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7945277 
Journal Article 
THERMODYNAMICS OF LIQUID-MIXTURES CONTAINING HYDROCARBONS AND STRONGLY POLAR SUBSTANCES - V-E AND C-P(E) OF (PYRIDINE OR PIPERIDINE+CYCLOHEXANE) AT 298.15 K 
Lainez, A; Wilhelm, E; Grolier, JPE 
1994 
1 
Monatshefte für Chemie / Chemical Monthly
ISSN: 0026-9247
EISSN: 1434-4475 
125 
8-9 
877-885 
English 
WOS:A1994PE81600011 
Excess molar volumes VE and excess molar heat capacities CPE at constant pressure have been determined, as a function of mole fraction x1 at 298.15 K and atmospheric pressure, for the two liquid mixtures {pyridine or piperidine+cyclohexane}. The instruments used were a vibrating-tube densimeter and a Picker flow microcalorimeter, respectively. The two systems show positive excess volumes with VE(x1=0.5)=0.531 cm3·mol-1 for {pyridine+cyclohexane} and 0.295 cm3·mol-1 for {piperidine+cyclohexane}. The curve CPEvs. x1 for {pyridine+cyclohexane} shows a rather complex S-shape:CPE is negative at small mole fractions x1 of pyridine and positive for x1>0.22, roughly. CPE of the piperidine system is negative throughout and strongly asymmetric with the minimum CPE(x1,min)=-2.32J·K-1·mol-1 being situated at a mole fraction of piperidine x1,min≈0.27. 1994 Springer-Verlag. 
THERMODYNAMICS; EXCESS MOLAR VOLUME; EXCESS MOLAR HEAT CAPACITY; LIQUID MIXTURES; DENSITY; CALORIMETRY; PYRIDINE; PIPERIDINE; CYCLOHEXANE