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Highly effective ferrous sulfide deactivation cleaning agent

A ferrous sulfide and cleaning agent technology, which is applied in the direction of detergent compounding agent, detergent composition, surface active detergent composition, etc., can solve problems such as a large number of free oxygen, explosion, and life safety hazards of on-site workers, and achieve prevention Effects of spontaneous combustion accidents

Active Publication Date: 2008-09-03
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The use of passivation cleaning agents containing sodium hypochlorite can easily generate other toxic and harmful by-products (such as mustard gas) during the cleaning process, causing serious harm to the life safety of on-site workers
However, hydrogen peroxide and other oxidants react with ferrous sulfide to release heat, and a large amount of free oxygen will be generated, and an explosion accident will occur if the control is not proper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0010] Weigh 10.0g of sodium dodecylbenzenesulfonate, 8.0g of fatty alcohol and ethylene oxide condensate and 6.0g of alkylphenol and ethylene oxide condensate (OP-10), add 800g of water, and stir to dissolve. Weigh 10.0 g of chlorine dioxide powder and add it into the above solution, stir to dissolve, and control the pH value of the solution at 5.5-6.5. Then add 1.0g citric acid, 1.0g EDTA and 1.0g hexamethylenetetramine corrosion inhibitor, stir to dissolve, add water to make up to 1000g, and continue to stir until the solution is clear and transparent. Take 50 g of the passivation cleaning agent prepared above, add 0.5 g of ferrous sulfide powder (400 mesh), keep it in a water bath at 50° C. for reaction, and regularly measure the concentration of iron ions in the solution. As a result, after the reaction was carried out for 6 hours, the concentration of iron ions in the solution remained basically unchanged, indicating that the passivation of ferrous sulfide had been compl...

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PUM

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Abstract

A highly efficient inactivating detergent for ferrous sulfide is disclosed, which is characterized by that it comprises 0.1-10% of chlorine dioxide, 0.1-10% of surfactant, 0.1-5% of citric acid, 0.1-5% of EDTA, 0.1-5% of corrosion inhibitor and water. The surfactant is one or more from dodecyl sulphonate, dodecyl benzene sulfonate, condensate of alkyl phenol and epoxyethane and condensate of aliphatic alcohol and epoxyethane. The corrosion inhibitor is urotropine, dibutyl thiourea or alkyl pyridine. Using the inventive inactivating detergent in cleaning petroleum refining apparatus, ferrous can be thoroughly oxygenized, inactivated and sulfated on one aspect, to prevent occurrence of self-ignition accident, oil crust can be totally washed from the apparatus on the other aspect, which makes the invention has characteristics of high efficiency, secure and environmental protective.

Description

technical field [0001] The invention relates to a passivation cleaning agent for cleaning ferrous sulfide scale deposited on petrochemical equipment. Background technique [0002] In the refining process of petroleum, especially high-sulfur crude oil, such as vacuum distillation, catalytic cracking, hydrocracking, coking, hydrofinishing, gas separation or desulfurization, a large amount of ferrous sulfide will be produced, which adheres to the refining unit within the pipeline. The accumulation of a large amount of ferrous sulfide scale in the production device will seriously affect its normal operation and efficiency, and the device must be shut down for maintenance regularly. During the maintenance process, when ferrous sulfide encounters air, it is very easy to spontaneously ignite and cause fire and explosion accidents, which seriously affects the long-term safe operation of petrochemical equipment and poses a great threat to the safety of petrochemical enterprises. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/30C11D1/00C11D3/20C11D3/04
Inventor 肖安山邹兵姜素霞谢传欣牟善军
Owner CHINA PETROLEUM & CHEM CORP
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