Vapor-liquid equilibrium measurements on the N,N-dimethylformamide/1-butanol system at 65 and 125.degree.C

Abstract

Vapor-liquid equilibrium measurements have been performed by the total-pressure method on the , -dlmethylformamlde (DMF)/1-butanol system at 65 and 125 °C. The data were reduced to equilibrium phase compositions by using the Wilson activity coefficient equation to model the liquid phase and the Soave equation of state to model the vapor phase.

Three Binary Azeotropic Systems for 1-(Methoxymethoxy)-propane, 1-(Ethoxymethoxy)-propane, and Methoxy(methoxymethoxy)methane with Three Alcohols at 101.33 kPa: Experimental Data, Correlation, and Purification

“…The calculation method of the uncertainty is similar to the methods which are described in a previous reference. − The expanded uncertainty ( U ) of experimental data for chromatographic analysis includes five aforementioned elements which can be described by eq . where in this equation, u r(sample) means for the relative standard uncertainty of sediment sample mass determination, u r(true) represents the relative standard uncertainty of recovery determination, u r(cal) stands the relative standard uncertainty of calibration step, u r(rep) stands the relative standard uncertainty of repeatability, u r(LOD) stands the relative standard uncertainty of LOD determination. These relative standard uncertainties can be calculated by eqs , , , and : RSD is the relative standard deviation calculated by using the following eq : The expanded uncertainty of the VLE measurement of three binary systems, MMP + ethanol, EMP + 1-butanol, and DMM2 + 1-propanol, were calculated by these equations, using a coverage factor of 2 (for P = 95%).…”

“…As additional purity checks, we tested the normal boiling points, densities (ρ), and refractive indices ( n D ) of six pure chemicals and compared these measurements with the literature values − presented in Table . The methods of measurement and calculation for three physical property parameters have been described in our previous paper …”

Isobaric Vapor–Liquid Phase Equilibrium Measurements, Correlation, and Prediction for Separation of the Mixtures of Cyclohexanone and Alcohols

“…The boiling temperatures of the chemicals were determined by a mercury thermometer with the uncertainty of 0.1 K at 101.3 kPa. The density (ρ), index of refraction ( n D ) at T = 298.15 K, and boiling temperature ( T b ) for all chemicals were determined at 101.3 kPa and compared with the reference values. − The measured values are given in Table .…”

Isothermal and isobaric (vapour + liquid) equilibria of (N,N- dimethylformamide + 2-propanol+ 1-butanol)

“…data are predicted from the binary results. (8) 2-Propanol 0.78126 0.78123 (9) 1.3748 1.3749 (10) 355.59 355.65 (10) 1-Butanol 0.80594 0.80589 (11) 1.3971 1.3970 (11) 390.40 390.53 (12) …”