公开(公告)号：KR860000515B1

公开(公告)日：1986-05-02

申请号：KR820001971

申请日：1982-05-06

Applicant: STAMICARBON

Inventor： RULKANS PETER F M ,  HAASEN NICOLAAS F ,  PLANTEMA OTTO G

IPC: B01D3/14 ,  C07D201/16

Abstract: The purifn. of epsilon-caprolactam (I), which is obtd. by the rearrangement of cyclohexanone oxine by H2SO4 or oleum and is used as an intermediate for Nylon, comprises a two-stage vacuum distn. The crude(I) is passed to the first column, which has an evaporator with a packed column with a pressure drop of less than 2.5 mbar per theoretical tray, and from which low b.p. impurities are removed as overheads. The bottom prods. are passed to the second column wherepure(I) is septd. as overhead and the high b.p. impurities as bottoms.