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Catalyst for preparing styrene by ethylbenzene dehydrogenation and preparation method thereof

An ethylbenzene dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of low styrene selectivity, easy carbon deposition, secondary Toluene production and other problems, to achieve the effect of good stability, increased macropore distribution, and enhanced strength

Active Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the technical problems to be solved by the present invention is the problems of many toluene by-products, low selectivity of styrene and easy carbon deposition in the existing ethylbenzene dehydrogenation technology to produce styrene. A new preparation method for ethylbenzene dehydrogenation is provided Styrene catalyst, the catalyst has the advantages of high yield and high stability of styrene when used in ethylbenzene dehydrogenation reaction; the second problem to be solved by the present invention is to provide corresponding preparation method for the above-mentioned ethylbenzene dehydrogenation to prepare styrene catalyst method

Method used

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  • Catalyst for preparing styrene by ethylbenzene dehydrogenation and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Disperse 20 grams of sodium montmorillonite into 500 ml of deionized water, stir, and let stand to swell; dissolve 4 grams of cetyltrimethylammonium bromide in 100 ml of water and gradually drop into the above montmorillonite mixture , stand and age, separate, dry, and roast to make organic montmorillonite, for subsequent use; 240 grams of iron oxide red, 120 grams of iron oxide yellow, 50 grams of potassium carbonate, 103 grams of cerium oxalate, 5 grams of ammonium molybdate, 7 grams of magnesium oxide, 10 grams of organic montmorillonite and 80 grams of deionized water are mixed, kneaded for 1 hour, extruded into particles of 3 mm and 5-8 mm in length, dried and roasted at 780 ° C for 4 hours to obtain the finished catalyst .

[0020] Catalyst at normal pressure, liquid space velocity 1.0 hours -1 , reaction temperature of 620°C, and water ratio (water / ethylbenzene) of 2.0 (weight ratio) under the reaction conditions for activity evaluation, and the evaluation resul...

Embodiment 2

[0022] The catalyst was prepared according to the method of Example 1, except that 340 grams of iron oxide red, 220 grams of iron oxide yellow, 68 grams of potassium carbonate, 85 grams of cerium oxalate, 8 grams of ammonium molybdate, 8 grams of magnesium oxide, 1 gram of oxide Calcium, 10 grams of organic montmorillonite. The activity evaluation was carried out according to the conditions of Example 1, and the evaluation results are shown in Table 1.

Embodiment 3

[0024] The catalyst was prepared according to the method of Example 1, except that the amount of organic montmorillonite added was 2 grams. 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 catalyst for preparing styrene by ethylbenzene dehydrogenation and a preparation method thereof, which is mainly used for solving the problems of multiple byproduct phenylmethane, low styrene selectivity and high tendency to carbon deposition in the prior catalysts. The technical scheme adopted by the invention is as follows: organically modified laminated clay is addedto a ferrum-potassium-cerium-molybdenum-magnesium system to obtain the catalyst. By using the technical scheme, the problems in the prior catalysts are better solved, and the catalyst can be used forpreparing styrene by ethylbenzene dehydrogenation in an industrial production mode.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenating ethylbenzene and a preparation method thereof. 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 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 sing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/34B01J31/02B01J37/00C07C15/46C07C5/333
Inventor 刘剑锋廖仕杰徐永繁范勤缪长喜
Owner CHINA PETROLEUM & CHEM CORP