Analytical Chemistry
Analytical Chemistry
5 years ago

Automated in Situ Measurement of Gas Solubility in Liquids with a Simple Tube-in-Tube Reactor

Automated in Situ Measurement of Gas Solubility in Liquids with a Simple Tube-in-Tube Reactor
Klavs F. Jensen, Jisong Zhang, Andrew R. Teixeira, Haomiao Zhang
Data on the solubilities of gases in liquids are foundational for assessing a variety of multiphase separations and gas–liquid reactions. Taking advantage of the tube-in-tube reactor design built with semipermeable Teflon AF-2400 tubes, liquids can be rapidly saturated without direct contacting of gas and liquid. The gas solubility can be determined by performing steady-state flux balances of both the gas and liquid flowing into the reactor system. Using this type of reactor, a fully automated strategy has been developed for the rapid in situ measurement of gas solubilities in liquids. The developed strategy enables precise gas solubility measurements within 2–5 min compared with 4–5 h using conventional methods. This technique can be extended to the discrete multipoint steady-state and continuous ramped-multipoint data acquisition methods. The accuracy of this method has been validated against several gas–liquid systems, showing less than 2% deviation from known values. Finally, this strategy has been extended to measure the temperature dependence of gas solubilities in situ and to estimate the local enthalpy of dissolution across a defined temperature range.

Publisher URL: http://dx.doi.org/10.1021/acs.analchem.7b02264

DOI: 10.1021/acs.analchem.7b02264

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