公开(公告)号：AT419052T

公开(公告)日：2009-01-15

申请号：AT04722165

申请日：2004-03-20

Applicant: BASF SE

Inventor： BENNETT ANDREA ,  MITCHELL MICHAEL ,  CARRICO PETER

IPC: B01D61/14 ,  A61L15/60 ,  B01D61/02 ,  B01D61/04 ,  B01D61/16 ,  B01D63/16 ,  C08F6/06 ,  C08F6/12 ,  C08F8/12 ,  C08J3/03 ,  C08L39/02

Abstract: Process for reducing the content of water-soluble salts of aqueous solutions of polymers containing vinylamine groups by ultrafiltration to achieve a residual salt content of 1 to 10% by weight based on total solution solids in the polymer solution comprising feeding an aqueous salt-containing solution of vinylamine group containing polymers at a polymer concentration of at least 7% by weight to an ultrafiltration unit and removing the water-soluble salts with the permeate from the feed solution by adding thereto less than 4 parts by weight of water per one part by weight of the feed solution, and use of the polymer of the aqueous solutions thus purified as basic water-absorbing resin of multicomponent superabsorbent polymers. Preferably vibratory shear membranes in a diafiltration configuration are used.