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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.
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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
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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
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