Pressure–Volume–Temperature Relationships for Aqueous Solutions of N-Methylacetamide at Temperatures Ranging from 278.15 to 323.15 K and Pressures up to 100 MPa

Abstract

This paper deals with the densities of aqueous solutions of Nmethylacetamide (NMA) in the range of concentrations x (starting from 0.0095 to 0.699

Volumetric Properties of Binary Liquid Mixtures of Water with N-Methylpyrrolidone at (278.15–323.15) K and up to 70 MPa

“…The paper also compares the volumetric characteristics of aqueous mixtures of NMP and pyrrolidone, which we previously studied under the same state parameters . This work continues our early studies of the volumetric properties of aqueous solutions of amides with various types of intermolecular interactions depending on the composition, temperature, and pressure. − …”

“…The minimum value of V m E at 298.15 K and atmospheric pressure equal to −1.0 × 10 −6 m 3 mol −1 is more negative than V m E for the water−2-pyrrolidone mixture (−0.57 × 10 −6 m 3 mol −1 ). 27 This indicates that the -CH 3 substitution at the ring nitrogen atom leads to a significant weakening of the selfassociation of NMP in water. These values decrease in absolute value with increasing temperature and with increasing pressure.…”

“…The paper also compares the volumetric characteristics of aqueous mixtures of NMP and pyrrolidone, which we previously studied under the same state parameters. 27 1. N-Methylpyrrolidone (Sigma-Aldrich, mass fraction of ≥0.99 as stated by the supplier) was treated by boiling with calcium oxide and double distillation under a vacuum.…”

“…The details about the experimental setup and the operating method that was used in our laboratory have been described in previous work. 27 The calibration was performed by using water and toluene following the procedure described in a previous article. 27 The IAPWS-95 formulation 32 was used to calculate the density of water.…”

“…27 The calibration was performed by using water and toluene following the procedure described in a previous article. 27 The IAPWS-95 formulation 32 was used to calculate the density of water. Density data for toluene were taken from The Standard Reference Data Base from NIST obtained from the NIST Chemistry Web-Book 33 over the temperature and pressure ranges under consideration with a claimed average absolute deviation of 0.05% at pressure.…”