The purpose of this research was to improve and apply to industrial conditions the 3-D computer simulation of the impregnation and pulping of wood developed using large handmade wood blocks by Morin (Ph.D. theses, McGill 1994). The simulation, written in Fortran 77, predicts the convection, diffusion, and reaction mechanisms in CMP and CTMP pulping processes. Chemicals concentration profiles inside the chips can be obtained at any point of time during impregnation and pulping.;The simulation was rendered practical and easy to use by reducing the required input parameters to known operating conditions. Correlations between sapwood and heartwood chips fundamental properties and operating conditions were developed and integrated into the program. Experiments with different combinations of pre-treatments were performed using a mixture of sapwood and heartwood black spruce chips of different thicknesses. The experimental results were used to modify and improve the computer model.;The program was shown to accurately predict the impregnation concentration profiles for all experiments.
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