Method for regenerating alkali liquor containing sodium thioalcohol

A technology of sodium mercaptide lye and sodium mercaptide alkali is applied in the petroleum industry, refined hydrocarbon oil and other directions, and can solve the problems of the oxidation method not making substantial improvements, the corrosion of the oxidation rate equipment, and the long material residence time, etc., To achieve the effect of reducing capital investment, reducing the degree of corrosion, and improving the speed of oxidation reaction

Inactive Publication Date: 2007-11-28
NINGBO ZHONGYI PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the high temperature lye greatly accelerates the corrosion of equipment
[0007] 4. Due to the slow oxidation rate, a longer material residence time is usually required
However,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] In a 500ml glass three-neck flask with stirring, add 300ml sodium methyl mercaptan 9%wt (calculated as sulfur content), 17%wt sodium hydroxide aqueous solution, add 150ppm concentration of sulfonated cobalt phthalocyanide, at 30 Under the condition of ℃ and normal pressure (absolute pressure of 0.1MPa), through a gas distribution head, add oxygen-enriched air with an oxygen concentration of 80% (v), the gas flow rate is 300ml / min, and the stirring speed is 160rpm. After 15 minutes, the oxygen-enriched air was stopped. After 1 minute of standing still, a layer of disulfide oil phase has floated on the lye. Remove the lower layer of lye and analyze the concentration of sodium thiolate. Sodium thiolate is 4.1%wt (calculated as sulfur content). The conversion rate of sodium methyl mercaptan is 54%. The composition of the disulfide is 99.6% dimethyl disulfide and 0.4% methyl sulfide.

Example Embodiment

[0025] Example 2

[0026] In a 500ml glass three-neck flask with stirring, add 300ml sodium methyl mercaptan 9%wt (calculated as sulfur content), 17%wt sodium hydroxide aqueous solution, add 150ppm concentration of sulfonated cobalt phthalocyanide, at 30 Under the condition of ℃ and normal pressure (absolute pressure 0.1MPa), through a gas distribution head, add oxygen-enriched air with an oxygen concentration of 50% (v), the gas flow rate is 300ml / min, and the stirring speed is 160rpm. After 15 minutes, the oxygen-enriched air was stopped. After 1 minute of standing still, a layer of disulfide oil phase has floated on the lye. Take the lower layer of lye and analyze the concentration of sodium thiolate. Sodium thiolate is 6.1%wt (calculated as sulfur content). The conversion rate of sodium methyl mercaptan is 32%. The composition of the disulfide is 99.5% dimethyl disulfide and 0.5% methyl sulfide.

Example Embodiment

[0027] Example 3

[0028] In a 500ml glass three-necked flask with stirring, add 300ml sodium methyl mercaptan 9%wt (calculated as sulfur content), 17%wt sodium hydroxide aqueous solution, add 150ppm concentration of sulfonated cobalt phthalocyanide, at 70 Under the condition of ℃ and normal pressure (absolute pressure 0.1MPa), through a gas distribution head, add oxygen-enriched air with an oxygen concentration of 50% (v), the gas flow rate is 300ml / min, and the stirring speed is 160rpm. After 15 minutes, the oxygen-enriched air was stopped. After 1 minute of standing still, a layer of disulfide oil phase has floated on the lye. Remove the lower layer of lye and analyze the concentration of sodium thiolate. The sodium thiolate is 1.7%wt (calculated based on the sulfur content). The conversion rate of sodium methyl mercaptan is 81%.

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Abstract

The method of regenerating alkali solution containing sodium mercaptide is to oxidize sodium mercaptide in alkali solution with oxygen-rich air with oxygen concentration of 26-99.99 vol% intelligent presence of catalyst, such as cobalt phthalcyanide sulfonate, into disulfide. Sodium mercaptide including sodium methyl mercaptide, sodium ethyl mercaptide, etc in alkali solution, such as water solution of sodium hydroxide, is mixed with oxygen-rich air and reacted under the action of catalyst, such as cobalt phthalcyanide sulfonate, to produce sodium hydroxide and disulfide, such as dimethyl disulfide, diethyl disulfide, etc., so that the alkali solution has lowered sodium mercaptide concentration and raised sodium hydroxide concentration. The regenerated alkali solution after eliminating the disulfide may be reused in the mercaptide eluting process of liquefied alkali.

Description

technical field [0001] The invention relates to a method for regenerating lye, in particular to a method for regenerating lye containing sodium mercaptide applied in petroleum and natural gas industries, and belongs to the technical field of petroleum and gas industry in the Ministry of Chemical Metallurgy. Background technique [0002] Existing refinery liquefied gas or other light oil products generally use sodium hydroxide aqueous solution washing or extraction method to remove sulfides such as methyl mercaptan, ethyl mercaptan and so on. After such a desulfurization process, sodium hydroxide reacts with mercaptan to form sodium mercaptide, the concentration of sodium hydroxide gradually decreases, and the concentration of sodium mercaptide gradually increases, turning into spent lye. There are roughly two types of methods for dealing with spent lye, one is to discharge it to another environmental protection device for processing, and the other is to oxidize the alkali un...

Claims

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Application Information

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IPC IPC(8): C10G19/08
Inventor 聂通元
Owner NINGBO ZHONGYI PETROCHEM TECH
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