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.

公开(公告)号：DE1058511B

公开(公告)日：1959-06-04

申请号：DEP0013656

申请日：1955-02-26

Applicant: SNIA VISCOSA

Inventor： MUENCH WERNER ,  MADERNO CASANO ,  MESSINA GIUSEPPE

IPC: B01J19/00 ,  B01J19/26 ,  C07C51/21 ,  C07C51/215 ,  C07C51/265 ,  C07C409/18 ,  C07F15/00

Abstract: A device for use in oxidation reactions in the liquid phase with gases comprises a gas delivery nozzle 6, usually 1 mm. in diameter, positioned in a tubular mixing chamber 5, which is closed by a plate 4 and is perforated, except in the middle portion of the chamber, for the free passage of liquid from the reaction container into which the device is inserted. A further mixing chamber 2 with plates or sieves 1 may be attached to the first mixing chamber.