The kinetics of water vapour sorption: analysis using parallel exponential kinetics model on six Malaysian hardwoods

W. S. Hashim, . and Hill C. A. S., . and H. Hamdan, . and J. Zaihan, . and Curling S., . The kinetics of water vapour sorption: analysis using parallel exponential kinetics model on six Malaysian hardwoods. pp. 107-117. ISSN 0128-1283

Six Malaysian hardwoods chengal (Neobalanocarpus heimii) kapur (Dryobalanops spp.) keruing (Dipterocarpus spp.) ramin(Gonystylus spp.) acacia (Acacia mangium) and sesendok (Endospermum malaccense) were studied to determine their sorption kinetics behaviour using a dynamic vapour sorption (DVS) apparatus. Experimental data fitted well to the parallel exponential kinetics (PEK) model. The PEK model expresses the sorption kinetics as fast and slow sorption processes but interpretation of how these can be related to physical phenomena is not yet understood. The Hailwood“Horrobin model was also used to examine the relationship between sorbed monolayer water and polylayer water at different relative humidities. Comparison between the two models was used to verify if the fast and slow sorption processes could be linked to monolayer or polylayer water formation in the cell wall. Characteristic times at various relative humidities showed differences between adsorption and desorption in the slow process for all the species. However using mass change criterion sorption hysteresis was found to occur in both the slow and fast processes.

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Abstract

Six Malaysian hardwoods chengal (Neobalanocarpus heimii) kapur (Dryobalanops spp.) keruing (Dipterocarpus spp.) ramin(Gonystylus spp.) acacia (Acacia mangium) and sesendok (Endospermum malaccense) were studied to determine their sorption kinetics behaviour using a dynamic vapour sorption (DVS) apparatus. Experimental data fitted well to the parallel exponential kinetics (PEK) model. The PEK model expresses the sorption kinetics as fast and slow sorption processes but interpretation of how these can be related to physical phenomena is not yet understood. The Hailwood“Horrobin model was also used to examine the relationship between sorbed monolayer water and polylayer water at different relative humidities. Comparison between the two models was used to verify if the fast and slow sorption processes could be linked to monolayer or polylayer water formation in the cell wall. Characteristic times at various relative humidities showed differences between adsorption and desorption in the slow process for all the species. However using mass change criterion sorption hysteresis was found to occur in both the slow and fast processes.

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Item Type:	Article
AGROVOC Term:	Hardwood
AGROVOC Term:	Dipterocarpaceae
AGROVOC Term:	Dryobalanops
AGROVOC Term:	Dipterocarpus
AGROVOC Term:	Gonystylus
AGROVOC Term:	Acacia mangium
AGROVOC Term:	Euphorbiaceae
AGROVOC Term:	Relative humidity
AGROVOC Term:	Moisture content
AGROVOC Term:	Adsorption
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 14:36
URI:	http://webagris.upm.edu.my/id/eprint/21493

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