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Ethylbenzene dehydrogenation catalyst with high activity and low water ratio, preparation method and application thereof

A technology for ethylbenzene dehydrogenation and catalysts, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. It can solve the problems of low activity and poor stability of low-potassium catalysts, etc. , to achieve high activity, enhance electron transfer ability, improve stability and activity

Active Publication Date: 2015-12-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Ethylbenzene dehydrogenation catalyst with high activity and low water ratio, preparation method and application thereof
  • Ethylbenzene dehydrogenation catalyst with high activity and low water ratio, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 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, 17.0 grams of cobalt oxide, 9.0 grams of erbium 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 to 8 mm, put them in an oven, bake at 60°C for 2 hours, and dry at 130°C Baked for 3 hours, then placed in a muffle furnace, calcined at 300°C for 2 hours, and calcined at 950°C for 4 hours to obtain the finished catalyst.

[0037] 100 milliliters of catalysts are loaded into the reactor, and the reaction time is 1.3 hours at normal pressure and liquid space velocity －1 , 620°C, and water ratio (weight) 1.5 to conduct activity evaluation, and measure the crushing strength of the catalyst. The test results a...

Embodiment 2

[0039] 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, 25.0 gram cobalt oxide , 6.5 grams of thulium oxide, 6.5 grams of erbium oxide and 30.6 grams of graphite.

[0040] Carry out activity evaluation and intensity determination by the evaluation condition of embodiment 1 and intensity determination method, test result is listed in table 2.

Embodiment 3

[0042] 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, 31.0 grams of oxide Cobalt, 20.0 grams of lutetium oxide and 37.5 grams of polystyrene microspheres.

[0043] Carry out activity evaluation and intensity determination by the evaluation condition of embodiment 1 and intensity determination method, test result is listed in table 2.

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Abstract

The invention relates to a high activity and low water ratio ethylbenzene dehydrogenation catalyst, a preparation method and an application of the catalyst, which mainly solve the problems of poor stability and low activity of a low potassium catalyst under the condition of a low water ratio in the prior art. The catalyst employs the technical scheme of adding cobaltous oxide and at least one of heavy rare earth oxides Er2O3, Tm2O3, Yb2O3 or Lu2O3 into a ferrum-potassium-cerium-tungsten-magnesium catalysis system, so that the problems are better solved, and the catalyst can be used for industrial production of preparing styrene through ethylbenzene dehydrogenation under the condition of the low water ratio.

Description

technical field [0001] The invention relates to an ethylbenzene dehydrogenation catalyst with high activity and low water ratio, a preparation method and application thereof. 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, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888C07C5/333C07C15/46
CPCY02P20/52
Inventor 宋磊危春玲朱敏徐永繁缪长喜
Owner CHINA PETROLEUM & CHEM CORP