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Process for recovering ethane from natural gas

A natural gas and process technology, which is applied in the field of ethane recovery from natural gas, can solve the problems of easy freezing and blockage and the failure of normal production of the device, and achieve the effect of reducing engineering wages and reducing the energy consumption of device operation.

Active Publication Date: 2019-01-18
CHINA PETROCHEMICAL CORP +2
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AI Technical Summary

Problems solved by technology

When natural gas CO 2 When the content is higher than 1.0%, the outlet of the expander of the ethane recovery unit, the upper tray of the demethanizer, and the gas phase pipeline at the top of the demethanizer are prone to freeze blockage, and the device cannot be produced normally

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  • Process for recovering ethane from natural gas
  • Process for recovering ethane from natural gas

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Embodiment 1

[0035] Such as figure 1 Shown, the present invention provides a kind of process of recovering ethane from natural gas, comprises the following steps:

[0036] 1) Natural gas pressurization: The natural gas booster device is designed according to the incoming pressure of the feed gas and the output pressure requirements (usually when the feed gas pressure is > 2.5 times the operating pressure of the demethanizer (0.9-3.0MPa), no pressurization is required ( Adjust according to specific circumstances));

[0037] 2) Crude decarbonization of natural gas: the natural gas obtained in step 1) is decarburized by alcohol amine method to obtain CO 2 Regenerated and purified gas (CO 2 Content≤1.2% (v / v)); CO in natural gas after decarbonization 2 ≤1.2% (v / v) (adjusted according to actual working conditions), natural gas decarbonization and ethane decarbonization devices share the solution regeneration system, reducing device investment and operating energy consumption.

[0038] 3)CO ...

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PUM

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Abstract

The invention provides a process for recovering ethane from natural gas. The process comprises the following steps: 1) crude decarburization of natural gas; 2) pressurization of CO2 regeneration gas;3) dehydration of natural gas; 4) recovery of ethane; 5) fractionation of condensate; 6) fine decarburization of ethane. According to the invention, high CO2 (CO2 is more than or equal to 1.4 percent(v / v)) raw material gas is not subjected to CO2 removal, or only preliminary CO2 removal is carried out, and engineering wages and equipment operating energy consumption are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of natural gas cryogenic processing, in particular to a process for recovering ethane from natural gas. Background technique [0002] At present, the representative high-efficiency ethane recovery process is the partial dry gas circulation (RSV) process of Ortloff Company in the United States. The principle is to transfer part of the high-pressure dry gas and demethanization process After the tower top gas is heat-exchanged and condensed, it enters the top of the demethanizer through throttling and subcooling to provide reflux. The refluxed dry gas can be rectified on the gas phase at the top of the tower, increasing the ethane yield of the device to over 95%. [0003] The partial dry gas cycle process is usually suitable for CO in the raw gas 2 For treatment conditions with a content of less than 1.0%, depending on the operating pressure of the demethanizer, CO 2 The content fluctuates slightly. When na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C9/06
Inventor 吴庆有王智王翀段世文柳亭宋广明闫广宏张文钟于朋朋武侠岳韩娟娟张贤晓王静季洪强郝梦云
Owner CHINA PETROCHEMICAL CORP
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