Volume expansion and vapour–liquid equilibrium of toluene and ethanol with carbon dioxide at high pressures for the selection of optimum operational condition in the GAS process

ABSTRACT

High-pressure equilibrium data (vapour–liquid equilibria) were measured for CO₂ + toluene and CO₂ + ethanol systems between 298.15K and 318.15K and pressures up to 7.8 MPa. Based on reported relative volume expansion of solvents, the optimum operational condition for production of fine particles in Gas Anti-Solvent process has been suggested. Moreover, thermodynamic modelling of phase equilibria has been done using Peng-Robinson and Soave-Redlich-Kwong (SRK) equations of state along with van der Waals and Huron Vidal (HV) mixing rules. The results showed that the SRK–HV combination has the best accuracy between studied models and is capable of simulating the binary systems investigated in current research.

KEYWORDS:

• Solubility
• carbon dioxide
• volume expansion
• equation of state
• high-pressure phase equilibria

Disclosure statement

No potential conflict of interest was reported by the authors.