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Alkylaromatics production

A technology of aromatic compounds and alkylaromatics, applied in the direction of hydrocarbons, hydrocarbons, organic chemistry, etc., can solve expensive and other problems

Inactive Publication Date: 2014-06-04
EXXONMOBIL CHEM PAT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, purification of alkylation feed streams is an expensive operation, so there is great interest in developing processes that can operate with lower grade feed streams

Method used

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  • Alkylaromatics production
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Experimental program
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Embodiment 1

[0083] Benzene and ethylene were fed to a 4-stage fixed-bed commercial reactor operated in a down-flow configuration. The catalyst is a ZSM-5 extrudate containing more than 40% zeolite. The operating conditions in this reactor were an inlet temperature of 390° C. and a pressure of 2370 kPa-a such that benzene was in the gas phase. The first reactor has a benzene:ethylene molar ratio of 6.4 and a weight hourly space velocity based on olefin feed of less than 50.0 hr-1 To achieve greater than 99.7% olefin conversion.

[0084] The effluent from the gas phase alkylation reactor contains ethylbenzene (EB) and unreacted benzene and is fed to an adsorbent containing at least one selected from Engelhard F-24 clay, zeolite 13X and Selexsorb CD alumina and maintained at about Preconditioner at a temperature of 30 °C. The treated effluent is then sent to a benzene distillation column where unreacted benzene is separated from the effluent and fed, along with additional ethylene, to a 6-...

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Abstract

A process is described for producing an alkylaromatic compound, in which a first feed comprising an alkylatable aromatic compound and a second feed comprising an alkene are introduced into a first alkylation reaction zone comprising a first alkylation catalyst. The first alkylation reaction zone is operated under conditions effective to cause alkylation of the alkylatable aromatic compound by the alkene to produce said alkylaromatic compound, the conditions being such that the alkylatable aromatic compound is at least predominantly in the vapor phase. A first effluent comprising the alkylaromatic compound and unreacted alkylatable aromatic compound is withdrawn from the first alkylation reaction zone and at least part of the unreacted alkylatable aromatic compound is treated to remove catalyst poisons therefrom and produce a treated unreacted alkylatable aromatic stream. At least part of the unreacted alkylatable aromatic compound and a third feed comprising said alkene is introduced into a second alkylation reaction zone comprising a second alkylation catalyst. The second alkylation reaction zone is operated under conditions effective to cause alkylation of the unreacted alkylatable aromatic compound by the alkene to produce said alkylaromatic compound, the conditions being such that the alkylatable aromatic compound is at least predominantly in the liquid phase. A second effluent comprising said alkylaromatic compound is withdrawn from the second alkylation reaction zone.

Description

technical field [0001] This invention relates to a process for the production of alkylaromatics, especially ethylbenzene. Background technique [0002] Ethylbenzene is a key feedstock in the production of styrene and is produced by the reaction of ethylene and benzene in the presence of an acid catalyst. AlCl 3 or BF 3 as an acidic catalyst. Newer units are often converting to use zeolite-based acidic catalysts. [0003] Ethylbenzene is traditionally produced in a gas phase reactor system in multiple fixed beds of zeolite catalyst at a temperature of about 380-420°C and 9-15 kg / cm 2 The ethylation reaction of benzene and ethylene is carried out under the pressure of -g. Ethylene reacts exothermically with benzene to form ethylbenzene, although unwanted chain reactions and side reactions also occur. About 15% of the ethylbenzene formed is further reacted with ethylene to form diethylbenzene isomers (DEB), triethylbenzene isomers (TEB) and heavier aromatic products. All...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C15/073
CPCC07C2/66C07C15/073C07C15/02
Inventor M·C·克拉克V·南达M·班达卡J·C·彼得斯齐君明B·梅尔兹
Owner EXXONMOBIL CHEM PAT INC