Process for purification of a gas stream by a nitrogen scrubbing

Abstract From the Canadian patent

A NITROGEN SCRUBBING" ABSTRACT OF THE DISCLOSURE, 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 …