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

A technology of corrosion and scale inhibitors and circulating cooling water, which is applied in the fields of descaling and water softening, chemical instruments and methods, complexes/solubilizers, etc. The problem of large amount of scale agent is eliminated, and the effect of reducing operating cost and inhibiting corrosion is achieved.

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 A compound corrosion and scale inhibitor containing urotropine and a method for inhibiting corrosion of sulfur-containing circulating cooling water, the method can effectively inhibit the corrosion of water-cooling equipment by sulfide in sulfur-containing circulating cooling water without using a large amount of chemicals and fresh water, and can effectively Reduce operating costs

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 400mg / L composite corrosion and scale inhibitor. -copolymer of methyl-2'-acrylamidopropanesulfonic acid (the molar percentages of the two monomers are 70% and 30% respectively, and the intrinsic viscosity is 0.071dL / g, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., Same below): urotropine=1:4:4:7:150 (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 98.7%.

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 ions):HEDP:HPAA:acrylic acid , acrylamide and 2-methyl-2'-acrylamidopropanesulfonic acid copolymer (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 Treatment Technology Co., Ltd., the same below): urotropine=1:2.2:4.8:4.5:130 (weight ratio). Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.045mm / a, and the scale inhibition rate was 99.2%.

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):HEDP:HPAA : Copolymer of acrylic acid, hydroxypropyl acrylate and 2-methyl-2'-acrylamidopropanesulfonic acid (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.): urotropine=1:4.8:2.2:8:240 (weight ratio). Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.039mm / a, and the scale inhibition rate was 99.0%.

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Abstract

The invention relates to the field of corrosion of sulfur-containing circulating cooling water, and discloses an urotropine-containing composite corrosion and scale inhibitor, an application thereof and a method for inhibiting corrosion of sulfur-containing circulating cooling water. The composite corrosion and scale inhibitor comprises a zinc salt, hydroxyethylidene diphosphonic acid, 2-hydroxyphosphonoacetic acid, a sulfonate copolymer and urotropine, wherein the weight ratio of the zinc salt to the hydroxyethylidene diphosphonic acid to the 2-hydroxyphosphonoacetic acid to the sulfonate copolymer to the urotropine is 1:(2-5):(2-5):(4-10):(125-250), wherein the weight of the zinc salt is based on zinc ions. According to the method provided by the invention, after the pH value of the sulfur-containing circulating cooling water is adjusted to be 8-9, the composite corrosion and scale inhibitor can be used, and a good corrosion and scale inhibition effect can be obtained. According to the method, corrosion of sulfides in the sulfur-containing circulating cooling water to water cooling equipment can be effectively inhibited without using a large amount of reagents and fresh water, and operation 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 compound corrosion and scale inhibitor containing urotropine, 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): C02F5/14C02F5/12C02F5/08C02F5/10C02F103/36
CPCC02F5/145C02F2103/365C02F2303/08C23F11/08C23F14/02
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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