Systems and processes for removal of pollutants from a gas stream

An adaptable system for dry removal of carbon monoxide and/or carbon dioxide from gases with minimal differential pressure across the system, comprising:

• A. A feeder containing a supply of sorbent of regenerable oxides of manganese and/or regenerated oxides of manganese;
• wherein the feeder is configured to handle and feed oxides of manganese which, upon regeneration, are in particle form and are defined by the chemical formula MnOX, where X is about 1.5 to 2.0 and wherein the oxides of manganese have a particle size of less than about 0.1 to about 500 microns and a BET value ranging from about 1 to about 1000 m2/g;
• B. At least one reaction zone configured for introduction of the sorbent and a gas containing carbon monoxide and/or carbon dioxide where the gas is introduced at temperatures typically ranging from ambient temperature to below the thermal decomposition temperature(s) of carbonates of manganese carbonate and contacted with the sorbent for a time sufficient to effect the capture of carbon monoxide and/or carbon dioxide at a targeted capture rate set point, the carbon monoxide and/or carbon dioxide being captured by reacting with the sorbent to formcarbonates of manganese to substantially strip the gas of carbon monoxide and/or carbon dioxide the reaction zone being further configured to render the gas that has been substantially stripped of carbon monoxide and/or carbon dioxide free of reacted and unreacted sorbent so that the gas may be vented from the reaction zone;
• and wherein differential pressure within the system is regulated so that any differential pressure across the system is no greater than a predetermined level.

Process for the regeneration of oxides of manganese from a solution containing sulfate and nitrate anions and manganese cations formed when the reaction product of the removal of SOX and NOX from a gas stream with a sorbent of oxides of manganese, comprising the steps of:

• A. providing first and second anion exchangers having an anion exchange resin loaded therein, the anion exchange resin having chloride in the exchange position on the resin;
• B. passing a solution containing sulfate and nitrate anions through the first anion exchanger to elute the chloride to form manganese chloride while capturing the sulfate anion on the resin;
• C. passing the solution containing nitrate anions through the second anion exchanger to elute the chloride to form manganese chloride while capturing the nitrate anion on the resin;
• D. adding a soluble carbonate or hydroxide compound to the solution to precipitate manganese carbonate or manganese hydroxide;
• D. separating the manganese carbonate or manganese hydroxide from the solution;
• and
• E. heating the manganese carbonate or manganese hydroxide to form regenerated oxides of manganese.