Research of phase equilibria in water-salt systems containing whey components

Автор: Plotnikova S.E., Gorbunova E.M., Niftaliev S.I., Bocharova L.V., Luchko A.M.

Журнал: Вестник Воронежского государственного университета инженерных технологий @vestnik-vsuet

Рубрика: Химическая технология

Статья в выпуске: 4 (98) т.85, 2023 года.

Бесплатный доступ

Currently, it is environmentally friendly and promising to use whey to produce lactose, lactulose and other valuable products that are beneficial to human health. However, the serum contains a sufficiently large amount of mineral salts, which complicates the recycling processes. In the process of demineralization, nonofiltration, cation- and anion-exchange membranes, etc., are widely used, which are polluted by the salt crystals formed. The least soluble of the inorganic substances present in the serum are calcium salts, in this regard, the three-component system Ca(H2PO4)2 - CaCl2 - H2O is of interest. To study phase equilibria in the Ca(H2PO4)2 - CaCl2 - H2O system a diagram of the state at a temperature of 20 ° C is constructed. According to the points corresponding to the composition of the equilibrium liquid phases, a monovariant equilibrium line is constructed, under which there is a region of unsaturated solutions. By the method of Screinemakers, it was found that in an area with a calcium chloride content of less than 43%, calcium dihydrogen phosphate monohydrate crystallizes. For the area adjacent to the top of CaCl2, three salts crystallize together: Ca(H2PO4)2 + CaCl2 + CaCl2∙6H2O. On the triangle of compositions there are two areas of joint existence of the solution and crystals of L + Ca(H2PO4)∙2H2O + Ca(H2PO4)2 and L + Ca(H2PO4)2 + CaCl2∙6H2O. The composition of crystallizing solid phases has been confirmed by chemical analysis. Using the obtained data, it is possible to create conditions for the preliminary crystallization of the salts that make up the whey and their isolation from the solution, which will reduce the clogging of the pores of the membranes in the further process of serum demineralization.

Еще

Whey, demineralization, state diagram, lactose production, lactulose production

Короткий адрес: https://sciup.org/140304439

IDR: 140304439   |   DOI: 10.20914/2310-1202-2023-4-139-144

Статья научная