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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
  • Claims
  • 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, no substantial improvement has been made to the oxidation method, and air is still used as the oxidant, and there are still problems such as oxidation speed and equipment corrosion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

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