CONTINUOUS PROCESS FOR RECOVERY OF CAPROLACTAM AND CRYSTALLINE AMMONIUM SULFATE

摘要

Present application discloses an industrial scale continuous process for recovery of caprolactam and crystalline ammonium sulfate. By controlling the weight ratio of the amount of aqueous ammonium sulfate solution being recycled to the amount of Beckmann rearrangement mixture charged into the neutralization section within the range of more than 0.001 and less than 1, the productivity of the crystalline ammonium sulfate is increased, however neither the color of the crystalline ammonium sulfate nor the quality of the produced pure caprolactam is unduly influenced.