Nitrogen-methane separation process and system

Details Nitrogen-methane separation process and system Nitrogen-methane separation process and system

1977-04-11

1979-06-19

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 17, 62 39, 62 40, 62 31, F25J 302

Patent

active

041585569

ABSTRACT:
Method and system designed particularly for separating or removing nitrogen from mixtures of nitrogen and methane, particularly natural gas, over a wide range of nitrogen concentrations, employing low temperature rectification, for recovery of methane containing a substantially reduced amount of nitrogen, either as a gas or a liquid, including the features of regenerative heat exchange to cool the feed mixture to near its saturation point, prior to introduction into a fractionating column, by-passing a small stream of the feed around the regenerative heat exchanger as a means of controlling feed temperature and reboil heat in the column, passing the overhead nitrogen gas from the column in indirect heat exchange relation with the rectifying section of the column to generate reflux continuously along the separation zone, work expansion of the nitrogen waste stream to provide necessary refrigeration, providing downflow evaporation of the liquid product within the column in the case of gas producing plants, and sub-cooling the bottoms liquid product prior to evaporation of the product in the case of a gas producing plant, or prior to isentropic expansion to liquid storage in the case of a liquid producing plant.

REFERENCES:
patent: 1878123 (1932-09-01), Etienne
patent: 2499043 (1950-02-01), Voorhees
patent: 2534903 (1950-12-01), Etienne
patent: 3074245 (1963-01-01), Becker
patent: 3130026 (1964-04-01), Becker
patent: 3516262 (1970-06-01), Bernstein

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