Air Cleaning from Organic Compounds Using a Nanofiltration Composite Membrane Based on Cellulose Acetate and a Commercial Membrane of OPMN-P Brand

Nanofiltration membranes were used to separate the vapor–air mixture containing organic compounds. The membrane was obtained on a filter paper substrate by pouring with a three-component polymer solution. The surface layers were deposited on the substrate by sequentially alternating the stages of membrane drying. The resulting membrane has hydrophilic properties, the porosity of the resulting membrane is 51%. The membrane thickness determined by SEM was 98 µm. The retention capacity of the membranes was studied by separating model mixtures of ethanol–air and gasoline–air. The membrane permeability of the MAC3 composite membrane during separation of the ethanol–air vapor-air mixture was 11.0 m³/m²h at a pressure of 0.5 MPa. The high retention capacity of the MAC3 composite membrane was established for xylenes, toluene, and heptane; for other compounds, the efficiency is no more than 90%. The average retention capacity of the resulting membrane was 87%. Comparative tests to establish gas separation parameters under similar conditions were carried out with a commercial membrane brand OPMN-P.