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In this work, a high-pressure visual cell is used to measure bubble and dew pressures and temperatures of a five-component synthetic mixture in the presence of CO2. The synthetic mixture was gravimetrically prepared and contains octane, hexadecane, methylcyclohexane, cis-decalin, and methylbenzene (toluene). Seven quantities of CO2 were injected in the synthetic mixture, and for each amount of CO2 bubble and dew pressures were measured at temperatures ranging from (292.95 to 373.35) K. The corresponding pressures vary between (20 and 165) bar. A total of 61 experimental bubble and dew pressures are reported. The experimental data are compared with results obtained using the PPR78 model in which the temperature-dependent binary interaction parameters are predicted by a group contribution method. Results clearly indicate that the PPR78 model is a good predictive model because the average absolute deviation is about 5.5 bar between experimental and calculated pressures. Results are presented at constant composition in (P,T) diagrams. They are also presented at constant temperature in (P, x CO 2 ) diagrams by considering the CO2 and the synthetic mixture as a pseudobinary mixture.

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Experiments on the residence time distribution (RTD) and axial dispersion for the continuous ow of sand and broken rice, through a pilot scale rotary kiln equipped with lifters, are reported. Factors such as the rotational speed, the kiln slope, the materials ow rate and the exit dam height have been studied. Furthermore, two proles of lifters were used: straight lifters (SL) and rectangular lifters (RL). Thus, under varying conditions the RTDs were obtained by the typical stimulus response test using a tracer and the corresponding axial dispersion coecients were determined. The validity of the axial dispersion model was assessed in this study, and the model was found to match well with the experimental data. A large number of experiments was conducted, so that, a mathematical model could be developed to predict the axial dispersion coecient of the solid particles within the kiln. Comparisons with reported models are also discussed.The second part of this study will be concerned with the experimental kiln hold-up and the mean residence time (MRT) of solid particles.