Vapor-liquid equilibrium (VLE) for binary mixtures of 1-Propanol + Poly (Propylene Glycol) 400, 725 and 1025

The improved isopiestic method [1] was used to measure 1-propanol activity data for severalbinary mixtures of 1-propanol + poly (propylene glycol) 400 (PPG400)/ poly (propylene glycol)725 (PPG725)/ poly (propylene glycol) 1025 (PPG1025) at 298.15 K. To calculate the activity ofthe 1-propanol, CaCl2 was used as isopiestic standard [2]. The effect of polymer molar mass wasconsidered on the solvent activity and vapor pressure of the studied systems. The results indicatethat solvent activity decreases with the increasing of the polymer molar mass as follow;PPG1025 ˃ PPG725 ˃ PPG400. These data have been correlated with Flory- Huggins (FH) [3]activity models. The obtained χ12 parameter from the Flory- Huggins (FH) model supplies thestrong solute-solvent interactions between 1-propanol with PPG1025 rather than other polymers.The obtained values for standard deviations for the model represents that Flory- Huggins (FH)model have good agreement with the experimental data.

کلیدواژه ها:

Poly (propylene glycol) ، Isopiestic method ، 1-Propanol activity ، Vapor pressure