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Low-water-ratio ethylbenzene dehydrogenation catalyst and preparation method thereof

An ethylbenzene dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as poor stability of low-potassium catalysts

Active Publication Date: 2011-03-30
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 of low-potassium catalysts in the prior art under low water ratio conditions, and a new catalyst for the preparation of styrene by ethylbenzene dehydrogenation is provided

Method used

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  • Low-water-ratio ethylbenzene dehydrogenation catalyst and preparation method thereof
  • Low-water-ratio ethylbenzene dehydrogenation catalyst and preparation method thereof
  • Low-water-ratio ethylbenzene dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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.

[0036] 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) 1.5 to conduct activity evaluation, and measure the crushing strength of the catalyst. The test results are listed in Ta...

Embodiment 2

[0038] 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.

[0039]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

[0041] 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.

[0042] 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 low-water-ratio ethylbenzene dehydrogenation catalyst and a preparation method thereof. The invention mainly solves the problem of poor stability of a low-potassium catalyst under the condition of low water ratio in the prior art. The technical scheme of the invention is as follows: rubidium compounds and at least one of rare earth oxides Pm2O3, Eu2O3, Gd2O3 and Dy2O3 are added into the ferrum-potassium-cerium-tungsten-calcium catalytic system. By using the technical scheme, the invention better solves the problem, and can be used in industrial production of styrene by ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenating ethylbenzene with a low water ratio and a preparation method 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, especially la...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J23/83B01J23/78B01J37/08C07C15/46C07C5/333
Inventor 宋磊缪长喜危春玲陈铜
Owner CHINA PETROLEUM & CHEM CORP
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