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Alkylation method with catalyst combination loading

A catalyst and combined packaging technology, applied in the field of alkylation, can solve the problems of affecting the purity of ethylbenzene products, high reaction temperature, and many by-products, etc., and achieve the effects of facilitating long-term operation, prolonging the life of the catalyst, and improving the use efficiency

Active Publication Date: 2009-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

This method reaction temperature is higher, and by-product is many, influences ethylbenzene product purity

Method used

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  • Alkylation method with catalyst combination loading
  • Alkylation method with catalyst combination loading

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Embodiment

[0029] This example illustrates the method provided by the invention.

[0030] Such as figure 1 As shown, the alkylation reactor has an inner diameter of 12.5mm stainless steel tube, the catalyst particle size is 20-40 mesh. The alkylation reactor is filled with 3 catalyst beds from bottom to top, bed I is filled with catalyst AEB-2 (catalyst containing β molecular sieve), bed II is filled with catalyst MEB-1 (catalyst containing MCM-22 molecular sieve) , Bed III is loaded with catalyst AEB-1 (catalyst containing Y-type molecular sieve), and the filling ratio is 3:2:2. The physicochemical properties of the catalysts are listed in Table 1.

[0031] The reaction raw material flows into the reactor from the bottom of the reactor, and the raw material ethylene is divided into two parts, one part is mixed with benzene and introduced into the reactor from the bottom of the reactor, and the other part is introduced into the reactor from the lower part of bed II, and mixed with th...

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Abstract

The invention provides an alkylation method for the combined filling of catalysts. The method comprises the following steps that raw material benzene and raw material olefin are introduced into an alkylation reactor, pass through a catalyst bed layer from top to bottom or from bottom to top, and react to form alkyl benzene under the conditions of alkylation. The alkylation reactor comprises more than two reaction zones, and more than one reaction zone is filled with more than two catalysts. Each reaction zone is filled according to the order of a catalyst A, a catalyst B and a catalyst C along the direction of feeding flow, wherein the catalyst A is a catalyst containing beta molecular sieves; the catalyst B is a catalyst containing MCM-22 molecular sieves; and the catalyst C is a catalyst containing beta molecular sieves or Y molecular sieves. The method provided by the invention allows different types of alkylation catalysts to react under respective optimized operation conditions, can give full play to the catalytic performances and synergistic effects of the catalysts, increase the selectivity and yield of mono-alkyl benzene, reduce the generation of butylbenzene and diphenylethane which are by-products, and prolong the service life of the catalysts.

Description

technical field [0001] The present invention relates to a kind of alkylation method, more particularly, relates to a kind of alkylbenzene production method. Background technique [0002] Ethylbenzene and cumene are important organic chemical raw materials. The main use of ethylbenzene is to produce styrene by catalytic dehydrogenation, accounting for about 90% of the production capacity of styrene. In recent years, the use of styrene has been expanding and the demand is increasing. In 2005, the total output of styrene in the world has increased to 27.61 million tons per year. Cumene is mainly used in the production of important petrochemical products phenol and acetone. At present, molecular sieves are mostly used as catalysts in the industry to produce ethylbenzene and cumene, and there are two methods: molecular sieve gas phase method and molecular sieve liquid phase method. Among them, the molecular sieve liquid phase method to produce alkylbenzene has the characterist...

Claims

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Application Information

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IPC IPC(8): C07C2/66C07C15/02B01J29/06
CPCY02P20/52
Inventor 杜伟彦王瑾张凤美舒兴田王卫东秦凤明
Owner CHINA PETROLEUM & CHEM CORP
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