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Catalyst for synthesizing ethylbenzene through ethylene and benzene liquid phase method and preparation and application of catalyst

A technology for synthesizing ethylbenzene and catalysts, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic performance, low strong acid density, side reactions, etc., and achieve high catalytic activity and catalytic efficiency. Effect

Active Publication Date: 2014-06-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its pore characteristics, beta zeolite is less conducive to the diffusion of macromolecules than MCM-49 molecular sieve, and is prone to cause side reactions; performance

Method used

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  • Catalyst for synthesizing ethylbenzene through ethylene and benzene liquid phase method and preparation and application of catalyst
  • Catalyst for synthesizing ethylbenzene through ethylene and benzene liquid phase method and preparation and application of catalyst
  • Catalyst for synthesizing ethylbenzene through ethylene and benzene liquid phase method and preparation and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] At 40°C, dissolve 100 grams of MCM-49, 1.2 grams of sodium hydroxide, and 50 grams of tetraethylammonium bromide in 108 ml of deionized water, add 100 grams of silica sol under stirring, and continue stirring for 10 minutes to make it uniform sol-gel. Move it into a crystallization kettle and crystallize at 140°C. After 96 hours, the obtained product was filtered and washed with distilled water until pH=10. Then it was dried at 110°C for 12 hours and calcined at 560°C for 4 hours to obtain MCM-49-β molecular sieve. The obtained molecular sieve was then ion-exchanged in a 20% (wt) ammonium nitrate solution, then dried at 110°C for 12 hours, and calcined at 560°C for 4 hours to obtain molecular sieve material A.

Embodiment 2

[0019] At 20°C, dissolve 100 grams of MCM-49, 7 grams of sodium hydroxide, and 300 grams of tetraethylammonium bromide in 500 ml of deionized water, add 300 grams of silica sol under stirring, and continue stirring for 5 minutes to make it uniform sol-gel. Move it into a crystallization kettle and crystallize at 150°C. After 48 hours, the crystallization was completed, and the obtained product was filtered and washed with distilled water until pH=10. Then it was dried at 110°C for 12 hours and calcined at 580°C for 4 hours to obtain MCM-49-β molecular sieve. The obtained molecular sieve was then ion-exchanged in an ammonium nitrate solution with a concentration of 15% (wt), then dried at 110°C for 12 hours, and calcined at 580°C for 4 hours to obtain molecular sieve material B.

Embodiment 3

[0021] At 60°C, dissolve 100 grams of MCM-49, 12 grams of sodium hydroxide, and 380 grams of tetraethylammonium bromide in 550 ml of deionized water, add 250 grams of silica sol under stirring, and continue stirring for 10 minutes to make it uniform sol-gel. Move it into a crystallization kettle and crystallize at 150°C. After 48 hours, the obtained product was filtered and washed with distilled water until pH=10. Then it was dried at 110°C for 12 hours and calcined at 580°C for 4 hours to obtain MCM-49-β molecular sieve. The obtained molecular sieve was then ion-exchanged in an ammonium nitrate solution with a concentration of 10% (wt), then dried at 110°C for 12 hours, and calcined at 580°C for 4 hours to obtain molecular sieve material C.

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Abstract

The invention relates to a catalyst for synthesizing ethylbenzene through an ethylene and benzene liquid phase method and preparation and application of catalyst. The preparation method comprises the following steps: uniformly mixing and stirring an MCM-49 molecular sieve, sodium hydroxide, water, tetraethylammonium bromide and silica sol in a gelatinizing kettle at the temperature of 20-60 DEG C, forming uniform sol-gel, and continuously stirring for 5-10 minutes; crystallizing in a crystallization kettle at the temperature of 140-150 DEG C for 48-96 hours; and filtering the obtained product, washing to pH of 10 by using distilled water, drying at the temperature of 110 DEG C for 12 hours, roasting at the temperature of 560-580 DEG C for 4 hours, performing ion exchange on the obtained MCM-49-beta molecular sieve in a ammonium nitrate solution with the concentration of 10-20 percent, drying at the temperature of 110 DEG C for 12 hours, and roasting at the temperature of 560-580 DEG C for 4 hours. According to the catalyst, the ethylene conversion rate is above 98 percent in the process of preparing the ethylbenzene through ethylene and benzene, the selectivity of the ethylbenzene is above 99 percent, and the product does not contain dimethylbenzene.

Description

technical field [0001] The invention relates to the preparation of a catalyst used in the liquid-phase synthesis of ethylbenzene from ethylene and benzene, in particular to the preparation and application of a composite molecular sieve catalyst used in the liquid-phase synthesis of ethylbenzene. Background technique [0002] Styrene is an important basic organic raw material, which has important applications in automobile manufacturing, household appliances, textiles, building materials, light industry and toys. Ethylbenzene is an important raw material for the production of styrene, which is mainly produced industrially through the alkylation reaction of benzene and ethylene. At present, the main processes used in the world for ethylbenzene alkylation include aluminum chloride liquid-phase catalysis, molecular sieve gas-phase catalysis and liquid-phase catalysis. The catalyst of the aluminum chloride catalytic method is highly corrosive, which brings great inconvenience to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C15/073C07C2/66
CPCY02P20/52
Inventor 周玮马中义李正赵胤邓广金崔龙张凤秋侯立波董丽杰吕红秋刘清玲刘春艳焦立平
Owner PETROCHINA CO LTD
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