Method and apparatus for purification of high N2 content gas

摘要

Nitrogen and methane are separated in a nitrogen-methane cryogenic fractionator operating at a temperature between the boiling points of nitrogen and methane. A distillative aid or absorbent is injected into the nitrogen-methane cryogenic fractionator for enhancing separation, for enabling an increase in operating pressure, and for enabling a high separation rate at relatively high temperature.