Vapor−Liquid−Liquid Equilibrium (VLLE) and Vapor Pressure Data for the Systems 2-Methyl-1,3-dioxolane (2MD) + Water and 2,4-Dimethyl-1,3-dioxolane (24DMD) + Water

Abstract

Vapor−liquid−liquid equilibrium data for the binary systems 2-methyl-1,3-dioxolane + water and 2,4-dimethyl-1,3-dioxolane + water were collected by using a modified Othmer still vessel at 1 atm of pressure. The UNIQUAC equation of state was fitted to the experimental T−x−x−y data to generate the coefficients of the binary interaction parameters for each system. Vapor pressures for pure 2,4-dimethyl-1,3-dioxolane and 2-methyl-1,3-dioxolane were also measured and used to calculate the constants in Antoine's equation and pure component parameters for each dioxolane. The enthalpy of vaporization calculated from vapor pressure data via the Clausius−Clapeyron equation was in good agreement with the literature value.

Liquid–liquid equilibria for multicomponent mixtures of 2,2-dimethyl-1,3-dioxolane with n-heptane, toluene, ethanol and water

“…The extension of the gap at a fixed temperature distinctly depends on the nature of the substituent and on its position in dioxolane molecules. According to the data presented in [24,25] the extension of heterogeneous regions in aqueous solutions of alkyl-substituted dioxolanes grows in the sequence 2-methyl-1,3-dioxolane < 4-methyl-1,3-dioxolane < 2,2-dimethyl-1,3-dioxolane < 2-ethyl-1,3-dioxolane.…”

“…The VLE data correlation using the NRTL model was performed for binary mixtures of 4-methyl-1,3-dioxolane with methanol, propylene glycol and acetone [27]. The ability to correlate VLLE data for binary mixtures of water with 2-methyl-1,3-dioxolane or with 2,4-dimethyl-1,3-dioxolane applying the UNIQUAC model was studied in [25]. The calculations using the UNIFAC model were performed to describe the mutual solubility of the components in binary and multicomponent mixtures of 2,2-dimethyl-1,3-dioxolane-4-methanol with n-heptane, ethanol and water [26].…”

Biomass-derived Platform Molecules Upgrading through Catalytic Processes: Yielding Chemicals and Fuels

“…For instance, PG produces 2,4-dimethyl-1,3-dioxolane (24DMD), after reacting with acetaldehyde, with boiling points at atmospheric pressure of 470 K and 355 K, respectively. Once the equilibrium data of the system is known 182) , different scenarios of separation can be imagined depending on the composition of the mixture of glycols 183) . Then, energy savings per kg of purified glycol can be easily calculated using process simulations software.…”

Selective removal of 1,2‐propanediol and 1,2‐butanediol from bio‐ethylene glycol by catalytic reaction

“…Dhale et al converted PDO and EG with acetaldehyde to form 2,4-dimethyl-1,3-dioxolane (DMD) and 2-methyl-1,3-dioxolane (MD), respectively, which can be separated through regular distillation at lower temperatures. 20,21 Unfortunately, the boiling point difference between DMD-water and MDwater (azeotropes) is only 4 K, so that the number of theoretical trays required for the distillation column is still high. In addition, a large amount of flammable and hazardous acetaldehyde is required, which greatly increases the cost and operation risks.…”