Method for preparing styrene by ethylbenzene dehydrogenation

A technology for producing styrene by dehydrogenation of ethylbenzene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low potassium catalyst strength, poor stability, uneconomical production of styrene, etc. , to achieve the effect of enhancing self-regeneration ability, accelerating speed and high strength
CN102040463BActive Publication Date: 2012-10-10CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2012-10-10

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Abstract

The invention relates to a method for preparing styrene by ethylbenzene dehydrogenation, which is mainly used for solving the problem of uneconomical styrene production due to inadequate strength of low-potassium catalyst and low stability under the condition of low water ratio. The technical scheme adopted by the invention is as follows: ethylbenzene, which is used as the raw material, contacts the catalyst to react to generate styrene under the conditions that the ethylbenzene airspeed is 0.5-3.0 h<-1>, the weight ratio of water to ethylbenzene is 1.0-4.0, the reaction temperature is 570-645 DEG C, and the reaction pressure is 0-20 KPa; and the catalyst is prepared by adding a rubidium compound and at least one of medium rare earth oxides comprising Pm2O3, Eu2O3, Gd2O3 and Dy2O3 into the ferrum-potassium-cerium-tungsten-calcium catalytic system, thus the problem of uneconomical styrene production is preferably solved, and the method provided by the invention can be used for preparing styrene by ethylbenzene dehydrogenation in an industrial production mode.
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Description

technical field

[0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique

[0002] The main reaction for the dehydrogenation of ethylbenzene is C 6 h 5 -C 2 h 5 →C 6 h 5 CH=CH 2 +H 2 +124KJ / mol. From a thermodynamic point of view, reducing the partial pressure of ethylbenzene is beneficial to the balance, so water vapor is usually added in industry to promote the reaction to move toward the product. The latest development trend of ethylbenzene dehydrogenation to styrene technology is to reduce raw material consumption and improve energy efficiency. The latent heat of vaporization of water is very large, and the styrene production process consumes a large amount of superheated steam as the dehydrogenation medium, which makes the process consume a lot of energy and the production cost remains high. It is an urgent need for styrene plants, especially large-scale styrene plants, to develop low water ratio catal...

Claims

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