Heat pump power supply of fluid technology for obtaining dry CO2-extracts from plant materials

Production of high-quality microbiologically pure products is an important task for food industry enterprises. Given the high microbiological contamination of raw materials (mainly flour), for the production of bakery products, it is necessary to use complex technologies, as well as products with antibacterial or antibiotic properties to prevent microbiological spoilage. St. John's wort has such an antibacterial effect due to the high content of substances with bactericidal properties (tannins, phytoncides, flavonoids, essential oils) and antioxidants. Modern trends in the development of the theory of thermal processes have prepared the conditions for a scientific approach to the creation of industrial energy-saving and environmentally friendly fluid technologies for obtaining dry CO2-extracts from plant materials based on heat pump heating. The choice of working cycles of heat pumps, ozone-safe working fluids, rational schemes of involving heat pump equipment in the structure of technological sweat constitutes a significant volume of research in the field of alternative energy. For effective substitution in heat supply systems of non-renewable energy sources for heat of renewable and secondary energy resources, a heat pump technology for obtaining dry CO2-extracts from St. John's wort is proposed, which considers two related processes – fluid CO2-extraction and spray drying, for realization of temperature modes of which a cascade three-stage heat pump is used. Organoleptic and physicochemical indicators, as well as the chemical composition of the dry extract of St. John's wort, obtained according to the proposed technology, are determined, indicating high antibacterial properties.