Ferrous sulfide passivation cleaning agent and preparation method and application thereof

A ferrous sulfide and cleaning agent technology, applied in the petrochemical field, can solve the problems of sodium hypochlorite easily producing harmful substances, stainless steel pitting, equipment corrosion, etc., and achieve the effects of low price, fast action and good safety

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of potassium permanganate contains a large amount of manganese ions in the passivation cleaning solution, which is easy to cause secondary pollution; chlorine dioxide is corrosive to equipment, especially prone to pitting corrosion on stainless steel; pickling is more serious to the corrosion of equipment, Although corrosion inhibitors are added to reduce corrosion, the waste liquid after cleaning still needs to be resolved; sodium hypochlorite is prone to produce harmful substances

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The present invention also provides the preparation method of above-mentioned ferrous sulfide passivation cleaning agent, comprising:

[0036] The first step is to take part of the water, add the surfactant in proportion to the water, stir to dissolve, and let stand;

[0037] In the second step, add potassium ferrate, sodium hypochlorite, tetrasodium EDTA and sodium bicarbonate in proportion to the solution obtained in the first step, stir and dissolve, continue to add water to the required amount, and adjust the pH value at 10 Between ~11, continue stirring to obtain the passivation cleaning agent.

[0038] The present invention also provides the application of the ferrous sulfide passivation cleaning agent in the cleaning process of petrochemical equipment.

Embodiment 1

[0040] The preparation of embodiment 1 passivation cleaning agent

[0041] Take by weighing 15g sodium dodecylbenzenesulfonate, 10g sodium dodecyl sulfate, 5g alkylphenol polyoxyethylene ether (OP-10), 8g fatty alcohol polyoxyethylene ether as surfactant, add 800g water , stirring, dissolving, and standing. Then add 10g potassium ferrate, 50g sodium hypochlorite, 5g ethylenediaminetetraacetic acid-tetrasodium (EDTA-tetrasodium), 10g sodium bicarbonate to the above solution, stir and dissolve, add water to 1000g, make its pH value 10, and Stirring is continued to dissolve the solute to obtain a passivation cleaning agent.

Embodiment 2

[0042] Embodiment 2 passivation cleaning agent cleans ferrous sulfide experimental comparison

[0043] The cleaning effect of the ferrous sulfide residue before and after cleaning was compared and verified by using a reactor that reacts with water to release gas.

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Abstract

The invention discloses a ferrous sulfide passivation cleaning agent which comprises sodium bicarbonate, sodium hypochlorite, ethylene diamine tetraacetic acid-tetrasodium (EDTA-tetrasodium), potassium ferrate, surfactant and water. The passivation cleaning agent provided by the invention is safe, efficient, environment-friendly and low in price and can absorb harmful gases; the component potassium ferrate is bactericidal and environment-friendly and is a novel efficient multifunctional passivation treating agent integrating oxidation, adsorption, flocculation, coagulant aid, sterilization, insect killing and deodorization; and the component potassium ferrate has the advantages of good sterilization effect, little dosage, fast effect, multiple functions, high safety and the like, and is convenient to use and widely applicable.

Description

technical field [0001] The invention belongs to the field of petrochemical technology, and in particular relates to a ferrous sulfide passivation cleaning agent for preventing ferrous sulfide spontaneous combustion in petrochemical equipment. Background technique [0002] The spontaneous combustion of ferrous sulfide in petrochemical equipment (especially refining and chemical equipment) mainly occurs during the maintenance process. When the equipment is opened for maintenance, the ferrous sulfide dirt attached to the surface of the equipment contacts with the air, and the ferrous sulfide and oxygen in the air generate Chemical reaction, resulting in spontaneous combustion. At present, there are three ways to prevent the spontaneous combustion of ferrous sulfide in industry: [0003] 1. Isolation method: to prevent contact between ferrous sulfide and oxygen in the air, such as nitrogen protection, water seal protection, etc.; [0004] 2. Cleaning method: remove ferrous sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/14
Inventor 孟庭宇张淑娟王振刚郑俊鹤石宁谢传欣吕红波徐伟姜杰孙峰
Owner CHINA PETROLEUM & CHEM CORP
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