Ethylbenzene dehydrogenation catalyst in low water ratio

A technology of ethylbenzene dehydrogenation and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problems of poor stability of low-potassium catalysts and achieve improved resistance Effects of reducibility, improved stability, good technical effect

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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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 low-water ratio conditions in the prior art, and a new low-water-ratio ethylbenzene dehydrogenation catalyst is provided, which is used for ethylbenzene dehydrogenation to prepare benzene Ethylene reaction has the characteristics of good stability under the condition of low water ratio

Method used

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  • Ethylbenzene dehydrogenation catalyst in low water ratio
  • Ethylbenzene dehydrogenation catalyst in low water ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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 manganese 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 850°C for 2.5 hours to obtain a finished catalyst.

[0031] 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.

[0032]

Embodiment 2

[0034] 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 Manganese and 30.6 grams of graphite.

[0035] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the evaluation results are listed in Table 2.

Embodiment 3

[0037] 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 Manganese and 37.5 g polystyrene microspheres.

[0038] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the evaluation results are listed in Table 2.

[0039]

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Abstract

The invention relates to an ethylbenzene dehydrogenation catalyst in low water ratio, which mainly solves the problem that a low-potassium catalyst is poor in stability under a low water ratio condition in the prior art. Due to the adoption of the technical scheme of adding ferrate into a ferric-potassium-cerium-tungsten-magnesium catalytic system, the problem is well solved. The ethylbenzene dehydrogenation catalyst in low water ratio can be used for industrialized production of preparing styrene by ethylbenzene dehydrogenation under the low water ratio condition.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C15/46C07C5/333
Inventor 宋磊危春玲朱敏徐永繁缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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