< P & gt recovery of propane and adjustable ethane from natural gas/

摘要

A method for simultaneously producing treated natural gas and propane rich current from feed gas comprises the following steps: step a: partially condensing feed gas;(b) Step (b): dividing the gas generated in step (a) into a first liquid flow and a first gas flow;(c) Step (c): at least relax a part of the first airflow generated by step (b);(d) Step (d): introduce the gas generated in step (c) into the first distillation column;It is characterized in that it comprises any of the following steps: step (f): to obtain an ethane extraction rate exceeding the first threshold value, In the first step (b), at least a portion of the first gas stream is condensed and introduced into the phase separator pot to generate a second gas flow and a second liquid flow, wherein at least a portion of the second gas stream is condensed and introduced into the first distillation column.In order to obtain ethane extraction rate below the second threshold, the recovered gas is cut at the top of the second distillation column, then the condensed gas is cut, and then introduced into the first distillation column.