Patent ID: 6964181

Claim:
A process for controlling a heating value of a produced residue LNG stream from a feed LNG stream rich in compounds such C2+ compounds, the process comprising the steps of: supplying and pumping a feed stream to a pressure that allows re-liquefaction of a residue LNG stream; warming the feed stream to a first temperature defining a first enthalpy; splitting the feed stream into a first tower feed stream and a second tower feed stream; warming the second tower feed stream to a second temperature different from the first temperature defining a second enthalpy different from the first enthalpy; supplying a tower with the first and second tower feed streams, the tower producing an overhead stream and a natural gas liquids stream; cooling and then pumping the tower overhead stream to produce the residue LNG stream; and allowing for the splitting of the feed stream such that the natural gas liquids stream contains a major portion of the recovered C2+ compounds and the tower overhead stream has a methane concentration in a predefined concentration range.