ABSTRACT

Densities and volumetric heat capacities for dilute solutions of N-methylpiperidine (N-MP, 0.2 mol kg 1) and N-methylpiperidinium chloride (N-MPH+Cl , 0.1 mol kg 1) were measured relative to water at 0.1 MPa using a vibrating-tube densimeter, and at 0.4 MPa using a twin fixed-cell, powercompensation, differential temperature-scanning nano calorimeter, over the temperature ranges 283.15 K T 363.15 K and 283.15 K T 393.15 K, respectively. The resulting apparent molar volumes, V/, and heat capacities, Cp,/, were corrected for speciation effects using Young s rule and extrapolated to infinite dilution using the Debye-Huckel limiting law, Yo Y/ AYIs 1/2, to yield the standard partial molar properties, Yo, for N-MP(aq) and N-MPH+Cl (aq). The standard partial molar volumes, Vo, and heat capacities, Cp o, were represented by a semi-empirical function of solvent density and temperature, Yo(qw,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.

Compounds

#	Formula	Name
1	C6H13N	N-methylpiperidine
2	H2O	water
3	C6H14ClN	N-methylpiperidinium chloride

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 2	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	33
POMD	1 2	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Molality, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	66
POMD	2 3	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	31
POMD	2 3	Heat capacity at constant pressure per volume, J/K/m3 ; Liquid	Molality, mol/kg - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	64

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Standard partial molar heat capacities and volumes of aqueous N-methylpiperidine and N-methylpiperidinium chloride from 283 K to 393 K

McGregor, C., Fandino, O., Cox, J. S., Ballerat-Busserolles, K., Tremaine, P. R.

ABSTRACT