The separation of propylene carbonate (PC) and γ-butyrolactone (GBL) from their primary impurities, which include water, propylene glycol (PG), and diethyl succinate (DES) and lower the potential of PC as a solvent in lithium batteries, was investigated. Consequently, the isobaric vapor−liquid equilibria (VLEs) for the PG + PC, GBL + DES, and water + GBL binary systems, as well as the solid−liquid equilibria (SLEs) for the GBL + DES and water + GBL binary systems, were characterized. The Wilson, nonrandom two-liquid (NRTL), and universal quasi-chemical (UNIQUAC) equations are used to describe the aforementioned VLEs and SLEs. Furthermore, we report the vapor pressures of PG, GBL, DES, and PC with a dynamic glass still from T = (376.99 to 485.91) K, as well as excess molar volume mixture properties (V E), deviations in the molar refraction (ΔR), and deviations in viscosity (Δη) at 298.15 K for the same compositions.