Catalyst used in synthesis of propylene carbonate and preparation method and application thereof

A technology of propylene carbonate and a catalyst is applied to a catalyst for synthesizing propylene carbonate and its preparation and application fields, and can solve the problems of poor stability, high catalyst toxicity, harsh reaction conditions and the like

Active Publication Date: 2011-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above catalysts all have some disadvantages more or less: some have the disadvantage of being difficult to separate, some have the disadvantage of harsh reaction conditions, some have the disadvantage of high toxicity or high cost in the catalyst preparation process, and some have the disadvantage of poor stability. shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At 60°C, under stirring, add 300 ml of ethanol and 300 ml of water to 150 ml of ethyl orthosilicate, stir for 4 hours, then add 30 ml of ammonia water, continue to stir for 2 hours, then add 93 ml of KH550, continue to stir for 24 hours, and age 6 days, followed by drying in a vacuum oven at 40°C for 8 hours to yield aminopropyl functionalized silica. The silica is ground into powder. Take 4.6 g of zinc chloride, dissolve it in 100 ml of distilled water, and immerse it on the silica powder. Stir well and dry at 110°C for 4 hours. 1 gram of catalyst was put into the reactor, 80 grams of propylene oxide was added, the reactor was sealed, 0.8MPa carbon dioxide was poured into it, and under stirring conditions, the temperature was raised to 150°C, and the pressure was raised to 4.0MPa. After 8 hours of reaction, the reaction was stopped, and the liquid product was analyzed. The conversion rate of propylene oxide was 70.3%, and the selectivity of propylene carbonate was 95...

Embodiment 2

[0023] At 60°C, under stirring, add 300 ml of ethanol and 300 ml of water to 150 ml of ethyl orthosilicate, stir for 4 hours, then add 30 ml of ammonia water, continue to stir for 2 hours, then add 93 ml of KH550, continue to stir for 24 hours, and age 6 days, followed by drying in a vacuum oven at 40°C for 8 hours to yield aminopropyl functionalized silica. The silica is ground into powder. Take 4.6 g of zinc bromide, dissolve it in 100 ml of distilled water, and immerse it on the silica powder. Stir well and dry at 110°C for 4 hours. Catalyst evaluation was the same as Example 1 except that the reaction pressure was 3.0 MPa. After 8 hours of reaction, the reaction was stopped, and the liquid product was analyzed. The conversion rate of propylene oxide was 75.6%, and the selectivity of propylene carbonate was 96.2%.

Embodiment 3

[0025] At 60°C, under stirring, add 300 ml of ethanol and 300 ml of water to 150 ml of ethyl orthosilicate, stir for 4 hours, then add 30 ml of ammonia water, continue stirring for 2 hours, then add 45 ml of KH550, continue stirring for 24 hours, and age 6 days, followed by drying in a vacuum oven at 40°C for 8 hours to yield aminopropyl functionalized silica. The silica is ground into powder. Take 11.1 g of zinc chloride, dissolve it in 100 ml of distilled water, and immerse it on the silica powder. Stir well and then dry at 110°C for 4 hours. The catalyst evaluation was the same as in Example 2. After 8 hours of reaction, the reaction was stopped, and the liquid product was analyzed. The conversion rate of propylene oxide was 73.4%, and the selectivity of propylene carbonate was 95.7%.

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Abstract

The invention relates to a catalyst used in synthesis of propylene carbonate from carbon dioxide and propylene oxide, and a preparation method and application thereof. The catalyst comprises the following components in percentage by weight: 5 to 15 percent of zinc salt, 15 to 25 percent of organic amine and 70 percent of silicon dioxide, wherein the zinc salt, halogen and the organic amine are used as active ingredients of the catalyst; SiO2 is used as a carrier; the zinc salt is zinc chloride or zinc bromide; the organic amine is aminopropyltriethoxysilane; the SiO2 carrier is prepared from tetraethoxysilane under an alkaline condition by hydrolysis; the catalyst has specific surface of between 160 to 250m<2>/g and pore volume of between 0.7 and 0.9cm<3>/g; the conversion rate of the propylene oxide can reach 90.2 percent, and selectivity of the propylene carbonate reaches 97.5 percent; and after the catalyst is repeatedly used for 4 times, the conversion rate of the propylene oxide is 89.1 percent, and the selectivity of the propylene carbonate is 97.6 percent.

Description

technical field [0001] The invention relates to a catalyst for synthesizing propylene carbonate from carbon dioxide and propylene oxide, and a preparation method and application thereof. Background technique [0002] carbon dioxide (CO 2 ) is the final oxidation product of carbon-containing compounds, and its massive emission not only wastes resources, but also pollutes the environment and causes a global greenhouse effect. Therefore, the rational development and utilization of carbon dioxide is of great significance in both economic and social benefits. At present, the development of green chemistry based on carbon dioxide fixation has received extensive attention from researchers. Among them, the synthesis of carbonate from carbon dioxide and alkylene oxide is one of the most successful examples of carbon dioxide fixation. Carbonate is an excellent solvent and organic synthesis intermediate. Its monomer can be used as a solvent in textile, printing and dyeing, polymer syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/02C07D317/36
CPCY02P20/584
Inventor 周玮马中义李正赵胤石大川吴涛张成业杨耀辉蒋海洋周磊
Owner PETROCHINA CO LTD
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