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Technique for reclaiming organic hydrocarbon and nitrogen gas from polyethylene device tail gas

A technology for organic hydrocarbons and polyethylene, applied in the field of recovery of organic hydrocarbons and nitrogen, to achieve good separation and recovery effects, simple process, and convenient operation

Inactive Publication Date: 2008-09-17
SHANGHAI DONGHUA ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is no mature technology in the prior art to separate and recover organic hydrocarbons and nitrogen in the tail gas of polyethylene plants

Method used

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  • Technique for reclaiming organic hydrocarbon and nitrogen gas from polyethylene device tail gas
  • Technique for reclaiming organic hydrocarbon and nitrogen gas from polyethylene device tail gas
  • Technique for reclaiming organic hydrocarbon and nitrogen gas from polyethylene device tail gas

Examples

Experimental program
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Effect test

Embodiment 2

[0019] In the second preferred embodiment of the present invention, the operating pressure of the alkaline scrubber B is 1.0 MPa (A), and the operating temperature is 30 °C; to 25°C; the gas discharged from the separator E enters the organic vapor membrane separator F with a film feed temperature of 25°C and a film feed pressure of 0.6 MPa (A). The rest are the same as in Example 1. It was determined that the content of HCl in the tail gas after alkali washing was 33 ppm, the recovery rate of hexane was 99%, and the recovery rate of nitrogen was 98.5%.

Embodiment 3

[0021] In the third preferred embodiment of the present invention, the operating pressure of the alkaline scrubber B is 0.6 MPa (A), and the operating temperature is 100 ° C; to 25°C; the gas discharged from the separator E enters the organic vapor membrane separator F with a film feed temperature of 25°C and a film feed pressure of 1.0 MPa (A). The rest are the same as in Example 1. It was determined that the content of HCl in the tail gas after alkali washing was 41 ppm, the recovery rate of hexane was 99.3%, and the recovery rate of nitrogen was 99.2%.

Embodiment 4

[0023] In the fourth preferred embodiment of the present invention, the operating pressure of the alkaline scrubber B is 1.0 MPa (A), and the operating temperature is 10 °C; to 25°C; the gas discharged from the separator E enters the organic vapor membrane separator F with a film feed temperature of 25°C and a film feed pressure of 1.5MPa (A). The rest are the same as in Example 1. It was determined that the content of HCl in the tail gas after alkali washing was 49 ppm, the recovery rate of hexane was 99.5%, and the recovery rate of nitrogen was 99.4%.

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Abstract

The invention discloses a membrane separation process for recovering organic hydrocarbons and nitrogen from the tail gas of a polyethylene device. The recovery technology caustic-washes, compresses and cools the tail gas; the tail gas after being cooled is put in a segregator, and the organic hydrocarbons is separated and recovered; gas exhausted from the segregator is put in an organic steam membrane; the gas which enters into a membrane separator is divided into a permeating airflow rich in the organic hydrocarbons and a retentate airflow rich in N2. The technology can lead the recovery rate of the organic hydrocarbons to reach more than 99 percent, lead the recovery rate of the nitrogen to reach more than 99 percent, and lead the purity to be 99 percent. The membrane separation process is applied to the recovery and treatment of the tail gas of the polyethylene device.

Description

technical field [0001] The invention relates to a process for recovering organic hydrocarbons and nitrogen from the tail gas of a polyethylene plant. Background technique [0002] The tail gas of polyethylene plant usually contains about 50% nitrogen and about 40% n-hexane, as well as a small amount of hydrogen chloride, water, ethylene, ethane, butane and other components. But at present, most of the exhaust gas is directly burned into the torch, which is a big waste of resources. [0003] If a suitable separation method is used to recover the organic hydrocarbons and nitrogen, the former can be used as a solvent in the ethylene polymerization process, and the latter can be used as a purge gas. Therefore, the separation and recovery of organic hydrocarbons and nitrogen from the tail gas of polyethylene plants has great economic and social benefits. [0004] However, there is no mature process technology in the prior art to separate and recover the organic hydrocarbons and...

Claims

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Application Information

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IPC IPC(8): C07C7/144C07C7/09C01B21/04
Inventor 赵小平吴勇顾井丽秦伟胡家肃魏生桂周杨炎
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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