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    • 2. 发明申请
    • Method for purifying caprolactam
    • 己内酰胺纯化方法
    • US20060090994A1
    • 2006-05-04
    • US10534822
    • 2003-11-11
    • Hermann LuykenAndreas AnsmannChristoph BenischPeter BablerRolf-Hartmuth FischerStefan MaixnerJohann-Peter Melder
    • Hermann LuykenAndreas AnsmannChristoph BenischPeter BablerRolf-Hartmuth FischerStefan MaixnerJohann-Peter Melder
    • B01D3/34C07C51/44
    • C07D201/16
    • A process for purifying crude caprolactam which has been obtained by 1) converting a mixture (I) comprising 6-aminocapronitrile and water to a mixture (II) comprising caprolactam, ammonia, water, high boilers and low boilers in the presence of a catalyst, then 2) removing ammonia from mixture (II) to obtain a mixture (III) comprising caprolactam, water, high boilers and low boilers, then 3) completely or partly removing water from mixture (III) to obtain crude caprolactam (IV) comprising caprolactam, high boilers and low boilers, which comprises a) feeding the crude caprolactam and an inorganic acid which has a boiling point above the boiling point of caprolactam under the distillation conditions of the following steps b) to h) to a first distillation apparatus C1, b) distilling the crude caprolactam and the inorganic acid in the first distillation apparatus C1, and removing a first substream in the bottom region and a second substream in the top region of the distillation apparatus C1, c) feeding the second substream from step b) to a second distillation apparatus C2, d) distilling the second substream from step b) in the second distillation apparatus C2, and removing a first substream in the bottom region and a second substream in the top region of the distillation apparatus C2, e) feeding the first substream from step d) to a third distillation apparatus C3, f) distilling the first substream from d) in the third distillation apparatus C3, and removing a first substream in the bottom region and purified caprolactam in the top region of distillation apparatus C3, and g) feeding the first substream from step f) to the first distillation apparatus C1.
    • 一种纯化己内酰胺的方法,其通过以下步骤获得:1)在催化剂存在下,将包含6-氨基己腈和水的混合物(I)转化为包含己内酰胺,氨,水,高锅炉和低沸点的混合物(II) 然后2)从混合物(II)中除去氨以获得包含己内酰胺,水,高锅炉和低锅炉的混合物(III),然后3)从混合物(III)中完全或部分除去水,得到包含己内酰胺的粗己内酰胺(IV) ,高沸点锅炉和低锅炉,其包括:a)在第一蒸馏装置C1的下述步骤b)至h)的蒸馏条件下,将粗己内酰胺和沸点高于己内酰胺沸点的无机酸, b)在第一蒸馏装置C1中蒸馏粗己内酰胺和无机酸,并且除去蒸馏装置C1的顶部区域中的第一子流和顶部区域中的第二子流 c)将来自步骤b)的第二子流进料到第二蒸馏装置C2,d)在第二蒸馏装置C2中蒸馏步骤b)中的第二子流,并且除去第二蒸馏装置C2中的第一子流, e)蒸馏装置C2的顶部区域,e)将来自步骤d)的第一子流进料到第三蒸馏装置C3,f)将第一子流从d)蒸馏到第三蒸馏装置C3中,并且除去底部区域中的第一子流 和在蒸馏装置C3的顶部区域中纯化的己内酰胺,并且g)将来自步骤f)的第一子流进料到第一蒸馏装置C1。