THERMAL CHARACTERISTICS AND DENSITY OF HEXANE PARAFFIN SOLUTION AS AN OBJECT OF CONVECTIVE CONCENTRATION AND OBTAINING FOOD PARAFFIN

For film structures that are used for the production of biodegradable packaging materials and are hydrophilic in nature, the influence of external factors, primarily moisture, will be reduced by their paraffinization, i.e. applying a thin layer of molten food paraffin to the surface of the film for subsequent protection ofpackaged food products from moisture and sunlight. In the production of moisture-repellent compositions, much attention is paid to the quality of the initial base for the production of food paraffin, where one of its important safety indicators is the absence of carcinogenic aromatic hydrocarbons in it. One of the main characteristics of the material under study, taking into account the set goal, are its density and thermophysical characteristics (TPC). The aim of the study was to identify the regularities in the variation of TPH and in the ranges of temperature and concentration of a hexane paraffin solution corresponding to convec-tive concentration during the production of food paraffin. The objects of study were a hexane-paraffn mixture and paraffin purified from carcinogenic aromatic hydrocarbons. The density was determined by the pycnometric method, and the TPC was determined by the method of their complex determination for bulk, liquid and pasty samples, based on the inertia of a thermal temperature sensor. As for the hexane solution, experimental studies have shown that the most rational conditions for its preparation are: the temperature of the solvent is 40 ° C, taking into account the melting point of the sample and the intensification of solvent evaporation; the ratio of technical paraffin and solvent 1:10, which is due to the almost complete solubility of paraffin. For the implementation of thermal calculation procedures in the design of apparatuses, TPH and a phexa-noparaffn composition were found analytically and experimentally within certain limits of varying the amount of solvent in it and T , which determine the method of convective concentration of the test material. The given data do not conflict with the known results of other researchers; they have been confirmed experimentally and, consequently, can be used in engineering practice.

hexane-paraffin mixture, water-repellent coating, paraffinization, food paraffin, carcinogenic aromatic hydrocarbons, convective concentration, thermophysical characteristics, density of the object of study

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