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Ethylene and toluene catalytically separating process for preparing methyl ethyl benzene

A technology of methyl ethyl benzene and ethylene, applied in the field of low-concentration ethylene and toluene to prepare methyl ethyl benzene by phase-changing catalytic separation, which can solve problems such as insufficient benzene production

Inactive Publication Date: 2007-06-27
SYN ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third is to use low-concentration ethylene and benzene to produce ethylbenzene (Zhang Shurong, Wei Yongzhen, Wang Qingya, etc., Petroleum Refining, 1988, 11: 33-39), although it is one of the new ways to use low-concentration ethylene, but according to the survey, The production of benzene in the country is insufficient, and a large amount of imports are needed
[0003] Since Mobil Corporation (USP4117024, USP5476828, USP5698756) developed a modified ZSM-5 molecular sieve with shape-selective catalysis in the 1970s, the gas-phase alkylation reaction of toluene and pure ethylene has broken through the limit of thermodynamic equilibrium, and can obtain 90 % above the concentration of p-methylethylbenzene, and does not generate ortho-methylethylbenzene, and the traditional AlCl 3 Catalyst and hydrogen ZSM-5 zeolite, only three isomers of methyl ethyl benzene close to thermodynamic equilibrium can be obtained

Method used

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  • Ethylene and toluene catalytically separating process for preparing methyl ethyl benzene
  • Ethylene and toluene catalytically separating process for preparing methyl ethyl benzene

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Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0034] The composition (w%) of raw material toluene used: Toluene: 99.770; Benzene: 0.010; Heptane: 0.096, octane: 0.103; Ethylbenzene: 0.005, H 2 O: 0.015. The composition (v%) of the feed gas is shown in Table 1. The catalysts used are the 3994 (Y-type molecular sieve as the main component) plum blossom strip catalyst produced by Fushun Catalyst Factory, and the 4984 (beta-type molecular sieve as the main component) three-leaf Strip catalyst and 5995 (MCM-22 molecular sieve as the main component) special-shaped strip catalyst. The reaction conditions and results are shown in Table 2. It can be seen from the table that within the range of conditions investigated, the conversion rate of ethylene is above 95%, the selectivity of ethylene to ethyltoluene is 80-87%, and the selectivity of ethylated products is 93-98%.

[0035] Table 1 Composition of feed gas (V%) *

[0036]

[0037] * 1: Catalytic dry gas of Fushun Petroleum No. 2 Plant 2: Catalytic dry gas of Fush...

Embodiment 9

[0044] Adopt catalytic dry gas raw material in Table 1, fresh toluene adds hydrocarbonate as raw material, and its mixed raw material composition is as follows (w%): Benzene: 0.045; Toluene: 90.52; Ethyltoluene: 7.73; Polyethyltoluene: 1.58, Unknown 0.125. The reaction conditions and results are shown in Table 2. It can be seen from the table that under the conditions investigated, the conversion rate of ethylene is 95%, the selectivity of ethylene to ethyl toluene is ≥ 80%, and the selectivity of ethylated products is ≥ 92%.

Embodiment 10

[0046] The catalytic dry gas raw material in Table 1 is used, and 3.90w% polyethyltoluene is added to fresh toluene as the raw material. The reaction conditions and results are shown in Table 2. As can be seen from the table, under the conditions of investigation, the conversion rate of ethylene is 97.21%, and ethylene generates ethyltoluene selectivity 82.5%, if the polyethyltoluene amount added in the raw material is subtracted in the reaction product, Then the real selectivity of ethyltoluene is 99.32w%, so the reverse alkylation process of polyethyltoluene can be omitted in this way.

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Abstract

The ethylene and toluene catalyzing and separating process to prepare methyl ethyl benzene includes feeding toluene and low concentration ethylene to reaction tower separately from the upper part and the lower part, reaction in the reaction section at the boiling temperature of toluene, absorbing heat the reaction between ethylene and toluene releases with gasifying liquid toluene, and heating material toluene and material gas with the effluent of the reaction section. The present invention has material including industrial pure toluene and low concentration ethylene as the material gas in the molecular ratio of 1-10, alkanization reactions including pressure of 0.5-3.5 MPa, and temperature of 130-260 deg.c and weight space velocity of ethylene in 0.10-1.0 / hr.

Description

technical field [0001] The invention relates to a method for preparing methyl ethyl benzene, in particular to a method for preparing methyl ethyl benzene by catalytic separation of low-concentration ethylene and toluene in disguised phases. Background technique [0002] Dehydrogenation of p-methylethylbenzene can produce p-methylstyrene, which can be polymerized to produce a new type of plastic, polymethylstyrene. The polymer is superior to existing polystyrene plastics in terms of specific gravity, heat resistance, transparency and shrinkage. In addition, p-methylstyrene can be copolymerized with other monomers, which can improve the heat resistance and flame retardancy of some polymers, and can be widely used in the manufacture of engineering plastics, alkyd resin coatings, etc., so it has been widely valued (Kaeding w w, et al. Chemtech, 1982, 12(9):556). At present, the production of p-methylstyrene still uses pure ethylene (>99%) as raw material (USP4117024, 1978),...

Claims

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Application Information

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IPC IPC(8): C07C2/66C07C15/02
Inventor 徐龙伢王清遐陈福存刘盛林
Owner SYN ENERGY TECH CO LTD