Treating liquefied natural gas

摘要

Method of treating liquefied natural gas ( 1 ) to obtain a liquid stream ( 21 ) having a reduced content of components having low boiling points comprising expanding ( 3 ) the liquefied gas to expand to obtain expanded two-phase fluid; introducing the two-phase fluid into a column ( 10 ) below a gas-liquid contacting section ( 14 ); withdrawing from the bottom ( 16 ) a liquid-stream ( 17 ) having a reduced content of components having low boiling points; withdrawing from the top ( 23 ) of the column ( 10 ) a gaseous stream ( 25 ) enriched in components having low boiling points; heating the gaseous stream in a heat exchanger ( 27 ); compressing ( 30 ) the stream to fuel gas pressure to obtain fuel gas ( 33 ); separating a recycle stream ( 34 a) from the fuel gas; at least partly condensing ( 27 ) the recycle stream to obtain a reflux stream ( 34 b); and introducing the reflux stream ( 34 b) into the column ( 10 ) above the contacting section ( 14 ).