MIXTURE DIFFUSION OF SULFONATED DYES INTO CELLULOSE MEMBRANE II - EFFECTS OF ADDITION OF A DYE WITH LOWER AFFINITY ON PARALLEL DIFFUSION OFA DYE WITH HIGH AGGREGATION PROPERTY

Transport phenomena of C.I. Direct Red 2 (DR2) from a binary mixture o f dyes with a different affinity to cellulose were studied at 55 degre es C. Diffusion of DR2 with a higher affinity into water-swollen cellu lose membrane in the presence of C.I. Direct Yellow 12 (DY12) with a l ower affinity was analyzed based on a parallel transport theory of sur face and pore diffusion. It was revealed that the diffusion of DR2 in the presence of DY12 could be described by the parallel diffusion mode l, and pore diffusion for DR2 was enhanced owing to increased pore dif fusivity by addition of DY12. (C) 1998 Elsevier Science B.V. All right s reserved.