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

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...

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 cracking of austenitic stainless steel

Furthermore, since the amount of dirt that needs to be cleaned in the device cannot be sampled and evaluated in advance, the determination of the amount of cleaning agent used is only based on empirical estimates. It will affect the consumption of cleaning agent. In most cases, the cleaning agent is exhausted and the cleaning end point cannot be reached, which seriously affects the cleaning quality.

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