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Method for preparing epoxypropane through propylene epoxidation

A technology of propylene oxide and epoxidation, applied in the direction of organic chemistry, can solve the problems of low concentration, unfavorable and high energy consumption of separation of propylene oxide system

Pending Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the limitations of the anthraquinone method, the system concentration of propylene oxide in this method is low, and the subsequent separation energy consumption is high
[0006] Literature: Gao S, Li M, Lv Y, Zhou N, Xi Z W. Epoxidation of Propylene with Aqueous Hydrogen Peroxide on a Reaction-Controlled Phase-Transfer Catalyst [J]. Organic Process Research & Development, 2004, 8: 131 disclosed the following Hydrogen peroxide solution is the oxygen source, and the phosphotungstic heteropolyacid quaternary ammonium salt with reaction-controlled phase transfer characteristics is used as the catalyst for the propylene epoxidation reaction, and it is found that the increase of the water content in the system is unfavorable for the epoxidation reaction

Method used

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  • Method for preparing epoxypropane through propylene epoxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of catalyst: Reference Journal of Molecular Catalysis A, 2001, 166:219.

[0025] Weigh 2.50 g of tungstic acid and add it to 10 ml of hydrogen peroxide with a concentration of 30%, and heat to 60° C. while stirring. A colorless and transparent solution is obtained after 60 minutes. At room temperature, 0.29 g of phosphoric acid with a concentration of 85% was added to the solution, 20 ml of distilled water was added, and stirring was continued for 30 minutes. Weigh 2.5g of cetyltrimethylammonium chloride and dissolve it in 40ml of dichloroethane. Add this solution to the above-mentioned hydrogen peroxide solution quickly at room temperature, and continue to stir for 60 minutes to obtain a precipitate. Wash the precipitate with distilled water until the pH of the filtrate is approximately 4. The filtrate is vacuum dried at 50-60°C to obtain a quaternary ammonium phosphotungstic acid catalyst.

[0026] Distilled water pretreatment of the working solution: In a 25...

Embodiment 2

[0029] The cetyl trimethyl ammonium chloride in the preparation process of the catalyst of Example 1 was replaced with octadecyl trimethyl ammonium chloride; the cetyl trimethyl ammonium chloride was 0.5 during the distilled water pretreatment process g was changed to 0.2g of sodium dihydrogen phosphate; the reaction temperature of the epoxidation process was changed from 80°C to 70°C, and the reaction time was 4h. Through gas chromatography analysis, the yield of propylene oxide to hydrogen peroxide was 86%.

Embodiment 3

[0031] The toluene in the distilled water pretreatment process of Example 1 was changed to xylene, 60 ml of sulfolane was changed to 50 ml of diphenyl sulfone, and the water separation rate was 85%. The reaction temperature of the epoxidation process was changed from 80°C to 75°C, and the reaction time was 4.5h. Through gas chromatography analysis, the yield of propylene oxide to hydrogen peroxide was 82%.

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Abstract

The invention provides a method for preparing epoxypropane through propylene epoxidation. The method comprises the step that propylene and hydrogen peroxide are subjected to an epoxidation reaction inthe presence of a sulfone organic solvent, a phosphotungstic heteropoly acid quaternary ammonium salt catalyst and an additive. The method further comprises the following steps: before epoxidation reaction, carrying out distilled water pretreatment on a hydrogen peroxide-containing solvent system, carrying out epoxidation reaction, carrying out post-treatment on the reaction mixture, and separating out propylene, epoxypropane, part of the solvent and water. The method is simple in process, high in system product concentration and suitable for industrial application, and the catalyst and the solvent are easy to recycle.

Description

Technical field [0001] The invention relates to a method for preparing propylene oxide. Background technique [0002] Propylene oxide (PO) is an important basic organic chemical raw material. Mainly used in the production of polyurethane, unsaturated resin and surfactants. Propylene oxide is also an important raw material for fine chemical products, and its downstream derivative products are nearly 100, which are widely used in many industries such as automobiles, construction, food, medicine and cosmetics. [0003] At present, the industrial production methods of propylene oxide mainly include the chlorohydrin method and the co-oxidation method (Halcon method). The production capacity of these two methods accounts for more than 95% of the world's PO production capacity. The chlorohydrin method seriously pollutes the environment, and the equipment corrodes badly, and will be gradually eliminated. The co-oxidation method overcomes the shortcomings of the chlorohydrin method, but ...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D303/04
CPCC07D301/12C07D303/04
Inventor 高爽赵公大吕迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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