Integrated NGL recovery in the production of liquefied natural gas

Inactive Publication Date: 2008-01-24
AIR PROD & CHEM INC
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  • Claims
  • Application Information

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Benefits of technology

[0030](g) piping and pump or pumps adapted to transfer unrecovered liquid hydrocarbons from the one or more additio...

Problems solved by technology

Some of these constituents, such as water, hydrogen sulfide, carbon dioxide, and mercury, are contaminants which are harmful to downstream steps su...

Method used

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  • Integrated NGL recovery in the production of liquefied natural gas
  • Integrated NGL recovery in the production of liquefied natural gas
  • Integrated NGL recovery in the production of liquefied natural gas

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example

[0086]A process simulation was carried out to illustrate the embodiment of FIG. 1. A pre-purified natural gas stream in line 100 has a flow rate of 100,000 μmol / hr and pressure of 960 psia and contains (in mole %) 1.9% helium, 5.8% nitrogen, 83.2% methane, 7.1% ethane, 2.3% propane, 0.4% isobutane, 0.6% butane, 0.1% isopentane, 0.2% pentane, and 0.2% hexanes. The stream is cooled by three stages of propane cooling to −29° F., is further cooled in the economizer heat exchanger to −62.8° F., and is fed to scrub column 118. The column operates at an average pressure of 886 psia. Column overhead in line 120 at a flow rate of 104,770 lbmol / hr is warmed from −73° F. to −32° F. against the feed in heat exchanger 114. The resulting stream in line 122 is cooled and liquefied in passage 123 of the warm bundle of main heat exchanger 124 to provide a condensed methane-enriched stream in line 125. A portion of this liquid is withdrawn via line 126 at a flow rate of 10,943 lbmol / hr and temperatur...

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Abstract

Process for the liquefaction of natural gas and the recovery of components heavier than methane wherein natural gas is cooled and separated in a first distillation column into an overhead vapor enriched in methane and a bottoms stream enriched in components heavier than methane, wherein the first distillation column utilizes a liquefied methane-containing reflux stream. This reflux stream may be provided by a condensed portion of the overhead vapor or a portion of totally condensed overhead vapor that is subsequently warmed. The bottoms stream may be separated in one or more additional distillation columns to provide one or more product streams, any of which are partially or totally withdrawn as recovered hydrocarbons. A stream of unrecovered liquid hydrocarbons may be combined with either the condensed portion of the overhead vapor or a portion of totally condensed overhead vapor that is subsequently warmed.

Description

BACKGROUND OF THE INVENTION[0001]Raw natural gas comprises primarily methane and also contains numerous minor constituents which may include water, hydrogen sulfide, carbon dioxide, mercury, nitrogen, and light hydrocarbons typically having two to six carbon atoms. Some of these constituents, such as water, hydrogen sulfide, carbon dioxide, and mercury, are contaminants which are harmful to downstream steps such as natural gas processing or the production of liquefied natural gas (LNG), and these contaminants must be removed upstream of these processing steps. The hydrocarbons heavier than methane typically are condensed and recovered as natural gas liquids (NGL) and fractionated to yield valuable hydrocarbon products.[0002]The first step in the NGL recovery process utilizes a distillation column or scrub column to separate the hydrocarbons heavier than methane from the pretreated natural gas feed to yield purified methane for liquefaction and NGL for separation and recovery. This p...

Claims

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Application Information

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IPC IPC(8): F25J1/00F25J3/00
CPCF25J1/0022F25J1/0216F25J1/0045F25J1/0052F25J1/0055F25J1/0241F25J1/0247F25J1/0264F25J1/0265F25J3/0209F25J3/0233F25J3/0238F25J3/0242F25J3/0247F25J2200/04F25J2200/30F25J2200/70F25J2200/72F25J2200/78F25J2205/50F25J2215/62F25J2215/64F25J2215/66F25J2245/02F25J2270/12F25J2270/66F25J2280/10F25J1/0231F25J1/004F25J1/0262F25J2205/30F25J3/00C10L3/06
Inventor BROSTOW, ADAM ADRIANROBERTS, MARK JULIAN
Owner AIR PROD & CHEM INC
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