Technique of separating and recovering lighter hydrocarbons in refinery dried gas

A technology for separation and recovery of dry gas from refineries, which is applied in the recovery of liquid hydrocarbon mixtures and the petroleum industry. It can solve problems such as complex processes, high operating costs, and large equipment, and achieve good separation and recovery effects, low operating costs, and compact equipment. Effect

Inactive Publication Date: 2009-05-13
SHANGHAI DONGHUA ENVIRONMENT ENG
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  • Claims
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Problems solved by technology

[0004] Although pressure swing adsorption method, intercooler oil absorption method and cryogenic separation method have been developed at home and abroad to recover light hydrocarbons and achieved certain results, the disadvantage of pressure swing adsorption method is that the equipment is huge and the recovery rate of light hydrocarbons is not high. The product purity is low; the disadvantage of intercooler oil absorption method is low ethylene yield and high energy consumption; the disadvantage of cryogenic separation method is complicated process, high energy consumption and high operating cost

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  • Technique of separating and recovering lighter hydrocarbons in refinery dried gas
  • Technique of separating and recovering lighter hydrocarbons in refinery dried gas

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no. 4 example

[0018] In the fourth embodiment of the present invention, the inlet pressure of the dry gas in the refinery is 2.5 MPa, the inlet temperature of the first-stage organic vapor membrane separator 3 is 50°C, and the inlet temperature of the second-stage organic vapor membrane separator 4 is 35°C ; All the other are with embodiment 1. After testing, the recovery rate of ethylene was 93.0%, and the recovery rate of ethane was 93.5%.

[0019] In the fifth embodiment of the present invention, the inlet pressure of the dry gas in the refinery is 4.0 MPa, the inlet temperature of the first-stage organic vapor membrane separator 3 is 50°C, and the inlet temperature of the second-stage organic vapor membrane separator 4 is 35°C ; All the other are with embodiment 1. After testing, the recovery rate of ethylene was 95.0%, and the recovery rate of ethane was 94.5%.

no. 6 example

[0020] In the sixth embodiment of the present invention, the inlet pressure of the dry gas in the refinery is 2.0 MPa, the inlet temperature of the first-stage organic vapor membrane separator 3 is 40°C, and the inlet temperature of the second-stage organic vapor membrane separator 4 is 20°C ; All the other are with embodiment 1. After testing, the recovery rate of ethylene was 93.0%, and the recovery rate of ethane was 93.0%.

[0021] In the seventh embodiment of the present invention, the inlet pressure of the dry gas in the refinery is 2.9MPa, the inlet temperature of the first-stage organic vapor membrane separator 3 is 35°C, and the inlet temperature of the second-stage organic vapor membrane separator 4 is 20°C ; All the other are with embodiment 1. After testing, the recovery rate of ethylene was 93.0%, and the recovery rate of ethane was 93.0%.

[0022] In the eighth embodiment of the present invention, the inlet pressure of the dry gas in the refinery is 1.8MPa, the...

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Abstract

The invention discloses the technology of separating and retrieving lighter hydrocarbons from refinery gas. The method comprises the following steps: compressing the refinery gas with compressor, separating the condensate water; then separating with steam separator. Using the method, the recovery ratios of ethene and ethane are up to 94%. The method can be used to return lighter hydrocarbons from refinery gas.

Description

technical field [0001] The invention relates to a process for separating and recovering light hydrocarbons from refinery dry gas. Background technique [0002] Refinery dry gas usually contains 8-20% ethylene and about 10% ethane, as well as useful components such as propylene and propane. But at present, most of the refinery dry gas is sent to the gas pipeline network as fuel gas, and some are even put into the torch for burning, resulting in a great waste of resources. [0003] If a suitable separation method is used to recover ethane and ethylene, the former can be used as cracking raw material for ethylene plant, and the latter can be used as petrochemical raw material. Therefore, the separation and recovery of light hydrocarbons from refinery dry gas has great economic and social benefits. [0004] Although pressure swing adsorption method, intercooler oil absorption method and cryogenic separation method have been developed at home and abroad to recover light hydroca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G5/06
Inventor 赵小平吴利军王立国
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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