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Alkylbenzene production method

A production method and technology of alkyl benzene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of high energy consumption and unreasonable process flow, reduce investment, reduce energy consumption, improve The effect of technical effects

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there is an unreasonable technological process in the production of alkylbenzene in the prior art, and the alkylation reaction product containing only a small amount of alkane is first separated by a dealkylation tower, and then passed through a benzene tower, alkane Alkylbenzene products are obtained only through base benzene towers, and the resulting problem of high energy consumption provides a new production method for alkyl benzene

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Embodiment 1

[0026] Chemical-grade propylene with a molar concentration of 95% and benzene with a mass concentration of 99.8% are used as raw materials. figure 2 Process technology to produce cumene. Alkylation and transalkylation catalysts use Beta zeolite as the catalyst. The molar content of propane in the reaction product after the alkylation reaction of benzene and propylene is 2.5%. The benzene tower adopts 60 layers of floating valve trays, the operating pressure at the top of the tower is 0.25MPa (g), the control temperature of the decondenser at the top of the tower is 110°C, and the non-condensable gas is discharged from the reflux tank of the benzene tower, wherein the molar concentration of propane is 22.6%. Benzene molar concentration is 72.5%, other non-aromatic 4.9 mol%. The material enters the bottom of the non-aromatic tower. The non-aromatic tower adopts 15 layers of valve trays. The operating pressure at the top of the tower is 0.2MPa (g). The molar concentration of ...

Embodiment 2

[0028] The production process of cumene is the same as in Example 1, and the propylene with a molar concentration of 99.5 mol% and benzene with a mass concentration of 99.8% are used as raw materials. Alkylation and transalkylation catalysts use MCM-56 molecular sieves as catalysts. The molar content of propane in the reaction product after the alkylation reaction of benzene and propylene is 0.25%. The benzene tower adopts 65 layers of floating valve trays, the operating pressure at the top of the tower is 0.25MPa(g), the temperature of the decondenser at the top of the tower is controlled at 110°C, and the gas containing propane is discharged from the reflux tank of the benzene tower into the de-aromatic tower. The content of propane in the gas phase material is 14.4 mol%, the content of benzene is 64.9 mol%, and the content of other non-aromatics is 20.78 mol%. The material enters the bottom of the non-aromatic tower. The non-aromatic tower adopts 15 layers of valve trays. ...

Embodiment 3

[0030] The production process of cumene is the same as in Example 1, and the propylene with a molar concentration of 80 mol% and benzene with a mass concentration of 99.8% are used as raw materials. Alkylation and transalkylation catalysts use MCM-56 molecular sieves as catalysts. The molar content of propane in the reaction product after the alkylation reaction of benzene and propylene is 11.4%. The benzene tower adopts 60 layers of floating valve trays, the operating pressure at the top of the tower is 0.22MPa(g), and the temperature of the decondenser at the top of the tower is controlled at 100°C. The gas containing propane is discharged from the reflux tank of the benzene tower and enters the absorption tower. The propane content is 41.1mol%, the benzene content is 56.9mol%, and the other non-aromatic is 2.0mol%. This material enters the non-aromatizing tower, and the operating pressure of the non-aromatizing tower top is 0.15MPa (g), and the molar concentration of propa...

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Abstract

The present invention relates to an alkylbenzene production method, and is mainly to solve the problem of high energy consumption in the prior art. The present invention comprises the following steps: (1) feeding benzene and olefin into an alkylation reactor, and feeding an alkylation reaction liquid into a benzene column; (2) feeding benzene and polyalkylbenzene into a transalkylation reactor, feeding transalkylation reaction product into the benzene column; (3) feeding noncondensable gas-containing gas phase from the benzene column top into a non-aromatic hydrocarbon removing tower, and introducing tower bottom substances into an alkylbenzene tower; (4) discharging alkane-containing non-condensable gas from the non-aromatic hydrocarbon removing tower top, returning the benzene-containing material from the tower bottom to the benzene column; (5) obtaining the alkylbenzene product from the alkylbenzene tower top, feeding the material in the tower bottom to the polyalkylbenzene tower; and (6) recycling polyalkylbenzene obtained from the multi-alkylbenzene tower top or side line to the transalkylation reactor. The technical solution solves the problem well, and can be applied to the industrial production of alkylbenzene from benzene and olefin alkylation.

Description

technical field [0001] The present invention relates to a kind of production method of alkylbenzene, especially the method for producing ethylbenzene and cumene. Background technique [0002] Ethylbenzene and cumene in alkylbenzene are important organic chemical raw materials. Among them, ethylbenzene is mainly used as a raw material for the preparation of styrene, and cumene is mainly used for the production of phenol and acetone. [0003] The traditional methods of preparing ethylbenzene and cumene in industry all use solid phosphoric acid, aluminum trichloride or hydrofluoric acid series catalysts. Due to the serious corrosion of equipment and many wastes, most of them have been used as environmental protection requirements. Replaced by a new molecular sieve method. At present, the production of alkylbenzene has turned to the use of highly selective molecular sieve catalysts, including large-pore molecular sieves Y, beta, MCM series and medium-pore ZSM series. [0004] ...

Claims

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Application Information

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IPC IPC(8): C07C15/02C07C2/66C07C6/12C07C7/04C07C7/09C07C15/073C07C15/085
Inventor 杨卫胜宗弘元张忠群李木金
Owner CHINA PETROLEUM & CHEM CORP
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