公开(公告)号：GB1114161A

公开(公告)日：1968-05-15

申请号：GB3765565

申请日：1965-09-03

Applicant: BASF AG

Inventor： SPOOR HERBERT ,  POHLEMANN HEINZ ,  HEIL EDUARD ,  MUENSTER ALFRED ,  PFAFF PETER

IPC: C08J3/14

Abstract: A process for recovering water-soluble polymers in solid form from their highly viscous aqueous solutions comprises breaking up an aqueous solution of the polymer having a viscosity of at least 105 centipoises into small particles, introducing the latter into an organic liquid, which is substantially water-immiscible, to form a suspension of the polymer in the organic liquid, dehydrating the suspension by azeotropic distillation, and separating the suspended polymer particles from the organic liquid. Suitable organic liquids include heptane, carbon tetrachloride, tetrachloroethylene, amyl acetate, dibutyl ether, benzene, toluene, xylene and mixtures thereof. Suitable polymers include those of acrylamide, methacrylamide, acrylic acid, methacrylic acid, N-vinyl pyrrolidone, vinyl sulphonic acid, styrene sulphonic acid and N-vinyl imidazole, which compounds may possibly be copolymerized with, for example, acrylonitrile, methyl acrylate, vinyl acetate, vinyl chloride and, also, small amounts of crosslinking monomers. An example illustrates the recovery of an acrylamide/ammonium acrylate copolymer prepared by polymerizing the corresponding monomers in aqueous solution using an ammonium persulphate / sodium formaldehyde sulphoxylate catalyst.

公开(公告)号：FR1338749A

公开(公告)日：1963-09-27

申请号：FR914650

申请日：1962-11-07

Applicant: BASF AG

Inventor： NIESWANDT WERNER ,  PFAFF PETER ,  STUEBER GEORG ,  BILLE HEINZ

公开(公告)号：FR1338230A

公开(公告)日：1963-09-20

申请号：FR914649

申请日：1962-11-07

Applicant: BASF AG

Inventor： NIESWANDT WERNER ,  PFAFF PETER ,  STUEBER GEORG ,  BILLE HEINZ

IPC: C07D201/16