ABSTRACT

In this work, a new series of low viscous protic ionic liquids based on N-methylpyrrolidone cation and carboxylate anions with different chain length has been synthesized and characterized. Density, speed of sound and viscosity have been measured for these ionic liquids in the temperature range from 293.15 to 343.15 K. The density data have been fitted to linear equation as well as correlated with group contribution method developed by Gardas and Coutinho. From the density correlation, molecular volume data for cation and anion constituents of studied ionic liquids have been proposed. By using experimental density and speed of sound data, the isentropic compressibility, coefficient of thermal expansion, standard entropy, intermolecular free length and lattice energy have been calculated for studied ionic liquids. Viscosity data were correlated with the Vogel Tammann Fulcher equation. To understand the nature of the ionic liquids and structure property relationship, the effect of anion alkyl chain length has been studied and correlated. Ionic liquids studied in this work are comparatively cheaper in price and can be promising in bio-macromolecule solubilization and other commercial fields.

Compounds

#	Formula	Name
1	C6H11NO3	N-methyl-2-oxopyrrolidinium formate
2	C7H13NO3	N-methyl-2-oxopyrrolidinium acetate
3	C8H15NO3	N-methyl-2-oxopyrrolidinium propionate
4	C9H17NO3	N-methyl-2-oxopyrrolidinium butanoate
5	C10H19NO3	N-methyl-2-oxopyrrolidinium pentanoate
6	C11H21NO3	N-methyl-2-oxopyrrolidinium hexanoate

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	4	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	4	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	6	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Measurement and correlation for the thermophysical properties of novel pyrrolidonium ionic liquids: Effect of temperature and alkyl chain length on anion

Panda, S.[Somenath], Gardas, R. L.[Ramesh L.]

ABSTRACT