| 摘要 |
There is disclosed a process for the recovery of sulfuric acid and ammonia from diammonium sulfate which comprises the steps of heating diammonium sulfate to a temperature sufficient to effect the thermal decomposition of diammonium sulfate to ammonium hydrogen sulfate and ammonia, introducing the resulting ammonium hydrogen sulfate into a solution comprising 10 to 45 weight per cent H2O, 41 to 74 weight per cent SO4, 0.1 to 0.7 weight per cent H<-> and 13.5 to 15.5 weight per cent NH4 to form a charged brine, contacting the charged brine with a solvent which is substantially water immiscible and which extracts H2SO4 preferentially over ammonium sulfates so that H2SO4 is selectively extracted from the brine and ammonium sulfate solids having molar ratios of NH4 to SO4 ranging from above 1:1 to about 2:1 crystallize out of solution, and extracting the solvent loaded with H2SO4 with water to obtain a solution of sulfuric acid. |
