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Method for preparing styrene by ethylbenzene dehydrogenation

A technology for producing styrene by dehydrogenation of ethylbenzene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve problems such as insufficient strength of low-potassium catalysts, uneconomical production of styrene, poor stability in use and the like , to achieve the effect of enhancing self-regeneration ability, high strength and speeding up

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

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the strength of the low-potassium catalyst in the prior art is not high enough, and the use stability is poor under the condition of low water ratio, which leads to uneconomical production of styrene. A new ethylbenzene dehydrogenation system is provided. Styrene method

Method used

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  • Method for preparing styrene by ethylbenzene dehydrogenation
  • Method for preparing styrene by ethylbenzene dehydrogenation
  • Method for preparing styrene by ethylbenzene dehydrogenation

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0034] 320.0 grams of iron oxide red, 120.0 grams of iron oxide yellow, 68.0 grams of potassium carbonate, 80.0 grams of cerium oxalate, 16.0 grams of ammonium tungstate, 8.0 grams of calcium hydroxide, 17.0 grams of rubidium oxide, 9.0 grams of promethium oxide and 20.0 grams of carboxymethyl Stir cellulose sodium in a kneader for 1.5 hours, add deionized water, stir for 0.5 hours, take out the extruded strips, extrude them into granules with a diameter of 3 mm and a length of 5-8 mm, put them in an oven, bake at 40°C for 2 hours, and then dry at 100°C Baked for 3 hours, then placed in a muffle furnace, calcined at 300°C for 2 hours, and then calcined at 850°C for 4 hours to obtain the finished catalyst.

Embodiment 2

[0036] Prepare catalyst by the method for embodiment 1, difference is with 370.0 gram iron oxide red, 85.0 gram iron oxide yellow, 34.0 gram potassium carbonate, 72.4 gram cerium oxalate, 8.7 gram tungsten oxide, 35.4 gram calcium carbonate, 30.9 gram rubidium carbonate , 13.0 grams of europium oxide and 30.6 grams of graphite.

Embodiment 3

[0038] The catalyst is prepared according to the method of Example 1, except that 300.0 grams of iron oxide red, 100.0 grams of iron oxide yellow, 56.0 grams of potassium carbonate, 82.0 grams of cerium carbonate, 25.0 grams of ammonium tungstate, 24.2 grams of calcium oxide, 31.0 grams of oxide Rubidium, 20.0 grams of gadolinium oxide and 37.5 grams of polystyrene microspheres.

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Abstract

The invention relates to a method for preparing styrene by ethylbenzene dehydrogenation, which is mainly used for solving the problem of uneconomical styrene production due to inadequate strength of low-potassium catalyst and low stability under the condition of low water ratio. The technical scheme adopted by the invention is as follows: ethylbenzene, which is used as the raw material, contacts the catalyst to react to generate styrene under the conditions that the ethylbenzene airspeed is 0.5-3.0 h<-1>, the weight ratio of water to ethylbenzene is 1.0-4.0, the reaction temperature is 570-645 DEG C, and the reaction pressure is 0-20 kPa; and the catalyst is prepared by adding a rubidium compound and at least one of medium rare earth oxides comprising Pm2O3, Eu2O3, Gd2O3 and Dy2O3 into the ferrum-potassium-cerium-tungsten-calcium catalytic system, thus the problem of uneconomical styrene production is preferably solved, and the method provided by the invention can be used for preparing styrene by ethylbenzene dehydrogenation in an industrial production mode.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] The main reaction for the dehydrogenation of ethylbenzene is C 6 h 5 -C 2 h 5 →C 6 h 5 CH=CH 2 +H 2 +124KJ / mol. From a thermodynamic point of view, reducing the partial pressure of ethylbenzene is beneficial to the balance, so water vapor is usually added in industry to promote the reaction to move toward the product. The latest development trend of ethylbenzene dehydrogenation to styrene technology is to reduce raw material consumption and improve energy efficiency. The latent heat of vaporization of water is very large, and the styrene production process consumes a large amount of superheated steam as the dehydrogenation medium, which makes the process consume a lot of energy and the production cost remains high. It is an urgent need for styrene plants, especially large-scale styrene plants, to develop low water ratio catal...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C5/333B01J23/888
Inventor 宋磊缪长喜陈铜朱敏
Owner CHINA PETROLEUM & CHEM CORP
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