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Method for preparing styrene through ethylbenzene dehydrogenation

A technology for dehydrogenation of ethylbenzene and styrene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve problems such as poor stability and low activity, and achieve improved stability, high activity, and improved stability. Effect

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

[0004] The technical problem to be solved by the present invention is the problems of poor stability and low activity in the use of low-potassium catalysts for ethylbenzene dehydrogenation under low water ratio conditions in the prior art, and a new method for ethylbenzene dehydrogenation under low water ratio conditions is provided. How to make styrene from hydrogen

Method used

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  • Method for preparing styrene through ethylbenzene dehydrogenation
  • Method for preparing styrene through ethylbenzene dehydrogenation
  • Method for preparing styrene through ethylbenzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 272.0 grams of iron oxide red, 142.0 grams of iron oxide yellow, 70 grams of potassium carbonate, 78 grams of cerium nitrate, 9.2 grams of ammonium molybdate, 0.9 grams of tin oxide (SnO 2 ), 1 gram of antimony trioxide (Sb 2 o 3 ), 17.6 carboxymethyl cellulose was stirred in a kneader for 1 hour, added deionized water, and stirred for another half an hour, took out the extruded strips, extruded into particles with a diameter of 3 mm and a length of 8 to 10 mm, and put them into an oven for 80 ℃ for 2 hours, 120 ℃ for 2 hours, then placed in a muffle furnace, and baked at 900 ℃ for 4 hours to prepare the catalyst.

[0025] Put 100ml catalyst into the reactor, normal pressure, liquid space velocity 1.0 hour -1 , 620°C, and water ratio (weight) 1.5 conditions for activity evaluation, the test results are listed in Table 1 and Table 3.

Embodiment 2

[0027] The catalyst is prepared according to the method of Example 1, except that 290 grams of iron oxide red, 100 grams of iron oxide yellow, 60 grams of potassium carbonate, 54 grams of cerium nitrate, 4 grams of magnesium oxide (MgO), 4.2 grams of calcium oxide (CaO ), 12 grams of ammonium molybdate, 3 grams of antimony trioxide (Sb 2 o 3 ), 2 grams of bismuth trioxide (Bi 2 o 3 ) 15 grams of carboxymethyl cellulose.

[0028] Activity evaluation was carried out according to the evaluation method of Example 1, and the test results are listed in Table 1 and Table 3.

Embodiment 3

[0030] The catalyst is prepared according to the method of Example 1, except that 210 gram iron oxide red, 190 gram iron oxide yellow, 52 gram salt of wormwood, 56 gram cerium oxalate, 3 gram ammonium molybdate, 4 gram bismuth trioxide (Bi 2 o 3 ), 3 grams of alumina (Al 2 o 3 ), 18 grams of carboxymethyl cellulose.

[0031] Activity evaluation was carried out according to the evaluation method of Example 1, and the test results are listed in Table 1 and Table 3.

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Abstract

The invention relates to a method for preparing styrene through ethylbenzene dehydrogenation under the condition of a low water ratio, which mainly solves the problem that a low-potassium catalyst has poor stability under the condition of low water ratio in the prior art. In the invention, ethylbenzene is used as a raw material, the raw material and a catalyst are in contact to react to produce styrene under the conditions that the reaction air speed is 0.2-3.0 / h and the weight ratio of steam / ethylbenzene is 0.5-2.5, wherein the adopted catalyst is formed by adding at least two elements of IIA-IVA families into the iron- potassium-cerium-molybdenum system, and the roasting temperature of the catalyst is 800-950 DEG C. for the technical scheme for preparing styrene through ethylbenzene dehydrogenation better solves the problem, and can be used for the industrial production of ethylbenzene dehydrogenation under the condition of low water ratio.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene under the condition of low water ratio. Background technique [0002] Ethylbenzene dehydrogenation is a reversible reaction with strong endothermic and molecular increase. In industry, water vapor is usually used as a diluent to reduce the partial pressure of ethylbenzene and promote the reaction to move to the product. Water vapor has the following effects in the reaction: (1) heating the reaction raw materials to the required temperature, avoiding directly heating ethylbenzene to a higher temperature, and suppressing the occurrence of side reactions; (2) supplementing heat to avoid cooling due to the heat absorption of the reaction ; (3) The carbon deposit on the catalyst is continuously removed through the water gas reaction, so that the catalyst is automatically regenerated. (4) Maintain Fe in the active phase of the catalyst 3+ The stability of the catalyst ...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C5/333B01J23/887
Inventor 廖仕杰缪长喜范勤刘剑锋徐永繁
Owner CHINA PETROLEUM & CHEM CORP
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