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Two zeolite-containing catalyst for ethene and benzene alkylation, and preparation method and application thereof

A technology for benzene alkylation and catalyst, which is applied to the catalyst for preparing ethylbenzene by the alkylation reaction of low-concentration ethylene and benzene and the field of preparation thereof, and can solve the problem of high xylene impurity content, high alkylation reaction temperature and high reaction temperature problem, to achieve the effect of reducing carbon deposition reaction, low reaction temperature and high activity

Active Publication Date: 2015-04-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN97106449.0, CN97106448.2 and CN00111721.1 adopt the conventional ZSM-5 zeolite modified by alkaline earth / rare earth metal oxides to improve the catalyst performance to a certain extent when used for the alkylation of ethylene and benzene, but there is still alkylation The reaction temperature is high (400~420°C), resulting in high energy consumption and high content of xylene impurities in the product, etc.
And CN101584993A modified ZSM-5 zeolite by special conditions, improved the performance of catalyst to a certain extent, but the relatively high problem of alkylation reaction temperature still exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation process of the catalyst E-1 of the present invention is as follows:

[0030] (1) Configure 0.5mol / L phosphoric acid aqueous solution, and then adopt equal volume immersion method with BETA (SiO 2 / Al 2 O 3 The molar ratio is 28) and ZSM-5 (SiO 2 / Al 2 O 3 The molar ratio is 75). The two hydrogen molecular sieves are evenly mixed (the mass ratio is 8:1). After being immersed at 80°C for 2 hours, they are dried at 120°C and roasted in air at 550°C for 5 hours to obtain BETA and ZSM-5 modifications. The molecular sieve is denoted as S-1, and the weight content of phosphorus in the zeolite is 1.5%.

[0031] (2) Mix the modified molecular sieve S-1 and alumina powder obtained in step (1) on a dry basis of 60:40, and then add 100ml of water and 2.5ml of concentrated nitric acid (with a mass concentration of 66.5%). Kneading to make it into a paste-like plastic, extruding a cylindrical bar with a diameter of 1.5mm on an extruder, drying the cylindrical bar at 100°C ...

Embodiment 2

[0034] Preparation of catalyst E-2 of the present invention

[0035] (1) Configure 0.5mol / L ammonium dihydrogen phosphate aqueous solution, and then use equal volume immersion method with BETA (SiO 2 / Al 2 O 3 The molar ratio is 28) and ZSM-5 (SiO 2 / Al 2 O 3 The molar ratio is 75) The two hydrogen molecular sieves are evenly mixed (the mass ratio is 5:1). After immersing at 80°C for 2 hours, they are dried at 120°C and roasted in air at 550°C for 5 hours to obtain BETA and ZSM-5 modified The molecular sieve is denoted as S-2, and the weight content of phosphorus in the zeolite is 2.5%.

[0036] (2) Mix the modified molecular sieve S-2 and alumina powder obtained in step (1) on a dry basis of 20:80, and then add 100ml of water and 2.5ml of concentrated nitric acid (the mass concentration is 66.5%), fully Kneading to make it into a paste-like plastic, extrude a cylindrical strip with a diameter of 1.5mm on an extruder, dry the cylindrical strip at 100°C for 16 hours, and then calcin...

Embodiment 3

[0039] Preparation of catalyst E-3 of the present invention

[0040] The preparation process of the catalyst E-3 of the present invention is the same as that of Example 1, except that the ethanol solution of triethyl phosphate is used instead of the aqueous phosphoric acid solution. The evaluation results of the prepared catalyst E-3 of the present invention are shown in Table 2.

[0041] (1) Configure a 1.0mol / L ethyl phosphate ethanol solution, and then use an equal volume immersion method with BETA (SiO 2 / Al 2 O 3 The molar ratio is 58) and ZSM-5 (SiO 2 / Al 2 O 3 The molar ratio is 105) The two hydrogen molecular sieves are evenly mixed (the mass ratio is 8:1). After immersing at 80°C for 2 hours, they are dried at 120°C and roasted in air at 550°C for 5 hours to obtain BETA and ZSM-5 modifications. The molecular sieve is denoted as S-3, and the weight content of phosphorus in the zeolite is 5.0%.

[0042] (2) Mix the modified molecular sieve S-3 and alumina powder obtained in st...

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PUM

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Abstract

The invention discloses a two zeolite-containing catalyst for ethene and benzene alkylation, and a preparation method and an application thereof. The catalyst comprises a phosphor-modified BETA zeolite, a phosphor-modified ZSM-5 zeolite and a rare earth metal oxide. On the basis of the weight of the catalyst, the total content of the phosphor-modified BETA zeolite and the phosphor-modified ZSM-5 zeolite is 10%-90.0%; the content of the rare earth metal oxide is 1%-20%; and the balance is an inorganic refractory oxide, wherein the weight content ratio of the phosphor-modified BETA zeolite to the phosphor-modified ZSM-5 zeolite is 1 : 10-10 : 1. The catalyst provided by the invention is used for alkylation reactions of benzene and ethylene, and has higher reaction activity and selectivity.

Description

technical field [0001] The invention discloses a catalyst for preparing ethylbenzene by the alkylation reaction of ethylene and benzene and its preparation method and application. Catalyst of ethylbenzene and its preparation method and application. Background technique [0002] Ethylbenzene is an important organic chemical raw material with a wide range of uses. It is the raw material for the production of styrene. It can also be used to produce ion exchange resins, unsaturated polyester resins, agricultural emulsifiers and coatings, etc., in automobiles, household appliances, light industry and other fields have broad application prospects. Styrene ranks third in the production of polyolefin monomers in the world, and has developed rapidly in recent years. The strong market demand for styrene has driven the continuous growth of ethylbenzene production. Therefore, it is of great significance to open up new sources of all raw materials in ethylbenzene production and find ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C15/073C07C2/66
CPCY02P20/52
Inventor 徐会青刘全杰贾立明王伟
Owner CHINA PETROLEUM & CHEM CORP