EXCESS VOLUMES OF MIXTURES OF ALKANOLS WITH AROMATIC-HYDROCARBONS

The excess volumes of twenty binary mixtures of four aromatic hydrocar bons (benzene, toluene, ethylbenzene, and p-xylene) and five linear al kanols (methanol, ethanol, 1-propanol, 1-butanol, and 1-pentanol) at 2 0-degrees-C are reported. The excess volume of systems with the same a lkanol increases with increasing size and number of substituents on th e benzene ring. For systems with the same aromatic hydrocarbon it incr eases with the length of the alkanols. The dependence of DELTAV/phi1 p hi2 Values on composition is noticeably asymmetric. Systems with benze ne as one of the component show larger DELTAV/phi1 phi2 values than ot her systems and systems with methanol show different compositional dep endence patterns.