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Method and apparatus for removing nitrogen from cryogenic hydrocarbon compositions

A hydrocarbon composition, nitrogen technology, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc.

Active Publication Date: 2016-04-13
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A disadvantage of the method and apparatus as described in WO2011 / 009832 is that two large gas / liquid separators are required

Method used

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  • Method and apparatus for removing nitrogen from cryogenic hydrocarbon compositions
  • Method and apparatus for removing nitrogen from cryogenic hydrocarbon compositions
  • Method and apparatus for removing nitrogen from cryogenic hydrocarbon compositions

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Embodiment Construction

[0034] This specification relates to the removal of nitrogen gas from a cryogenic hydrocarbon composition comprising a nitrogen and methane-containing liquid phase. The low temperature hydrocarbon composition is divided into a first part and a second part having the same composition and phase as the first part. The first portion is fed to a nitrogen stripper operating at stripping pressure from which nitrogen-stripped liquid is withdrawn. feeding the second portion into a nitrogen-stripped liquid or a liquid hydrocarbon product stream or process vapor from the aforementioned nitrogen-stripped liquid, and Involves the step of depressurizing at least the nitrogen-stripped liquid to a flash pressure below the stripping pressure. A stripped vapor stream is passed to a nitrogen stripper, the stripped vapor stream comprising at least a stripped portion of the process vapor after compression.

[0035] Between stream splitting and feeding the second portion into the nitrogen strippe...

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Abstract

Nitrogen is removed from cryogenic hydrocarbon compositions. The cryogenic hydrocarbon composition is divided into a first portion and a second portion having the same composition and phase as said first portion. The first portion is fed to a nitrogen stripper column operating at stripping pressure, from which nitrogen stripped liquid is extracted. feeding said second portion into a nitrogen-stripped liquid or a liquid hydrocarbon product stream or process vapor produced from said nitrogen-stripped liquid, and A step involving at least depressurizing the nitrogen stripped liquid to a flash pressure below the stripping pressure. Between stream splitting and feeding the second portion into the nitrogen-stripped liquid or liquid hydrocarbon product stream or process vapor, the second portion bypasses the nitrogen stripper column.

Description

technical field [0001] The present invention relates to a method and apparatus for separating nitrogen gas from low temperature hydrocarbon compositions. Background technique [0002] Liquefied natural gas (LNG) forms an economically important example of such cryogenic hydrocarbon compositions. Natural gas is a useful fuel source, as well as a source of various hydrocarbon compounds. It is often desirable to liquefy natural gas in a LNG plant at or near the source of the natural gas stream for a number of reasons. For example, natural gas is easier to store as a liquid and transport it over long distances than a gas form because it occupies a smaller volume and does not need to be stored under high pressure. [0003] WO2011 / 009832 describes a method for treating a multiphase hydrocarbon stream produced from natural gas, wherein lower boiling components, such as nitrogen, are separated from the multiphase hydrocarbon stream to produce a stream with lower A liquefied natura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02F25J1/02F25J1/00
CPCF25J1/0022F25J1/004F25J1/0042F25J1/0052F25J1/0055F25J1/0214F25J1/0216F25J1/0237F25J1/0284F25J3/0209F25J3/0233F25J3/0257F25J2200/02F25J2200/40F25J2200/50F25J2200/74F25J2205/02F25J2210/06F25J2230/60F25J2240/30F25J2245/02F25J2245/90F25J2280/02F25J1/0255F25J1/0292F25J3/02
Inventor A·M·C·R·桑托斯
Owner SHELL INT RES MAATSCHAPPIJ BV