Thermophysical properties of methanol+some polyethylene glycol dimethyl ether by UNIFAC and DISQUAC group-contribution models for absorption heat pumps

Several group-contribution models including three different versions of UNIFAC, GC-UNIMOD and DISQUAC are tested for their capabilities of predicting vapour–liquid equilibria, excess enthalpies and viscosities of methanol+some polyethylene glycol dimethyl ethers over a wide range of temperature. Also, the literature experimental thermophysical property database of these serial systems are collected, and new experimental excess enthalpies of methanol+pentaethylene glycol dimethyl ether at 303.15 K and densities and kinematic viscosities of methanol with monoethylene glycol dimethyl ether, triethylene glycol dimethyl ether, or pentaethylene glycol ether at 303.15 K are reported as a supplement to this experimental database. The predictions for vapour–liquid equilibria and excess enthalpies from modified UNIFAC of Gmehling et al. are the best, yielding the average relative deviation around 3% for vapour pressure and 30% for excess enthalpy. GC-UNIMOD viscosity group-contribution model gives the average relative deviation around 20% for viscosity predictions of the studied systems