Properties of the n‐methyl‐2‐pyrrolidinone‐water system

Abstract

Densities, excess volumes and heats of mixing, heat capacities, refractive indices and viscosities of various N‐methyl‐2‐pyrrolidinone (NMP)‐water mixtures are reported. The excess volumes and heat of mixing are negative and show their greatest deviations from ideality at 0.3 ‐ 04 mole fraction NMP. The viscosity of the system passes through a maximum in the same region of solvent composition. These data indicate strong interaction between NMP and water and suggest the existence of transient polymeric species of the type — (NMP · 2H2O)n̄.

The excess molar volumes and enthalpies of (N-methyl-2-pyrrolidinone+ an alcohol) atT= 298.15 K and the application of the ERAS theory

“…Continuing our research into the thermodynamic excess functions of mixtures containing N -methyl-2-pyrrolidinone (NMP), (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) we present here excess molar volumes and excess molar enthalpies for (NMP + an alcohol). NMP is a heterocyclic, polar solvent used for the a Visiting Ph.D. student from the Faculty of Chemistry, Physical Chemistry Division, Warsaw University of Technology.…”

Excess volumes and excess enthalpies of N-methyl-2-pyrrolidone with branched alcohols

“…The branched alkanols are widely used as coupling and dispersing agents in the chemical, pharmaceutical and household industries and as carrier and extraction solvents for natural products. To investigate the study of polar NMP with water [11][12][13][14] or 1-alkanols [7,[15][16][17], or iso-alkanols [C 3 -C 5 ] [18] a series of measurements are in progress.…”

Isentropic compressibilities of (amide+water) mixtures: A comparative study

“…The interest in these solvents arises from a theoretical view as well as from the biological, pharmaceutical and other applications of pure solvents and their aqueous solutions. The volumetric properties of amide aqueous solutions have been extensively studied: formamide [1][2][3][4][5], N-methylformamide [5][6][7], N,N-dimethylformamide [3][4][5][7][8][9][10], N,N-dimethylacetamide [1][2][3][4][11][12][13][14], pyrrolidin-2-one [5,7,15,16], N-methyl-2-pyrrolidinone [5,7,[16][17][18]. The ultrasonic behavior of amides in water [4,9,16,19,20] or other solvent mixtures [21][22][23][24][25] has been also reported as well as their dielectric constants [15,26] and viscosity behavior [4,5,13,…”