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    • 26. 发明授权
    • Process for obtaining coarsely crystalline pure ammonium sulfate
    • 获得粗结晶纯硫酸铵的方法
    • US4138472A
    • 1979-02-06
    • US844647
    • 1977-10-25
    • Gerald NeubauerGerard Van WauweJosef BeullensUwe BrandHugo FuchsKlaus Kartte
    • Gerald NeubauerGerard Van WauweJosef BeullensUwe BrandHugo FuchsKlaus Kartte
    • C01C1/242C01C1/248
    • C01C1/242C01C1/248
    • A process for obtaining coarsely crystalline pure ammonium sulfate from reaction mixtures which have been obtained by Beckmann rearrangement of cyclohexanone-oxime with sulfuric acid or oleum, by neutralizing the mixtures with ammonia at an elevated temperature, with the addition of recycled ammonium sulfate mother liquor, the concentration being so chosen that during the neutralization no solid ammonium sulfate precipitates, separating the crude caprolactam from the ammonium sulfate solution, crystallizing ammonium sulfate by evaporating the ammonium sulfate solution under reduced pressure, separating off the crystallized ammonium sulfate and recycling the mother liquor to the neutralization stage. The neutralization is carried out at from 80.degree. to 115.degree. C. under autogenous pressure and the ammonium sulfate solution obtained after separating off the crude lactam is evaporated under a pressure of from 200 to 600 mm Hg while cooling to from 72.degree. to 101.degree. C.
    • 从反应混合物中获得粗结晶纯硫酸铵的方法,其通过用硫酸或发烟硫酸重整环己酮 - 肟,通过在升高的温度下用氨中和混合物,再加入回收的硫酸铵母液, 浓度如此选择,使得在中和期间没有固体硫酸铵沉淀,将粗己内酰胺与硫酸铵溶液分离,通过在减压下蒸发硫酸铵溶液使硫酸铵结晶,分离结晶的硫酸铵并将母液再循环至 中和阶段。 中和在自生压力下在80〜115℃进行,分离出内酰胺后得到的硫酸铵溶液在200〜600mmHg的压力下蒸发,同时冷却至72〜101℃。 C。