Effect of temperature and pressure on a water-benzene mixture as studied by infrared spectroscopy

Citation
S. Furutaka et S. Ikawa, Effect of temperature and pressure on a water-benzene mixture as studied by infrared spectroscopy, FLU PH EQUI, 185(1-2), 2001, pp. 379-387
Citations number
18
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
FLUID PHASE EQUILIBRIA
ISSN journal
03783812 → ACNP
Volume
185
Issue
1-2
Year of publication
2001
Pages
379 - 387
Database
ISI
SICI code
0378-3812(20010730)185:1-2<379:EOTAPO>2.0.ZU;2-6
Abstract
A water-benzene mixture has been studied by infrared spectroscopy at temper atures and pressures in the 473-648 K and 100-350 bar ranges. The OH stretc hing band intensity has been obtained as a measure of water concentration i n the mixture. In the temperature range of 473-523 K, the intensity is almo st independent of pressure. On the contrary, at higher temperatures, the ab sorption intensities exhibit remarkable pressure dependence. Moreover, the intensities increase with increasing temperature towards a certain temperat ure and then steeply decrease at higher temperatures. It has been found tha t the turning points of the intensities are located on an extended line of the liquid-liquid-gas three-phase equilibrium curve of the water-benzene mi xture and near the critical curve between the two-phase and one-phase regio ns. This fact suggests that density of the mixture changes steeply across t hose lines. We have also observed coalescence of two bands, which are assig ned to hydrogen-bonded and hydrogen-bond-free OH, respectively, at the high er temperatures, and discussed rotational motion of a water molecule in a h ydrogen-bonded cluster. (C) 2001 Elsevier Science B.V. All rights reserved.