Patent ID: 8152891
Filing Date: 2012-04-10
Classification: C05B,C05C

Abstract:
1. A method for the combined production of (I) a sulfur oxide containing product and (II) an ammonium nitrate fertilizer, through an indirect neutralization of ammonia with nitric acid, said method comprising: a. contacting a precipitate containing calcium sulfite with a solution of nitric acid and a solution of ammonia in two separate steps, to form said fertilizer, said sulfur oxide containing product and a precipitate containing calcium hydroxide, wherein said precipitate containing calcium sulfite is contacted first with a solution of nitric acid to form said sulfur oxide and a calcium nitrate solution, and further wherein said calcium nitrate solution is then contacted with an ammonia solution to form said fertilizer as an ammonium nitrate containing product and a precipitate containing calcium hydroxide; and b. separating at least a portion of said fertilizer, said sulfur oxide and said calcium hydroxide into three separated streams.