Mixed Refrigerant Liquefaction Process

Inactive Publication Date: 2007-10-04
STONE JOHN B +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] Methods for liquefying a natural gas stream are provided. In one embodiment, the method includes placing a mixed component refrigerant in a heat exchange area with a process stream; separating the mixed component refrigerant a

Problems solved by technology

Such refrigeration cycles are costly in terms of both capital expenditure and operation due t

Method used

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  • Mixed Refrigerant Liquefaction Process
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  • Mixed Refrigerant Liquefaction Process

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specific embodiments

[0021] Various specific embodiments are described below, at least some of which are also recited in the claims. For example, at least one embodiment is directed to a method for liquefying a natural gas stream by placing a mixed component refrigerant in a heat exchange area with a process stream and separating the mixed component refrigerant at one or more pressure levels to produce a refrigerant vapor and a refrigerant liquid. The refrigerant vapor bypasses around the heat exchange area to a compression unit, and the refrigerant liquid passes to the heat exchange area.

[0022] At least one other specific embodiment is directed to liquefying a natural gas stream by placing a mixed component refrigerant in a heat exchange area with a process stream and withdrawing two or more side streams of the mixed component refrigerant from the heat exchange area. The side streams of mixed component refrigerant are then separated at one or more pressure levels to produce refrigerant vapors and refr...

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Abstract

A method for liquefying a natural gas stream is provided. In one embodiment, the method includes placing a mixed component refrigerant in a heat exchange area with a process stream; separating the mixed component refrigerant at one or more pressure levels to produce a refrigerant vapor and a refrigerant liquid; bypassing the refrigerant vapor around the heat exchange area to a compression unit; and passing the refrigerant liquid to the heat exchange area. In another embodiment, the method further includes partially evaporating the refrigerant liquid stream within the heat exchange area to retain a liquid fraction of at least 1% by weight.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application 60 / 565,589, filed Jun. 23, 2004.BACKGROUND [0002] 1. Technical Field [0003] Embodiments of the present inventions generally relate to methods for refrigerating gas streams, such as natural gas, using mixed component refrigerants. [0004] 2. Description of Related Art [0005] Natural gas is commonly liquefied and transported to supply major energy-consuming nations. To liquefy natural gas, the feed gas is first processed to remove contaminants and hydrocarbons heavier than at least pentane. This purified gas, typically at an elevated pressure, is then chilled through indirect heat exchange by one or more refrigeration cycles. Such refrigeration cycles are costly in terms of both capital expenditure and operation due to the complexity of the required equipment and the efficiency performance of the refrigerant. There is a need, therefore, for a method to improve refrigeratio...

Claims

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Application Information

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IPC IPC(8): F25J1/00
CPCF25B9/006F25B2400/12F25B2400/13F25J1/0022F25J1/0042F25J1/0052F25J2290/32F25J1/0097F25J1/0214F25J1/0262F25J1/0291F25J1/0292F25J1/0092F25J1/00F25J3/00C10L3/10
Inventor STONE, JOHN B.HAWRYSZ, DANIEL J.KIMBLE, E. LAWRENCE
Owner STONE JOHN B
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