Refrigeration – Processes – Circulating external gas
Patent
1982-05-03
1983-12-20
Sever, Frank
Refrigeration
Processes
Circulating external gas
62 23, F25J 102
Patent
active
044215355
ABSTRACT:
A sweet natural gas stream is stripped of water and hydrocarbon components heavier than methane to substantially any selected degree by countercurrent extraction with polyethylene glycol dimethyl ether while at pipeline pressures. The stripped natural gas meets pipeline specifications. The rich polyethylene glycol dimethyl ether is let down in pressure through selected successive stages which respectively isolate fractions that are rich in ethane, propane, butanes, and hydrocarbons heavier than butane. Lastly, waste water is removed from the solvent to regenerate the polyethylene glycol dimethyl ether. The separated gas streams of ethane, propane, butanes, and hydrocarbons heavier than butanes are individually compressed, combined, condensed and cooled to form a natural gas liquid stream, suitable for pipeline shipment. A sour natural gas stream may also be treated in the same equipment if adequate solvent quantities are employed to remove water and acidic components from the sour gas and if a sweetening unit is added to remove the acidic components from the combined liquid hydrocarbon stream.
REFERENCES:
patent: 4252548 (1981-02-01), Markbreiter et al.
El Paso Hydrocarbons Company
Sever Frank
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