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Developing Diffusion Coefficients for SCF Impregnation of Douglas Fir Heartwood with Cyproconazole
Kang, S. M.,Ra, J. -B.,Levien, K. L.,Morrell, J. J. Taylor & Francis Inc. 2006 Journal of wood chemistry and technology Vol.26 No.2
<P> The effects of the treating period and specimen length on supercritical fluid impregnation of cyproconazole were investigated for Douglas fir heartwood using cooling to induce biocide deposition. Retention levels at various treatment periods and locations were measured. These retention values were assumed to be equivalent to the concentration of biocide at the end of the treatment period. The concentration values versus distance from the surface were then fitted to an empirical expression as a function of time and distance. From the resultant concentration formulae, time-varying effective diffusion coefficients for the biocide at the depth locations of the data were determined using Egner's solution method for the Fickian diffusion equation in one direction. The diffusion coefficient values suggested that diffusion was probably the rate-limiting phenomena accounting for biocide penetration. Prolonged treatment appeared to increase the effective diffusion coefficients, probably by removing extractives in heartwood pits.</P>