. Such polymerization system state reaction at high temperature reflow, help to reduce the molecular weight, but it also increases color the products in question to be negative, and therefore, the conventional polymerization method is simple, but there are many drawbacks, need to be improved or the development of more effective The polymerization process. Northwestern Polytechnical University High fengqin low molecular weight sodium polyacrylate legal preparation dynamic solution polymerization, and to explore the chain transfer agent (isopropanol or acetone or carbon tetrachloride, etc.) the type and amount of initiator concentration, polymerization temperature, monomer concentration and other factors on product viscosity average molecular weight. Study results showed that: when the monomer aqueous solution of 50% by mass, the amount of initiator is 4% by mass of the monomer, the chain transfer agent in an amount of monomer mass of 200-300%, the polymerization temperature is 80-90 ℃, reaction time 6H time. It can be synthesized by a series of molecular weight sodium polyacrylate 600-7000. Bayberry use solution for preparation of low molecular weight sodium polyacrylate (molecular weight 2000-3000), a chain transfer agent isopropanol concentration is 130% -225%, the temperature is below 57 ℃, select the initiator concentration of about 2%. However, this method requires a large amount of chain transfer agent, the molecular weight after experimental verification only reduced to about 3,000.
1 Find a Cause In order to identify the causes of deterioration of water quality as soon as possible, we are circulating a comprehensive analysis of water quality, and the deterioration of water quality before and after the data were compared, in Table 1. By comparing Table 1 cycle before deterioration of water quality water quality indicators, we find recent circulating water turbidity, heterotrophic bacteria, COD content soared, with sleep bubble, initially suspected leak row cold methanol, methanol leak into the circulating water system cause deterioration of water quality. Therefore, we were focused on the cold row methanol investigation found 1 # methanol gas leak. Thereby determining methanol circulating water quality deterioration due to leaks. 2 analyze the reasons (1) methanol circulating water, under the action of cellulase, it will effect the production of methyl cellulose and cellulose is a natural polymer surfactant, when the mass concentration of the aqueous solution of methyl cellulose reaches 40-50mg / is L, after intense shaking will blister. Cellulose and cellulase derived from recycled water distribution system in the cell walls of plants and fungi, algae secretions. (2) carbon-containing compound is methanol, microbial nutrient source. Methanol into the circulating water can cause microbes multiply, increase product slime, causing increased turbidity. (3) next to the filter low filtration efficiency, import and export turbidity only difference 10mg / L, not quickly, effectively remove turbidity. In addition, the arrangement of cold water is the water distribution is not uniform, cold drainage flow is small, has created favorable conditions for the slime deposition. (4) slime attached and hang the sheet surface heat transfer equipment, cut off from the explosive effect of water treatment chemicals for household metal, the metal causing severe corrosion scale, resulting in excessive corrosion rate of carbon steel coupon. (5) daily dosing of methanol and hypochlorous acid react fungicides fungicide ,, resulting in insufficient quantity, or even not achieve sterilization agent. Insufficient amount of time fungicides, resulting in an increase in microbes and algae outbreaks. 3 Actions (1) the elimination of leak sources Look out for equipment leaks will immediately cut out from the system, if they really can not be cut, it should be allowed to discharge cycling backwater place, to avoid affecting other heat transfer equipment and the entire circulating water system. To prevent similar accidents, the timing of the possible leakage of water equipment, site analysis, once discovered in time. (2) reduce the concentration index Methanol leak regret cause serious deterioration of water quality, in order to minimize the deterioration of water quality of circulating water system in Weihai, should increase the sewage water and fill the water. (3) Optimization of fungicides Since methanol reacts with hypochlorous acid fungicides, causing insufficient amount fungicide. Thus, after a pause or increase the methanol spill response hypochlorite oxidizing biocides class dosage, a corresponding increase isothiazolin-one, quaternary ammonium salts and other non-oxidizing biocides dosing frequency.
Pre-film processing is provided immediately after chemical cleaning systems, the system put in a considerable amount of pre-film, the metal surface quickly form a protective film layer intact inhibition to prevent a greater initial corrosion. Consider the large amount of water cycle, usually at room temperature using pre-film. Step 1 Pre-film (1) closed cooling tower inlet valve, open loop backwater valve bypass pipe, supplementary circular tanks to the maximum level. (2) to be cast to the circulating pool consisting of polyphosphates and zinc pre-film 1000 mg / L (according to maintain water volume of 1200 kg). Open a circulating pump circulating water system to keep the water velocity in 0.5 ~ 1.0m / s between. Sulfuric acid was then added to adjust the pH, a pH of between 6 and claim 7, a high concentration of pre-film thin, dense protective film can be quickly formed on the metal surface. After the pre-film 8 h dosing DISPERSOR 100mg / L (according to maintain water volume 120kg). Throughout the pre-film process pH is maintained at 6-7. Pharmaceutical dosing system circulation after 2 h measured total inorganic phosphorus in water, such as less than 150mg / L concentration should be supplemented to a prescribed drug. Pre-film time: hot pre-film is 48h; cold pre-film is 72h. When the pre-film control pH 6-7, sulfuric acid regulation. Stop the replacement at the end (3) pre-film circulating water system water replacement system, inorganic phosphorus less than 7mg / L, dosing scale and corrosion inhibitor into the normal operation of the process. (4) The pre-film projects and frequency analysis are shown in Table 3. 2 Monitoring and cleaning pre-film schedule Cement plant waste heat power generation cycle cooling water system to monitor the effect of Cleaning pre-film usually coupon direct monitoring method. Hanging sheet material and the heat exchanger pipes should be of the same material, namely carbon steel (Q235 steel), stainless steel, copper specimen. Each of the four, a total of three groups. Specimen size of 50cm × 25cm × 2.0cm, hanging from the top of the hole located at the center line of 4.0cm. Chemical Cleaning before the three hanging pieces on the circulating pump water pool by mouth. After cleaning remove the coupon measured corrosion rate. Reload new coupon effect was observed when the pre-film deposition. Cleaning effect detection: carbon corrosion rate ≤3g / (m2 · h), stainless steel and copper <0.5 g / (m2 · h). Pre-film effect Inspection: visual, colorful steel surface has a uniform film; try dope testing, membrane discoloration drip response time difference is greater than 10s. Different circulating water pH and turbidity effects of pre-film are shown in Table 4 and Table 5. Cleaning pre-film schedule shown in Table 6.
It is the general term for a class of water treatment chemicals for water treatment chemicals, widely used in petroleum, chemical, metallurgy, transportation, light industry, textile and other industrial sectors. Water treatment chemicals include corrosion inhibitors(ATMP), reverse osmosis scale inhibitor, biocide, flocculants, cleaning agents, cleaning agents, pretreatment filming agent and the like. In practical applications, often using a complex formula of water treatment chemicals, or a combination of the application of various types of water treatment chemicals. Therefore, it is necessary to pay attention to the complex due to inadequate generating antagonism between the components, so that the effect of reduction or loss, but also to take advantage of synergies (when synergies arising from the coexistence of several pesticides) and efficiency. In addition, most of the water treatment system is an open system, there will be some emissions when used to consider the impact of various types of water treatment chemicals to the environment.
Multifunctional water treatment agent domestic research began in the mid-eighties, originally proposed by the South China University of Technology, a modified natural polymer used in the oil field agents CAG purification Wu said the study, which is a natural polymer F691 powder modified anionic flocculant, we found both scale inhibitors, corrosion inhibitors, function and flocculation. Floc studied film, corrosion and scale film and its film formation, its main molecular structure has some direct connection of linear polymer containing -COO -, - OH, -CONH other active groups, in order to improve its performance and on the basis of a water-soluble been further modified, such as CGA-SP, CG-A3, CMT-A, CMT-A2 and the like. Which CGA CGA-SP on the basis of water-insoluble lignin sulfonated, then connect the -PO other active groups, that is, strengthening the flocculation purification, increased small molecule inhibition - scale group points. In recent years, huang shaobin, who has conducted research and development of natural polymer-modified heterocyclic quaternary water treatment agent, such as synthesis of both flocculation, corrosion and fungicide in one of the FQA-C, and in terms of the mechanism proposed flocculation - double deposition inhibition model, decreasing flocculation - increasing fungicide cooperative mechanism model, lay the foundation for the future development of multi-functional agent. Pan Xiaoting isoquinoline such as the use of natural products heterocyclic quaternary ammonium modified F691 powder prepared colleagues flocculation, corrosion, scale and biocide in one of the FIQ-C. Isoquinoline access only enhanced flocculation original natural polymeric substance, while increasing the hydroxyl, quaternary ammonium salts and other new functional groups to increase their effectiveness. Hunan University of Science and Technology Liu Lihua other science a flocculation - polymer water treatment chemicals patented double-effect fungicide. Its long straight chain structure constituted macromolecular polybutylene, hydrochloric acid side chain structure and quaternary ammonium functional groups structure. Backbone is diallylamine polymerization, the side chain is an ammonium salt of hydrochloric acid and epichlorohydrin open loop, connect the secondary amines, quaternary ammonium form quaternary ammonium salts. Flocculation and sterilization to achieve two processes at the same time, in complete microbial sterilization colleagues speak dirt residue suspended together with a large settlement to settlement plot purposes. Shun stone deposit and other naphthenic imidazoline derivatives as Pickling agent oilfield water treatment agent of corrosion, fungicide research performance, compared with the current domestic Wing largest inhibitor, better inhibition effect , but also has good solubility and thermal stability, the operation more convenient; In addition, since the sterilization antibacterial imidazoline ring can neutralize the negatively charged surfaces of bacteria and algae cationic groups contained in the derivative and, oilfield sterilization experimental results show it has a bactericidal effect in oilfield wastewater. xia zheng rong skiing and other Hubei Institute, starch graft quaternary ammonium compounds established both emulsion breaking, flocculation, corrosion three efficacy LBT6, and to study its application in oily wastewater treatment. In addition to flocculation - corrosion, the flocculation - fungicides, flocculation - sterilization - inhibitor, flocculation - corrosion - scale inhibitor research has made pioneering progress. Development of multifunctional water treatment agent Problems Research on the multi-functional water treatment agent started late, less investment in research and development, pharmaceutical analysis and detection of the corresponding supporting technology level is not high on the mechanism of agents, such as research synergies between them is not enough; in the development of synthetic Temple of Heaven and many more aspects of polymer modified multifunctional water treatment chemicals, and few synthetic multifunctional water treatment agent, and its molecular weight is difficult to achieve real-time control, affect its scale inhibitors, corrosion inhibitors, flocculants, sterilization like performance of mining, thereby constraining the development pace of the multi-functional water treatment agent; variety of drug development are not many, to enter the market is small, and basic research is also relatively weak. Trends multifunctional water treatment chemicals Since the research and development of multi-purpose water treatment agent than single-function drug is much more complex, so the research of multi-purpose water treatment chemicals has made some progress, its future single research function needs to face many problems in the study of mechanism of action to achieve industrial application and gradually replace the single agents and complex aspects of dispensing agents, obviously it will take a very long way to go. In order to study multifunctional water treatment agent, the agent requires economical, efficient, good thermal stability, security, energy efficiency direction, but also requires dosing process is simple, lasting effect. In addition, to the corresponding requirements of environmental regulations to protect the environment, multifunctional water treatment agent to meet the phosphorus or phosphorus, non-toxic, adaptable, able to adapt to high-intensity, high hardness, high water quality in asking. Development and application of environmental protection with the demand for increased awareness of energy conservation and more demanding applications, so having both flocculants, corrosion inhibitors, scale inhibitors, fungicides, and other multi-functional water treatment agent has a very great potential and market.

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