公开(公告)号：US3558702A

公开(公告)日：1971-01-26

申请号：US3558702D

申请日：1967-11-24

Applicant: SNIA VISCOSA

Inventor： PASIN ALBERTO ,  MADERNO CASANO ,  BORGO SILVANO

IPC: C07C233/00 ,  C07C103/36

CPC classification number: C07C233/00 ,  Y10S526/912

Abstract: A METHOD IS DISCLOSED FOR PURIFYING DIMETHYLFORMAMIDE, WHICH HAS BEEN OBTAINED BY RECOVERY THEREOF IN SUBSTANTIALLY NON-AQUEOUS CONDITION FROM A PROCESS FOR SPINNING ACRYLONITRILE POLYMERS AND COPOLYMERS TO PRODUCE FIBERS AND YARNS, COMPRISING TREATING THE IMPURE DIMETHYLFORMAMIDE BY CONTACTING IT WITH TWO DIFFERENT ION-EX CHANGE RESINS WHICH ARE INSOLUBLE IN DIMETHLFORMAMIDE, ONE OF WHICH IS SELECTED FROM THE GROUP OF STRONGLY ACIDIC RESINS CONSISTING OF SULPHONATED STYRENE-DIVINYL BENZENE COPOLYMERS, AND THE OTHER OF WHICH IS SELECTED FROM THE GROUP CONSISTING OF RESINS HAVING QUATERNARY AMMONIUM GROUPS IN HYDROXIDE FORM AND OF RESINS HAVING ALIPHATIC AMINO GROUPS.