FIELD: chemistry, processing technology.
SUBSTANCE: method for nitrogen elimination include condensed natural gas introduction into distillation column first position, nitrogen enriched vapour flow discharge from the distillation column head part, and purified condensed natural gas flow intake from distillation column lower part. Cold reflux flow is input into the distillation column second position, situated upwards from the first position. The method also includes either purified liquid natural gas flow cooling, or condensed natural gas flow cooling, or cooling both purified liquid natural gas flow and condensed natural gas flow.
EFFECT: nitrogen elimination with minimum methane loss, and providing forced cooling of liquid natural gas.
33 cl, 8 dwg
