Process for purification of a gas stream by a nitrogen scrubbing

Details Process for purification of a gas stream by a nitrogen scrubbing Process for purification of a gas stream by a nitrogen scrubbing

1987-08-12

1988-08-23

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 38, 62 40, 62 41, F25J 302

Patent

active

047658142

ABSTRACT:
In a process proposed for purification of a gas stream at elevated pressure by nitrogen scrubbing, the gas stream to be purified and the nitrogen scrubbing stream are initially cooled to low temperatures. The gas stream is then scrubbed with liquid nitrogen and the purified gas stream is mixed with cooled, high-pressure nitrogen to form a mixture in which nitrogen accumulates partly as a liquid phase. The mixture thus formed is then heated and the liquid nitrogen contained therein is evaporated. Prior to scrubbing, either the nitrogen scrubbing stream itself or a partial stream of the nitrogen scrubbing stream or another process stream under a pressure lower than the working pressure of the nitrogen scrubbing step is at least partly condensed and then pumped to a higher pressure. The condensation of this low-pressure stream provides a reduction in the temperature difference at the cold end of the heat exchangers upstream of the scrubbing step resulting in the reduction of the energy requirements of the process.

REFERENCES:
patent: 3312075 (1967-04-01), Becker

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