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Process for preparing alkylbenzene with low energy consumption

A process method and technology of alkylbenzene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problem of increasing the load of transalkylation reactions in benzene towers and polyalkylbenzene towers, energy consumption of polyalkylene towers, polyalkylene Increase in benzene concentration and other problems, achieve the effect of increasing productivity, reducing the amount of benzene, and reducing the operating load

Inactive Publication Date: 2004-03-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0012] The common feature of the above-mentioned prior art is that the effluent of the alkylation reaction is not treated to recover benzene and recycle, but when the benzene / ene ratio decreases, the concentration of polyalkylated benzene increases, thus increasing the load of the transalkylation reaction and Energy consumption of benzene tower and polyalkylbenzene tower

Method used

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  • Process for preparing alkylbenzene with low energy consumption
  • Process for preparing alkylbenzene with low energy consumption
  • Process for preparing alkylbenzene with low energy consumption

Examples

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Embodiment 1

[0051] A fixed-bed reactor consisting of 7-stage alkylation catalyst AEB-2 (manufactured by Changling Catalyst Factory) beds with equal ethylene feed in each stage was simulated. The benzene / ethylene molar ratio of each bed layer is 24:1, and the total benzene / ethylene molar ratio of the eight sections is 3.4:1. Its simulation process is as follows. The first stage of bed simulation: Benzene and ethylene enter the reactor at a molar ratio of 24:1 and carry out alkylation reaction under liquid phase conditions. After the reaction is over, the catalyst is removed. Second-stage bed simulation: use the product of the first stage as raw material, reinstall the same fresh catalyst, and feed the same amount of ethylene as the previous stage. By analogy, use the product of the penultimate stage as the raw material of the last stage, reinstall the same fresh catalyst, feed the same amount of ethylene as in the previous stage, and obtain an alkylation product under the condition of a ...

Embodiment 2

[0055] Using the alkylation product obtained in Example 1 as a feed, carry out a transalkylation reaction on a polyalkylated benzene conversion catalyst AEB-1 (produced by Wenzhou Catalyst Factory) catalyst mainly composed of Y zeolite, simulating polyalkylated benzene conversion reactor. The reaction temperature is 200°C-250°C, the reaction pressure is 3.5MPa, the feed volume space velocity is 3 / h, the catalyst loading volume is 8mL, and the particle size is 20-40 mesh. The reactor is a stainless steel tube with an inner diameter of 12.5 mm, and the stream enters the reactor in an upflow mode.

[0056] The test results show that in the simulated polyalkylbenzene conversion reactor, when the reaction temperature is 220°C, the conversion rate of diethylbenzene reaches 15.41%, the conversion rate of triethylbenzene reaches 64.34%, and the selectivity of ethylbenzene is 97.77%. Overall, ethylbenzene concentrations increased and diethylbenzene and triethylbenzene concentrations ...

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Abstract

A process of manufacturing alkylbenzene with low energy consumption comprises benzen and alkene as the raw material are putting into an alkylation reactor for alkylation, alkylating products from theoutlet of the alkylation reactor entering 0-5 polyalkylbenzene transfer reactors then back to the liquid-phrase alkylation reactor; after separating, obtaining benzene, monoalkyl benzene, polyalkylbenzene and heavy componenst, some benzene is back to the alkylation reactor, the rest benzene and polyalkylbenzene entering the transalkylation reactor for transalylation, the products of transalylation and products of alkylation are separated. The method lowers the concentration of polyalkylbenzene in alkylating products, reduces operating load of a polyalkylbenzene tower and transalylation, thus saves the amount of benzene in transalylation and energy consumption.

Description

technical field [0001] The present invention relates to a method for preparing hydrocarbons from hydrocarbons containing a relatively small number of carbon atoms. More specifically, it is a method for producing alkylbenzenes from light olefins and benzene. Background technique [0002] Ethylbenzene is an important organic chemical raw material, mainly used for the production of styrene. 99% of the world's ethylbenzene is used as a raw material for styrene, and only 1% is used for other purposes, such as solvents, production of diethylbenzene and anthraquinone, etc. Therefore, the demand for ethylbenzene depends almost entirely on the production of styrene. It is predicted that between 1998 and 2005, global styrene consumption will increase at an annual rate of 4.2%, and China's styrene consumption will increase at a rate of 8.7%. Cumene is the raw material for the production of phenol and acetone. More than 90% of the installations use the cumene m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/64C07C15/02
Inventor 张凤美杜伟彦舒兴田王卫东王瑾李明林秦凤明
Owner CHINA PETROLEUM & CHEM CORP
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