- Environmental Science; Chemical Engineering; Alkali treatment; Diffusion; Incorporation; Liquid transport; Swelling; Wood
The kinetics of unidirectional penetration of NaOH aqueous solution into rectangular samples of wood oriented parallel to a stern axis were studied. Scots pine (Pinus sylvestris), European larch (Larix decidua), blackthorn (Prunus spinosa), white willow (Salix alba), and horsechestnut wood (Aesculus hippocastanum) were studied in this work. The time dependence of liquid incorporation was measured by the volumetric method as a change of total volume of coexisting liquid (NaOH/HO) phase. The total thickness of the swollen surface layer d and mean value of the apparent diffusion coefficient D̄ of aqueous NaOH solution at 22 °C were determined.