Measurement of the diffusion coefficients of carbon dioxide and nitrous oxide in water and aqueous solutions of glycerol

Abstract

Diffusion coefficients are measured for physical absorption using a laminar jet apparatus. The COz+water system is examined over a wide temperature range. The systems NzO+water and N20+water glycerol are examined at constant temperature over a wide range of concentrations of glycerol solutions. A modified Stokes Einstein equation is proposed. Values of diffusion coefficients are obtained with an error of about 1 "/,.

On the molecular diffusion coefficients of dissolved , and and their dependence on isotopic mass

“…Note that the confidence interval given here reflects the statistics of the simulations, rather than biases due to systematic errors (for detailed discussion, see Section 8). The simulated values agree well with observations over the temperature range 0-75°C (Davidson and Cullen, 1957;Himmelblau, 1964;Thomas and Adams, 1965;Jähne et al, 1987;Tamimi et al, 1994). The two data points above 75°C (Tamimi et al, 1994) indicate higher values than the simulations.…”

Transport Mechanisms for CO2-CH4 Exchange and Safe CO2 Storage in Hydrate-Bearing Sandstone

“…A water film of varying thickness will therefore separate the mineral and hydrate surface, in which gases (CH4 and/or CO2) may be transported. The diffusion coefficient of CO2 and CH4 in water [29] are several orders of magnitude larger than diffusion through hydrate [30,31]. Mass transfer will therefore be more efficient in the water layer, which is important for the exchange mechanism [19], as limited mass transport through solid hydrate layers will impair the exchange performance.…”

Measurement of the Mass Transfer into Single Drops in the System of Water/Supercritical Carbon Dioxide

“…8 in an Arrhenius diagram; the activation energy was determined to be E A = 18.6 ± 5.4 kJ/mol. This rather small value for the activation energy, being within the range of the activation energy of conduction mass transfer (13,18), indicates a diffusioncontrolled resistance in the interfacial area.…”

“…Using the diffusion coefficients of CO 2 in water from (13) During drop formation, strong internal movements that are regular because of the laminar flow through the capillary take place. This leads to the above-mentioned fast initial carbon dioxide uptake by the drop.…”