Thermodynamics of Mixtures Containing a Very Strongly Polar Compound. 10. Liquid鈥揕iquid Equilibria for N,N-Dimethylacetamide + Selected Alkanes

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• 作者：Cristina Alonso Trist谩n ; Juan Antonio Gonz谩lez ; Isa铆as Garc铆a De La Fuente ; Jos茅 Carlos Cobos
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：August 8, 2013
• 年：2013
• 卷：58
• 期：8
• 页码：2339-2344
• 全文大小：256K
• 年卷期：v.58,no.8(August 8, 2013)
• ISSN：1520-5134

文摘

Liquid鈥搇iquid equilibrium (LLE) temperatures versus composition for N,N-dimethylacetamide (DMA) + decane, + dodecane, + tetradecane, + 2,2,4-trimethylpentane, + methylcyclohexane, or + cyclooctane mixtures have been measured by means of the critical opalescence method using a laser scattering technique. All the systems show an upper critical solution temperature (UCST). In the case of n-alkane mixtures, UCST increases almost linearly with the chain length of the n-alkane. Moreover, these solutions show higher UCST values than those with isomeric cyclic alkanes. Branching leads to a strong decrease of UCST. The symmetry of the LLE curves depends on the size and shape of the alkane. DISQUAC correctly represents the coordinates of the critical points using interaction parameters available in the literature.