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Method for producing styrene by dehydrogenation of ethylbenzene

A technology for the dehydrogenation of ethylbenzene and styrene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of short service life, low styrene selectivity, and low catalyst strength

Active Publication Date: 2015-08-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of low selectivity, low catalyst strength and short service life in the production of styrene, and a method for preparing styrene by dehydrogenation of ethylbenzene is provided

Method used

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  • Method for producing styrene by dehydrogenation of ethylbenzene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] respectively with Ce(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O is the raw material, and the solution is prepared according to the ratio of n(Ce):n(Fe) 1:1. Slowly add 0.1 mol L dropwise to the mixed solution under vigorous stirring - 1 NaOH solution, adjust its pH value to 10, and filter after standing for a while. The precipitate was washed with water and alcohol, and then dried in a drying oven for 24 hours. After drying, bake at 800 ℃ for 6 hours to prepare a spare sample; 240 grams of iron oxide red, 200 grams of CeO 2 -Fe 2 o 3 Composite oxide, 50 grams of potassium carbonate, 5 grams of ammonium molybdate, 7 grams of magnesium oxide and 80 grams of deionized water are mixed, kneaded for 1 hour, extruded into particles of 3 mm and 5 to 8 mm in length, dried at 800 ℃ for 4 hours to obtain the finished catalyst.

[0025] Catalyst at normal pressure, liquid space velocity 1.0 hours -1 , reaction temperature of 620°C, and water ratio (water / ethylbenzene) of 2.0 ...

Embodiment 2

[0027] The catalyst is prepared according to the method of Example 1, the difference is that CeO 2 -Fe 2 o 3 Composite oxides were prepared using Ce(NO 3 ) 2 ·6H 2 O and FeSO 4 ·7H 2 O is the raw material. The activity evaluation was carried out according to the conditions of Example 1, and the evaluation results are shown in Table 1.

Embodiment 3

[0029] The catalyst is prepared according to the method of Example 1, the difference is that the added Ce(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O is 220 grams for the amount of raw material. The activity evaluation was carried out according to the conditions of Example 1, and the evaluation results are shown in Table 1.

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Abstract

The invention relates to a method for producing styrene through ethylbenzene dehydrogenation and mainly aims to solve the problems of low styrene selectivity, low catalyst strength and short catalyst service cycle existing in the traditional method. The problems are better solved through the technical scheme that a catalyst precursor cerium-ferrum composite oxide is prepared by using a coprecipitation method, and then, a ferrum-potassium-cerium-molybdenum-magnesium ethylbenzene dehydrogenation catalyst is prepared. The method can be used for the industrial production of styrene prepared through ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] At present, most of the production of styrene in industry is realized by the dehydrogenation of ethylbenzene. The catalyst composition used includes main catalyst, co-catalyst and porogen etc. The catalyst widely used at present is a mixed oxide catalyst mainly composed of Fe-K-Ce-Mo. The preparation method is usually to dry mix the oxides or salts of each component, knead with water, extrude, dry, and roast, such as the published US patents US4804799, US5190906 and so on. Chinese patent 95113340.3 discloses adding one or several elements of groups IB-VIIIB and IIIA-VA to the Fe-K-Mo system, and the catalyst has higher activity and selectivity. This type of catalyst is characterized by high activity and selectivity, good stability and environmental friendliness. At present, the production scale of a single set of styrene in the wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C5/333B01J23/887
Inventor 刘剑锋陈铜范勤倪军平缪长喜
Owner CHINA PETROLEUM & CHEM CORP