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Benzene and ethylene alkylation reaction

A technology of ethylene alkylation and reaction, applied in molecular sieves and alkali exchange compounds, organic chemistry, inorganic chemistry, etc., can solve the problems of large grain size and high side reactions

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that in the prior art benzene and ethylene alkylation reaction, the side reaction problem is too high, the ZSM-5 molecular sieve grain size that the prior art adopts is too large; The ZSM-5 molecular sieve of synthesis contains alkali metal ions, an ammonium exchange process is required to exchange molecular sieves to NH 4 -ZSM-5 and other issues

Method used

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  • Benzene and ethylene alkylation reaction
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Examples

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Effect test

Embodiment 1

[0028] The synthetic process of sodium-free ZSM-5 molecular sieve is as follows: 5g commercial ZSM-5 molecular sieve and 50g mass concentration are 25% alkaline substance aqueous solution (R1, R2, R3 and R4 are all propyl in the alkali structural formula) mix homogeneously, then Treat in a closed environment at 100°C for 6 hours to obtain mixed liquid A, then add 18g of water, 0.666g of aluminum sulfate, 6g of white carbon black, 0.9g of ethylamine, 4.32g of NH 2 -(CH 2 ) 8 -NH 2 Mix with 3g of mixed solution A to obtain mixed solution B, wherein H 2 O / SiO 2 =10, SiO 2 / Al 2 o 3 =100, R / SiO 2 =0.2, Y / SiO 2 = 0.3, the mass ratio of mixed solution A to white carbon black in mixed solution B is 0.5, mixed solution B is crystallized in a closed environment at 150°C for 24 hours to obtain mixed solution C, and mixed solution C is subjected to conventional separation and drying, etc. The process obtains ZSM-5 molecular sieve. The scanning electron micrograph of ZSM-5 molec...

Embodiment 2

[0030]The synthetic process of sodium-free ZSM-5 molecular sieve is as follows: 5g commercial ZSM-5 molecular sieve and 50g mass concentration are 25% alkaline substance aqueous solution (R1, R2 are methyl in the alkali structural formula; R3, R4 are isopropyl) mix uniform, and then treated in a closed environment at 100°C for 6 hours to obtain a mixed solution A, and then 18g of water, 0.666g of aluminum sulfate, 6g of white carbon black, 0.9g of ethylamine, 4.32g of NH 2 -(CH 2 ) 8 -NH 2 Mix with 3g of mixed solution A to obtain mixed solution B, wherein H 2 O / SiO 2 =10, SiO 2 / Al 2 o 3 =100, R / SiO 2 =0.2, Y / SiO 2 =0.3, the mass ratio of mixed solution A to white carbon black in mixed solution B is 0.5, mixed solution B is crystallized in a closed environment at 150°C for 24 hours to obtain mixed solution C, and mixed solution C is subjected to conventional separation and drying, etc. The process obtains ZSM-5 molecular sieve. The ZSM-5 molecular sieve has a b-axis...

Embodiment 3

[0032] The synthesis process of sodium-free ZSM-5 molecular sieve is as follows: 5g of commercial ZSM-5 molecular sieve and 50g of mass concentration are 25% alkaline substance aqueous solution (in the alkali structural formula, R1, R2 are ethyl; R3, R4 are propyl) mix uniformly , and then treated in a closed environment at 100°C for 6h to obtain a mixed solution A, and then 18g of water, 0.666g of aluminum sulfate, 6g of white carbon black, 0.9g of ethylamine, 4.32g of NH 2 -(CH 2 ) 8 -NH 2 Mix with 3g of mixed solution A to obtain mixed solution B, wherein H 2 O / SiO 2 =10, SiO 2 / Al 2 o 3 =100, R / SiO 2 =0.2, Y / SiO 2 =0.3, the mass ratio of mixed solution A to white carbon black in mixed solution B is 0.5, mixed solution B is crystallized in a closed environment at 150°C for 24 hours to obtain mixed solution C, and mixed solution C is subjected to conventional separation and drying, etc. The process obtains ZSM-5 molecular sieve. The ZSM-5 molecular sieve has a b-ax...

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Abstract

The invention discloses an alkylation reaction of benzene and ethylene, and solves the problem of high side reaction in the prior art and the problem that an adopted ZSM-5 molecular sieve is large in grain size, contains alkali metal ions and needs to be exchanged into NH4-ZSM-5 in an ammonium exchange process. According to the invention, the axial growth coefficient of the ZSM-5 molecular sieve is 1-10, the b-axis size is 20-100 nm, and the Na content is 0.005-0.04 wt.%; the synthesis method of the sodium-free ZSM-5 molecular sieve comprises the following steps: 1) contacting a raw material ZSM-5 molecular sieve with an alkali solution to obtain a mixed solution A; 2) contacting water, an aluminum source, a silicon source, a guiding agent, an inhibitor and the solution A to obtain a mixed solution B; 3) crystallizing the mixed solution B to obtain a mixed solution C; and 4) treating the mixed solution C to obtain the ZSM-5 molecular sieve. By adopting the technical scheme, the problem is well solved.

Description

technical field [0001] The invention belongs to the technical field of catalytic chemistry and chemical engineering, and in particular relates to an alkylation reaction of benzene and ethylene. Background technique [0002] The alkylation reaction of benzene and ethylene usually adopts ZSM-5 molecular sieve, and does not add alkali metal ions during the crystallization process of ZSM-5 molecular sieve, and directly synthesizes NH 4 -ZSM-5 molecular sieve can effectively save the ammonium exchange process, reduce the discharge of ammonia nitrogen wastewater, and greatly reduce production costs. In 1980, D.M.Bibby et al. (Nature, 1980, 285:30-31) in NH 4 + Synthesis of NH in the system of tetraalkylamine 4 -ZSM-5 molecular sieve, the molecular sieve grain obtained by the method is larger than 10 μm. Patent CN1935652A discloses a method for preparing ZSM-5 molecular sieve without adding alkali metal ions. First, a directing agent solution is prepared at room temperature, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66B01J29/40C01B39/38
CPCC07C2/66B01J29/40C01B39/38C01B39/026C01P2004/03C07C15/073Y02P20/52
Inventor 杨为民王达锐孙洪敏宦明耀薛明伟
Owner CHINA PETROLEUM & CHEM CORP