Method for reducing concentrations of gaseous acid anhydrides, preferably concentration of COsub2/sub in waste gases

摘要

the application relates to how reducing concentrations of gaseous acid anhydrides, especially co2 concentration in flue gasin which the waste gases containing the abovementioned acid anhydrides in contact with the absorbent forming hydroxide solution and / or alkali metal carbonates.as a result, gaseous acid anhydrides are knotted to form salt in nahco3 and possibly a biphasic reaction mixturewhich, after removal of the precipitated nahco3 are caustic reaction.how is such that the absorbent solution essentially contains alkali metal hydroxides and salts mixture plus non adsorbing: halides, especially chloridesand / or sulfates and / or nitrates of alkali metals and / or ammonium, and total salt concentration in the absorbent is at least 5% by weight.and the concentration of alkali metal hydroxides in the absorbent is at least 0.1 m; and sodium is present in the absorbent in the molar quantity most.and regeneration in u0142ugach alkalinity poreakcyjnych is advantageously using liquid / liquid extraction.