Chemical cleaning agent for clearing impurities such as ferrous sulfide

A ferrous sulfide and cleaning agent technology, which is applied in the chemical industry, can solve problems such as threatening the life safety of construction workers, difficulty in waste liquid treatment, and side effects, so as to improve the quality of maintenance, prevent stress corrosion cracking, and prevent local The effect of corrosion

Inactive Publication Date: 2012-02-08
NINGBO ZHONGYI PETROCHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) The earliest application of steam purging is low in cost and has no corrosive effect on equipment, but the cleaning time is long and the effect is poor
(2) Traditional cleaning of FeS with acidic medium x can effectively transfer the FeS in the device x Clean up, but the cleaning process will also bring a series of problems: first, acid scavenger and FeS x The reaction produces a large amount of toxic H 2 S gas not only threatens the life safety of construction workers, but also causes environmental pollution; second, acidic FeS x The scavenger is highly corrosive to carbon steel equipment. If the equipment is corroded during the construction process (such as remaining in the dead corner of the equipment), it will

Method used

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  • Chemical cleaning agent for clearing impurities such as ferrous sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 10g of citric acid in 20g of water, add 1g of sodium dodecylbenzene sulfonate, stir well, add 30g of 10% ammonia solution, control the pH between 3-5, and then add 2.5g of 1% polyphosphate A ester And 0.5g of benzoic acid, stir to dissolve, then add 36g of 27% hydrogen peroxide. Dilute 5 mL of the prepared solution to 50 mL, and conduct a scale dissolution test of ferrous sulfide. The results are shown in Table 1.

Embodiment 2

[0024] Dissolve 12g of citric acid in 20g of water, add 1g of sodium dodecylbenzene sulfonate, stir well, add 6g of ethylenediamine, control the pH between 3-5, then add 3g of 1% polyphosphate A ester and 1g Sodium benzoate, stir to dissolve, then add 37g of 27% hydrogen peroxide. Dilute 5 mL of the prepared solution to 50 mL, and conduct a scale dissolution test of ferrous sulfide. The results are shown in Table 1.

Embodiment 3

[0026] Dissolve 15g of EDTA disodium in 30g of water, add 0.5g of sodium dodecylbenzene sulfonate, stir well, add 10g of concentrated ammonia water, control the pH at 3-5, then add 1g of 1% polyphosphate A ester and 0.5g of benzene After stirring the sodium formate to dissolve, add 43g of 27% hydrogen peroxide. Dilute 5 mL of the prepared solution to 50 mL, and carry out the ferrous sulfide scaling test. The results are shown in Table 1.

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Abstract

The invention relates to a chemical cleaning agent for clearing impurities such as ferrous sulfide, which is made of the following raw materials in percentage by weight: 1-15% of acidic chelating agent, 0.05-5% of surfactant, 1-20% of alkaline chelating agent, 5-30% of oxidant, 0.1-1% of corrosion inhibitor, 0.1-2% of cosolvent and the balance of water; the acidic chelating agent is preferably selected from citric acid; the surfactant is preferably selected from sodium dodecyl benzene sulfonate; the alkaline chelating agent is preferably selected from ammonia or disodium ethylene diaminetetraacetate; the oxidant is preferably selected from hydrogen peroxide; the corrosion inhibitor is preferably selected from polybasic phosphate (A ester); and the cosolvent is preferably selected from benzoic acid or sodium benzoate. The invention has the beneficial effects of effectively clearing dirt such as ferrous sulfide in devices at normal temperatures and avoiding the spontaneous combustion of the ferrous sulfide and has the characteristics of low cost, large dirt clearing amount, good dirt clearing effect, non-toxicity, safety, simple and convenient operation, and the like.

Description

Technical field [0001] The invention relates to the field of chemical engineering, and in particular to a chemical cleaning agent for removing impurities such as ferrous sulfide. Background technique [0002] During the processing, storage and transportation of sour crude oil, because most of the processing, storage equipment and transportation pipelines are made of carbon steel, carbon steel is easily corroded by sulfur to form FeS x Such materials and rust are deposited in related equipment and pipelines. With the widespread application of fiber liquid membrane mass transfer equipment in the field of oil desulfurization, FeS x Impurities such as rust, rust, and gums in oils are likely to cause clogging of this type of equipment. In addition, FeS x Contact with air is prone to spontaneous combustion leading to fires, explosions and other accidents, which seriously affects the long-term operation of petrochemical plants and poses a great threat to production safety. Therefore, h...

Claims

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Application Information

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IPC IPC(8): C23G1/06C23G1/08
Inventor 徐振华童仁可蔡喜洋贺立明杨仁宗谌学军
Owner NINGBO ZHONGYI PETROCHEM TECH
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