Liquefying hydrocarbon-rich stream, especially natural gas stream, comprises relaxing hydrocarbon-rich stream before it is introduced into rectification stage

摘要

Liquefying a hydrocarbon-rich stream, especially a natural gas stream, comprises carrying out the liquefaction of the hydrocarbon-rich stream in heat exchange with a coolant and/or coolant mixed stream, and separating the hydrocarbon-rich stream into a C2-rich fraction (7) and a C3+-rich stream. The hydrocarbon-rich stream is relaxed before being introduced into the rectification stage (T1) and the C2-rich fraction obtained by the rectification is compressed.