TRANSPORT OF DICARBOXYLIC-ACIDS ACROSS ION-EXCHANGE MEMBRANES

Regularities governing mass transfer of three members of the homologou s series of dicarboxylic acids, namely, oxalic, malonic, and succinic acids under the action of concentration gradients and electrical poten tial are studied. The integral coefficient of diffusive permeability o f oxalic acid across anionite membranes diminishes with growing soluti on concentration. This coefficient for cationite membranes is much sma ller than that for anionite membranes. The permeability of anionite me mbranes is found to decrease linearly as molar mass increases and the acidity constant of dicarboxylic acids by the first stage decreases. M ass transport across ionite membranes is studied during electrodialysi s of solutions of oxalic acid as a function of its concentration and t he charge passed. Electroosmotic transport of the solvent across ion-e xchange membranes is shown to rise with increasing molar mass and decr easing mobility of anions of dicarboxylic acids in the membrane. Coeff icients of electroosmotic permeability of solution in the process of e lectrodialytic transport of the acids are calculated.