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General classification of water treatment agents

2016-10-22 01:57:58

    At present, China's emphasis on the management of the environment is growing, water treatment manufacturers have sprung up. A variety of water treatment agents enrich the market, but the type of water treatment chemicals is nothing more than a few, faceted Xiaobian to introduce you to the types of water treatment agents to facilitate your needs.
    Also known as sterilization algicide or sludge stripping agent, anti-sludge agent, refers to a class of bacteria used to inhibit the growth of bacteria and other bacteria in order to prevent the formation of microbial sludge of chemicals. Usually divided into oxidizing fungicides and non-oxidizing fungicides two categories. Oxidative fungicides, such as commonly used chlorine, sodium hypochlorite, bleaching powder, etc .; non-oxidative fungicides in good effect, the more widely used is to destroy the bacterial cell wall and cytoplasmic chemicals, such as quaternary ammonium salts. Quaternary ammonium salt such as
dodecyldimethyl benzyl ammonium chloride (1227) or bromide dodecyl dimethyl benzyl ammonium, etc., often both sterilization, stripping, corrosion inhibition and other effects, there are Development prospects, has been used in oilfield water, industrial cooling water and so on.

    Also known as anti-scaling agent, refers to a class of water can inhibit calcium, magnesium and other scale into the formation of scale scale salts of chemicals. Inorganic inhibitors such as sodium hexametaphosphate, sodium tripolyphosphate, etc .; organic, polymer scale inhibitor, in which the best effect of polymer scale inhibitor, has great development prospects. There are two kinds of organic and macromolecular scale inhibitors used in water treatment: (1) organic phosphonic acids such as DTPMPA (diethylenetriamine pentamethylene phosphonic acid), EDTMP (ethylene diamine tetramethylene phosphonic acid ), HEDP (hydroxy ethylidene diphosphonic acid); ② polycarboxylic acid, such as polyacrylic acid salt PAA (S), hydrolyzed polymaleic anhydride HPMA and so on. The scale inhibition of these two types of scale inhibitors is usually achieved through lattice distortion and dispersion-condensation, and is widely used in oilfield water, boiler water and industrial cooling water systems.
    A class of chemicals used to remove or reduce turbidity or suspended solids in water and to speed up the settling of impurities and sludge in water. Flocculant is the first application of inorganic flocculants, such as alum, ferric chloride and so on. Organic and polymeric flocculants are widely used in flocculants for water and wastewater treatment. Can be divided into anionic flocculants, such as carboxymethyl cellulose, sodium polyacrylate, etc .; cationic flocculants, such as polyethylene amine; there are non-ionic flocculants, such as polyacrylamide. Their flocculation is mainly through the charge neutralization, adsorption bridging effect to achieve.
Corrosion inhibitor
    A class of appropriate concentration and form of dosing in the water, you can prevent or slow down the water on the metal materials or equipment, chemical corrosion, with good results, with less, easy to use and so on. Many types and varieties of corrosion inhibitors, according to the types of compounds can be divided into inorganic and organic corrosion inhibitor corrosion inhibitor. According to its inhibition reaction is anodic reaction, cathodic reaction or both, can be divided into anode type corrosion inhibitor, cathode type inhibitor or mixed type corrosion inhibitor. Corrosion inhibitors can also be formed on the metal surface in accordance with the mechanism of the protective film is divided into passive film type, the type of film and adsorption membrane type adsorption. At present, the commonly used in the water treatment of passive film inhibitor such as chromate, nitrite, molybdate, etc .; commonly used precipitation film type inhibitor of polymerized phosphate, zinc salts; commonly used adsorption film Type corrosion inhibitors such as organic amines.
     In the pretreatment step of the water treatment, a class of chemicals capable of previously forming a protective film on the surface of the metal. The purpose of pre-film has two: First, the use of chemicals to improve the initial concentration of corrosion inhibition; the second is to use a dedicated pre-filming agent in order to normal operation, adding a small amount of corrosion inhibitor, can Maintenance and repair of protective film, saving drugs and costs. Commonly used pre-filming agents are sodium hexametaphosphate plus zinc salt, sodium tripolyphosphate and so on.
 Oilfield water treatment in the application of a special chemical, can remove the oily sewage in the mechanical impurities and oil, its role in addition to the separation of suspended solids from the flocculant or mechanical impurities, but also has the role of oil and water purification purification. Therefore, this cleaning agent in addition to containing the general flocculant components such as aluminum, polyacrylamide, etc., often contain some surfactants. For the purifying effect of purification, the general use of thin-film filter to be measured, with the filter factor (see filter), said the size of the purification effect is good or bad.
    A class of cleaning chemicals. In the pretreatment step of water treatment, some chemicals are often needed to clean the deposits on the surface of metal equipment, such as corrosion products and scale, as well as microbial slime and so on. According to the different requirements of cleaning, cleaning agents can be divided into acid cleaning agents such as hydrochloric acid, sulfuric acid, hydrofluoric acid, citric acid, etc .; passivation agent such as sodium benzoate. At present, the use of sulfonated succinate di (α-ethylhexyl) sodium salt, it is a surfactant, as a special cleaning agent for cleaning metal surface oil and floating rust and other impurities.


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