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Process for preparation of styrene from ethylbenzene

A technology for the production of styrene and ethylbenzene, which is applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of low catalytic activity and selectivity of hydrogen oxidation catalysts, increase the gas-solid contact area, avoid Poisoning, effects that increase use efficiency

Inactive Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that when the ethylbenzene dehydrogenation reaction catalyzed by the iron-potassium catalyst and the hydrogenation reaction of the ethylbenzene dehydrogenation material catalyzed by the noble metal catalyst are connected in series, the catalytic activity and selectivity of the hydrogen oxidation catalyst are low. , providing a new process for producing styrene from ethylbenzene

Method used

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  • Process for preparation of styrene from ethylbenzene
  • Process for preparation of styrene from ethylbenzene

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Same as Comparative Example 1, but after the dehydrogenation catalyst in the first reactor, 30 grams of potassium inhibitors were added. The reaction temperature of the potassium inhibitor is 620°C under normal pressure.

[0047] The potassium inhibitor is prepared as follows: take 50 grams of alumina and 950 grams of silicon dioxide, knead, extrude, bake at 120°C for 4 hours, bake at 450°C for 1 hour, and then bake at 1500°C for 4 hours.

[0048] The hydrogen oxidation reaction performance of embodiment 1 is shown in table 1. The styrene selectivity and styrene yield of the whole process of producing styrene from all-ethylbenzene are shown in Table 2.

Embodiment 2

[0058] Same as Example 1, but the preparation method of the potassium inhibitor is changed.

[0059] The potassium inhibitor was prepared as follows: 1103 grams of aluminum nitrate nonahydrate and 850 grams of silicon dioxide were kneaded, extruded, baked at 120°C for 4 hours, calcined at 500°C for 4 hours, and then calcined at 1500°C for 4 hours.

[0060] The hydrogen oxidation reaction performance of embodiment 2 is shown in table 1. The styrene selectivity and styrene yield of the whole process of producing styrene from ethylbenzene are shown in Table 2.

Embodiment 3

[0062] With embodiment 1, but increase potassium resistance reactor between the first dehydrogenation reactor and the hydrogenation reactor. The potassium resistance reaction is carried out in a stainless steel fixed-bed reactor with an inner diameter of 25 mm, where the reaction temperature is 500°C, the catalyst dosage is 30 grams, and the reaction pressure is 0.5 kg / cm 2 . The material reacted in the first dehydrogenation reactor directly enters the potassium barrier reactor.

[0063] Oxygen is added to the material after the reaction in the potassium resistance reactor, and then enters the hydrogen oxidation reactor. The oxygen content in the inlet feed to the hydrogen oxidation reactor was 1.1 (V)%.

[0064] Potassium inhibitor is prepared as follows: get 400 grams of alumina and 1875 grams of water glass containing 32% (weight) silicon dioxide, knead, extrude, bake at 120°C for 4 hours, bake at 450°C for 10 hours, and then bake at 1100°C for 4 hours. Hour.

[0065] T...

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Abstract

The present invention relates to a process for preparation of styrene from ethylbenzene, and mainly solves the problem that a hydrogen oxidation catalyst is low in catalytic activity and selectivity to further cause low whole process dehydrogenation reaction ethylbenzene conversion rate and styrene selectivity when ethylbenzene dehydrogenation reaction using an iron-potassium-based catalyst for catalysis and ethylbenzene dehydrogenation material hydrogen oxidation reaction using a noble metal catalyst for catalysis are in series connection. The process can well solve the problems, the process comprises a first dehydrogenation reaction step, a potassium removal step, a hydrogen oxidation reaction step and a second dehydrogenation reaction step, a dehydrogenation catalyst for the dehydrogenation reaction steps is Fe-K-based ethylbenzene dehydrogenation catalyst; a potassium retarder is used in the potassium removal step, the potassium retarder comprises, by weight, a) 5 to 90 parts of aluminum calculating on the basis of aluminum oxide and b) 10 to 95 parts of silicon calculating on the basis of silicon dioxide, and the total of the aluminum oxide and the silicon dioxide is 100 parts; and the hydrogen oxidation catalyst is a noble metal-based hydrogen oxidation catalyst; and the process can be used for the industrial production of styrene by ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to an ethylbenzene dehydrogenation-hydrogenation reaction process, in particular to an ethylbenzene dehydrogenation-hydrogenation reaction process using a potassium inhibitor. Background technique [0002] Styrene is a basic organic chemical raw material. Ethylbenzene dehydrogenation process is the most important method to produce styrene. The dehydrogenation of ethylbenzene to styrene and hydrogen is an equilibrium reaction with endothermic and molecular number increase. Increasing the reaction temperature, reducing the reaction pressure, and using a high-efficiency dehydrogenation catalyst can increase the conversion rate of ethylbenzene, but it is still limited by thermodynamic equilibrium. [0003] Ethylbenzene dehydrogenation-hydrogenation process is based on the addition of hydrogen selective oxidation reaction on the basis of ethylbenzene dehydrogenation. The basic reaction process is dehydrogenation-hydrogenation-dehydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C5/333C07C5/48
Inventor 卢立义缪长喜陈铜刘剑锋邵一凡
Owner CHINA PETROLEUM & CHEM CORP
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