Ethylene separation method

A separation method, ethylene technology, applied in chemical instruments and methods, distillation purification/separation, hydrocarbon purification/separation, etc., can solve problems such as excessive ethylene loss

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem of more ethylene loss in the ethylene refining process in the prior art, so as to provide a new ethylene separation method

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The composition of crude ethylene from the reaction system is: hydrogen 0.05kg / h, methane 2.17kg / h, carbon monoxide 3.70kg / h, ethanol 0.33kg / h, ethylene 904.92kg / h, ethane 5.07kg / h, acetaldehyde 0.34kg / h, propylene 1.12kg / h, C 3 + 4.43kg / h, ether 4.09kg / h, water 530.27kg / h. The crude ethylene stream enters the middle and lower part of the ethylene rectification tower after being compressed, cooled and dried. The ethylene rectification tower is a packed tower or a plate tower with a total of 84 theoretical trays, of which the rectification section has 48 trays. The temperature at the top of the tower is -17°C, the pressure at the bottom of the tower is 2.69MPaG, the temperature at the bottom of the tower is -2°C, the reflux ratio is 2.7, and the temperature of the reflux liquid is -20°C.

[0016] As a result, ethane, C 3 And the ethylene rectification tower still liquid of the above components, its composition is: ethanol 0.27kg / h, ethylene 27.15kg / h, ethane 17.55kg / ...

Embodiment 2

[0019] According to the conditions and steps of Example 1, the operating pressure and temperature of the ethylene rectification tower remained unchanged; the operating temperature of the flash tank was changed to 20°C, and the amount of still liquid circulating to the middle of the flash tank and the still liquid discharged to the outside were changed. The amount ratio is 120:1 (weight ratio), then the composition of the kettle liquid discharge is: ethanol 0.22kg / h, ethylene 3.27kg / h, ethane 4.01kg / h, acetaldehyde 0.27kg / h, propylene 0.89kg / h, C 3 + 3.51kg / h, ether 3.24kg / h, then the ethylene recovery rate of the ethylene rectification tower is 99.63%, and the purity of the ethylene product is 99.92%.

Embodiment 3

[0021] According to the conditions and steps of Example 1, change the top pressure of the ethylene rectification tower to 2.25MPaG, then the temperature at the top of the tower is -26°C, the pressure at the bottom of the tower is 2.29MPaG, the temperature at the bottom of the tower is -6°C, and the reflux ratio remains unchanged , the temperature of the reflux liquid is -30°C; the operating temperature of the flash tank remains unchanged, the operating pressure is changed to 2.25MPaG, and the ratio of the volume of the still liquid circulating to the middle of the flash tank to the volume of the still liquid discharged to the outside remains unchanged, then the still The composition of liquid discharge is: ethanol 0.22kg / h, ethylene 1.64kg / h, ethane 5.07kg / h, acetaldehyde 0.34kg / h, propylene 1.12kg / h, C 3 + 4.43kg / h, ether 4.09kg / h, then the ethylene recovery rate of the ethylene rectification tower is 99.82%, and the purity of the ethylene product is 99.95%.

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Abstract

The invention relates to an ethylene separation method, which mainly solves the problems of large loss amount of ethylene in an ethylene rectifying tower and low recovery rate of ethylene in prior art. The separation method of the invention is characterized in that the crude ethylene is compressed and dried to enter in the ethylene rectifying tower, a material flow at the top of the ethylene rectifying tower enters into a light component eliminating tower for separating, a light component is eliminated at the top of the light component eliminating tower to obtain a ethylene product; a material in a tower kettle of the ethylene rectifying tower is flash evaporated through a flash evaporation pot, the material at the top enters in the bottom part of the ethylene rectifying tower, a part of the material at the bottom circularly enters in a central part of the flash evaporation pot, the other part of the material is discharged outside. The technical scheme better solves the problems and can be used in industrial production of ethylene.

Description

technical field [0001] The invention relates to an ethylene separation method. Background technique [0002] Ethylene is a very important petrochemical raw material, and its bulk downstream products mainly include polyethylene, ethylene oxide, ethylene glycol, polyvinyl chloride, styrene, vinyl acetate, etc. [0003] The production process of ethanol dehydration to ethylene and the catalysts used are well known. The current main research direction is to improve the process flow, reduce the unit consumption of ethanol, and increase the economic benefits of the device. [0004] Among the process methods of ethanol dehydration to ethylene, there are many methods in the published literature or patents at home and abroad, and the basic processes are mainly divided into fixed bed process and fluidized bed process. ABB Lummus company once proposed to carry out ethanol dehydration reaction to produce ethylene (USP4134926) with fluidized bed technology at the end of the seventies, ...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C7/04C07C7/00
Inventor 沈伟刘军朱瑛
Owner CHINA PETROLEUM & CHEM CORP
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