Physical Properties of AqueousN-Methyl Pyrrolidone at Different Temperatures

Abstract

Many physical properties of aqueous N-Methyl pyrrolidone mixtures were determined for molar fraction X NMP ¼ 0.02, 0.05, 0.125, 0.32, 0.37 at different temperatures ranging from 15-65 C. From the result we noticed that the viscosity coefficient was increased with increasing the molar fraction X NMP and reached a maximum value at X NMP ¼ 0.25-0.37, and decreased with temperature. We observed the same relationship of the thermodynamic properties for the mixture at different temperatures and for excess activation function was positive. They reached maximum value at the X NMP ¼ 0.25-0.37. The same relationship was observed for excess dielectric constant. The results were explained according to hydrogen bonding effects and dipole-dipole interactions. This binding is stronger than binding between water molecules which may be let to form a complex at the ORDER REPRINTS molal fraction ratio 2:1 of water-NMP solution. We noticed that an increase in temperature may be let to tighten the interaction between water and NMP.

Investigation of the Effect of Temperature on the Physicochemical Properties of NMP-PA Ionic Liquid

“…In addition, the calculated density (ρ IL ) values of the synthesized IL at each temperature according to eq (density calculated based on pure component densities) and the extended Ye and Shreeve eq are given in Table . ρ normalI normalL = ω normalN normalM normalP × ρ normalN normalM normalP + ω normalP normalA × ρ normalP normalA ω NMP , ω PA , ρ NMP , and ρ PA are the mass fraction of pure NMP, mass fraction of pure PA, density of pure NMP, and density of pure PA, respectively. Density of pure NMP and PA at different temperatures was taken from the studies carried out by Maloka and Ibrahim and Egan and Luff, respectively. ρ normalI normalL = M W / [ N normalA V normalm false( a + b T + c P false) ] T and P are the temperature (in K) and pressure (in MPa), respectively. Table shows the fitting parameters of eq and the coefficients a , b , and c obtained by fitting the experimental data , to eq .…”

“…ω NMP , ω PA , ρ NMP , and ρ PA are the mass fraction of pure NMP, mass fraction of pure PA, density of pure NMP, and density of pure PA, respectively. Density of pure NMP and PA at different temperatures was taken from the studies carried out by Maloka and Ibrahim 70 and Egan and Luff, 71 respectively. (5)…”

Phase Behavior of N-Methylpyrrolidone + MCl (M = Na, K, Rb, Cs) + H2O Systems at 288.2, 298.2, and 308.2 K

“…In our previous works, the phase equilibria (LLE and SLE) of the ternary systems containing alkali metal salts, especially Rb and Cs, such as NaCl/KCl/RbCl/CsCl + amide + water − and RbBr/CsBr + FA/NMF/DMF + H 2 O were discussed. N -Methylpyrrolidone (NMP) is an important organic solvent both in a laboratory and in the industry. − NMP is a water-miscible strongly polar (μ = 4.09 D) aprotic solvent with a high boiling point (202 °C, 100 kPa). Herein, in this work, the phase behavior of NMP + NaCl/KCl/RbCl/CsCl + H 2 O ternary systems at 288.2, 298.2, and 308.2 K are presented.…”