Isobaric Vapor–Liquid Equilibrium of Furfural + γ-Valerolactone at 30 kPa and Isothermal Liquid–Liquid Equilibrium of Carbon Dioxide + γ-Valerolactone + Water at 298 K

Abstract

The phase equilibria of four subsystems related to the γ-valerolactone (GVL) based biorefinery concept were measured. The liquid−liquid equilibrium (LLE) is important in separating GVL from aqueous solution with the aid of carbon dioxide. LLE of dense carbon dioxide, GVL, and water at 7.5 MPa was measured in a high pressure equilibrium cell equipped with a pneumatic capillary sampler. The solubility of GLV was from 2 to 10 times higher in the dense CO 2 phase than in the aqueous phase indicating CO 2 is a good solvent for this separation. The vapor−liquid equilibrium of furfural and GVL is important in the separation of traces of furfural from GVL in solvent recycling. It was found that furfural and GVL is a very ideal binary system at subatmospheric pressure. The predictive SRK (PSRK) equation of state and UNIQUAC activity coefficient model were used to model the binary and ternary systems measured in this work.

Isobaric Vapor–Liquid Equilibria of Binary Mixtures of γ-Valerolactone + Acetone and Ethyl Acetate

“…It was earlier shown that GVL does not form a measurable amount of peroxide under air and does not make an azeotropic mixture with water, C 1 –C 3 alcohols and formic acid . Its temperature-dependent vapor pressure as a key property even in the case of solvent utilization was recently measured by several groups. ,− Pokki and co-workers determined the isobaric vapor–liquid equilibrium (VLE) data of the GVL–furfural system and investigated the GVL–water binary mixture including its isothermal VLE data, the excess enthalpy, and density of aqueous GVL solutions . Růžička measured the enthalpy of vaporization and fusion as well as condensed phase heat capacity of GVL .…”

Chemical Recovery of γ-Valerolactone/Water Biorefinery

“…The rate of GVL removal from the spent liquor decreased as the extraction proceeded, because the partition coefficient approached unity at low GVL concentration. 27 Moreover, the lack of a mixing mechanism in our system severely limited the mass transfer of GVL to the CO 2 phase. Both phenomena resulted in a high leftover GVL rate (∼10%) in the raffinate, even at excessive CO 2 dosage.…”

“… 25 , 26 Our parallel study on the thermodynamics and phase behaviors of the GVL–CO 2 –water ternary system confirmed the affinity of GVL toward the CO 2 phase over the aqueous phase at room temperature and high pressure. 27 These two separation methods served as the core techniques of our recovery schemes.…”

Evaluation of experimental and predicted vapor-liquid equilibrium data for systems relevant to biomass fast pyrolysis and catalytic upgrading

“…This publication is available free of charge from: https://doi.org/10.6028/NIST.IR.8357 Triangles are for 2-furaldehyde + furfuryl alcohol: , Myles and Wingard [46]; , Tsirlin and Vasil'eva [47]. Diamonds () are for 2-furaldehyde + γ-valerolactone, Pokki et al [48]. Squares () are for 2-furaldehyde + 2-acetylfuran, Zheng et al [49].…”