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Method for preparing ethylbenzene by ethylene-containing reaction gas gas-phase method

A technology of reaction gas and gas phase method, which is applied in the gas-phase alkylation of dilute ethylene and benzene to prepare ethylbenzene, and the field of ethylene-containing reaction gas can solve the problems of low selectivity of ethylbenzene, high energy consumption of the device, and high selectivity of by-products. , to reduce the reaction temperature

Active Publication Date: 2021-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The dilute ethylene vapor-phase alkylation technology involved in the above-mentioned technologies to produce ethylbenzene has its own characteristics, but it is generally necessary to react at a relatively high reaction temperature. Between 350-500°C, it leads to problems such as low selectivity of ethylbenzene, high selectivity of by-products in the product, high content of xylene in ethylbenzene, and large energy consumption of the device.

Method used

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  • Method for preparing ethylbenzene by ethylene-containing reaction gas gas-phase method

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Embodiment approach

[0022] Although the purpose of the present invention can be achieved as long as the IMF structure molecular sieve with the acid distribution characteristics and silicon-aluminum ratio described in the present invention is used, according to a specific embodiment of the present invention, the IMF structure molecular sieve is H-IM -5 molecular sieves.

[0023] According to the present invention, the H-IM-5 molecular sieve can be obtained by methods known to those skilled in the art. Specifically, Na-IM-5 molecular sieve can be obtained by ammonium exchange, drying and deamination roasting by methods well known to those skilled in the art. Wherein, the conditions of the ammonium exchange include: the temperature can be 0-100°C, and the water-soluble ammonium salt in the ammonium salt exchange can be selected from one of ammonium chloride, ammonium oxalate, ammonium nitrate, ammonium sulfate or ammonium citrate or Various. The concentration of the ammonium salt solution and the ...

Embodiment 1

[0058] 10g of Na-IM-5 molecular sieve and 100ml of 0.5N ammonium nitrate solution were exchanged for sodium ion three times at 80°C for 2 hours each time. Washing with water, drying at 100°C, and calcining at 550°C for 5 hours to obtain H-IM-5 molecular sieve, the molecular sieve Na 2 The O content is less than 0.05% by weight. The above-mentioned molecular sieves are made into 20-40 mesh granules through tablet sieves to obtain H-IM-5 catalyst Cat-A.

[0059] The resulting H-IM-5 catalyst was measured at 200°C in pyridine infrared as the ratio of the amount of B acid to the amount of L acid was 4, the density of B acid was 300 μmol / g, the density of alumina in molecular sieve was 0.4 mmol / g, SiO 2 / Al 2 o 3 for 40.

[0060] Catalyst Cat-A was used to carry out the gas-phase alkylation reaction of dilute ethylene and benzene on the fixed-bed reaction evaluation device. The alkylation reaction conditions are the same as in Comparative Example 1, and the reaction results ar...

Embodiment 2

[0062] 20g of Na-IM-5 molecular sieves and 200ml of 0.5N ammonium nitrate solution were exchanged for sodium ion three times at 80°C for 2 hours each time. Washing with water, drying at 100°C, and calcining at 550°C for 5 hours to obtain H-IM-5 molecular sieve. Mix the above 10g of H-IM-5 molecular sieve with 50ml of 0.01N fluosilicic acid solution and 100ml of 0.1N sulfuric acid solution and treat at 80°C for 8h, then filter, wash with water, dry at 100°C for 12h, 550°C ℃ roasting for 5 hours, the prepared acid-treated H-IM-5 molecular sieve Na 2 The O content is less than 0.05% by weight. The above-mentioned molecular sieves are made into 20-40 mesh granules through tablet sieves to obtain acid-treated H-IM-5 catalyst Cat-B.

[0063] The resulting acid-treated H-IM-5 catalyst measured at 200°C the ratio of the amount of pyridine infrared B acid to the amount of L acid was 3.9, the density of B acid was 110 μmol / g, and the density of alumina in the IMF structure molecular s...

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Abstract

The invention relates to the field of petrochemical industry, and discloses a method for preparing ethylbenzene by an ethylene-containing reaction gas gas-phase method, which comprises the following steps: in the presence of a catalyst containing an IMF structure molecular sieve and under alkylation reaction conditions, carrying out contact reaction on an ethylene-containing reaction gas and benzene; wherein the silica-alumina molar ratio of the IMF structure molecular sieve is SiO2 / Al2O3 of 20-300, the ratio of pyridine infrared B acid amount to L acid amount of the IMF structure molecular sieve measured at 200 DEG C is 1.5-7, the density of B acid is 50-300 [mu] mol / g, and the density of alumina in the IMF structure molecular sieve is 0.1-0.5 mmol / g. According to the method provided by the invention, the IMF structure molecular sieve is used as the catalyst, so that the reaction temperature of ethylbenzene prepared by an ethylene-containing reaction gas phase method can be greatly reduced, the selectivity of ethylbenzene is improved, and the content of xylene in a product is obviously reduced.

Description

technical field [0001] The invention belongs to the field of petrochemical industry. Specifically, the invention relates to a method for preparing ethylbenzene by gas-phase method of reaction gas containing ethylene. More specifically, the invention relates to a reaction gas containing ethylene, especially dilute ethylene and benzene gas-phase alkyl. Method for the preparation of ethylbenzene. Background technique [0002] The scale of catalytic cracking units in my country ranks second in the world, producing a large amount of catalytic cracking dry gas. In addition, there are a large number of catalytic cracking devices in my country, which also produce a large amount of catalytic cracking dry gas. Catalytic cracking dry gas and catalytic cracking dry gas are collectively referred to as catalytic dry gas. The volume fraction of ethylene in the dry gas is usually 12-25%. In addition to ethylene, the catalytic dry gas also contains a small amount of H 2 , CO, CO 2 、H 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C15/073
CPCY02P20/52
Inventor 翟云平王永睿陈俊文罗一斌舒兴田王瑾
Owner CHINA PETROLEUM & CHEM CORP
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