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Dehydrogenation tail gas absorption method for preparing styrene from ethylbenzene

A technology of tail gas absorption and tail gas absorption tower, which is applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of no dehydrogenation tail gas, no use of energy, low recovery rate of aromatics, etc., and achieve temperature reduction , The cooling water volume is reduced, which is beneficial to the absorption effect

Inactive Publication Date: 2004-12-29
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the existing literature does not involve the treatment of dehydrogenation tail gas and the low recovery rate of aromatics in the tail gas of the existing industrial installations, the large amount of cooling water and the lack of energy utilization. A new ethylbenzene Dehydrogenation Tail Gas Absorption Method for Styrene Production

Method used

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  • Dehydrogenation tail gas absorption method for preparing styrene from ethylbenzene
  • Dehydrogenation tail gas absorption method for preparing styrene from ethylbenzene
  • Dehydrogenation tail gas absorption method for preparing styrene from ethylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] press figure 1 The process dehydrogenation tail gas has a mass flow of 521.5 kg / h of hydrogen, 44.5 kg / h of methane, 290.4 kg / h of carbon dioxide, 139.2 kg / h of benzene, 58.3 kg / h of toluene, 1.8 kg / h of non-aromatic hydrocarbons, and 172.5 kg / h of ethylbenzene. Hours, 103.1 kg / h of styrene and water with a mass flow rate of 160.2 kg / h enter the tail gas compressor. The outlet temperature of the tail gas compressor is 128.6℃ and the pressure is 205KPa. Then the material enters a dehydrogenation liquid as the cold medium. The outlet temperature of the heat exchanger is 75°C and the pressure is 200KPa. Then the material enters a tail gas cooler. After cooling by the cooling water, the outlet temperature is 38°C, and enters the lower part of the tail gas absorption tower. , Use polyethylbenzene residue oil containing mixtures of triethylbenzene and tetraethylbenzene as the absorbent to enter from the upper part of the tail gas absorption tower, the absorbent feed temperature ...

Embodiment 2

[0024]According to the conditions and steps of Example 1, except that the absorbent feed temperature is changed to 15°C, the theoretical number of plates in the tail gas absorption tower is 10, and the top pressure of the tail gas absorption tower is 190KPa. As a result, the heat recovery of the heat exchanger is 790 kilowatts, the recovery rate of aromatics in the dehydrogenation tail gas is 96.7%.

Embodiment 3

[0026] According to the conditions and steps of Example 1, except that the absorbent feed temperature is changed to 10°C, the pressure at the top of the tail gas absorption tower is 160KPa, the result is that the heat recovery of the heat exchanger is 673 kW, and the recovery rate of aromatics in the dehydrogenation tail gas is 98.1 %.

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Abstract

The present invention relates to a method for absorbing tail gas produced by dehydrogenation of ethylbenzene to prepare styrene, and is aimed at mainly resolving the problems of dehydrogenation tail gas treatment, low recovery of aromatic hydrocarbon in the tail gas, high cooling water consumption and tail gas energy utilization. Said invented technical sheme adopts the following measures: raising tail gas compressor outlet pressure, adding a heat exchanger in the front of tail gas cooler, reducing absorbent feeding temp. of tail gas absorption tower and raising tower top pressure of tail gas absorption tower, so that it can better resolve the above-mentioned problems. Said invention can be used in industrial production of preparing styrene by dehydrogenation of ethylbenzene.

Description

Technical field [0001] The invention relates to a dehydrogenation tail gas absorption method for preparing styrene from ethylbenzene. Background technique [0002] Styrene is widely used as a raw material for the production of various resins, plastics and elastomers. Its wide range of applications is mainly due to the easy polymerization of styrene (such as polystyrene) or copolymerization (such as copolymerization with butadiene). Production of rubber) adaptability. [0003] The production of styrene is well known in terms of the dehydrogenation process and the various catalysts used in the process. The main research goal at present is to improve the efficiency of the process. Particularly known is the dehydrogenation process of ethylbenzene, in which the dehydrogenation is performed in a set of at least two dehydrogenation reactors connected in series and placed between the reactors, in which the reaction effluent and steam undergo heat exchange. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/327C07C15/46
Inventor 邵百祥沈伟卢文奎毛连生
Owner CHINA PETROLEUM & CHEM CORP
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