Method for restraining corrosion by circulating cooling water of containing sulphur

A circulating cooling water and circulating water technology, which is applied in the field of inhibiting the corrosion of sulfur-containing circulating cooling water, can solve the problems of inability to meet the requirements of industrial production, waste of water resources and water treatment agents, etc., and achieve the effect of low treatment cost and simple operation

Active Publication Date: 2007-05-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these measures can achieve a certain corrosion inhibition effect, they still cannot meet the requirements of industrial production and cause waste of water resources and water treatment agents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment adopts 20 # Carry out the corrosion test of the rotating coupon on carbon steel, refer to HG / T2159-91, the test temperature is 50 ℃, the speed is 75 rpm, and the operation is 72 hours.

[0019] Water quality in a refinery: calcium hard 85mg / L, total alkalinity 80mg / L, Cl - 40mg / L, SO 4 2- 30mg / L,, S 2- 0.5mg / L, use NaHCO without changing the current chemicals used in the refinery 3 Adjust the alkalinity to 300mg / L, and add different concentrations of composite corrosion inhibitors (4% hydroxyethylidene diphosphonic acid, 12% hydroxyphosphinoacetic acid, 17% binary copolymer of acrylic acid and AMPS, 5% zinc chloride, 63% deionized water). The results are shown in Table 1.

[0020] Test serial number

Embodiment 2

[0022] This example is a corrosion test on a rotating coupon, which is carried out with reference to HG / T2159-91.

[0023] Water quality in an oil refinery: calcium hardness 170mg / L, total alkalinity 160mg / L, Cl - 60mg / L, SO 4 2- 60mg / L, S 2- 1mg / L, the current corrosion rate of rotating coupons for circulating water in refineries is 0.134mm / a. Adding NaHCO to the test water without changing the chemicals currently used in the refinery 3 Adjust the alkalinity to 320mg / L, then add 20mg / L compound corrosion inhibitor (4% ethylenediamine tetramethylene phosphonic acid, 8% polyol phosphate, 12% polyepoxysuccinic acid, 8% acrylic acid and 2- Acrylamido-2-methyl-propanesulfonic acid and maleic anhydride terpolymer, 8% zinc nitrate, 56% deionized water), the corrosion rate of the rotating coupon is reduced to 0.021mm / a.

Embodiment 3

[0025] This example shows that the corrosion inhibition effect achieved by increasing the amount of the original corrosion inhibitor is not as good as the corrosion inhibition effect after the treatment according to the present invention.

[0026] This example is a corrosion test on a rotating coupon, which is carried out with reference to HG / T2159-91.

[0027] Test water quality is the same as embodiment 2. At present, the corrosion rate of the rotating coupon in the circulating water of the refinery is 0.134mm / a. If the dosage of the original chemical is increased by 25mg / L, the corrosion rate of the rotating coupon is 0.098mm / a.

[0028] According to the inventive method, add NaHCO in test water 3 , adjust the alkalinity to 250mg / L, and then add 20mg / L composite corrosion inhibitor (8% aminotrimethylene phosphonic acid, 6% polyol phosphate, 4% sodium molybdate, 20% acrylic acid and AMPS binary copolymerization substance, 10% zinc chloride), the corrosion rate of the rotat...

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Abstract

This invention provides a method for inhibiting the corrosion of sulfur-containing circulating cooling water. The method comprises: controlling the alkalinity of sulfur-containing circulating cooling water at 250-350 mg/L, and adding composite corrosion inhibitor 5-40 times of leaked sulfur ions in sulfur-containing circulating cooling water. The composite corrosion inhibitor comprises: organic corrosion inhibitor (one or more of hydroxyethylidene-1,1-diphosphonic acid, hydroxyphosphonoacetic acid, aminotrimethylene phosphonic acid, ethylene diamine tetramethylene phosphonic acid, 2-phosphono-1,2,4-tricarboxylic acid-butane and its potassium salt or sodium salt, polyol phosphate, and polyether alcohol amine phosphate) 2-24 wt.% and water 76-98 wt.%. The method has obvious effect on treating sulfur-containing circulating cooling water without changing the reagents used, and can control leaked sulfur ion concentration to 2mg/L and carbon steel corrosion rate to below 0.075 mm/a.

Description

technical field [0001] The invention relates to a method for inhibiting corrosion of sulfur-containing circulating cooling water, specifically, a method for inhibiting corrosion of sulfur-containing circulating cooling water to metals in a circulating water system. Background technique [0002] In recent years, the proportion of high-sulfur crude oil processed by various refineries has increased rapidly year by year. High-sulfur crude oil severely corrodes the processing equipment, causing sulfur-containing materials to enter the circulating water, resulting in deterioration of water quality, accelerating equipment corrosion and scaling, and bringing serious hidden dangers to the safety, high efficiency, and long-term operation of production equipment. Service life of water pipelines. Material leakage occurred in the circulating water system of a refinery processing high-sulfur crude oil, and the sulfide in the circulating water increased sharply from 0.05mg / L to 0.4-0.7mg / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/00C23F11/06C23F11/10
Inventor 傅晓萍李本高
Owner CHINA PETROLEUM & CHEM CORP
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