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Opportunity at National Institute of Standards and Technology (NIST)

Supercritical Fluid Thermodynamics-Yang-Yang Critical Anomaly

Location

Material Measurement Laboratory, Applied Chemicals and Materials Division

RO# Location
50.64.72.C0424 Boulder, CO

Please note: This Agency only participates in the February and August reviews.

Advisers

Name E-mail Phone
Magee, Joe Wilton joe.magee@nist.gov 303.497.3298

Description

Supercritical fluid reactors and supercritical fluid separators are used in chemical manufacturing when they can potentially provide an efficient use of energy and materials. To achieve an optimum performance level, process models are used, which call for a detailed knowledge of supercritical fluid thermodynamics.[1] A major challenge is that, in the supercritical fluid region, the fluid is in the vicinity of a critical point, where thermodynamic properties undergo changes leading to an anomaly. From a theoretical perspective, we understand this behavior of the anomaly as the temperature and pressure where the correlation length extends to infinity and isochoric heat capacity grows to infinity. A series of calorimetric experiments on 2-propanol [2] and 17 other substances has established the conformity of the Yang-Yang critical anomaly as a thermodynamic model for supercritical fluids. Presently we seek to generalize the Yang-Yang model and an equation of state for supercritical fluids.

[1] Abdulagatov I. M., Magee, J. W., Polikhronidi, N. G. and Batyrova, R. G. "Yang-Yang Critical Anomaly" Ch. 15 in Enthalpy and Internal Energy: Liquids, Solutions and Vapours, Trevor Letcher and Emmerich Wilhelm, Editors, Cambridge: Royal Society of Chemistry, September 12, 2017, pp. 380-410 [DOI: 10.1039/9781788010214].

[2] Polikhronidi, N. G., Batyrova, R. G., Magee, J. W. and Abdulagatov I. M., "One- and Two-Phase Isochoric Heat Capacities and Saturated Densities of 2-Propanol in the Critical and Supercritical Regions," J. Chem. Thermodyn. 135: 155-174 (2019) [DOI: 10.1016/j.jct.2019.03.023].

Keywords:
supercritical fluid; thermodynamics; critical point; anomaly; heat capacity

Eligibility

Citizenship:  Open to U.S. citizens
Level:  Open to Postdoctoral applicants

Stipend

Base Stipend Travel Allotment Supplementation
$72,030.00 $3,000.00
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