PURPOSE:To obtain high-purity ammonium sulfite and an acidic aqueous soln. of ammonium sulfite by decomposing ammonium sulfate in two stage to form ammonia and sulfur dioxide, which are then washed with molten sulfur and polyethylene glycol. CONSTITUTION:(NH4)2SO4 is thermally decomposed at =250 deg.C until the N/S atomic ratio becomes 1-1.5 to form an NH4HSO4-contg. composition and NH3. The composition is thermally decomposed at 250-440 deg.C in molten S to form a decomposed gas having a composition with an NH3/SO2 molar ratio of =1 and an H2O/SO2 molar taio of =0.67. This gas is then washed with molten S at 130- 250 deg.C and further washed with polyethylene glycol of 130-250 deg.C to remove sulfur, obtaining a purified decomposed gas. This gas is allowed to be absorbed in water or an aqueous ammonia soln. Thus, high-purity ammonium sulfite and an acidic aqueous soln. of ammonium sulfite are obtd.
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机译：目的：获得高纯度的亚硫酸铵和酸性水溶液。分两步将硫酸铵分解生成氨和二氧化硫，生成亚硫酸铵，然后用熔融的硫和聚乙二醇洗涤。组成：（NH4）2SO4在> = 250℃时热分解，直到N / S原子比变为1-1.5为止，形成NH4HSO4-contg。组成和NH3。将该组合物在熔融S中在250-440℃下热分解以形成分解气体，该分解气体具有NH 3 / SO 2摩尔比≤1且H 2 O / SO 2摩尔理论值≤0.67的组成。然后用130-250℃的熔融S洗涤该气体，再用130-250℃的聚乙二醇洗涤，以除去硫，得到纯化的分解气体。使该气体吸收在水或氨水溶液中。因此，需要使用高纯度亚硫酸铵和酸性水溶液。不含亚硫酸铵。
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