公开(公告)号：US3541080A

公开(公告)日：1970-11-17

申请号：US3541080D

申请日：1967-07-24

Applicant: TORAY INDUSTRIES

Inventor： WAKAMATSU SHIGERU ,  KONDO RYOZO ,  SHINOMIYA MASAYASU ,  OKAMOTO MASARU

IPC: B23K9/12 ,  C07D201/04 ,  C07D201/10 ,  C07D41/06

CPC classification number: C07D201/10 ,  B23K9/125 ,  C07D201/04

公开(公告)号：US3700669A

公开(公告)日：1972-10-24

申请号：US3700669D

申请日：1968-10-31

Applicant: TORAY INDUSTRIES

Inventor： WAKAMATSU SHIGERU ,  KONDO RYOZO ,  SHINOMIYA MASAYASU

IPC: C07D201/16 ,  C07D41/06

CPC classification number: C07D201/16

Abstract: BY EXTRACTING A LACTAM-CONTAINING REACTION MIXTURE OBTAINED FROM THE BECKMANN REARRANGEMENT REACTION OF A CYCLIC KETOXIME IN THE PRESENCE OF WATER WITH LIQUID SULFUR DIOXIDE, THE LACTAM CAN BE EFFECTIVELY SEPARATED IN THE PURE STATE.