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Composite corrosion and scale inhibitor and its application in water treatment

A technology of corrosion and scale inhibitor, scale inhibitor and dispersant, applied in water/sludge/sewage treatment, descaling and water softening, chemical instruments and methods, etc., to achieve good comprehensive performance, good corrosion inhibition performance, dosage less effect

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This research is aimed at copper materials, and it is operated without pH adjustment for high-hard and high-alkali water quality, only considering the corrosion situation

Method used

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  • Composite corrosion and scale inhibitor and its application in water treatment
  • Composite corrosion and scale inhibitor and its application in water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Take by weighing 12.0g sodium gluconate respectively, 66.9g sodium tetraborate pentahydrate, 60.0g solid content is 30% acrylic acid / hydroxypropyl acrylate / methyl acrylate (MA) copolymer (limit viscosity number is 0.078dl when 30 ℃ / g, AA / HPA / MA=60 / 20 / 20 (weight ratio, the same below)), the active ingredient is 50% 2-phosphonic acid group-1,2,4-butane tricarboxylate (PBTCA) 5.0g, add 56.1g of water and shake well to obtain 200.0g of the required preparation.

[0054] When the prepared medicament is added to test raw water 1 and test raw water 2, corrosion inhibition test water 1 (adjust the pH value to 7.9 with sulfuric acid) and test water 2 at a concentration of 200 mg / L, the sodium gluconate, five The effective concentrations of sodium tetraborate hydrate, PBTCA, and acrylic acid / hydroxypropyl acrylate / methyl acrylate copolymer were 12 mg / L, 35 mg / L, 2.5 mg / L, and 18 mg / L, respectively.

Embodiment 2

[0056] Take by weighing 30.5g anhydrous sodium metasilicate, 55.0g sodium gluconate, 33.3g 30% acrylic acid / 2-methyl-2'-acrylamidopropanesulfonic acid binary copolymer (at 30 DEG C, the limiting viscosity is 0.074dl / g, AA / AMPS=70 / 30), the active ingredient is 50% HEDP7.0g, add to 74.2g water, shake well, promptly obtain the required preparation 200.0g medicine solution.

[0057] When the prepared chemical solution is added to the test raw water 1 and the corrosion inhibition test water 1 (with sulfuric acid to adjust the pH value to 8.0) at a concentration of 200mg / L, the anhydrous sodium metasilicate, sodium gluconate, HEDP The effective concentrations of acrylic acid / 2-methyl-2'-acrylamidopropanesulfonic acid binary copolymer are 15mg / L, 55mg / L, 3.5mg / L and 10mg / L, respectively.

Embodiment 3

[0059] Take by weighing 36.9g sodium tetraborate decahydrate, 194.1g sodium metasilicate pentahydrate, 13.3g 30% methyl acrylate / styrene sulfonic acid copolymer (limited viscosity number is 0.074dl / g when 30 ℃, MA / benzene Ethylene sulfonic acid=80 / 20), the active ingredient is 7.0 g of 50% glycine dimethylphosphonic acid, added to 148.7 g of water, and shaken up to obtain 400.0 g of the medicament solution to be prepared.

[0060] When the prepared chemical solution is added to the test raw water 1 and the corrosion inhibition test water 1 (with sulfuric acid to adjust the pH value to 8.1) at a concentration of 400mg / L, the sodium tetraborate decahydrate and sodium metasilicate pentahydrate in the water will The effective concentrations of glycine dimethylene phosphonic acid and methyl acrylate / styrene sulfonic acid copolymer are 15mg / L, 55mg / L, 3.5mg / L and 4mg / L, respectively.

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Abstract

The invention relates to a composite corrosion and scale inhibitor and application thereof. The composite corrosion and scale inhibitor comprises a) two different salts selected from the group consisting of water-soluble borate, water-soluble gluconate and water-soluble silicate, b) at least one organic phosphonic acid and c) at least one scale inhibition and dispersion agent, wherein the scale inhibition and dispersion agent is a polymer containing carboxylic groups. The composite corrosion and scale inhibitor provided in the invention has good comprehensive performance, an excellent effect on inhibiting CaCO3 scale, strong capability in stabilizing Zn<2+> in water and good corrosion inhibition, is applicable to treatment of circulating cooling water and uses a small amount of organic phosphonic acid, thereby reducing harm to environment caused by discharge of phosphorus.

Description

technical field [0001] The invention relates to a composite scale and corrosion inhibitor and its application, in particular to a composite corrosion and scale inhibitor and its application in circulating cooling water treatment. Background technique [0002] Corrosion inhibition, scale inhibition and microbial control are the three major problems to be solved in circulating water treatment. Microbial control is achieved by adding fungicides, and corrosion and scale inhibition is solved by compound scale and corrosion inhibitor formula. The problems to be solved by composite scale and corrosion inhibitors are different for different water qualities. For low-hardness and low-alkali water quality, the natural pH value operation process is adopted, and the water treatment formula focuses on solving the problem of corrosion inhibition. Generally, phosphate + organic phosphine + sulfonic acid is used Salt copolymer + zinc salt formula. For high hardness and high alkali water qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14
CPCC23F11/08C23F14/02
Inventor 郦和生秦会敏楼琼慧李博伟张春原
Owner CHINA PETROLEUM & CHEM CORP
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