Patent ID: 8858906

Claim:
A process for removing CO 2 from a gas, the process comprising the steps of: (a) removing CO 2 from the gas by contacting the gas with an absorbing liquid selected from either N,N′-di(hydroxyalkyl)piperazine, N,N,N′,N′-tetrakis(hydroxyalkyl)-1,6-hexanediamine or tertiary alkylamine sulfonic acid compounds in an absorber to obtain an absorbing liquid enriched in CO 2 and a purified gas; (b) heating the absorbing liquid enriched CO 2 to obtain a heated absorbing liquid enriched in CO 2 ; and (c) contacting the heated absorbing liquid enriched in CO 2 with a stripping gas at an elevated temperature in a regenerator to obtain a regenerated absorbing liquid and a hot gas stream enriched in CO 2 ; wherein 30% of the absorbing liquid enriched in CO 2 is heated through external heat exchange with the hot gas stream enriched in CO 2 .