Coupled model of film theory and the Nernst–Planck equation in nanofiltration

Coupled model of extended Nernst–Planck equation and film theory in nanofiltration for xylo-oligosaccharide syrup

“…Nanofiltration (NF) is an effective method for the purification of XOs syrups (Vandanjon et al, 2007;Mellal et al, 2008;Tsui and Cheryan, 2007) by using membrane of proper molecular weight cut-offs (MWCO) between xylose/arabinose (150 Da) and xylobiose (282 Da). Also, its surface electrostatic properties allow inorganic salts to transmit (Chaabane et al, 2007). The application of membrane techniques in removing undesirable components and selecting XOs within given degree of polymerization (DP) rapidly increased in recent years (Vazquez et al, 2000;Moure et al, 2006;Vegas et al, 2006;Swennen et al, 2005;Izumi et al, 2002;Pineloa et al, 2009).…”

“…NF processing on salts was widely investigated and different separation models have been established (Chaabane et al, 2007). Unfortunately, the effective model for predicting NF process on XOs syrups has not been proposed.…”

“…This work presented an observed retention (R obs ) model established on the basis of extended Nernst-Planck equation (ENP) (Chaabane et al, 2007;Gozálvez-Zafrilla and Santafé-Moros, 2008) and film theory (Chaabane et al, 2007). According to ENP equation, the real retention (R real ) can be calculated using experimental volume flux (J v ), solute concentration at membrane surface (C m ) and solute concentration in permeate (C p ) (Eq.…”

Integration of Reverse‐Osmosis Unit Operations in Biotechnology Process Design

“…Nowadays, membrane processes are becoming one of the most important versatile technologies [7]. Among these technologies, RO is one of the most recently developed processes.…”

“…In addition to CP, cake formation is coupled to BV II. The major effect of limited permeate flux in a cross-flow module over time is caused by CP [7,18]. Due to typically high solvent velocities, the deposit layer is correctly assumed to be of locally uniform thickness [9,18].…”