Patent ID: 6344066
Filing Date: 2002-02-05
Classification: B01D,C05B,C05C

Abstract:
A method for the combined production of (I) a fertilizer selected from a group consisting of ammonium nitrate, ammonium phosphates and a combination thereof through an indirect neutralization of ammonia with an acid selected from a group consisting of nitric acid, phosphoric acid and a combination thereof and of (II) a sulfur compound selected from a group consisting of elemental sulfur, SO2, sulfuric acid and sulfate salts, said method comprising:(a) contacting a sulfur oxide containing flue gas, resulting from the combustion of sulfur-containing hydrocarbons, and containing carbon dioxide in concentrations greater than that of the sulfur oxide in said gas, with ammonia and an aqueous liquor, whereby a sulfur oxide containing product is selectively formed and the resulting gas has a reduced SO2 content; (b) reacting a sulfur oxide containing product resulting from step (a) with a reagent selected from a group consisting of nitric acid, phosphoric acid, a mixture thereof and salts formed by the reaction of said acid(s) to form said fertilizer and a sulfur compound, and (c) separating at least a portion said sulfur compound from said fertilizer.