Method of gas purification and removal of ferrous carbonate from the absorption solution

Claim 1

IN A PROCESS FOR ABSORBING AN ACID GAS IN AN ABSORPTION ZONE, WITH THE ACID GAS SELECTED FROM A GROUP CONSISTING OF CARBON DIOXIDE AND HYDROGEN SULFIDE AND MIXTURE OF THE FOREGOING, FROM A GAS STREAM, WITH AN ALKALI METAL CARBONATE SOLUTION SERVING AS THE ABSORPTION LIQUID, WITH REGENERATION OF THE CARBONATE ABSORPTION LIQUID IN A REGENERATON ZONE, AND WITH THE CARBONATE ABSORPTION LIQUID HAVING FERROUS CARBONATE IN AN AQUEOUS SOLUTION AS AN IMPURITY THEREIN; THE BICARBONATE CONCENTRATION IN THE CARBONATE ABSORPTION LIQUID BEING LESS THAN THAT AT WHICH FERROUS CARBONATE PRECIPITATES; AN IMPROVEMENT FOR REMOVING THE FERROUS CARBONATE COMPRISING THE STEPS OF PASSING A PORTION OF THE CARBONATE ABSORPTION LIQUID DIRECTLY FROM THE ABSORPTION ZONE TO A REMOVAL ZONE APART FROM THE ABSORPTION ZONE AND THE REGENERATION ZONE; TION LIQUID THE REMOVAL ZONE AT APPROXIMATELY THE TEMPERATURE OF THE LIQUID IN THE ABSORPTION ZONE;