Patent ID: 6214310
Filing Date: 2001-04-10
Classification: B01J,C01B,C23G,Y10S

Abstract:
A process for regenerating spent acid liquor, comprising the steps of:feeding a spent acid liquor containing a metal salt into a primary roasting furnace and roasting said liquor at a first temperature to vaporize a substantial portion of the acid substantially without decomposition of said metal salt to produce an acid vapor and partially roasted metal salt;discharging said partially roasted metal salt from said roasting furnace to a secondary roasting chamber and completely roasting said metal salt to remove acid residues and substantially completely oxidize said metal salt to produce a metal oxide substantially free of acid residues;discharging said acid vapor from said primary roasting furnace and feeding to an absorption column; andfeeding an absorption liquid to said absorption column to contact said acid vapor and produce a regenerated acid solution.