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Preparation method of high-selectivity benzene alkylation catalyst

A benzene alkylation, high-selectivity technology, used in carbon compound catalysts, catalysts, physical/chemical process catalysts, etc., can solve the problems of affecting the purity of styrene downstream products, limiting the scope of application, and not being well solved. Achieve the effect of slowing down the coking inactivation rate, prolonging the operation period and reducing the probability of occurrence

Active Publication Date: 2018-06-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the small amount of xylene impurities generated by this side reaction will affect the purity of downstream products of styrene, limiting its application range
[0003] The preparation method of the benzene alkylation catalyst disclosed by the existing patent does not solve the above problems well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The catalyst for the alkylation of benzene and ethanol was prepared by using MFI zeolite molecular sieve with high silicon-aluminum ratio as the matrix. The silicon-aluminum ratio of MFI zeolite molecular sieve is 800, and the grain size is between 200-300 nanometers. The hydrothermal synthesis of the above-mentioned molecular sieves is carried out according to the method disclosed in the patent ZL201110364516.0 (a synthesis method of ZSM-5 zeolite). The extrusion molding of the above-mentioned zeolite molecular sieve adopts the acidified silicon ester hydrolyzate as the binder. The silicone grease hydrolysis conditions are: the silicone grease / water ratio is 1.0, the hydrolysis pH value is -1 Under certain conditions, the conversion rate of ethanol is greater than 99%. The product of reacting for 24 hours was analyzed and calculated, and the result showed that among the C8 aromatic products, the proportion of xylene impurities in the main ethylbenzene product was 350p...

Embodiment 2

[0036] Repeat Example 1, but use the above catalyst for the gas-phase alkylation of benzene and methanol at a reaction temperature of 400 °C, a reaction pressure of 1.0 MPa, a benzene / methanol molar ratio of 2, and a total feed space velocity of 2 h -1 Under certain conditions, the methanol conversion rate is greater than 99%. The product reacted for 48 hours was analyzed and calculated, and the result showed that in the C8 aromatic hydrocarbon product, the percentage of ethylbenzene impurity in the xylene main product was 8.3%.

Embodiment 3

[0038] Repeat Example 1, but the silicon-aluminum ratio of the high-silicon-aluminum ratio MFI zeolite molecular sieve used is 600, and the grain size is between 200-300 nanometers. The hydrothermal synthesis of the above-mentioned molecular sieves is carried out according to the method disclosed in the patent ZL201110364516.0 (a synthesis method of ZSM-5 zeolite). The above catalyst was used in the gas phase alkylation reaction of benzene and ethanol. When the reaction temperature is 400°C, the reaction pressure is 1.0MPa, the benzene / ethanol molar ratio is 4, and the ethanol feed space velocity is 0.7h -1 Under certain conditions, the conversion rate of ethanol is greater than 99%. The product of reacting for 24 hours was analyzed and calculated, and the result showed that among the C8 aromatic products, the proportion of xylene impurities in the main product of ethylbenzene was 420ppm.

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Abstract

The invention belongs to the technical field of a petrochemical industry catalyst and provides a preparation method of a high-selectivity benzene alkylation catalyst. The preparation method comprisesthe following steps: of step 1: selecting an MFI zeolite molecular sieve with a high silicon-aluminum ratio as a parent body of the catalyst; step 2: extruding and molding hydrolysate of acidified silicone grease and the MFI zeolite molecular sieve with the high silicon-aluminum ratio; then treating the molded MFI zeolite molecular sieve with the high silicon-aluminum ratio by utilizing a separated mother solution obtained by hydrothermally crystallizing the MFI zeolite molecular sieve with the high silicon-aluminum ratio; step 3: converting the MFI zeolite molecular sieve with the high silicon-aluminum ratio, which is treated by the mother solution, into a hydrogen type alkylation catalyst by adopting an ion exchange method. According to the preparation method provided by the invention,the smother solution generated by hydrothermally synthesizing the MFI zeolite molecular sieve with the high silicon-aluminum ratio is used for treating the molded strip-shaped catalyst, so that usefulcomponents in the mother solution are recycled and a pore channel of the catalyst is dredged; environment pollution in a whole production chain of the alkylation catalyst is also reduced.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and relates to a preparation method of a benzene alkylation catalyst. Background technique [0002] The gas-phase alkylation of benzene, methanol and ethanol can be used to synthesize xylene and ethylbenzene respectively, the former can be used to produce p-xylene, and then produce terephthalic acid; the latter can be used for dehydrogenation to produce styrene, and then produce polyphenylene vinyl etc. Because of the generation of water, the alkylation of benzene and methanol, and benzene and ethanol can only be carried out under high temperature and gas phase reaction conditions, so the following common problems are faced: how to reduce the mutual isomerization side effects between xylene and ethylbenzene reaction. That is to say, in the alkylation of benzene and methanol, it is necessary to minimize the further isomerization reaction of the target product xylene to the by-pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C2/86C07C15/073C07C15/08
CPCB01J29/40B01J2229/32C07C2/864C07C2529/40C07C15/073C07C15/08Y02P20/52
Inventor 郭洪臣钱吉祝全仁刘春燕刘家旭易颜辉郭益铜
Owner DALIAN UNIV OF TECH
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