DIFFUSION-COEFFICIENTS AND VISCOSITIES OF CO2-MIXTURES(H2O, CO2+CH3OH, NH3+H2O, AND NH3+CH3OH LIQUID)

To evaluate quantitatively the results of gas-liquid absorption experi ments, accurate liquid-phase diffusion coefficients and viscosities ar e needed. In this paper experimental values of these quantities will b e reported for the binary systems carbon dioxide + water, carbon dioxi de + methanol, ammonia + water, and ammonia + methanol. The diffusion coefficients have been measured using the Taylor-Aris dispersion metho d, and the viscosities have been measured with a falling ball viscomet er;at temperatures from 293 to 333 K. The ammonia mole fraction ranged from 0 to 0.312. The results have been correlated using Arrhenius-typ e equations and have been compared with literature data, where availab le. Furthermore, the measured diffusion coefficients are compared with values predicted by the modified Stokes-Einstein equation and the Wil ke-Chang equation.