1 research outputs found
Vapor–Liquid Equilibria, Excess Enthalpy, and Density of Aqueous γ‑Valerolactone Solutions.
Thermodynamic measurements
were made for the binary mixture of
water + γ-valerolactone (GVL) and for pure GVL to facilitate
the development of the technology of lignin removal from lignocellulosic
biomass (Fang, W.; Sixta, H. Advanced Biorefinery based
on the Fractionation of Biomass in γ - Valerolactone and Water. ChemSusChem 2015, 8, 73−76). The density
and vapor pressure of pure GVL as a function of temperature were measured
and correlated for a wide range of the temperatures and pressures.
Isothermal vapor–liquid equilibrium (VLE) data of the binary
mixture of water + GVL were measured at 350.2 K with a static total
pressure apparatus. Absence of an azeotrope was confirmed by circulation
still measurements with diluted GVL solutions. Excess molar enthalpy
(<i>h</i><sup>E</sup>) of the mixture for the whole range
of mole fractions including infinite dilution was measured using a
SETARAM C80 calorimeter equipped with a flow mixing cell at 322.6
and 303.2 K. The VLE and <i>h</i><sup>E</sup> data were
used for the optimization of UNIQUAC and NRTL activity coefficient
model parameters. The experimental results are compared herein with
those predicted by COSMO-RS and UNIFAC-Dortmund models. The water
+ GVL binary mixture shows positive deviation from Raoult’s
law