PROCEDE D'EPURATION DE GAZ CONTENANT DES COMPOSES OXYGENES DU SOUFRE

摘要

1351583 Gas purification; sulphur INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS 2 June 1972 [8 June 1971 16 Nov 1971] 25889/72 Heading C1A In a process for removing sulphur dioxide from a sulphur dioxide containing gas the following steps occur (a) contacting the gas with a dilute aqueous solution of an alkali metal or ammonium neutral sulphite at 0-90‹ C., so as to impoverish the aqueous solution in alkali metal or ammonium neutral sulphite and enrich it in the corresponding hydrogen sulphite salt, (b) removing the gas remaining after step (a), (c) contacting the resulting solution continuously or batchwise with a weak anion exchanger so as to regenerate the dilute solution of alkali metal or ammonium neutral sulphite and increase hydrogen sulphite ion content of the anion exchanger, (d) recycling the regenerated dilute neutral sulphite solution to step (a); (e) regenerating the anion exchanger by treatment with a concentrated aqueous solution of ammonia so as to enrich the ammonia solution in ammonium sulphite, (f) reacting the ammonium sulphite or thermal decomposition products thereof with hydrogen sulphide so as to yield elemental sulphur, ammonia and water, and (g) recycling the ammonia and water as a concentrated aqueous solution of ammonia to step (c). The weak anion exchanger may be an anionic resin of the polyamine type or an amine of molecular weight greater than 200.