Process for reducing the content of water-soluble salts of aqueous solutions of polymers containing vinylamine groups and use of the desalted polymers in the manufacture of multicomponent superabsorbent gels
Autor/es: BENNETT ANDREA KAREN (TH);MITCHELL MICHAEL A (US);CARRICO PETER W (US)
Solicitante: BASF AG (DE)
País: Alemania
Número de solicitud: EP20040722165 20040320
Clasificación de patentes: B01D61/14; B01D61/14; (IPC1-7): B01D61/14; A61L15/60; B01D63/16; C08F6/12; C08F8/12; C08L39/02; B01D61/14 (europea); C08F8/12 (europea)
Fecha de publicación de la concesión: Wed, 18/01/2006
Descripción
Process for reducing the content of water-soluble salts of aquepus solutions of polymers containing vinylamine groups by ultrafiltration to achieve a residual salt content of 1 to 10% by weight based on total salution comprising feeding an aqueous salt-conteining solution of vinylamine group caontaininf 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 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 aqueous solutions thus perified as basic water-adsorbing reisn of multicomponent superabsorbent polymers. Preferably vibratory shear memebranes in a diafiltration configuraton are used