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Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio

A technology of ethylbenzene dehydrogenation and catalyst, applied in the field of low water ratio ethylbenzene dehydrogenation catalyst, can solve the problems of low activity and poor selectivity, achieve high activity, increase production efficiency, and improve selectivity

Pending Publication Date: 2015-10-07
廖仕杰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Based on the problems of poor selectivity and low activity of ethylbenzene dehydrogenation catalysts in the prior art under low water ratio conditions, the purpose of the present invention is to provide a low water ratio ethylbenzene dehydrogenation catalyst, which is used for ethylbenzene dehydrogenation reaction In the preparation of styrene, it has the characteristics of good selectivity and high activity under low water ratio conditions, improving production efficiency

Method used

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  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio
  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio
  • Ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Stir 150.0 g of red iron oxide, 80.0 g of yellow iron oxide, 53 g of potassium carbonate, 66 g of cerium carbonate, 3 g of ammonium molybdate, 2 g of sodium carbonate, 10.6 g of carboxymethyl cellulose in a kneader for 1 hour, add Deionized water, stir for another 0.5 hours, take out the extruded bar, extrude it into granules with a diameter of 3 mm and a length of 8-10 mm, put it in an oven, dry it at 80 °C for 2 hours, and dry it at 120 °C for 2 hours, and then put it in a muffle furnace. The catalyst was prepared by calcining at 900°C for 4 hours.

[0028] The activity of the prepared catalyst is evaluated in an isothermal fixed bed. The specific process is as follows: the deionized water and ethylbenzene are respectively input into the preheating mixer through the metering pump, and the preheated and mixed gaseous state enters the reactor. The reactor is 1 inch The stainless steel tube can be filled with 100ml of catalyst with a particle size of 3mm. The reactor is ...

Embodiment 2

[0032] Others are the same as Example 1, except that the raw materials for preparing catalyst in Example 2 are 285 grams of red iron oxide, 110 grams of iron oxide yellow, 65 grams of potassium carbonate, 78 grams of cerium nitrate, 12 grams of ammonium molybdate, 30 grams of g sodium bicarbonate, 15 g carboxymethyl cellulose. After the catalyst was prepared, the activity of the catalyst was evaluated according to the evaluation method in Example 1. The test results are shown in Table 1.

Embodiment 3

[0034] Others are the same as Example 1, except that the raw materials for preparing catalyst in Example 3 are 150 grams of red iron oxide, 100 grams of yellow iron oxide, 108 grams of potassium carbonate, 56 grams of cerium oxalate, 5 grams of ammonium molybdate, 15 grams of g of sodium nitrate, 10 g of carboxymethyl cellulose. After the catalyst was prepared, the activity of the catalyst was evaluated according to the evaluation method in Example 1. The test results are shown in Table 1.

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Abstract

The invention discloses an ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio. The catalyst comprises, by weight, 60-85% of Fe2O3, 3-25% of K2O, 0.2-5% of MoO3, 3-20% of CeO2, and the balance of a Na compound or oxide. The ethylbenzene dehydrogenation catalyst with low steam-to-oil ratio has the advantages of high selectivity and activity under low steam-to-oil ratio conditions, and good stability.

Description

technical field [0001] The invention relates to the technical field of alkyl aromatic hydrocarbon dehydrogenation catalysts, in particular to a low water ratio ethylbenzene dehydrogenation catalyst. Background technique [0002] Dehydrogenation of ethylbenzene 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 towards the product. Water vapor has the following functions in the reaction: [0003] (1) heating the reaction raw materials to the required temperature, avoiding directly heating ethylbenzene to a higher temperature, suppressing the occurrence of side reactions, and improving selectivity; [0004] (2) Supplement heat to avoid cooling due to the endothermic reaction; [0005] (3) Continuously remove the carbon deposits on the catalyst through the water-gas reaction, so that the catalyst can be automatically regen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887
Inventor 廖仕杰
Owner 廖仕杰