Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4907267 | The Journal of Chemical Thermodynamics | 2017 | 42 Pages |
Abstract
Densities and volumetric heat capacities for dilute solutions of N-methylpiperidine (N-MP, 0.2 mol·kgâ1) and N-methylpiperidinium chloride (N-MPH+Clâ, 0.1 mol·kgâ1) were measured relative to water at 0.1 MPa using a vibrating-tube densimeter, and at 0.4 MPa using a twin fixed-cell, power-compensation, differential temperature-scanning nano calorimeter, over the temperature ranges 283.15 K â¤Â T â¤Â 363.15 K and 283.15 K â¤Â T â¤Â 393.15 K, respectively. The resulting apparent molar volumes, VÏ, and heat capacities, Cp,Ï, were corrected for speciation effects using Young's rule and extrapolated to infinite dilution using the Debye-Hückel limiting law, Yo â YÏ â AYIs1/2, to yield the standard partial molar properties, Yo, for N-MP(aq) and N-MPH+Clâ(aq). The standard partial molar volumes, Vo, and heat capacities, Cpo, were represented by a semi-empirical function of solvent density and temperature, Yo(Ïw,T), the “density” model, which can be used to extrapolate these results, as well as other thermodynamic properties for the ionization of N-methylpiperidine, to higher temperatures.
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Authors
C. McGregor, O. Fandiño, J.S. Cox, K. Ballerat-Busserolles, P.R. Tremaine,