A study of the mechanism for ultrafiltration isolation of sodium lignosulfonate from aqueous solutions with track membranes

Abstract

Ultrafiltration of aqueous sodium lignosulfonate solutions through track membranes with 30-nm pores has been studied. Membrane selectivity has been investigated as depending on concentrations of sodium lignosulfonate (10, 20, 50, and 100 mg/dm³) and NaCl electrolyte (10^–3, 10^–2, and 10^–1 M). Ultrafiltration of lignosulfonate solutions has been shown to be associated with the “charge-related” mechanism of membrane selective permeability. Membrane selectivity decreases with a rise in the concentrations of lignosulfonate and NaCl, as well as the degree of filtrate extraction.