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Catalyst for liquid phase alkylation of ethylene to prepare ethylbenzene

A technology of ethylene liquid-phase alkyl and catalyst, which is applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc. It can solve the problems of poor catalyst stability and regeneration performance, and improve hydrothermal stability and coke capacity Improvement, activity stability improvement effect

Inactive Publication Date: 2004-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of poor catalyst stability and regeneration performance in the liquid-phase alkylation reaction of benzene and ethylene in the previous literature, and a new method for producing ethylbenzene by liquid-phase alkylation of ethylene is provided. catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Get 50 grams of sodium type beta zeolite molecular sieve former powder, its silicon aluminum molar ratio SiO 2 / Al 2 o 3 is 25, the sodium-type zeolite beta molecular sieve powder is exchanged with ammonium nitrate solution, and after drying, the ammonium-type beta zeolite molecular sieve is obtained. Strip, drying and calcining to obtain a strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm.

[0010] The above catalyst was treated with water steam for 6 hours under the condition of 520°C. Then treat it with 0.5 mol / L citric acid solution at 50°C for 7 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.

[0011] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene ...

Embodiment 2

[0022] The strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm prepared according to Example 1 was treated with water vapor at 470° C. for 8 hours. Then treat it with 0.5 mol / L citric acid solution at 50°C for 7 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.

[0023] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene conversion rate is 100%, and the ethylbenzene selectivity is 93.6%. After 500 hours of reaction, the ethylene conversion rate is 99%, and the ethylbenzene selectivity is 92.7%. The reaction was carried out for 485 hours before ethylene was detected in the reaction product, indicating that the activity and stability of the catalyst was good. In order to ev...

Embodiment 3

[0025] The strip-shaped hydrogen-type catalyst with a diameter of 1.6 mm prepared according to Example 1 was treated with water vapor at 470° C. for 8 hours. Then treat it with 1.0 mol / L citric acid solution at 50°C for 4 hours, the weight ratio of the citric acid solution to the catalyst is 5, dry and roast at 480°C for 3 hours to obtain the finished catalyst.

[0026] Take 2 grams of the catalyst prepared above and place it in a fixed-bed reactor. At a temperature of 220°C, a pressure of 3.5 MPa, a benzene / ethylene molar ratio of 6 / 1, and an ethylene weight space velocity of 1.5 hours -1 Under the conditions, the ethylene conversion rate is 100%, and the ethylbenzene selectivity is 93.8%. After 500 hours of reaction, the ethylene conversion rate is 99%, and the ethylbenzene selectivity is 92.6%. The reaction was carried out for 480 hours before ethylene was detected in the reaction product, indicating that the activity and stability of the catalyst was good. In order to ev...

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Abstract

The present invention relates to one kind of catalyst for liquid phase alkylation of ethylene to prepare ethylbenzene and aims at raising the stability and regeneration performance of catalyst. The present invention adops beta-zeolite molecular sieve with SiO2 / Al2O3 molar ratio of 10-50 as catalyst, and the catalyst is processed first with high temperature steam and then with organic acid before use, and this raises the stability and regeneration performance of catalyst. The present invention may be used in the industrial production of liquid phase alkylation to prepare ethylbenzene.

Description

technical field [0001] The invention relates to a catalyst for producing ethylbenzene by liquid-phase alkylation of ethylene, in particular to a beta zeolite molecular sieve catalyst for producing ethylbenzene by liquid-phase alkylation of ethylene. Background technique [0002] Ethylbenzene is an important petrochemical raw material, mainly used in the production of high molecular monomer - styrene. It can be produced by various chemical production methods. The traditional catalysts are crystalline and amorphous silica, boron fluoride, alumina, phosphoric acid, aluminum trichloride and solid phosphoric acid catalyst. These traditional catalytic processes have the disadvantages of serious corrosion, large equipment investment, and many wastes. In recent years, people have conducted extensive and in-depth research on molecular sieves, and some companies have been devoting themselves to the new technology of using molecular sieves as catalysts t...

Claims

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Application Information

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IPC IPC(8): B01J29/06C07C2/66C07C15/073
CPCY02P20/52Y02P20/584
Inventor 孙洪敏杨为民
Owner CHINA PETROLEUM & CHEM CORP
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