System and process for capture of acid gasses at elevated pressure from gaseous process streams

A method for removing CO2 from a gaseous volume comprising the steps of:

• contacting a dry gaseous stream or volume containing CO2 with at least one CO2 binding organic compound containing a neat (anhydrous) tertiary alkanolamine that chemically binds CO2 to form a zwitterionic product at a pressure greater than 100 psi to remove CO2 from said gaseous stream or volume;
• removing said zwitterionic product from said dry gaseous stream or volume;
• and
• depressurizing said zwitterionic product in the absence of added heat to release chemically bound CO2 therefrom to regenerate said CO2 binding organic compound.