ABSORBENT ADDITIVES FOR ABSORPTION PROCESS IN BIOGAS SEPARATION

摘要

This invention relates to at least one absorbent additive selected from DEPG and NMP which are additives added to an absorbent for an absorbing process separating methane from the biogas and the process separating methane gas from biogas. By using the absorbent additives, the pressure of the biogas being introduced to an absorption tower while the absorption amount of carbon dioxide is maintained, thereby reducing the cost of compression, and the absorption amount of carbon dioxide is maintained even when absorption temperature at the same absorption pressure is increased, thereby saving the cooling cost of absorbent.