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Polyphosphate-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 inhibitor and circulating cooling water, which is used in composite corrosion and scale inhibitor to inhibit the corrosion of low-hardness, low-alkali and sulfur-containing circulating cooling water, and can solve the problem of large consumption of fresh water and large amount of corrosion and scale inhibitor. , high operating costs, to achieve the effect of reducing operating costs and inhibiting corrosion

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 containing polyphosphate and its application in inhibiting corrosion of sulfur-containing circulating cooling water, and a method for inhibiting corrosion of sulfur-containing circulating cooling water, the concentration of calcium ions in the sulfur-containing circulating cooling water is 50- 180mg / L, total alkalinity 50-180mg / L, in which calcium ion concentration and total alkalinity are calculated as calcium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 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 25mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: three Sodium polyphosphate: HEDP+PBTCA: AA / AMPS / HPA (the molar percentages of 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): T-225 (the percentages of the two monomers of acrylic acid and hydroxypropyl acrylate are 80% and 20% respectively, and the limiting viscosity is 0.071dL / g, purchased from Shandong Taihe Water Treatment Technology Co., Ltd., the same below) =1:1.5:2:2 (weight ratio), wherein, the weight ratio of HEDP and PBTCA is 5:5, carry out rotating coupon corrosion test ...

Embodiment 2

[0061] Take test raw water 1, add sodium sulfide to make the concentration of sulfide ions 1 mg / L, and obtain test water. Add potassium carbonate to adjust the pH value to 9.7, add calcium chloride to make the calcium ion concentration reach 210mg / L, and then add 20mg / L composite corrosion and scale inhibitor. The composition of the composite corrosion and scale inhibitor is: six Sodium metaphosphate: HEDP+HPAA:AA / AMPS / HPA:T-225=1:1.3:1.7:2.8 (weight ratio), wherein, the weight ratio of HEDP and HPAA is 5:5, carries out rotating coupon corrosion test and Calcium carbonate scale inhibition test, the corrosion rate is 0.035mm / a, and the scale inhibition rate is 99.9%.

Embodiment 3

[0063] 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 and potassium hydroxide to adjust the pH value to 9.6, add calcium chloride to make the calcium ion concentration reach 290mg / L, and then add 28mg / L composite corrosion and scale inhibitor. It is composed of: sodium tripolyphosphate: HPAA+PBTCA:AA / AMPS / HPA:T-225=1:1.7:2.8:1.7 (weight ratio), wherein, the weight ratio of HPAA and PBTCA is 4:6, and the rotation hanging Sheet corrosion test and calcium carbonate scale inhibition test, the corrosion rate is 0.030mm / a, and the scale inhibition rate is 99.9%.

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Abstract

The invention relates to the field of sulfur-containing circulating cooling water corrosion, and discloses a polyphosphate-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 contains polyphosphates, organic phosphonic acid, a copolymer of acrylicacid, 2-acrylamido-2-methylpropanesulfonic acid and hydroxypropyl acrylate and a copolymer of acrylic acid and hydroxypropyl acrylate, wherein the weight ratio of the polyphosphates to the organic phosphonic acid to the copolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and hydroxypropyl acrylate to the copolymer of acrylic acid and hydroxypropyl acrylate is 1:(1.2-1.8):(1.5-3):(1.5-3). The method provided by the invention is more suitable for low-hardness low-alkali sulfur-containing circulating cooling water after the pH value of sulfur-containing circulating cooling wateris adjusted to be 9.5-10 and the concentration of calcium ions is adjusted to be 200-300 mg / L, and a good corrosion and scale inhibition effect can be obtained. Through 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.

Description

technical field [0001] The invention relates to the field of sulfur-containing circulating cooling water corrosion, in particular to a polyphosphate-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. 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 circulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/14C02F103/36
CPCC02F5/105C02F5/145C02F2103/365C02F2303/08C23F11/08C23F14/02
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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