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The practice has shown that the use of water treatment chemicals is still the main method for the stable treatment of water quality.

For systems with a constant hydration water source, the concentration factor should be strictly controlled. For systems that do not have a constant hydration water source or partially supplement weak acid softened water, care should be taken to control the proportion of various hydration to ensure the stability of the system water quality. For systems that use alkalinity to adjust alkalinity, the rate of continuous dosing should be strictly controlled.

The water treatment chemical used should be familiar with the hardness tolerance, alkalinity tolerance and other properties of the chemicals.

Choose A Composite Water Stabilizer with Excellent Comprehensive Performance

Nitrogen-containing heterocyclic compounds such as mercaptobenzothiazole, benzotriazole, benzimidazole, polybenzimidazole have a strong affinity for metallic copper. They combine with covalent and coordinate bonds with copper ions to form a dense protective film. The dissolution reaction of the non-ferrous metal is blocked by adsorption on the reactive site of the metal surface.

Therefore, the composite water stabilizer should contain a sufficient concentration of thiazoles or other substances having the same function to ensure good corrosion inhibition.

For water quality with high hardness, high alkalinity, high pH properties, the usual scale inhibitors (such as ATMP, EDTMP, HPMA, PAA, etc. commonly used in power plant circulating water systems) often fail to meet their requirements.

In this case, a new type of component having excellent hardness and alkali resistance properties should be used. Suitable agents for the “three high” poor water quality include PBTC, PESA, POCA, PAPEMP, and other multi-component copolymers.

PBTC chemical
PBTCA has an excellent scale and corrosion inhibition properties. It is resistant to high temperatures and oxidation and has an excellent inhibitory effect on calcium carbonate scale. PBTCA has good synergy with organic phosphates, zinc salts and the like.

PESA (poly epoxysuccinic acid) has excellent chemical and thermal stability. It has excellent scale inhibition and dispersion effect on calcium carbonate and calcium sulfate. PESA and zinc salt compound has excellent corrosion and scale inhibition performance. It is a green water treatment chemicals with no phosphorus, non-nitrogen and good biodegradability.

POCA (phosphonocarboxylic acid) and PAPEMP (polyaminopolyether based organophosphorus acid) have high calcium tolerance and excellent chemical stability, oxidation resistance (nearly interacting with chlorine) and thermal stability. They have excellent scale inhibition and dispersion for calcium phosphate, calcium sulfate, zinc salt deposition, and iron oxides.

These water treatment chemicals are suitable for water treatment with high hardness, high alkalinity, high pH and high concentration multiple. It is the ideal agent for the treatment of “three high” water quality in China.

Other multi-component copolymers such as PCA, AA/AMPS copolymers, etc., also exhibit good performance in the three-high system. Only the selected formula has a reasonable composition and excellent performance to ensure good scale and corrosion inhibition effect and ensure the normal operation of the system.

Scientifically and Rationally Add The Carbon Steel Corrosion Inhibitor

Different industries have different industry habits.

In the circulating cooling water treatment of petrochemical systems, steel systems, and chemical industries, the standard commercial pharmaceutical dosage is 50-80 mg/L (according to the water supply).

In the circulating cooling water treatment of the power industry, the standard commercial pharmaceutical dosage is 5-10 mg/L (according to the water supply).

In the water treatment chemicals of the power industry, if the formulation of the medicament is reasonable and the water quality is not very bad, the dosage is sufficient to solve the corrosion problem of copper and the general scale inhibition problem. But it is impossible to consider the corrosion inhibition of carbon steel.

Because the organophosphorus compound as a corrosion inhibitor has a certain corrosion inhibition effect on carbon steel only under the condition of high concentration of the agent. In order to ensure that it can function at a lower concentration, it is usually necessary to add about 2 mg/L of the cathode corrosion inhibitor Zn2+.

Therefore, in the power system, if the corrosion inhibition of carbon steel is to be considered, the cathode corrosion inhibitor zinc sulfate should be added.

The operating conditions of the circulating water systems of different thermal power plants vary. The causes of corrosion and scaling of copper pipes are also different. However, all should find the cause of the problem in a targeted manner, take effective measures, try to ensure the normal operation of the circulating water, thus ensuring the normal operation of the unit and truly saving power generation costs.

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01Nov 2019

Abstract: Maleic anhydride is used as raw material, sodium tungstate is used as catalyst, hydrogen peroxide is used as a cyclizing agent and Ca(OH)2 is used as an initiator. Polyepoxysuccinic acid (PESA) water treatment chemical was prepared by aqueous solution polymerization. PESA is a green, highly effective scale inhibitor. The optimal synthesis conditions were determined […]

31Oct 2019

Benzotriazole Corrosion Inhibitor Analysis in the Action Mechanism Abstract: This post introduces the properties and mechanism of benzotriazole corrosion inhibitors. The synergistic action of benzotriazole and imidazole better illustrates the progress of the sustained release. Combined with the corrosion example of copper in sodium chloride solution to illustrate the corrosion inhibition of triazole compounds. Keywords: […]

17Sep 2019

Abstract: A water-soluble copolymer scale inhibitor was synthesized from acrylic acid (AA) and 2-acryloyl-2-methyl propane sulfonic acid (AMPS). The scale inhibition and dispersion properties of the copolymer were determined. The effects of monomer ratio, reaction temperature and molecular weight modifier on the scale inhibition performance of the copolymer were investigated. Keywords: sulfonic acid, copolymer, scale […]

09Sep 2019

This article describes the commonly used experimental methods for assessing the biodegradability of polyacrylic acid polymers. It is recommended to use the carbon dioxide (PCD), oxygen consumption (COD) and infrared spectroscopy images of biodegradation to comprehensively analyze the biodegradability of polyacrylic acid polymers. The volume of the bioreactor is 2L, the concentration of the tested […]

23Aug 2019

2-Hydroxyphosphonoacetic acid is a good scale inhibitor. Its appearance is a dark brown liquid with a molecular formula of C2H5O6P and a relative molecular mass of 156.03. The preparation method generally has the following three methods. Method One 16.3 parts (0.11 mol/L) 50% aqueous solution of dihydroxyacetic acid (hydrated glyoxylic acid) and 8.2 parts (0.1 […]

30Jul 2019

Through the static scale inhibition test, we studied the scale inhibition performance of PBTC and HEDP on calcium carbonate scale under low-temperature conditions (2°C-15°C). The results show that the scale inhibition performance of PBTC and HEDP on calcium carbonate scale is good at 2°C-15°C. The initial calcium ion + alkalinity has a great influence on […]

27Jun 2019

The full name of DBNPA is 2-2-dibromo-3-nitriloproion amide. It is a broad-spectrum and efficient industrial fungicide. DBNPA is used to prevent bacteria and algae from growing in papermaking, industrial circulating cooling water, mechanical lubricants, pulp, wood, paint, and plywood. 2-2-Dibromo-3-Nitrilopropionamide (DBNPA) is currently popular at home and abroad. Organic bromine fungicides. Sterilization mechanism of DBNPA […]

26Jun 2019

1. The Introduction of Reverse Osmosis Chemicals The reverse osmosis chemical, IRASD-200 is a highly effective scale inhibitor developed for reverse osmosis (RO) systems. During the water treatment, dirt and iron scale are formed on the reverse osmosis membrane. They can degrade the performance of the water treatment system. Contaminants and deposits that accumulate on […]

25Jun 2019

2-mercaptobenzothiazole (MBT) is an important variety of thiazole rubber vulcanization accelerators. At the same time, it is also an important auxiliary agent for oxidation and corrosion resistance. 2-MBT is a pale yellow powder or granule. It has an unpleasant smell. The melting point is above 173.0°C. The relative density is 1.41 to 1.48. 2-mercaptobenzothiazole is […]

25Jun 2019

1. Active component (1-hydroxyethylidene-1 1-diphosphonic acid) content. 1.1 Oxidative decomposition method The active component of the finished product, 1-hydroxyethylidene-1 1-diphosphonic acid, and impurity phosphorous acid. Under appropriate oxidative decomposition conditions, both are converted to n-phosphonic acid. Then measure the data in a corresponding method. The total amount of n-phosphonate represents the amount of phosphinate which […]