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Device and method for preparing ethylbenzene from ethylene recovered from refinery dry gas by pressure swing adsorption

A technology for refinery dry gas and ethylbenzene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc. Complex separation process and other problems, to achieve the effect of reducing follow-up operating costs, saving equipment investment, and reducing benzene absorption towers

Active Publication Date: 2015-08-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems in the whole process mainly include the complicated product separation process, the large processing capacity of the alkylation reactor and the crude separation tower, which lead to the problem of large equipment size
There have been reports about the device for catalytic reaction rectification of dry gas, but there is also the problem of large reactor equipment size

Method used

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  • Device and method for preparing ethylbenzene from ethylene recovered from refinery dry gas by pressure swing adsorption
  • Device and method for preparing ethylbenzene from ethylene recovered from refinery dry gas by pressure swing adsorption
  • Device and method for preparing ethylbenzene from ethylene recovered from refinery dry gas by pressure swing adsorption

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method of the present invention is used for refinery dry gas system ethylbenzene and the process of purification, as figure 2As shown, including adsorption tower, catalytic reaction rectification tower, benzene reflux tank, toluene tower, ethylbenzene tower, propylbenzene tower, polyethylbenzene tower, transalkylation reactor, condenser, reboiler, compressor, Pumps and related feed pipelines and pipelines connecting the above equipment; condensers are installed at the top of the catalytic reaction rectification tower, toluene tower, ethylbenzene tower, propylbenzene tower, and polyethylbenzene tower, and reboilers are installed at the bottom of the tower; raw materials The refinery dry gas is connected to the adsorption tower, the material obtained after adsorption and desorption is connected to the inlet of the compressor, the outlet material of the compressor is connected to the lower feed port of the catalytic reaction rectification tower, and the raw material be...

Embodiment 2

[0032] The method of the present invention is used in the process of refinery dry gas system ethylbenzene, and device is identical with the flow process described in implementation example 1. The temperature during adsorption is 20°C, the adsorption pressure is 0.1MPa, and the volume space velocity is 400 -1 , Desorption adopts the method of vacuuming to 250mmHg; the operating pressure of the catalytic reaction rectification tower is 0.5MPa, the reaction temperature is 250°C, the reflux ratio is 2, and the molar ratio of the total amount of benzene to olefins is 6. The gas composition before and after adsorption and desorption is shown in Table 2.

[0033] Table 2 Gas composition of refinery dry gas before and after adsorption and desorption

[0034]

[0035] After the catalytic dry gas passes through the pressure swing adsorption device, the medium-concentration dry gas is obtained, the concentration of ethylene reaches 53%, and the recovery rate of ethylene reaches 94%. ...

Embodiment 3

[0037] The method of the present invention is used in the process of refinery dry gas system ethylbenzene, and device is identical with the flow process described in implementation example 1. The temperature during adsorption is 50°C, the adsorption pressure is 1MPa, and the volume space velocity is 1500 -1 , Desorption adopts the method of vacuuming to 250mmHg; the operating pressure of the catalytic reaction rectification tower is 1MPa, the reaction temperature is 350°C, the reflux ratio is 10, and the molar ratio of the total amount of benzene to olefins is 7. The gas composition before and after adsorption and desorption is shown in Table 3.

[0038] Table 3 Gas composition of refinery dry gas before and after adsorption and desorption

[0039]

[0040] After the catalytic dry gas passes through the pressure swing adsorption device, the medium-concentration dry gas is obtained, the concentration of ethylene reaches 58.7%, and the recovery rate of ethylene reaches 93.1%...

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Abstract

The invention relates to a device and a method for preparing ethylbenzene from ethylene recovered from refinery dry gas by pressure swing adsorption. The refinery dry gas and non-condensable gas at the top of a catalytic reaction rectification tower enter an adsorption tower loaded with an adsorbent, adsorbed residual gas is directly discharged from the device, pressure relief gas is directly discharged from the system when adsorption saturation is reached, and medium-concentration dry gas is obtained through desorption operation and enters the lower part of the catalytic reaction rectification tower after being pressurized through a compressor. Raw material benzene enters the upper part of the catalytic reaction rectification tower, the non-condensable gas at the top of the catalytic reaction rectification tower after a gas phase is condensed through a condenser part returns to the adsorption tower, a condensed liquid phase enters a benzene return tank, one part of the liquid phase is returned, the other part of the liquid phase serves as benzene feed liquid of a transalkylation reactor, and liquid obtained through an extraction pump of a tower kettle at the bottom of the catalytic reaction rectification tower enters a toluene tower for subsequent separation. The size of the alkylation reactor can be greatly reduced; benzene and a generated product are separated while a reaction is produced, so that conventional benzene tower and crude separation tower devices are reduced and the equipment investment is reduced.

Description

technical field [0001] The present invention relates to a method for separating refinery dry gas and preparing ethylbenzene, in particular to a method for separating and recovering ethylene in refinery dry gas by using a pressure swing adsorption device and preparing ethylbenzene by adopting catalytic reaction rectification technology and device Methods. Background technique [0002] Ethylbenzene is an important industrial raw material, 90% of which is produced by the reaction of benzene and high-concentration ethylene. The source of ethylene directly affects the operating cost and economic benefits of the ethylbenzene industry. Refinery dry gas is an important resource in petrochemical industry, and the content of ethylene in it is about 10-20 mol%. The recovery and reuse of ethylene in dry gas has gradually attracted people's attention. [0003] At present, the methods for recovering ethylene from refinery dry gas mainly include cryogenic separation, intercooled oil abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C2/66
Inventor 李鑫钢高鑫李洪丛山贾雪婷韩祯姜斌许长春张国瑞
Owner TIANJIN UNIV
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