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Low-water ratio ethylbenzene dehydrogenation catalyst

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 and low activity, and achieve improved stability sexual, highly active effect

Active Publication Date: 2007-06-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of poor stability and low activity of low-potassium catalysts existing in the prior art under low-water ratio conditions, and a new low-water-ratio ethylbenzene dehydrogenation catalyst is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 272.0 grams of iron oxide red, 142.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 78.0 grams of cerium nitrate, 9.2 grams of ammonium tungstate, 8.8 grams of magnesium oxide, 4.0 grams of copper oxide, 17.3 grams of lanthanum nitrate, 1.2 grams of samarium oxide and 17.6 Stir 1 g of carboxymethyl cellulose in a kneader for 1 hour, add deionized water, and stir for another half an hour, take out the extruded strips, extrude them into granules with a diameter of 3 mm and a length of 5 to 10 mm, put them in an oven, and bake at 80 ° C for 2 Hours, baked at 120°C for 2 hours, then placed in a muffle furnace, and calcined at 850°C for 4 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) 1.8 for activity evaluation, the test results are listed in Table 1.

Embodiment 2

[0033] The catalyst is prepared according to the method of Example 1, except that 290.0 grams of iron oxide red, 100.0 grams of iron oxide yellow, 60.0 grams of potassium carbonate, 86.0 grams of cerium oxalate, 13.2 grams of ammonium tungstate, 29.6 grams of calcium carbonate, 7.8 grams of oxide Zinc, 2.4 grams of lanthanum oxide, 30.7 grams of neodymium nitrate and 19.5 grams of carboxymethylcellulose.

[0034] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

Embodiment 3

[0036] The catalyst is prepared according to the method of Example 1, except that 210.0 grams of iron oxide red, 190.0 grams of iron oxide yellow, 52.0 grams of potassium carbonate, 56.0 grams of cerium carbonate, 3.1 grams of ammonium tungstate, 7.6 grams of boron oxide, 12.3 grams of oxide Zirconium, 4.8 grams of lanthanum oxide, 9.8 grams of praseodymium oxalate, 21.9 grams of samarium nitrate and 18.1 grams of carboxymethylcellulose.

[0037] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

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Abstract

A catalyst for dehydrogenating ethylbenzene in the condition of low water ratio is prepared through adding at least two compounds of light RE elements other than Ce, and at least one oxide of metal chosen from Ca, Mg, Ba, B, Sn, Pb, Cu, Zn, Ti, Zr, V and Mo to the Fe-K-Ce-W system. It has high stability and activity.

Description

technical field [0001] The invention relates to a low water ratio ethylbenzene dehydrogenation catalyst, in particular to a catalyst used for preparing styrene by ethylbenzene dehydrogenation in a low water ratio process. Background technique [0002] Ethylbenzene dehydrogenation is a reversible reaction with strong endothermic and molecular increase. In industry, water vapor is usually used as a diluent to reduce the partial pressure of ethylbenzene and promote the reaction to move to the product. Water vapor has the following effects in the reaction: [0003] (1) Heating the reaction raw materials to the required temperature, avoiding directly heating ethylbenzene to a higher temperature, and suppressing the generation of side reactions; [0004] (2) Supplement heat to avoid cooling due to endothermic reaction; [0005] (3) The carbon deposition on the catalyst is continuously removed through the water gas reaction, so that the catalyst is automatically regenerated. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888C07C5/333C07C15/02
Inventor 宋磊缪长喜邬时海徐永繁甘明华
Owner CHINA PETROLEUM & CHEM CORP
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