162
Tatranské Matliare, Slovak Republic, May 26 – 30, 2003
Excess molar volumes of (benzene + isopropylbenzene, or
1,3,5-trimethylbenzene, or 1,2,4-trimethylbenzene) at temperatures between
298.15 K and 328.15 K
Lenka Morávková, Jan Linek
Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic,
Rozvojová 135, 165 02 Praha 6-Suchdol; Tel. +420 2 -20390270, -20390290, -20390291,
Fax: +420 2 20920661, E-mail: linek@icpf.cas.cz, moravkova@icpf.cas.cz
Keywords: benzene; isopropylbenzene; 1,2,4-trimethylbenzene; 1,3,5-trimethylbenzene;
binary mixture; density; excess volume; temperature dependence
The densities of benzene + isopropylbenzene, benzene + 1,2,4-trimethylbenzene, and benzene
+ 1,3,5-trimethylbenzene were measured at temperatures (298.15, 308.15, 318.15, and
328.15) K by means of a vibrating-tube densimeter. The excess molar volumes VmE calculated
from the density data provide the temperature dependence of VmE in the temperature range of
298 K to 328 K. The VmE results were correlated using the fourth-order Redlich-Kister
equation, with the maximum likelihood principle being applied for the determination of the
adjustable parameters. It was found that the deviations from ideal behaviour in the systems
studied (all being positive) decrease with increasing temperature.
The authors would like to acknowledge the partial support from the Grant Agency of the
Czech Republic; the work has been carried out under grant No. 203/02/1098.