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8374594 
Journal Article 
P-T-x diagrams in the critical region. Acetone-n-alkane systems 
Kay, WB 
1964 
1 
Journal of Physical Chemistry
ISSN: 0022-3654 
68 
4 
827-831 
English 
The P-T-x phase diagrams of nine binary systems composed of the n-alkanes from ethane through n-octane plus n-decane and tridecane, with acetone as a common component, were determined in the critical region. Critical positive azeotropes were found to exist in the n-pentane-acetone and n-hexane-acetone systems and possibly in the n-heptane-acetone system. In general, systems which form positive critical azeotropes possess a minimum temperature point in the critical locus curve. Exceptions to this rule are discussed. The results suggest a general pattern of phase behavior of binary systems composed of the members of a homologous series of compounds and a common azeotrope-forming compound that may be used for a qualitative prediction of their critical locus.