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Method for preparing styrene by dehydrogenating ethylbenzene

A technology for the production of styrene by dehydrogenation of ethylbenzene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., and can solve the problems of high energy consumption, low activity, and high reaction temperature of ethylbenzene dehydrogenation in styrene production

Active Publication Date: 2014-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the low-potassium catalyst in the prior art has low activity under low temperature conditions, which leads to high ethylbenzene dehydrogenation reaction temperature, high energy consumption for styrene production, and uneconomical production. A new catalyst is provided. Method for preparing styrene from ethylbenzene dehydrogenation

Method used

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  • Method for preparing styrene by dehydrogenating ethylbenzene
  • Method for preparing styrene by dehydrogenating ethylbenzene
  • Method for preparing styrene by dehydrogenating ethylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 320.0 grams of iron oxide red, 100.0 grams of iron oxide yellow, 50.0 grams of potassium carbonate, 85.0 grams of cerium oxalate, 5.0 grams of ammonium tungstate, 23.0 grams of magnesium oxide, 23.0 grams of samarium oxide, 10.0 grams of erbium oxide and 20.5 grams of carboxymethyl fiber Stir plain sodium in a kneader for 1 hour, add water accounting for 23% of the total weight of the catalyst, and stir for another 0.5 hour, take out the extrusion, dry, cut into particles with a diameter of 3 mm and a length of 5 to 8 mm, and put them into an oven. Baked at 110°C for 2 hours, then placed in a muffle furnace, calcined at 300°C for 2 hours, and then calcined at 900°C for 4 hours to obtain a finished catalyst. The weight percent composition of the obtained catalyst is listed in Table 1.

[0030] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , Reaction temperature of 600°C and 580°C, and water / ethylbenzene w...

Embodiment 2

[0032]The catalyst is prepared according to the method of Example 1, except that 200.0 grams of iron oxide red, 180.0 grams of iron oxide yellow, 82.9 grams of potassium carbonate, 43.2 grams of cerium carbonate, 11.2 grams of ammonium tungstate, 8.0 grams of magnesium oxide, 11.0 grams of oxide Europium, 20.6 grams of thulium oxide, 0.4 grams of titanium oxide and 32.7 grams of graphite, the weight percentage composition of the catalyst is listed in Table 1.

[0033] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

Embodiment 3

[0035] The catalyst is prepared according to the method of Example 1, except that 315.0 grams of iron oxide red, 160.0 grams of iron oxide yellow, 58.1 grams of potassium carbonate, 64.5 grams of cerium carbonate, 8.0 grams of ammonium tungstate, 3.6 grams of magnesium oxide, 4.5 grams of oxide Gadolinium, 13.5 grams of thulium oxide and 18.2 grams of polystyrene microspheres, the weight percent composition of the catalyst is listed in Table 1.

[0036] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

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Abstract

The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene, which mainly solves the problem that low activity of a low potassium catalyst under the low temperature condition in prior art causes high energy consumption and diseconomy of styrene production. According to the invention, ethylbenzene is taken as a raw material, under the condition that the ethylbenzene space velocity is 0.5-2.0 hours, the weight ratio of water to ethylbenzene is 1.0-3.0, the reaction temperature is 550 DEG C-630 DEG C, the reaction pressure is 0-20 KPa, the raw material is contacted with the catalyst for reacting to generate styrene, wherein the catalyst employs a technical scheme that at least one medium rare earth oxide which is chosen from Sm2O3, Eu2O3, Gd2O3 or Dy2O3 or at least one heavy rare earth oxide which is chosen from Er2O3, Tm2O3, Yb2O3 or Lu2O3 are added in an iron-potassium-cerium-tungsten-magnesium catalysis system. The technical scheme better solves the problem, and can be used in industrial production of preparing styrene by dehydrogenating ethylbenzene.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] As we all know, about 90% of styrene in industry is produced by catalytic dehydrogenation of ethylbenzene, and one of the keys of this method is the catalyst. There are two types of catalysts reported in patents: one is Fe-K-Cr series, such as published U.S. Patents 4,134,858, 4,152,300, and 4,144,197. Although the activity and stability of this type of catalyst are better, they are not environmentally friendly because they contain Chromium, has been phased out. The other is Fe-K-Ce-Mo series, such as published U.S. Patent 4804799, European Patent 0502510A1, 0297685A1, 0305020A1, this type of catalyst not only replaces Cr with Ce, Mo, but also has higher activity and stability than the former It has been greatly improved and has been adopted by styrene manufacturers in various countries. Its main problem is that the reaction temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C5/333B01J23/888
Inventor 宋磊缪长喜徐永繁
Owner CHINA PETROLEUM & CHEM CORP