Preparation and Study of Membranes for the Microfiltration Process of Sterilization of Black Grape Wine Material

This paper discusses the use of new microfiltration polymer membranes obtained by the phase inversion wet method for the filtration of Saperavi, Kindzmarauli, Khvanchkara, and Mukuzani type wine materials. They were prepared by precipitation of different concentrations of polyethersulfone and polyamide compositions: PES10%/DMF, PES12%/DMF, PA10%/DMF/LiCl, PA12%/DMF/LiCl. It was determined that the obtained microfiltration membranes can be successfully used for the filtration and stabilization of Georgian black wines such as Saperavi, Kindzmarauli, Khvanchkara, and Mukuzani without changing the sensory properties of the wine. It was also found that among the four membranes obtained, red wines filtered on the N2 membrane, which is obtained from a PES12%/DMF polymer composition with a pore size of 0.45 μm and better morphology, have lower turbidity values.