Refrigeration – Processes – Circulating external gas
Patent
1985-07-24
1986-07-22
Sever, Frank
Refrigeration
Processes
Circulating external gas
55 29, 55 68, 62 20, F25J 302
Patent
active
046017380
ABSTRACT:
The Mehra process, for selectively extracting C.sub.2 + hydrocarbons from a raw natural gas stream to produce a residue gas stream meeting pipeline specifications and a natural gas liquid product, is improved by providing a process for purifying the liquid product. This improved process comprises injecting a stream of methanol into the stream of flashed gases from at least the final flashing stage. The injection preferably occurs prior to condensing the flashed gases and must occur prior to reaching the temperature of hydrate formation. The natural gas liquid product from the demethanizing (stripping) column is then allowed to separate into two phases in a surge vessel. The lower layer of methanol/water/physical solvent is removed, the methanol is recovered for recycling to the flashed gases. The upper layer is decanted as purified natural gas liquid product which meets specifications for gumming compounds if the raw natural gas stream is entirely sweet. If, however, the raw stream is sour or has even small quantities of acidic components, such as CO.sub.2, the purified natural gas liquid product is further sweetened with, for example, an aqueous amine treatment.
REFERENCES:
patent: 2238201 (1941-04-01), Wilson et al.
patent: 2794334 (1957-06-01), Peaslee et al.
patent: 2863527 (1958-12-01), Herbert et al.
patent: 3690816 (1972-09-01), Alleman
patent: 3702296 (1972-11-01), Arnold et al.
patent: 3886757 (1975-06-01), McClintock et al.
patent: 4233141 (1980-11-01), Beavon et al.
patent: 4302220 (1981-11-01), Volkamer et al.
patent: 4305733 (1981-12-01), Scholz et al.
patent: 4332596 (1982-06-01), Ranke et al.
patent: 4382855 (1983-05-01), Ward et al.
patent: 4406774 (1983-09-01), Cummings et al.
patent: 4430196 (1984-02-01), Niu
"New NGL Extraction Process", Gas Processors Report, Oct. 14, 1985, P.O. Box 33002, Tulsa, Okla. 74153, pp. 7 and 8.
El Paso Hydrocarbons Company
Sever Frank
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