VERFAHREN UND VORRICHTUNG ZUR GLEICHZEITIGEN PRODUKTION EINES ERDGASES ZUR VERFLÜSSIGUNG UND EINER FLÜSSIGEN FRAKTION AUS ERDGAS

摘要

This process includes the following steps: (a) the feed natural gas ( 101 ) is introduced into a first distillation column ( 31 ) which produces, as top product, a pretreated natural gas ( 111 ), which pretreated natural gas ( 111 ) no longer contains practically any C₆⁺ hydrocarbons; (b) the pretreated natural gas ( 111 ) is introduced into an NGL recovery unit ( 19 ) comprising at least a second distillation column ( 49 ), so as to produce, on the one hand, as column top product, a purified natural gas ( 151 ) and, on the other hand, an NGL cut ( 15 ); and (c) the said liquefiable natural gas ( 161 ) is formed from the purified natural gas ( 151 ) resulting from step (b).