公开(公告)号：US10006699B2

公开(公告)日：2018-06-26

申请号：US15029107

申请日：2014-10-14

申请人： L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude

发明人： Alain Briglia ,  Selim Chouik

IPC分类号： F25J3/02

CPC分类号： F25J3/0233 ,  F25J3/0209 ,  F25J3/0257 ,  F25J2200/06 ,  F25J2230/08 ,  F25J2230/60 ,  F25J2235/60 ,  F25J2240/02 ,  F25J2240/40

摘要： The invention relates to a method for denitrogenation of natural gas by distillation, in which natural gas cooled in an exchange line is separated in a system of columns including at least one column, a nitrogen-enriched gas is drawn from one column of the system of columns and is heated in the exchange line, a methane-enriched liquid is drawn from one column of the system of columns, pressurized and vaporized in the exchange line at at least one vaporization pressure, and at least one portion of the cooled natural gas expands in gaseous form in a turbine and is sent to one column of the system of columns in gaseous form.