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 inhibitor, circulating cooling water, applied in descaling and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc. Advanced problems, to achieve the effect of inhibiting corrosion and reducing operating costs

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L to obtain test water. Dosing 28mg / L composite corrosion and scale inhibitor, the composition of the composite corrosion and scale inhibitor is: zinc sulfate (calculated as zinc ion):HEDP:HPAA:acrylic acid and 2-methyl-2'-acrylamidopropane Copolymer of sulfonic 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., the same below)=1:3:3:6 (weight ratio); then, add the compound of ferric chloride and nitrilotriacetic acid, wherein, ferric chloride (in terms of ferric ion): nitrilotriacetic acid=1:4.5 (weight ratio), Make the concentration of ferric ion in water be 1.6mg / L. Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.032mm / a, and the scale inhibition rate was 98.3%.

Embodiment 2

[0056] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Dosing 33mg / L composite corrosion and scale inhibitor, the composition of the composite corrosion and scale inhibitor is: zinc chloride (calculated as zinc ion):HEDP:HPAA:acrylic acid, acrylamide and 2-methyl-2'- Copolymer of 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 Treatment Technology Co., Ltd.) = 1:2.7 :3.8:8.8 (weight ratio); Then, add the compound of ferric sulfate and nitrilotriacetic acid, wherein, ferric sulfate (calculated as ferric ion): nitrilotriacetic acid=1:3.2 (weight ratio ), so that the concentration of ferric ion in water is 1.7mg / L. Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.035mm / a, and the scale inhibition rate was ...

Embodiment 3

[0058] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Dosing 22mg / L composite corrosion and scale inhibitor, the composition of the composite corrosion and scale inhibitor is: zinc sulfate (calculated as zinc ion):HEDP:HPAA:acrylic acid, hydroxypropyl acrylate and 2-methyl-2' -copolymer of acrylamidopropanesulfonic acid (the molar percentages of the three monomers are respectively 70%, 15% and 15%, and the intrinsic viscosity is 0.070dL / g, purchased from Shandong Taihe Water Treatment Technology Co., Ltd.)=1: 3.8:2.7:4.2 (weight ratio); Then, add the compound of ferric nitrate and nitrilotriacetic acid, wherein, ferric nitrate (calculated as ferric ion): nitrilotriacetic acid=1:5.8 (weight Ratio), so that the concentration of ferric ion in water is 1.8mg / L. Rotating coupon corrosion test and calcium carbonate scale inhibition test were carried out, the corrosion rate was 0.050mm / a, and the scale inhibition ra...

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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 and an application thereof and a method for inhibiting corrosion of sulfur-containing circulating cooling water. The composite corrosion and scale inhibitor contains a zinc salt, hydroxyethylidene diphosphonic acid, 2-hydroxyphosphonoacetic acid and a sulfonate copolymer, wherein a weight ratio ofthe zinc saltto hydroxyethylidene diphosphonic acidto 2-hydroxyphosphonoacetic acid tothe sulfonate copolymer is 1:2.5-4:2.5-4:4-9, and the weight ofthe zinc salt is calculated by zinc ions. According to the method provided by the invention, the composite corrosion and scale inhibitor and a complex of a ferric salt and nitrilotriacetic acid are used in combination to obtain relatively good corrosion and scale inhibition effects. 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 and 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 2 After S gas en...

Claims

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Application Information

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IPC IPC(8): C02F5/14
CPCC02F5/145C02F2303/08C02F2303/22
Inventor 郦和生楼琼慧谢文州秦会敏王洪英
Owner CHINA PETROLEUM & CHEM CORP
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