Recycled three-in-one cleaning agent for ferrous sulfide passivation, sulfur-ammonia-amine deodorization and stress corrosion resistance of austenitic stainless steel polythionic acid

A technology of austenitic stainless steel and ferrous sulfide, applied in the direction of metal material coating process, etc., can solve the problems of inability to reach the cleaning end point, increase the corrosion rate of carbon steel, and exceed the standard of ammonia nitrogen in sewage, so as to overcome the risk of cleaning quality and save construction. The effect of less time and dosage

Active Publication Date: 2018-01-09
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

Ferrous sulfide passivation and deodorizer products on the market, the main components of which contain nitrogen compounds, chlorine compounds, and nitrogen compounds, and the use of such products will lead to severe ammonia nitrogen in the cleaned sewage; at the same time, The use of chlorine element compounds generates chloride ions in the solution, increasing the corrosion rate of carbon steel and causing stress corrosion crack

Method used

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  • Recycled three-in-one cleaning agent for ferrous sulfide passivation, sulfur-ammonia-amine deodorization and stress corrosion resistance of austenitic stainless steel polythionic acid
  • Recycled three-in-one cleaning agent for ferrous sulfide passivation, sulfur-ammonia-amine deodorization and stress corrosion resistance of austenitic stainless steel polythionic acid
  • Recycled three-in-one cleaning agent for ferrous sulfide passivation, sulfur-ammonia-amine deodorization and stress corrosion resistance of austenitic stainless steel polythionic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 910kg of water to the recycling device; add 5kg of polydimethylsiloxane to the water, stir to dissolve, and let stand; then add surfactant 10kg OP-10 and 5kg of LAS, stir to dissolve, let stand; then slowly add 5kg hydrogen peroxide, 20kg ferric sulfate, 10kg sodium bicarbonate, 10kg disodium EDTA, 5kg ethylenediaminetetramethylene phosphoric acid, 5kg sodium polyphosphate, 10kg polyacrylate sodium, 5kg ferric ammonium citrate, stir to dissolve, then adjust the obtained The pH of the solution was obtained to obtain 1 ton of three-in-one cleaning agent with a pH value of 8.2.

[0040] 1 ton of three-in-one cleaning agent prepared in Example 1 is diluted 10 times with water, and added to a volume of 50m 3 In the disulfide separation tank of the sweetening system, it has been detected that the disulfide separation tank contains ferrous sulfide and sulfide, which has a pungent smell. Start the cycle regeneration device to implement cycle cleaning, the cleaning time is ...

Embodiment 2

[0046] Add 1770kg of water to the recycling device; add 10kg of polydimethylsiloxane to the water, stir to dissolve, and let stand; then add surfactants 25kg OP-10 and 10kg of LAS, stir to dissolve, let stand; then slowly add 25kg hydrogen peroxide, 50kg iron sulfate, 20kg sodium bicarbonate, 20kg disodium EDTA, 15kg ethylenediaminetetramethylene phosphoric acid, 10kg sodium polyphosphate, 20kg polyacrylate sodium, 25kg ferric ammonium citrate, stirring and dissolving, and then The pH of the obtained solution was adjusted to obtain 2 tons of three-in-one cleaning agent with a pH value of 6.1.

[0047] The 2 tons of three-in-one cleaning agent that embodiment 2 is made dilutes 10 times with water, joins volume and is 75m 3 In the rich liquid flash tank of the desulfurization system, it has been detected that the rich liquid flash tank contains ferrous sulfide and ammonia liquid, and has an ammonia odor. Start the cycle regeneration device to implement cycle cleaning, the clean...

Embodiment 3

[0053] Add 1770kg of water to the recycling device; add 20kg of polydimethylsiloxane to the water, stir to dissolve, and let stand; then add surfactant 40kg OP-10 and 15kg of LAS, stir to dissolve, let stand; then slowly add 20kg hydrogen peroxide, 60kg ferric sulfate, 60kg sodium bicarbonate, 30kg disodium EDTA, 20kg ethylenediaminetetramethylene phosphoric acid, 20kg sodium polyphosphate, 30kg polyacrylate sodium, 30kg ferric ammonium citrate, stirring and dissolving, and then The pH of the obtained solution was adjusted to obtain 3 tons of three-in-one cleaning agent with a pH value of 9.4.

[0054] 3 tons of three-in-one cleaning agent that embodiment 3 is made dilutes 10 times with water, joins volume and is 150m 3 In the hot high-separation tank of the hydrogenation reaction system, it has been detected that the hot high-separation tank contains ferrous sulfide and polythionic acid. Start the cycle regeneration device to implement cycle cleaning, the cleaning time is 6h...

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Abstract

The invention provides a recycled three-in-one cleaning agent for ferrous sulfide passivation, sulfur-ammonia-amine deodorization and stress corrosion resistance of austenitic stainless steel polythionic acid. The three-in-one cleaning agent can be recycled, and comprises the following components in percentage by mass: 0.5-10.0% of oxidizing agent, 1.0-10.0% of carbonate, 1.0-10.0% of iron sulfate, 0.1-5.0% of EDTA sodium salt, 0.1-1.0% of ethylenediamine tetrahydrophosphate, 0.5-5.0% of sodium polyphosphate, 0.5-5.0% of polyacrylate, 0.5-5.0% of surface active agent, 0.1-1.0% of defoaming agent, 0.1-1.0% of ammonium ferric citrate, and 48.0-95.7% of water. The oxidizing agent is preferentially hydrogen peroxide; the carbonate is preferentially sodium bicarbonate; the surface active agentis preferentially OP-10 and LAS; and the PH value is controlled within 5.0-10.0. The three-in-one cleaning agent can remove the ferrous sulfide generated in a petrochemical plant to prevent spontaneous combustion caused by the ferrous sulfide, meanwhile, can remove the sulfur-ammonia-amine odor and prevent the stress cracking of the plant due to corrosion of austenitic stainless steel caused by generation of polythionic acid, and has such advantages as convenience in operation, low use level, low cost, safety, high efficiency and environmental protection.

Description

technical field [0001] The invention relates to the technical field of petrochemical cleaning, in particular to a three-in-one cleaning agent for the passivation of ferrous sulfide of recycling type, the deodorization of thiamine, and the anti-stress corrosion of austenitic stainless steel with polythionic acid. Background technique [0002] In the field of petrochemical industry, after a period of production and operation of the equipment using high-sulfur raw materials, a large amount of ferrous sulfide will be produced, which will adhere to the equipment and pipelines with oil sludge and dirt. The existence of these dirt can easily cause the spontaneous combustion of the equipment And produce harmful substances such as hydrogen sulfide and sulfur dioxide; it is also easy to produce polythionic acid, which corrodes austenitic stainless steel with the existing chloride ions and causes stress corrosion cracking of the device, which seriously threatens safety maintenance and c...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/04C23C22/23
Inventor 于利春
Owner 南京高威表面技术有限公司
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