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Flow Toolkit for Measuring Gas Diffusivity in Liquids

Author:
Zhang, Jisong, Teixeira, Andrew R., Zhang, Haomiao, Jensen, Klavs F.
Source:
Analytical chemistry 2019 v.91 no.6 pp. 4004-4009
ISSN:
1520-6882
Subject:
diffusivity, mass transfer, polytetrafluoroethylene
Abstract:
Precise knowledge of gas diffusivity in liquids is critical for describing complex multiphase reaction systems. Here we present a high-throughput flow concept to measure gas diffusivity in liquids. This strategy takes advantage of the tube-in-tube reactor design whereby semipermeable Teflon AF-2400 tubes facilitate fast mass transfer between gas and liquid without directly contacting the two fluids. Coupled pseudosteady-state flux balances over the gas and liquid describe the gas dissolution rate and corresponding diffusivity with the aid of a single gas flow meter and a continuously ramped liquid flow rate. This in situ method demonstrates excellent accuracy in diffusion coefficient measurements, with less than 5% deviation from established techniques.
Agid:
6331935