Process for obtaining an ethane-rich fraction for refilling the ethane-containing refrigeration circuit of a liquefaction process for a hydrocarbon-rich fraction

摘要

In the generation of an ethane-rich fraction for use as make-up in the cooling circuit in a process for liquefying a hydrocarbon-rich fraction, a side-stream of the already liquefied hydrocarbon fraction is fed to a C1/C2/C3+ fractionating column. An ethane-rich fraction is drawn off from the middle of the fractionating column and mixed with the ethane-bearing cooling medium.