Method for separating methane from methane-containing synthesis gas in separation unit, involves feeding capacitor with secondary portion of refrigerant of outlet temperature to intermediate temperature and cooling to lower temperature

摘要

The method involves supplying an expander (X1) and the capacitor (E5) respectively with the compressed and cooled portions of the refrigerant from the refrigerant circuit. The expander is powered by a primary portion of the refrigerant. The expander is cooled to an intermediate temperature (TI) from a starting temperature (TA). The capacitor is fed with a secondary portion of the refrigerant of the outlet temperature to the intermediate temperature and then cooled to a lower temperature (TE). An independent claim is included for device for separating methane from methane-containing synthesis gas.