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Polycarboxylic acid containing composite corrosion and scale inhibitor and application thereof and method for inhibiting corrosion of sulfur-containing circulating cooling water

A technology of corrosion and scale inhibitors and circulating cooling water, applied in the field of inhibiting corrosion of low-hardness, low-alkali and sulfur-containing circulating cooling water systems, composite corrosion and scale inhibitors, can solve the problems of large fresh water consumption, high operating costs, corrosion inhibition The problem of large amount of scale inhibitor is used to achieve the effect of inhibiting corrosion and reducing operating costs

Active Publication Date: 2020-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of the prior art in the process of inhibiting the corrosion of sulfur-containing circulating cooling water, such as the large amount of corrosion and scale inhibitors, the large consumption of fresh water, the large amount of sewage, and the high operating costs, and to provide a new Composite corrosion and scale inhibitor and its application in inhibiting corrosion of sulfur-containing circulating cooling water, and a method for inhibiting corrosion of sulfur-containing circulating cooling water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Add sodium carbonate to adjust the pH value to 9.8, add calcium chloride to make the calcium ion concentration reach 250mg / L, and then add 40mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: hydrolysis Polymaleic anhydride (the weight-average molecular weight is 700, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below) + polyepoxysuccinic acid (the weight-average molecular weight is 1000, purchased from Shandong Taihe Water Treatment Technology Co., Ltd. , the same below): AA / AMPS / HPA (the molar percentages of the three monomers are 70%, 15% and 15% respectively, and the limiting viscosity is 0.070dL / g, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below) : sodium orthosilicate (calculated as silicon dioxide)=1:1.5:4 (weight ratio), w...

Embodiment 2

[0060] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Add sodium carbonate to adjust the pH value to 9.7, add calcium chloride to make the calcium ion concentration reach 210mg / L, and then add 36mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: hydrolysis Polymaleic anhydride (the weight-average molecular weight is 700, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below)+polyacrylic acid (the weight-average molecular weight is 3000, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below): AA / AMPS / HPA: sodium metasilicate (calculated as silicon dioxide) = 1:1.2:3.2 (weight ratio), wherein the weight ratio of hydrolyzed polymaleic anhydride to polyacrylic acid is 5:5. Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.031mm / a...

Embodiment 3

[0062] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Add sodium carbonate to adjust the pH value to 9.6, add calcium chloride to make the calcium ion concentration reach 290mg / L, and then add 43mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: Acrylic acid+polyepoxysuccinic acid: AA / AMPS / HPA: potassium orthosilicate (calculated as silicon dioxide)=1:1.8:4.8 (weight ratio), wherein, the weight ratio of polyacrylic acid and polyepoxysuccinic acid is 6:4. Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.033mm / a, and the scale inhibition rate was 100%.

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Abstract

The invention relates to the field of sulfur-containing circulating cooling water corrosion and discloses a polycarboxylic acid containing composite corrosion and scale inhibitor and application thereof and a method for inhibiting corrosion of sulfur-containing circulating cooling water. The composite corrosion and scale inhibitor comprises polycarboxylic acid, a copolymer of acrylic acid, 2-acrylamide-2-methallyl sulfonate and hydroxypropyl acrylate, as well as a silicate, wherein the weight ratio of the polycarboxylic acid to the copolymer of acrylic acid, 2-acrylamide-2-methallyl sulfonateand hydroxypropyl acrylate to the silicate is 1:(1-2):(3-5); and the weight of the silicate is measured by silica. The method provided by the invention is applicable to low-hardness low-alkali circulating cooling water after the pH value of the sulfur-containing circulating cooling water is adjusted to 9.5-10 and the calcium concentration is 200-300mg / L, and has a good corrosion and scale inhibition effect. By adopting the method, corrosion of sulfides in the sulfur-containing circulating cooling water to water cooling equipment can be effectively inhibited without using a great amount of reagents or fresh water.

Description

technical field [0001] The invention relates to the field of sulfur-containing circulating cooling water corrosion, in particular to a polycarboxylic acid-containing composite corrosion and scale inhibitor and its application and a method for inhibiting corrosion of low-hardness and low-alkali sulfur-containing circulating cooling water systems. Background technique [0002] In recent years, the processing of highly corrosive high-sulfur crude oil in refining units will cause corrosion and perforation of equipment, and leakage of materials into circulating water will occur. Sulfides in crude oil can be divided into inorganic sulfur and organic sulfur. Organic sulfur includes mercaptans, sulfides, disulfides, polysulfides, cyclic sulfides, and thiophenes. 2 S. These substances can directly corrode the metal. If the corrosion perforation causes material leakage, the leaked material will enter the circulating cooling water, causing serious deterioration of the water quality of...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/12
CPCC02F5/10C02F5/12
Inventor 楼琼慧郦和生秦会敏谢文州王洪英
Owner CHINA PETROLEUM & CHEM CORP