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Catalyst applied to preparation of isopropyl benzene by performing liquid-phase alkylation on propylene

A propylene liquid-phase alkyl, cumene technology, applied in physical/chemical process catalysts, molecular sieve catalysts, catalyst activation/preparation and other directions, can solve the problems of low selectivity of monoisopropylbenzene, etc., and improve monoisopropylbenzene Selective, good technical effects

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low selectivity of monocumene in the liquid-phase alkylation reaction of benzene and propylene in the prior art, and a new method for producing isopropyl benzene by liquid-phase alkylation of propylene is provided. Benzene catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Synthesize β molecular sieve according to the method described in CN1249270A (silicon-aluminum mol ratio SiO 2 / Al 2 o 3 For 23), the synthesized molecular sieve is exchanged with ammonium nitrate to have an alkali metal ion content of less than 100ppm.

[0014] Mix 100 grams of the treated molecular sieve with 35 grams of aluminum oxide evenly, add 145 milliliters of 5% (weight) nitric acid solution and 5 grams of asparagus powder, knead for 2 hours, and then extrude into strips. The formed catalyst was dried at 150°C, and then heated to 580°C for 4 hours in an air atmosphere to obtain catalyst A.

Embodiment 2

[0016] 100 g of catalyst A was charged into an isothermal fixed bed, modified with a mixture of benzene (98% by weight) and cumene (2% by weight), to obtain catalyst B. The treatment temperature is 150°C, the treatment pressure is 2.5MPa, the treatment time is 120 hours, and the total liquid phase weight space velocity is 15 hours -1 .

Embodiment 3

[0018] Catalyst B is crushed into 20-60 mesh particles, and 1.0 g of catalyst is used for liquid-phase alkylation of propylene in a fixed-bed reactor. The reaction conditions are: propylene space velocity 1.5 hours -1 , The reaction temperature is 150°C, the reaction pressure is 2.7MPa, and the reaction products are cumene and polyisopropylbenzene. The reaction result is: the conversion rate of propylene is 100%, the product propyl group selectivity is greater than 99.2%, the total benzene-hydrocarbon ratio is 3.1 (mole), the outlet cumene concentration is 35%, and the monocumene weight selectivity is 92.8% based on benzene.

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Abstract

The invention relates to a catalyst applied to preparation of isopropyl benzene by performing liquid-phase alkylation on propylene, which is mainly used for solving the problem of low mono-isopropyl benzene selectivity in a liquid-phase alkylation reaction of benzene and the propylene in the prior art. The catalyst comprises the following components in parts by weight: 50-80 parts of at least onemolecular sieve selected from a Y molecular sieve, a beta molecular sieve or an MCM-22 molecular sieve and 20-50 parts of inorganic oxide, wherein the catalyst is modified with mixed liquor of benzene and isopropyl benzene at the treatment temperature 110-160 DEG C under the treatment pressure 2.0-2.8 MPa for 2-200 hours; the total liquid phase weight space velocity is 2-20 h<-1>; and the weight ratio of the benzene to the isopropyl benzene in the mixed liquor of the benzene and the isopropyl benzene is 15-80. By adopting the technical scheme, the problem is well solved; and the catalyst can be applied to industrial production of isopropyl benzene by performing liquid-phase alkylation on propylene.

Description

technical field [0001] The invention relates to a catalyst for producing cumene by liquid-phase alkylation of propylene. Background technique [0002] Cumene is an important intermediate raw material for the production of phenol, acetone and α-methylstyrene. At present, more than 90% of phenol in the world is produced by the cumene method. The traditional method of producing cumene in industry has the solid phosphoric acid method (SPA method) of U.S. Universal Oil Company (UOP) and the improved AlCl of Monsanto / Lummus Crest company 3 Law. The operating conditions of SPA are harsh and there are many impurities, so the yield of cumene cannot be increased by anti-alkylation. while AlCl 3 Although the method has milder reaction conditions and can increase the yield of cumene through anti-alkylation, the catalyst is highly corrosive, polluted heavily and post-treatment is complicated. [0003] Molecular sieve liquid-phase alkylation method has mild reaction conditions, high ...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J29/08B01J37/00C07C15/085C07C2/66
CPCY02P20/52
Inventor 周斌高焕新魏一伦方华顾瑞芳
Owner CHINA PETROLEUM & CHEM CORP
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