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Catalyst used in alkylation reaction of ethylbenzene and ethanol and preparation method thereof

A technology for ethanol alkylation reaction, applied in the field of catalyst for ethylbenzene and ethanol alkylation reaction and its preparation field, can solve the problem that catalyst activity stability is not mentioned, catalyst preparation cost is high, diethylbenzene selectivity is low, etc. problem, to achieve excellent catalytic performance, excellent reaction performance, and the effect of inhibiting transalkylation

Active Publication Date: 2016-03-09
JIANGSU EVERGREEN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of ethylbenzene and ethanol reaction involved in the above-mentioned patents or publications generates p-xylene, the main catalyst that adopts is generally ZSM-5 or modified ZSM-5, and the problem of low selectivity to diethylbenzene generally exists, and there are The patent discloses the use of a new type of molecular sieve as an alkylation catalyst to produce p-diethylbenzene with high selectivity, but the disadvantage may be that the catalyst preparation cost is relatively high, and the activity stability of the catalyst is not mentioned.

Method used

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  • Catalyst used in alkylation reaction of ethylbenzene and ethanol and preparation method thereof
  • Catalyst used in alkylation reaction of ethylbenzene and ethanol and preparation method thereof
  • Catalyst used in alkylation reaction of ethylbenzene and ethanol and preparation method thereof

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Embodiment 1

[0030]The catalyst of this embodiment is mainly made of the following raw materials in weight percentage: 10% of alumina, 90% of modified hydrogen ZSM-5 / ZSM-11 molecular sieve; the modified hydrogen ZSM-5 / ZSM-11 molecular sieve is Hydrogen-type ZSM-5 / ZSM-11 molecular sieve modified by citric acid, SiO of hydrogen-type ZSM-5 / ZSM-11 molecular sieve modified before 2 / Al 2 o 3 The molar ratio is 80, and the grain size is 0.8 μm to 1 μm; the preparation process of the modified hydrogen ZSM-5 / ZSM-11 molecular sieve is as follows: the hydrogen ZSM-5 / ZSM-11 is treated with citric acid solution at 85°C Molecular sieve carries out acid treatment 4h, obtains modified hydrogen type ZSM-5 / ZSM-11 molecular sieve; The mass concentration of described citric acid solution is 1.0%, and the mass ratio of citric acid solution and hydrogen type ZSM-5 / ZSM-11 molecular sieve is 6:1.

[0031] The specific preparation process of the catalyst in this example is: kneading alumina, modified hydrogen ...

Embodiment 2

[0042] The catalyst of this embodiment is mainly made of the following raw materials in weight percentage: 20% of alumina, 80% of modified hydrogen ZSM-5 / ZSM-11 molecular sieve; the modified hydrogen ZSM-5 / ZSM-11 molecular sieve is Hydrogen type ZSM-5 / ZSM-11 molecular sieve modified by citric acid, SiO of modified hydrogen type ZSM-5 / ZSM-11 eutectic molecular sieve 2 / Al 2 o 3 The molar ratio is 60, and the grain size is 0.5 μm to 1 μm; the preparation process of the modified hydrogen ZSM-5 / ZSM-11 molecular sieve is as follows: the hydrogen ZSM-5 / ZSM-11 is treated with citric acid solution at 80°C Molecular sieves were subjected to acid treatment for 5 hours to obtain modified hydrogen ZSM-5 / ZSM-11 eutectic molecular sieves; the mass concentration of the citric acid solution was 0.8%, and the citric acid solution was mixed with hydrogen ZSM-5 / ZSM-11 The mass ratio of crystal molecular sieve is 8:1.

[0043] The specific preparation process of the catalyst in this example is...

Embodiment 3

[0048] The catalyst of this embodiment is mainly made of the following raw materials in weight percentage: 30% of alumina, 70% of modified hydrogen ZSM-5 / ZSM-11 eutectic molecular sieve; the modified hydrogen ZSM-5 / ZSM-11 The eutectic molecular sieve is the hydrogen ZSM-5 / ZSM-11 molecular sieve modified by citric acid, and the SiO of the hydrogen ZSM-5 / ZSM-11 eutectic molecular sieve is modified. 2 / Al 2 o 3 The molar ratio is 90, and the grain size is 0.5 μm to 1 μm; the preparation process of the modified hydrogen ZSM-5 / ZSM-11 molecular sieve is as follows: the hydrogen ZSM-5 / ZSM-11 is treated with citric acid solution at 90°C The eutectic molecular sieve was acid-treated for 3 hours to obtain a modified hydrogen ZSM-5 / ZSM-11 eutectic molecular sieve; the mass concentration of the citric acid solution was 1.2%, and the citric acid solution and the hydrogen ZSM-5 / ZSM- The mass ratio of 11 eutectic molecular sieves is 5:1.

[0049] The specific preparation process of the ca...

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Abstract

The present invention discloses a catalyst in an alkylation reaction of ethylbenzene and ethanol. The catalyst comprises the following raw materials in percentages by weight: 10%-30% of aluminum oxide, and 70%-90% of a modified hydrogen form eutectic crystallization ZSM-5 / ZSM-11 molecular sieve; and the modified hydrogen form eutectic crystallization ZSM-5 / ZSM-11 molecular sieve is a citric acid modified hydrogen form ZSM-5 / ZSM-11 molecular sieve. Moreover, the present invention also discloses a preparation method of the catalyst. The method comprises the following steps: firstly, kneading the raw materials and baking the raw materials to obtain a mixture; and secondly, roasting the mixture in steam atmosphere to obtain the catalyst. The catalyst disclosed by the present invention is used in the alkylation reaction of ethylbenzene and ethanol to prepare p-diethylbenzene, a high ethylbenzene (ethanol) conversion rate can be obtained, side reactions such as transalkylation can be greatly suppressed, and the selectivity of reaction products diethylbenzene and p-diethylbenzene are improved.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and in particular relates to a catalyst for the alkylation reaction of ethylbenzene and ethanol, a preparation method and application thereof. Background technique [0002] P-diethylbenzene is an important organic chemical raw material, mainly used as a special desorbent in the p-xylene separation process of p-xylene production equipment, and can also be used to produce divinylbenzene, which is further used in ion exchange resins, synthetic rubber di Modifiers for vinylbenzene and polystyrene, polymerized monomers for unsaturated polyester fiberglass, etc. [0003] There are two main processes for the production of p-diethylbenzene. The separation process uses rectification to purify p-diethylbenzene products from mixed diethylbenzene (PDX+ODX+MDX). The separation energy consumption is high, and the purity is difficult to reach greater than 95%. requirements. At present, the ind...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C2/86C07C15/02
CPCC07C2/864B01J21/04B01J29/80C07C2529/40B01J29/40B01J35/19C07C15/02
Inventor 孙秋新
Owner JIANGSU EVERGREEN NEW MATERIAL TECH
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