METHOD FOR SEPARATING A FRACTION RICH IN C2+ FROM LIQUEFIED NATURAL GAS

摘要

The invention C _{2 +} - liquefied rich classification natural gas (LNG ) relates to a method for the separation from, the method comprising: ; a) partially vaporizing the liquefied natural gas (1 ') (E2) stage, ; b) the partial by evaporating natural gas (2) of Article 1 C ₁ - rich in gas classification (4) and Article 1 C _{2 +} --rich liquid category (3) separation (D1) stage, ; c) of the first C _{2 +} - rich liquid category (3) C of the first 2 ₁ -rich gas classification (8) and the second of the C _{2 +} - rich liquid category (10) as a rectifier for separating formula (T) stage, ; d) wherein 1 of C ₁ - re-rich gas liquefaction classification (4) (E1) stage, and ; e) The re-liquefied C ₁ - includes the step of providing a reverse flow in the at least one partial flow (6) the expression rectification separation device (T) of the rich gas classification (5)