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首页> 外文期刊>Journal of Wood Chemistry and Technology >Developing Diffusion Coefficients for SCF Impregnation of Douglas Fir Heartwood with Cyproconazole
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Developing Diffusion Coefficients for SCF Impregnation of Douglas Fir Heartwood with Cyproconazole

机译：用环丙康唑开发花旗松心材SCF浸渍的扩散系数

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摘要

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.
机译：利用冷却诱导杀生物剂沉积，研究了道格拉斯杉心材的处理时间和试样长度对环丙康唑超临界流体浸渍的影响。测量了不同治疗时期和位置的保留水平。假定这些保留值等于治疗期结束时杀菌剂的浓度。然后将浓度值相对于距表面的距离拟合为时间和距离的函数的经验表达式。根据所得的浓度公式，使用Egner's解法对Fickian扩散方程在一个方向上确定杀菌剂在数据深度位置的时变有效扩散系数。扩散系数值表明，扩散可能是杀生物剂渗透的限速现象。延长处理时间似乎可以增加有效扩散系数，这可能是通过去除心材凹坑中的提取物来实现的。

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