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Method for recycling hydrogen in ethylbenzene dehydrogenation waste gas

A technology for the dehydrogenation of ethylbenzene and hydrogen, which is applied in the field of petrochemical industry, can solve the problems of accelerating styrene self-polymerization, unfavorable regeneration of adsorbents, and limiting technical feasibility, so as to reduce the possibility and prolong the service life

Inactive Publication Date: 2015-06-03
NORTH HUAJIN CHEM IND GRP
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AI Technical Summary

Problems solved by technology

However, the hydrocarbons and water vapor contained in the tail gas of ethylbenzene catalytic dehydrogenation limit the technical feasibility of the hydrogen separation and purification process
The temperature rise of ethylbenzene dehydrogenation tail gas during the compression process and the catalysis of rust in pipelines and equipment can accelerate the self-polymerization of styrene, which has a serious impact on the performance and service life of hydrogen separation equipment
The water vapor contained in the tail gas of ethylbenzene catalytic dehydrogenation is not conducive to the regeneration of the adsorbent, which affects the separation performance and the life of the adsorbent. At present, there is no suitable method for long-term safe and stable treatment of ethylbenzene dehydrogenation tail gas to recover hydrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The ethylbenzene dehydrogenation tail gas produced by the styrene production unit is compressed by the compressor to form a gas-liquid mixture and put into the cryocooler, cooled to 20°C; the non-condensed ethylbenzene dehydrogenation tail gas enters from the bottom of the circulating absorption tower, Countercurrent contact with the ethylbenzene input from the top of the absorption tower, the hydrocarbons in the gas phase in the absorption tower are absorbed by ethylbenzene, the pressure at the top of the absorption tower is controlled to 170Kpa, and the liquid phase at the bottom of the absorption tower is sent to the ethylbenzene catalytic dehydrogenation reactor; from the absorption tower The gas phase discharged from the top enters the gas-liquid mixer, and after gas-liquid separation, the liquid phase returns to the ethylbenzene dehydrogenation device; the gas phase after removing hydrocarbons and water vapor enters the hydrogen separation and purification equipment...

Embodiment 2

[0022] The ethylbenzene dehydrogenation tail gas produced by the styrene production unit is compressed by the compressor to form a gas-liquid mixture and put into the deep cooler, cooled to 10°C; the non-condensed ethylbenzene dehydrogenation tail gas enters from the bottom of the circulating absorption tower, Countercurrent contact with the ethylbenzene input from the top of the absorption tower, the hydrocarbons in the gas phase in the absorption tower are absorbed by ethylbenzene, the pressure at the top of the absorption tower is controlled to 195Kpa, and the liquid phase at the bottom of the absorption tower is sent to the ethylbenzene catalytic dehydrogenation reactor; from the absorption tower The gas phase discharged from the top enters the gas-liquid mixer, and after gas-liquid separation, the liquid phase returns to the ethylbenzene dehydrogenation device; the gas phase after removing hydrocarbons and water vapor enters the hydrogen separation and purification equipmen...

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Abstract

The invention relates to a method for recycling hydrogen in ethylbenzene dehydrogenation waste gas and belongs to the field of petrochemical engineering. By the method, styrene and water vapor in the ethylbenzene dehydrogenation waste gas are effectively removed by a deep freezer, an absorbing tower and a gas-liquid separator, possibility of auto-agglutination of styrene is greatly reduced, service life of catalyst of a pressure swing adsorption device is prolonged, and accordingly, hydrogen purity is up to 98%, and recovery rate of the hydrogen is up to 80-90%.

Description

technical field [0001] The invention relates to a method for recovering hydrogen in ethylbenzene dehydrogenation tail gas, belonging to the technical field of petrochemical industry. Background technique [0002] Styrene is widely used in the production of synthetic materials such as styrene-butadiene rubber, polystyrene, ABS engineering plastics, SAN engineering plastics, and SBS rubber, as well as the synthesis of fine chemical products such as drugs and dyes. It is a very important chemical intermediate. It is mainly produced by catalytic dehydrogenation of ethylbenzene and joint oxidation of ethylbenzene / propylene. Except for a few units such as CNOOC-Shell Chemical Company, which adopt ethylbenzene / propylene combined oxidation process, most of them are produced by ethylbenzene dehydrogenation method. [0003] The dehydrogenation reaction of ethylbenzene usually adopts iron oxide-based catalyst and water vapor as the diluent, and is carried out at 580-650°C. The catalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/08
Inventor 郑树松范立成唐治钫蓝云飞袁博黄武生
Owner NORTH HUAJIN CHEM IND GRP
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