Austenitic stainless steel polythionic acid stress corrosion preventing cleaning agent

A technology of polythionic acid and stress corrosion, which is applied in the field of anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent and cleaning agent, which can solve the problems of failure to find, equipment loss, threat to safety maintenance, etc., and achieve the effect of easy operation

Inactive Publication Date: 2018-08-24
南京高威表面技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of these dirt is likely to cause polythionic acid and the existing chloride ions to corrode austenitic stainless steel and cause stress corrosion cracking of the device, which seriously threatens safety maintenance and causes heavy equipment losses.
Those skilled in the art have always wanted to try a safe, environmentally friendly and easy-to-operate method to prevent the production of polythionic acid, but have not found a suitable solution. Therefore, there is an urgent need for a new solution to solve this technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent, the mass ratio of each component of anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent is as follows: carbonate 1%, amino carboxylate 2% %, polycarboxylate 2%, ethylene glycol 5%, sodium polyphosphate 2%, alkyl sulfate 3%, hydroxyethylidene diphosphate 0.8%, polyether modified polysiloxane 0.08%, water 84.12%.

[0025] The raw material of above-mentioned mass fraction is prepared into the polythionic acid cleaning agent of 5 tons, after diluting one time with water, evenly from volume is 102m 3 Spray on the top of the hydrogenation reactor, control the liquid level at the bottom of the reactor, and circulate and clean for 6 hours. The cleaning temperature is 20-40 ° C. The pH value of the cleaning solution is measured, and the results are as follows:

[0026] Cleaning time / h

[0027] After cleaning, the surface of the equipme...

Embodiment 2

[0028] Embodiment 2: An anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent, the mass ratio of each component of the anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent is as follows: carbonate 10%, aminocarboxylic acid Salt 7%, polycarboxylate 6%, ethylene glycol 8%, sodium polyphosphate 7%, alkyl sulfate 5%, hydroxyethylidene diphosphate 1%, polyether modified polysiloxane 0.5% , Water 55.5%.

[0029] The raw materials of the above mass fractions are prepared into 1 ton of polythionic acid cleaning agent, and added to a volume of 19m 3 In the high-pressure heat exchanger, add water to fill the heat exchanger. After soaking and passivating for 6 hours, the cleaning temperature is 20-40°C, and the pH value of the cleaning solution is measured. The results are as follows:

[0030] Cleaning time / h

[0031] After cleaning, the surface of the equipment was as clean as ever, and no cracks or other abnormalities w...

Embodiment 3

[0032] Embodiment 3: An anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent, the mass ratio of each component of the anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent is as follows: carbonate 5%, EDTA sodium salt 6 %, polycarboxylate 5%, ethylene glycol 8%, sodium polyphosphate 5%, alkyl sulfate 10%, hydroxyethylidene diphosphate 2.5%, polyether modified polysiloxane 0.1%, water 58.4%.

[0033] The raw material of above-mentioned mass fraction is prepared into the polythionic acid cleaning agent of 8 tons, is diluted with water evenly from volume to be 155m 3 The top of the hot high-pressure separator is sprayed, the liquid level at the bottom of the separator is controlled, and the cleaning is cycled for 6 hours at a cleaning temperature of 20-40°C. The pH value of the cleaning solution is measured, and the results are as follows:

[0034] Cleaning time / h

[0035] After cleaning, the surface of the equipme...

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PUM

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Abstract

The invention relates to an austenitic stainless steel polythionic acid stress corrosion preventing cleaning agent. The austenitic stainless steel polythionic acid stress corrosion preventing cleaningagent is characterized by comprising the following components including, by mass, 1%-12% of carbonate, 2%-10% of amino carboxylate, 1%-10% of polycarboxylate, 1%-15% of ethylene glycol, 1%-10% of sodium polyphosphate, 1%-15% of alkyl sulfate, 0.5%-2.9% of hydroxy ethylenediphosphate, 0.05%-1% of polyether modified polysiloxane and 55%-93% of water. According to the technical scheme, device stresscracking caused by corrosion of polythionic acid in a petrochemical plant on austenitic stainless steel is prevented, and the product is simple and convenient to operate, safe, efficient and environment-friendly.

Description

technical field [0001] The invention relates to a cleaning agent, in particular to an anti-austenitic stainless steel polythionic acid stress corrosion cleaning agent, which belongs to the technical field of passivating agents in petrochemical industry. Background technique [0002] After a period of production and operation of petrochemical plants using high-sulfur raw materials, a large amount of ferrous sulfide will be produced and adhere to equipment and pipelines with oil sludge and grease. The existence of these dirt is easy to produce polythionic acid and the existing chloride ions to corrode austenitic stainless steel and cause stress corrosion cracking of the device, which seriously threatens safety maintenance and causes heavy equipment losses. Those skilled in the art have always wanted to try a safe, environmentally friendly and easy-to-operate method to prevent the production of polythionic acid, but have not found a suitable solution. Therefore, a new solution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/26C23G1/18C23G1/19
CPCC23G1/26C23G1/18C23G1/19
Inventor 于利春
Owner 南京高威表面技术有限公司
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