METHOD OF LIQUEFYING AND TREATING A NATURAL GAS

摘要

Method of liquefying and treating natural gas containing components having low boiling points, which method comprises liquefying natural gas in a main heat exchanger; cooling the liquefied gas (8) in an external heat exchanger (41'); allowing the cooled liquefied gas to expand dynamically (48); introducing the expanded fluid in the upper part of a fractionation column (51); allowing the liquid of the expanded fluid to flour downwards through contacting section (58); withdrawing a liquid recycle stream (70) which is passed through the heat exchanger (41') to obtain a heated two-phase fluid; introducing the two-phase fluid (70) in fractionation column (51), and allowing the vapour to flow through the contacting section (58); collecting the liquid of the two-phase fluid in the lower part (59) of the fractionation column (51), and withdrawing therefrom a liquid product stream (78) having a reduced content of components having low boiling points; and withdrawing from the fractionation column (51) a gaseous stream (79) which is enriched in components having low boiling points.