Abstract
In this article, a phenomenological model is proposed for alkali impregnation and hot water extraction of wood. Elementary reaction kinetics, ion exchange (IE) equilibrium, and mass transfer rates are considered in the model. IE is a consequence of the dissociation of the covalently bound uronic acid and phenolic groups in the wood fiber wall (FW). Due to this effect, the molality of cations is higher in the FW liquid than in the liquid external to the FW, whereas the opposite is true for anions. For the development of kinetic models under the participation of hydroxyl and hydrogen ions, the estimation of their molalities in these two liquid phases is crucial because of their ubiquitous presence in chemical reactions. This study applies a recently developed physicochemical modeling environment in which alkali impregnation and hot water extraction processes are considered. The simulations revealed that the IE effect is significant and affects the chemical reaction kinetics in both processes in focus. Furthermore, the IE effect does not remain constant but varies as a function of treatment time.
Financial support from FIBIC Ltd. (EffFibre and Fubio Joint Research 2 Research Programmes) is gratefully acknowledged. Pablo Montagna, Miguel Zanuttini, Marc Borrega, Herbert Sixta, and Tao Song are thanked for providing us the experimental data.
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Artikel in diesem Heft
- Masthead
- Masthead
- Original Articles
- Biorefinery in a pulp mill: simultaneous production of cellulosic fibers from Eucalyptus globulus by soda-anthraquinone cooking and surface-active agents
- Thermomechanical pulping of novel Brazilian Eucalyptus hybrids
- Contribution of xylan to the brightness development and stability in the final ECF bleaching of eucalypt (Eucalyptus globulus Labill.) kraft pulp
- Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls
- The role of Donnan effect in kraft cooking liquor impregnation and hot water extraction of wood
- Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
- Laser-induced fluorescence (LIF) of lignin and lignin model compounds in Raman spectroscopy
- Polyoxometalate (POM)-aided modification of lignin from wheat straw biorefinery
- Salting-out and salting-in experiments with lignosulfonates (LSs)
- Determination of the diffusion of monovalent cations into wood under isothermal conditions based on LiCl impregnation of Norway spruce
- Modification of hemicelluloses with polycarboxylic acids
- Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
- Elaboration of multilayered thin films based on cellulose nanocrystals and cationic xylans: application to xylanase activity detection
- Characterization of the pore structure of nanoporous activated carbons produced from wood waste
- Sorption properties of hydrothermally modified wood and data evaluation based on the concept of Hansen solubility parameter (HSP)
- Meetings
- Meetings
Artikel in diesem Heft
- Masthead
- Masthead
- Original Articles
- Biorefinery in a pulp mill: simultaneous production of cellulosic fibers from Eucalyptus globulus by soda-anthraquinone cooking and surface-active agents
- Thermomechanical pulping of novel Brazilian Eucalyptus hybrids
- Contribution of xylan to the brightness development and stability in the final ECF bleaching of eucalypt (Eucalyptus globulus Labill.) kraft pulp
- Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls
- The role of Donnan effect in kraft cooking liquor impregnation and hot water extraction of wood
- Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
- Laser-induced fluorescence (LIF) of lignin and lignin model compounds in Raman spectroscopy
- Polyoxometalate (POM)-aided modification of lignin from wheat straw biorefinery
- Salting-out and salting-in experiments with lignosulfonates (LSs)
- Determination of the diffusion of monovalent cations into wood under isothermal conditions based on LiCl impregnation of Norway spruce
- Modification of hemicelluloses with polycarboxylic acids
- Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
- Elaboration of multilayered thin films based on cellulose nanocrystals and cationic xylans: application to xylanase activity detection
- Characterization of the pore structure of nanoporous activated carbons produced from wood waste
- Sorption properties of hydrothermally modified wood and data evaluation based on the concept of Hansen solubility parameter (HSP)
- Meetings
- Meetings