Kinetics and mass transfer for supercritical fluid extraction of wood

Abstract

Rates of extraction of lignin from white fir sapwood with supercritical tert-butyl alcohol were measured dynamically in a continuous-flow system. The extraction rate increased with temperature and pressure but was independent of particle size and flow rate for our experimental conditions.

Reactions at supercritical conditions: Applications and fundamentals

“…Goto et al (1990a) used a flow system and SC t-butanol for the reactive extraction of volatiles and degradation products from cellulose at temperatures between 220 and 300°C. Consistent with earlier investigators, they found that the presence of the SCF reduced char formation.…”

Characterization of packed beds of plant materials processed by supercritical fluid extraction

“…There are several models presented in the literature for calculating the extraction curves obtained by supercritical fluid extraction (SFE) of different plants (Brunner, 1984;Reverchon et al, 1993;Sovová et al, 1994b;Sovová et al, 1995;Goto et al, 1990;Esquível et al, 1999;Cocero and García, 2001;Ferreira and Meireles, 2002;MonteroVázquez et al, 2003;Quispe-Condori et al, 2005). Phenomenological models of the extraction process consist of mass balance equations for solute in solid and fluid phases, respectively.…”

Modeling of supercritical extraction of organics from solid matrices

“…Other applications include purification of polymers (McHugh and Krukonis, 1986) and extraction of lignocellulosic material from wood (Li and Kiran, 1987;Goto et al, 1990).…”