Kinetics of technical paraffin dissolution in hexane and the specific heat of vaporization of a hexane-paraffin composition in the production of food paraffin
Annotation
The article is devoted to the study of the kinetic regularities for the processes of technical paraffin dissolution in n-hexane and the convective concentration of the resulting solution. The results of the study are necessary to analyze the mechanism and speed of the processes depending on the regime parameters, allowing to determine the rational duration of the procedures carried out in the development of hydrophobic food packaging. The purpose of this study is to find the main factors of the kinetics for the procedure of dissolving technical paraffin in n-hexane (the process intensity constants nand k; the activation energy Eа (kJ/(mol °K))), as well as the specific heat of evaporation of the hexanoparaffin mixture r (kJ/kg) in the process of convective concentration. The objects of study were technical paraffin and hexanoparaffin mixture. The kinetics of technical paraffin dissolution of, according to a known method at the temperatures of 35°C and 40°C. The method is based on measuring the weight when mixed with a solvent, hanging a perforated metal container with a sample on the hook of a weighing mechanism, permanently measuring the weight of a sample of a container with a sample, lowering it into a container with a solvent under study, its thermostating, and recording data. Information about r at fixed values of its temperature was obtained experimentally on an experimental calorimetric setup. As a result of the studies carried out for the process of paraffin dissolution in n-hexane, the following values of the target parameters were obtained: Eа = 105.8 kJ/(mol °K); at 40°C n = 0.686, k = 0.031; at 35°C n = 1.042, k = 0.016. For the process of convective concentration, the value of the heat of evaporation of the solvent with toxic components dissolved in it was also determined: r = 420.9 kJ/kg.
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