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Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio and preparation method thereof

An ethylbenzene dehydrogenation and catalyst technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems such as poor stability of low-potassium catalysts, and achieve enhanced The effect of self-regeneration ability, improved stability, good technical effect

Active Publication Date: 2012-03-14
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 shortcoming of the low-potassium catalyst in the prior art that has poor stability under low water ratio conditions, and a new catalyst for the preparation of styrene by dehydrogenation of ethylbenzene is provided, which is used for The dehydrogenation reaction of ethylbenzene has the characteristics of good stability under the condition of low water ratio

Method used

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  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio and preparation method thereof
  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio and preparation method thereof
  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio and preparation method thereof

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Experimental program
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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, 38.8 grams of cerium oxide, 16.0 grams of ammonium tungstate, 8.8 grams of magnesium hydroxide, 23.5 grams of cesium nitrate, 9.0 grams of samarium 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 then calcined at 850°C for 4 hours to obtain the finished catalyst.

[0036] 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 ...

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, 41.5 gram magnesium carbonate, 28.9 gram cesium carbonate , 6.5 grams of europium oxide, 6.5 grams of samarium 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 310.0 gram iron oxide red, 100.0 gram iron oxide yellow, 56.0 gram potassium carbonate, 82.0 gram cerium carbonate, 25.0 gram ammonium tungstate, 24.2 gram magnesium oxide, 35.8 gram carbonic acid Cesium, 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 an ethylbenzene dehydrogenation catalyst at a low steam-to-oil ratio and mainly aims to overcome the problem that low-potassium catalysts in the prior art have poor stability under the condition of a low steam-to-oil ratio. According to the invention, a caesium compound and at least one selected from the group consisting of rare earth oxides, i.e., Sm2O3, Eu2O3, Gd2O3 andDy2O3, are added into the catalytic system of iron-potassium-cerium-tungsten-magnesium; therefore, the above mentioned problem is well overcome, and the prepared catalyst can be used in industrial production of styrene through dehydrogenation of ethylbenzene.

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): B01J23/888C07C15/46C07C5/333
Inventor 宋磊缪长喜朱敏
Owner CHINA PETROLEUM & CHEM CORP
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