Process for separating and recovering carbon dioxide from gaseous mixtures

Claim 1

IN A METHOD OF REMOVING CARBON DIOXIDE FROM A GASEOUS MIXTURE CONTAINING IT WHICH COMPRISES THE STEPS OF BRINGING SAID GASEOUS MIXTURE INTO CONTACT WITH AN AQUEOUS SOLUTION OF AN ALKALINE ABSORBENT FOR SAID CARBON DIOXIDE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AMINO ALCOHOLS AND CARBONATES, PHOSPHATES, BORATES, MONOVALENT PHENOLATES AND POLYVALENT PHENOLATES OF A MEMBER OF THE GROUP CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM TO EFFECT ABSORPTION OF SAID CARBON DIOXIDE, AND REGENERATING SAID AQUEOUS SOLUTION AFTER CONTACT WITH SAID GASEOUS MIXTURE BY HEATING TO EXPEL ABSORBED CARBON DIOXIDE, THE FURTHER STEP WHICH COMPRISES INCORPORATING IN SAID FIRST-NAMED SOLUTION BEFORE CONTACT WITH SAID GASEOUS MIXTURE, AN ABSORPTION ACTIVATING AGENT SELECTED FROM THE GROUP CONSISTING OF SELENIOUS ACID, TELLUROUS ACID AND THEIR ALKALI METAL SALTS.