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Catalyst for preparing phenylethane from dilute ethylene and benzene alkylation and method for preparing same

A benzene alkylation and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of high alkylation reaction temperature, high energy consumption, and high xylene impurity content

Active Publication Date: 2009-11-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN97106449.0, CN97106448.2, CN00111721.1 adopt alkaline earth / rare earth metal oxide modified conventional micron ZSM-5 to improve the catalyst performance to a certain extent when used for the alkylation of ethylene and benzene, but there are still alkyl groups The reaction temperature is high (400-420°C), leading to problems such as high energy consumption and high content of xylene impurities in the product
In CN96106561.3, the present inventor adopts ZSM-5 / ZSM-11 co-crystal molecular sieve as a catalyst to directly catalyze the reaction of dilute ethylene and benzene in FCC dry gas to form ethylbenzene. The catalyst has strong resistance to impurities, and the raw material of dry gas does not need to be refined in advance. , directly carry out alkylation reaction with benzene at 370-450°C, but there is also the problem of high alkylation reaction temperature

Method used

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  • Catalyst for preparing phenylethane from dilute ethylene and benzene alkylation and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The silicon-aluminum molar ratio is 25, and the ZSM-5 molecular sieve that crystal grain size is 0.7 micron is mixed with the ratio that alumina is 7: 3 with the mass ratio, adds the turmeric powder that accounts for 3.0% of dry basis weight and accounts for dry basis weight After 4% nitric acid, kneading, extruding, and roasting;

[0024] Use ammonium nitrate aqueous solution as an exchange agent to carry out ion exchange on the above-mentioned shaped samples, and turn them into hydrogen-type molecular sieves after roasting;

[0025] The above sample was treated with water vapor at 550°C for 2 hours; then treated with 0.1mol / L nitric acid solution at 70°C for 3 hours, the weight ratio of nitric acid solution to catalyst was 5, and the catalyst was dried and heated at 520°C Calcined for 2 hours to obtain catalyst A.

[0026] Under the condition that the reaction temperature is 330°C and the pressure is 0.7MPa, using the No. 1 dry gas raw material in Table 1, the ethyle...

Embodiment 2

[0028] Catalyst preparation process is the same as embodiment 1, and difference is that after acid treatment, catalyst is impregnated with La 2 o 3 A calculated amount of 1.0% lanthanum nitrate solution was dried and calcined to obtain catalyst B.

[0029] Under the condition that the reaction temperature is 330°C and the pressure is 0.7MPa, the No. 2 dry gas raw material in Table 1 is used, the ethylene content is 20.8% (volume), and the ethylene space velocity is 0.4h -1 , under the condition that the molecular ratio of benzene to ethylene is 5, the ethylene conversion rate is 99.7%, the ethylation selectivity is 99.2%, the xylene impurity content is 830ppm, and the activity of the catalyst decreases by 0.21% during 100 hours of operation.

Embodiment 3

[0034] The silicon-aluminum molar ratio is 196, and the ZSM-5 molecular sieve that grain size is 0.2 micron is mixed with silicon dioxide in the ratio of 9: 1 with the mass ratio, adds and accounts for 2.0% of dry basis weight's turmeric powder and accounts for dry basis 11% by weight of nitric acid, kneading and extruding to shape, use ammonium chloride aqueous solution as the exchanger, carry out ion exchange on the above-mentioned shaped samples, after roasting, turn them into hydrogen-type molecular sieves, and treat them with ammonia water vapor under the condition of 450°C 2 hours, wherein the concentration of ammonia water is 0.2mol / L; then treat with 0.3mol / L nitric acid solution at 50°C for 3 hours, wherein the weight ratio of nitric acid solution to catalyst is 3; the catalyst is dried and calcined at 520°C for 2 hours , Catalyst D was prepared.

[0035] Under the condition that the reaction temperature is 360°C and the pressure is 1.8MPa, the No. 2 dry gas raw mater...

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Abstract

The invention aims to provide a catalyst for preparing phenylethane from dilute ethylene and benzene alkylation and a method for preparing the same. The catalyst is characterized in that the crystal is formed by a small crystal grain ZSM-5 molecular screen with the crystal grain size of between 0.15 and 0.8 mircometer and a bonding agent of aluminum oxide and silicon dioxide, and then prepared by steps of vapor / ammonia vapor treatment and acid treatment, wherein the relative mass ratio of the ZSM-5 molecular screen to the bonding agent of the aluminum oxide and the silicon dioxide is (5-9):(1-5). When the catalyst is used for preparing the phenylethane from the dilute ethylene and the benzene alkylation in dry gas, because the crystal grain size of the used molecular screen is small, the number of acidic sites and the acidic utilization ratio of the catalyst are high, and simultaneously the pore canal of the molecular screen is short, which is favorable for dispersion of reactants and products, so that the catalyst has the characteristics of high activity, low reaction temperature, high selectivity of target products, low content of xylene impurity in the product and good satiability.

Description

technical field [0001] The invention relates to the technical field of ethylbenzene production in petrochemical industry, more specifically, a catalyst for producing ethylbenzene by alkylation reaction of dilute ethylene and benzene in the by-product dry gas of the petrochemical industry and a preparation method thereof. Background technique [0002] Ethylbenzene is an important raw material for the production of styrene, and then for the production of engineering plastics, synthetic resins, and synthetic rubber. Demand continues to grow, but most ethylbenzene is produced by reacting high-purity ethylene with benzene. [0003] With the development of the petroleum processing industry, a large amount of refinery tail gas containing lower concentration of ethylene provides a new source of raw materials for the production of ethylbenzene, making full use of various sources and different concentrations, especially low concentration ethylene and benzene Alkylation production Ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J37/10B01J37/08B01J37/00C07C15/073C07C2/66
CPCY02P20/52
Inventor 朱向学徐龙伢陈福存刘盛林王清遐谢素娟安杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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