Composite corrosion and scale inhibitor containing zinc salt and application thereof and method for inhibiting corrosion of sulfur-containing circulating cooling water

A technology of corrosion and scale inhibitor and circulating cooling water, used in composite corrosion and scale inhibitor to inhibit the corrosion of sulfur-containing circulating cooling water, can solve the problem of reducing operating costs, large consumption of fresh water, and large amount of corrosion and scale inhibitor. and other problems to achieve the effect of reducing operating costs and inhibiting corrosion

Inactive 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 A compound cor...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 0.5 mg / L, and obtain test water. Add sodium carbonate to adjust the pH value to 8.2, and then add 350mg / L composite corrosion and scale inhibitor. , purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below): a copolymer of acrylic acid and 2-methyl-2'-acrylamidopropanesulfonic acid (the molar percentages of the two monomers are respectively 70% and 30%, Intrinsic viscosity is 0.071dL / g, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below): urotropine=1:4:7:150 (weight ratio). Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.041mm / a, and the scale inhibition rate was 99.0%.

Embodiment 2

[0054] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 0.5 mg / L, and obtain test water. Add sodium hydroxide to adjust the pH value to 8.5, and then add 320mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: zinc chloride (calculated as zinc ion):HPMA:acrylic acid, propylene Copolymer of amide and 2-methyl-2'-acrylamidopropanesulfonic acid (the molar percentages of the three monomers are 70%, 15% and 15% respectively, and the intrinsic viscosity is 0.068dL / g, purchased from Shandong Taihe Water Co., Ltd. Processing Technology Co., Ltd., the same below): urotropine=1:3.2:4.5:130 (weight ratio). Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.050mm / a, and the scale inhibition rate was 98.9%.

Embodiment 3

[0056] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 0.5 mg / L, and obtain test water. Add sodium hydroxide and sodium carbonate to adjust the pH value to 8.8, and then add 480mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: zinc sulfate (calculated as zinc ions): HPMA: acrylic acid , hydroxypropyl acrylate and 2-methyl-2'-acrylamido propane sulfonic acid (the molar percentages of the three monomers are 70%, 15% and 15% respectively, and the intrinsic viscosity is 0.070dL / g, purchased From Shandong Taihe Water Treatment Technology Co., Ltd): urotropine=1:5.8:8:240 (weight ratio). Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.040mm / a, and the scale inhibition rate was 99.2%.

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Abstract

The invention relates to the field of corrosion of sulfur-containing circulating cooling water, and discloses a composite corrosion and scale inhibitor containing a zinc salt and an application thereof and a method for inhibiting corrosion of sulfur-containing circulating cooling water. The composite corrosion and scale inhibitor contains the zinc salt, hydrolyzed polymaleic anhydride, a sulfonatecopolymer and urotropine, wherein a weight ratio ofthe zinc saltto the hydrolyzed polymaleic anhydrideto the sulfonate copolymer tourotropine is 1:3-6:4-10:125-250, and the weight of the zinc salt iscalculated by zinc ions. According to the method provided by the invention, the pH value of the sulfur-containing circulating cooling water is adjusted to 8-9, and then the composite corrosion and scale inhibitor is used, so that the relatively good corrosion and scale inhibition effects can be obtained. The method can effectively inhibit corrosion of water-coolingequipment by sulfides in the sulfur-containing circulating cooling water without using a large amount of chemicals and fresh water, and the operating cost can be effectively reduced.

Description

technical field [0001] The invention relates to the field of sulfur-containing circulating cooling water corrosion, in particular to a composite corrosion and scale inhibitor containing zinc salt, its application and a method for inhibiting the corrosion of sulfur-containing circulating cooling water. 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 the circulating cooling water. especially H...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/12C02F103/36
CPCC02F5/105C02F5/125C02F2103/365C02F2303/08C23F11/08C23F14/02
Inventor 楼琼慧郦和生秦会敏谢文州王洪英
Owner CHINA PETROLEUM & CHEM CORP
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