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Catalysts for dehydrogenating ethylbenzene to making styrene

A catalyst technology for the dehydrogenation of ethylbenzene, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbons, etc., can solve potassium loss, catalyst deactivation, and insufficient catalyst strength Advanced problems, to achieve the effect of good compressive strength and good technical effect

Active Publication Date: 2009-10-28
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 to overcome the problem that the catalyst strength is not high enough and the loss of potassium leads to the permanent deactivation of the catalyst, and to provide a new catalyst for the dehydrogenation of ethylbenzene to styrene

Method used

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  • Catalysts for dehydrogenating ethylbenzene to making styrene
  • Catalysts for dehydrogenating ethylbenzene to making styrene
  • Catalysts for dehydrogenating ethylbenzene to making styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 190.5 grams of iron oxide red, 90.1 grams of iron oxide yellow, 50.6 grams of potassium carbonate, 90.8 grams of persimmon nitrate, 10.3 grams of ammonium molybdate, 10.4 grams of magnesium oxide and carboxymethyl cellulose were stirred in a kneader for 1 hour, and an appropriate amount was added to remove Ionized water, stir again for half an hour, make the slurry and take it out. At room temperature, add 4000 grams of support body B impregnated by 4 mol / liter of potassium carbonate solution in the slurry and stir evenly to form a uniform coating by A. The catalyst particles are put into an oven, baked at 40-80°C for 1-6 hours, then placed in a muffle furnace, and roasted at 500-1000°C for 2-6 hours to obtain the catalyst.

Embodiment 2～6

[0026] Catalysts were prepared according to the conditions and operating steps of Example 1, except that the dosage of active components, the shape of the support, materials, etc. were changed, as shown in Table 1.

Embodiment 7

[0034] The catalysts obtained in Examples 1 to 6 and Comparative Example 1 were put into an isothermal reactor with an inner diameter of 1 "respectively, and the reaction pressure was normal pressure and the liquid space velocity was 1.0 hour. -1, reaction temperature 620 ℃, water ratio (water / ethylbenzene) (weight) under the condition of 2.0, carry out the catalytic performance evaluation of ethylbenzene dehydrogenation to styrene, the results are shown in Table 2:

[0035] Table 2 Catalyst performance of ethylbenzene dehydrogenation to styrene *

[0036]

[0037] * : Catalyst performance is the average value of 200 hours after the reaction is stable.

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Abstract

The invention relates to a catalyst used for dehydrogenating ethylbenzene to produce styrene, which mainly solves the problems of insufficient catalyst strength and insufficient service life in the prior art. The present invention adopts at least one material selected from bisque fired porcelain and α-alumina dipped in a potassium salt solution as a support body, and then evenly coats the surface of the support body with active materials including Fe2O3, K2O, Ce2O3 and MoO3 or WO3. The technical scheme of component slurry solves this problem well and can be used in the industrial production of styrene.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] At present, the vast majority of styrene in industry is realized by direct catalytic thermal dehydrogenation of ethylbenzene. The basic composition of the catalyst used includes main catalyst, co-catalyst, porogen, reinforcing agent and so on. What has been adopted by many styrene manufacturers in the world at present is a series of composite / mixed oxide catalysts based on Fe-K-Ce-Mo developed successfully in the early 1980s, such as the published US patents US4804799, US5023225 and US5190906 and so on. This type of catalyst is characterized by high activity and selectivity, good stability and environmental friendliness. However, the compressive strength of this type of catalyst is generally 15-25 N / mm, and the service life is generally 2 years, and a few of them are more than 2 years. Moreover, the catalytic performance of the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J23/888B01J23/83B01J23/78C07C5/333C07C15/46
Inventor 陈铜缪长喜范勤廖仕杰倪军平
Owner CHINA PETROLEUM & CHEM CORP