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Method for preparing styrene through oxidative dehydrogenation of ethylbenzene

A technology for oxidative dehydrogenation and styrene, applied in chemical instruments and methods, catalysts, organic chemistry, etc., can solve problems such as poor selectivity, achieve mild oxidation ability, stable performance, and high catalytic activity

Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technology to be solved by the present invention is the problem of poor selectivity in the production of styrene by oxidative dehydrogenation of ethylbenzene in an oxygen atmosphere in the prior art, and provides a method for the production of styrene by oxidative dehydrogenation of ethylbenzene, which has high selectivity features

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take by weighing 50mg nano-diamonds (average particle diameter 20nm) and pack in Φ10 fixed-bed quartz tube, pass into the mixed raw material gas of 2.8% ethylbenzene, 2.8% nitrous oxide and helium balance with 10ml / min flow rate, at 550 ℃ After 20 hours of reaction, the gas after the reaction was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. The conversion rate of ethylbenzene is 35%, the selectivity of styrene is 96%, and the total selectivity of other by-products is 4%.

Embodiment 2

[0028] Weigh 50mg of nano-diamonds (average particle size 20nm) baked at 900°C for 3 hours under a helium atmosphere and put them into a Φ10 fixed bed quartz tube, and feed 2.8% ethylbenzene, 2.8% nitrous oxide and helium at a flow rate of 10ml / min. The mixed raw material gas in gas balance was reacted at 550°C for 20 hours, and the gas after the reaction was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. The conversion rate of ethylbenzene is 51%, the selectivity of styrene is 95%, and the total selectivity of other by-products is 5%.

[0029] Through the comparison of Example 1 and Example 2, it can be seen that the selectivity of the nano-diamond is basically unchanged after being calcined, but the conversion rate is obviously improved.

Embodiment 3

[0031] Weigh 50mg of nitrogen-doped nano-diamond (2wt% nitrogen doping, average particle size 20nm) and pack it into a Φ10 fixed-bed quartz tube, and feed 2.8% ethylbenzene, 14% nitrous oxide and helium at a flow rate of 10ml / min The balanced mixed raw material gas was reacted at 550°C for 20 hours, and the gas after the reaction was continuously detected by gas chromatography, and no catalyst deactivation was found during the reaction. The conversion rate of ethylbenzene is 48%, the selectivity of styrene is 96%, and the total selectivity of other by-products is 4%.

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Abstract

The invention relates to a method for preparing styrene through oxidative dehydrogenation of ethylbenzene and aims at solving the problem that the selectivity is poor when styrene is prepared through oxidative dehydrogenation of the ethylbenzene at an oxygen gas atmosphere in the prior art. According to the technical scheme, the method for preparing the styrene through oxidative dehydrogenation of the ethylbenzene comprises the following step: by taking a carbon nonmaterial as a catalyst, nitrous oxide as an oxidant and gas which is inert to reaction as a diluent, preparing the styrene through oxidative dehydrogenation of the ethylbenzene, so that the method relatively well solves the technical problems and can be used for industrial production of the styrene.

Description

technical field [0001] The invention relates to a method for preparing styrene by oxidative dehydrogenation of ethylbenzene. Background technique [0002] Styrene is the main monomer material of synthetic rubber and resin. In the past 20 years, with the continuous development of the global styrene downstream product market, the demand for styrene has increased year by year. It is estimated that by 2020, the domestic styrene production capacity will exceed 8 million tons per year, and according to the currently known plans for the new, expanded and proposed construction of downstream devices, the apparent demand for styrene in downstream devices will reach 9 million tons per year, The gap still exceeds 1 million tons per year, which will certainly bring great potential and prospects to the development of ethylbenzene dehydrogenation catalysts. Therefore, it is both meaningful and challenging to develop high-performance catalysts for ethylbenzene dehydrogenation to styrene se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/42C07C15/46
CPCC07C5/42C07C2521/18C07C2527/24C07C15/46
Inventor 苏党生刁江勇刘洪阳陈铜缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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