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Catalyst for low-water ratio ethylbenzene dehydrogenation

An ethylbenzene dehydrogenation and catalyst technology, which is applied in the directions of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problems of poor stability of low-potassium catalysts, etc. Reducibility, improving stability, and slowing down the rate of loss

Active Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of poor stability of low-potassium catalysts in the prior art under low water ratio conditions, and a new low-water ratio ethylbenzene dehydrogenation catalyst is provided, which is used for ethylbenzene dehydrogenation The reaction of preparing styrene has the characteristics of good stability under the condition of low water ratio

Method used

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  • Catalyst for low-water ratio ethylbenzene dehydrogenation
  • Catalyst for low-water ratio ethylbenzene dehydrogenation
  • Catalyst for low-water ratio ethylbenzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 320.0 grams of iron oxide red, 120.0 grams of iron oxide yellow, 68.0 grams of potassium carbonate, 38.8 grams of cerium oxide, 16.0 grams of ammonium tungstate, 8.8 grams of magnesium hydroxide, 32.5 grams of zinc ferrite and 20.0 grams of sodium carboxymethyl cellulose Stir in the kneader for 1.5 hours, add deionized water, stir for 0.5 hours, take out the extruded strips, extrude them into particles with a diameter of 3 mm and a length of 5-8 mm, put them in an oven, bake at 60 ° C for 2 hours, and bake at 120 ° C for 3 hours. Then it was placed in a muffle furnace, calcined at 300°C for 2 hours, and then calcined at 800°C for 2.5 hours to obtain a finished catalyst.

[0030] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , 620°C, and water ratio (weight) 1.2 conditions for activity evaluation, the evaluation results are listed in Table 2.

Embodiment 2

[0032] 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, 41.5 gram magnesium carbonate, 38.0 gram ferric acid Zinc and 30.6 grams of graphite.

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

Embodiment 3

[0035] The catalyst is prepared according to the method of Example 1, except that 310.0 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 magnesium oxide, 50.1 grams of ferric acid Zinc and 37.5 g polystyrene microspheres.

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

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Abstract

The invention relates to a catalyst for low-water ratio ethylbenzene dehydrogenation, which mainly solves the problem that in the prior art, low-potassium catalyst has poor stability under the condition of low-water ratio. The invention adopts the technical scheme that ferrate is added into a ferrum-potassium-cerium-tungsten-magnesium catalytic system, so that the problem is well solved. The catalyst can be applied in industrial production of styrene prepared through ethylbenzene dehydrogenation under the condition of low-water ratio.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenating ethylbenzene with a low water ratio. 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 deve...

Claims

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Application Information

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IPC IPC(8): B01J23/888C07C15/46C07C5/333
CPCY02P20/52
Inventor 宋磊缪长喜危春玲徐永繁
Owner CHINA PETROLEUM & CHEM CORP
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