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：US3463616A

公开(公告)日：1969-08-26

申请号：US3463616D

申请日：1966-03-18

Applicant: SNIA VISCOSA

Inventor： CORRADI DEMETRIO ,  PASIN ALBERTO

IPC: C08F220/44 ,  B01D3/42 ,  B01D3/00

CPC classification number: C08F220/44 ,  Y10S203/19

公开(公告)号：US3472827A

公开(公告)日：1969-10-14

申请号：US3472827D

申请日：1966-01-18

Applicant: SNIA VISCOSA

Inventor： PASIN ALBERTO ,  COPPOLA GIROLAMO ,  MADERNO CESANO

IPC: B01J39/04 ,  C08J11/02 ,  D01F6/18 ,  C08F1/88 ,  C08F1/08 ,  C08F3/76

CPC classification number: C08J11/02 ,  B01J39/05 ,  D01F13/04 ,  Y02P70/629 ,  B01J41/04

公开(公告)号：DE1223105B

公开(公告)日：1966-08-18

申请号：DES0074867

申请日：1961-07-17

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  PASIN ALBERTO

IPC: C07D317/38 ,  D01F6/18

公开(公告)号：IT1079106B

公开(公告)日：1985-05-08

申请号：IT1956876

申请日：1976-01-26

Applicant: SNIA VISCOSA

Inventor： CAZZARO GIORGIO ,  PASIN ALBERTO

IPC: D01F8/08 ,  D01F

公开(公告)号：DE1645330A1

公开(公告)日：1970-06-04

申请号：DE1645330

申请日：1966-03-16

Applicant: SNIA VISCOSA

Inventor： CORRADI DEMETRIO ,  PASIN ALBERTO

IPC: C08F220/44 ,  B01D3/42

Abstract: "Process for the industrial production of polyacrylonitrile base spinnable polymers", in particular for the production of a spinning solution, constituted by a copolymer in which at least 85% by weight consists of acrylonitrile in dimethylformamide, and which not more than 15% is composed of comonomers preferably comprising sodium allyl sulfonate and methyl methacrylate, characterized in that it comprises the realization of a copolymerization phase in which the comonomers, in solution in dimethylformamide, are copolymerized at a progressively increasing temperature according to a sequence controlled by regulation and programmed variation of the residual pressure in the interior of the reaction environment, so as to maintain the mass in reaction under boiling condition, with distillation, essentially under reflux, of part of the unconverted monomer and of the solvent, being determined the programming of the aforementioned boiling ratio by controlling the residual pressure as a function of the composition of said mass, said copolymerization phase continuing with a distillation step for practically total removal of the unconverted comonomer and dimethylformamide in an eventual excess for the purpose of the desired concentration for the spinning of said solution. (Machine-translation by Google Translate, not legally binding)

公开(公告)号：DE2703545A1

公开(公告)日：1977-07-28

申请号：DE2703545

申请日：1977-01-26

Applicant: SNIA VISCOSA

Inventor： CAZZARO GIORGIO ,  PASIN ALBERTO

IPC: D01F8/08

公开(公告)号：CA819164A

公开(公告)日：1969-07-29

申请号：CA819164D

Applicant: SNIA VISCOSA

Inventor： COPPOLA GIROLAMO ,  PASIN ALBERTO

公开(公告)号：DE1223104B

公开(公告)日：1966-08-18

申请号：DES0074866

申请日：1961-07-17

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  PASIN ALBERTO

IPC: D01F6/18

公开(公告)号：CA678064A

公开(公告)日：1964-01-14

申请号：CA678064D

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  PASIN ALBERTO