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Liquid-phase alkylation catalyst, preparation method and application thereof, and method for carrying out liquid-phase alkylation reaction on benzene and ethylene

An alkylation reaction and alkylation technology, applied in the field of liquid-phase alkylation catalysts, can solve the problems of unsuitability for the use of liquid-phase alkylation catalysts for benzene and ethylene, poor diffusion performance, insufficient external acid content, etc.

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN106536411A reported the synthesis of a boron-containing zeolite with a MWW framework structure. Because it did not adopt a suitable deboronation method to obtain a large number of mesopores, it was not suitable for use as a liquid-phase alkylation catalyst for benzene and ethylene.
[0007] In summary, the existing liquid-phase alkyl catalysts used in liquid-phase alkylation to produce ethylbenzene have poor diffusion performance, insufficient acid content outside, low catalyst activity and conversion, or are not suitable as liquid-phase alkyl catalysts for benzene and ethylene. Problems with Catalyst Use

Method used

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  • Liquid-phase alkylation catalyst, preparation method and application thereof, and method for carrying out liquid-phase alkylation reaction on benzene and ethylene

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preparation example Construction

[0028] A second aspect of the present invention provides a method for preparing a liquid-phase alkylation catalyst, comprising:

[0029] (1) mixing and aging a boron source, a silicon source, an aluminum source, an alkali source, a templating agent and an aqueous solvent to obtain a gel;

[0030] (2) subjecting the gel to hydrothermal crystallization to obtain a crystallized product and mixing it with a binder to form a boron-containing MWW molecular sieve;

[0031] (3) The boron-containing MWW molecular sieve is subjected to ammonium ion exchange and roasting.

[0032] According to a preferred embodiment of the present invention, the addition of the boron source, silicon source, aluminum source, alkali source, templating agent and aqueous solvent satisfies the SiO 2 / Al 2 o 3 =10~200, B 2 o 3 / SiO 2 =0.001~0.25, OH - / SiO 2 =0.05~0.45,H 2 O / SiO 2 =5~100, template / SiO 2 =0.001~1, wherein, the boron source is represented by B 2 o 3 In terms of molar mass, the silic...

Embodiment 1

[0074] This example is used to illustrate the preparation of the liquid-phase alkylation catalyst of the present invention.

[0075] Mix 1.87g of aluminum sulfate, 2.02g of sodium hydroxide, 1.48g of sodium metaborate, 6.93g of hexamethyleneimine, 8.40g of white carbon black, and 61.64g of water under vigorous stirring, and age at 40°C After 6h, a white homogeneous gel was obtained. The gel was transferred to a stainless steel reactor lined with polytetrafluoroethylene, and crystallized at 140° C. for 5 days (days) in a stirring state, and the crystallization stirring speed was 200 r / min. After crystallization, water cooled to room temperature, washed, dried at 110°C for 4 hours, added 30% by weight of alumina binder, extruded, and calcined at 500°C for 6 hours to obtain granules. Put the above particles into 1mol / kg ammonium nitrate solution, the solid-to-liquid weight ratio (the weight ratio of boron-containing MWW molecular sieve to ammonium salt solvent) is 1:20, and exch...

Embodiment 2

[0079] This example is used to illustrate the preparation of the liquid-phase alkylation catalyst of the present invention.

[0080] Mix 1.87g of aluminum sulfate, 2.02g of sodium hydroxide, 2.96g of sodium metaborate, 6.93g of hexamethyleneimine, 8.40g of white carbon black, and 61.64g of water under vigorous stirring, and age at 40°C After 6h, a white homogeneous gel was obtained. The gel was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and crystallized at 140°C for 5 days under stirring, and the crystallization stirring speed was 200r / min. After crystallization, water cooled to room temperature, washed, dried at 110°C for 4 hours, added 30% by weight of alumina binder, extruded, and calcined at 500°C for 6 hours to obtain granules. Put the above particles into 1mol / kg ammonium nitrate solution, the solid-to-liquid weight ratio is 1:20, exchange twice at 30°C for 2.5 hours each time, wash, dry at 110°C for 4 hours, and place in air at...

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Abstract

The invention discloses a liquid-phase alkylation catalyst, a preparation method and an application thereof, and a method for liquid-phase alkylation reaction of benzene and ethylene. The liquid-phase alkylation catalyst comprises a molecular sieve with an MWW topological structure and a binder, based on the total weight of the liquid-phase alkylation catalyst, the content of the molecular sieve with the MWW topological structure is 50-90wt%, the content of the binder is 10-50wt%, and the pore volume of the outer surface of the liquid-phase alkylation catalyst is 0.45-0.65 cm<3> / g. The liquid-phase alkylation catalyst provided by the invention has good diffusivity and a large amount of external surface acid, so that the activity and catalytic performance of the liquid-phase alkylation catalyst can be improved, the conversion rate of liquid-phase alkylation reaction of benzene and ethylene is improved, the conversion rate of ethylene is high, the selectivity of ethyl is good, no xylene is generated, and the impurity content is low.

Description

technical field [0001] The invention belongs to the field of liquid-phase alkylation catalysts, and in particular relates to a liquid-phase alkylation catalyst, a preparation method and application thereof, and a method for liquid-phase alkylation reaction of benzene and ethylene. Background technique [0002] Ethylbenzene is an important organic chemical raw material. It is mainly used to produce styrene, and then to prepare synthetic materials such as engineering plastics and synthetic rubber. It has a wide range of uses and is of great significance to the development of the national economy. The demand is increasing year by year. The synthesis of ethylbenzene is mainly carried out through the alkylation reaction of benzene and ethylene, and the core of this technology lies in the preparation of molecular sieve materials. [0003] MWW molecular sieves are a class of catalytic materials with good liquid-phase alkylation performance (Journal of Catalysis, 2000, 192, 163–173)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J35/10C07C2/66C07C15/073
CPCB01J29/7038C07C2/66B01J2229/18C07C2529/70B01J35/60B01J35/615B01J35/617B01J35/633B01J35/635C07C15/073Y02P20/52
Inventor 沈震浩杨为民孙洪敏何俊琳由雪玲金少青陈頔
Owner CHINA PETROLEUM & CHEM CORP
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