Diffusivities of the ternary liquid mixture 2-propanol—water—glycerol and three-component mass transfer in liquids

摘要: Abstract The theoretical description of multicomponent diffusion in liquids is still at an early stage development. coefficients strongly depend on the composition mixture. In order to calculate accurate mass transfer coefficients, extensive measurements diffusivities over whole range concentrations are necessary. This article shows how generalized Maxwell—Stefan (GMS) equations can be applied ternary liquid mixtures. a first step, nonideal mixture 2-propanol—water—glycerol and binary systems 2-propanol—glycerol water—glycerol measured by using diaphragm cell method. As second different methods calculating liquid-side fluxes compared. Finally, results confirmed with help evaporation experiments. experiments show that GMS similar ones exception pair 2-propanol—water. mixture, this coefficient slightly decreases when alcohol concentration rises. however, it increasing glycerol which, according Stokes—Einstein relation, again leads higher viscosity. calculation “viscosity-corrected” experimental obtained from So-called “quasi-ideal” allow for rapid estimation real behavior affects Thee quasi-ideal take into account. Their definition follows ideal formulation equations. With gas mixtures liquids.