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Method for removing dimethyl disulfide through oxidation

A technology for removing dimethyl disulfide, which is used in the refining of oxygenated compounds, petroleum industry, and multi-stage series refining process treatment, etc., can solve the problem of difficult removal of dimethyl disulfide, solubility Small and other problems, to achieve the effect of mild reaction conditions and simple operation steps

Inactive Publication Date: 2009-09-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dimethyl disulfide is stable in nature and has low solubility in aqueous solution. It is difficult to remove dimethyl disulfide while removing hydrogen sulfide in the existing desulfurization process
[0010] So far, there has been no use of titanium-silicon molecular sieves, heteropolyacids or organic acids as catalysts, and hydrogen peroxide as an oxidizing agent to oxidize dimethyl disulfide in liquid fuels or liquefied gases, while oxidizing them with solid adsorbents or solvent extraction. Reported removal of its oxidation products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve dimethyl disulfide in n-octane to prepare simulated fuel, and the molecular content of dimethyl disulfide is 600 μg / g. The selective oxidation reaction is carried out in a three-port reactor with a water bath jacket, and the temperature is controlled by the water bath. 0.01g of TS-1 catalyst, 0.1g of boehmite, 10mL of the above-mentioned simulated fuel, and 40 g of oxidant hydrogen peroxide (30wt%) were sequentially added into the reactor. h 2 o 2 / sulfide molar ratio is 8:1. The temperature is 60°C. Electromagnetic stirring was used to react for 2 hours. The result of the reaction was that the removal rate of dimethyl disulfide was 93.65%.

Embodiment 2

[0021] Dissolve dimethyl disulfide in n-octane to prepare simulated fuel, and the molecular content of dimethyl disulfide is 600 μg / g. The selective oxidation reaction is carried out in a three-port reactor with a water bath jacket, and the temperature is controlled by the water bath. 0.01g of TS-1 catalyst, 0.1g of basic alumina, 10mL of the above simulated fuel, and oxidant hydrogen peroxide (30wt.%) 40 g were added to the reactor in sequence. h 2 o 2 / sulfide molar ratio is 8:1. The temperature is 60°C. Electromagnetic stirring was used to react for 2 hours. The result of the reaction was that the removal rate of dimethyl disulfide was 92.62%.

Embodiment 3

[0023] Dissolve dimethyl disulfide in n-octane to prepare simulated fuel, and the molecular content of dimethyl disulfide is 600 μg / g. The selective oxidation reaction is carried out in a three-port reactor with a water bath jacket, and the temperature is controlled by the water bath. 0.01g of TS-1 catalyst, 0.1g of acidic alumina, 10mL of the above-mentioned simulated fuel, and 40μL of oxidant hydrogen peroxide (30wt.%) were sequentially added into the reactor. h 2 o 2 / sulfide molar ratio is 8:1. The temperature is 60°C. Electromagnetic stirring was used to react for 2 hours. The result of the reaction was that the removal rate of dimethyl disulfide was 77.49%.

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Abstract

The invention discloses a method for removing dimethyl disulfide through oxidation, which is used for removing dimethyl disulfide in liquid fuel or liquefied gas, belonging to the technical field of oil processing. The method is characterized in that titanium silicalite molecular sieves and heteropoly acid or organic acid are taken as catalysts, and the mol ratio of the titanium silicalite molecular sieves, heteropoly acid or organic acid to a sulfide is 4 : 1-16 : 1; dimethyl is dioxidized, and solid absorbent is simultaneously used for absorbing oxidization product of the dimethyl disulfide, or a solvent is used for extracting the oxidization product of the dimethyl disulfide, thereby removing the dimethyl disulfide. The method has the advantages that the desulfurization rate of the dimethyl disulfide in the liquid fuel or the liquefied gas reaches 92.98 percent due to the adoption of the method, the content is 290.3 mg / m<3>, the reaction conditions are mild, and the operation is simple.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and relates to a method for oxidizing dimethyl disulfide in liquid fuel or liquefied gas by using titanium-silicon molecular sieve, heteropoly acid or organic acid as a catalyst, hydrogen peroxide as an oxidant, and simultaneously oxidizing with solid adsorption The method of removing its oxidation products by solvent adsorption or solvent extraction. Background technique [0002] Dimethyl disulfide is a harmful organic sulfide. It mainly exists in the liquefied gas of catalytic cracking, delayed coking and other devices in the petroleum refining process. Dimethyl disulfide is stable in nature and has low solubility in aqueous solution. It is difficult to remove dimethyl disulfide while removing hydrogen sulfide in the existing desulfurization process. Researchers at home and abroad use different catalysts and oxidants to remove dimethyl disulfide. [0003] Literature [Sci.Total.E...

Claims

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Application Information

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IPC IPC(8): C10G53/14C10G27/12C10L3/12
Inventor 李　钢袁红玉董琳燕李钢
Owner DALIAN UNIV OF TECH
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