Low temperature process for separating propane and heavier hydro

Details Low temperature process for separating propane and heavier hydro Low temperature process for separating propane and heavier hydro

1978-12-15

1981-02-17

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 38, F25J 302

Patent

active

042512492

ABSTRACT:
A process for low temperature fractionation of natural gas to recover as product propane and the heavier hydrocarbons with an efficiency of 90% or greater and an ethane content rejection of 90% or more. The process includes passage of the natural gas through several refrigeration zones followed by a first separation stage to separate liquid condensate from C.sub.1, C.sub.2 and C.sub.3 hydrocarbon gas. The gas stream is cooled further by expansion followed by a second separation stage to separate liquid containing C.sub.1, C.sub.2 and C.sub.3 hydrocarbons from the gas which contains only C.sub.1 and C.sub.2 hydrocarbons. Both streams are fed to a de-ethanizer fractionating column, with the liquid entering at a point intermediate the ends and the gas being utilized in a reflux condenser internal to the column above the point of entry of the liquid stream. Employment of the low temperature C.sub.1, C.sub.2 hydrocarbon gas in a reflux condenser in the column provides the necessary refrigeration to condense the propane and heavier constituents of the inlet gas and reject the methane and ethane.

REFERENCES:
patent: 2645104 (1953-07-01), Kniel
patent: 3274787 (1966-09-01), Grenier et al.
patent: 3397138 (1968-08-01), Bacon
patent: 3516262 (1970-06-01), Bernstein
patent: 3589137 (1971-06-01), Hoffman
patent: 3797261 (1974-03-01), Juncker et al.
patent: 4061481 (1977-12-01), Campbell et al.

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