Thermodynamic study of the sublimation of eight 4-n-alkylbenzoic acids

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• 作者：Monte ; Manuel J.S. ; Almeida ; Ana R.R.P. ; Ribeiro da Silva ; Manuel A.V.
• 关键词：Knudsen effusion ; Vapour pressures ; Enthalpies of sublimation ; Entropies of sublimation ; Enthalpies of fusion ; Alkylbenzoic acids ; Liquid crystals
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2004
• 出版时间：May, 2004
• 年：2004
• 卷：36
• 期：5
• 页码：385-392
• 全文大小：206 K

文摘

The Knudsen mass-loss effusion technique was used to measure the vapour pressures at different temperatures of the following 4-n-alkylbenzoic acids: 4-methylbenzoic acid, between 319.68 K and 337.33 K, 4-ethylbenzoic acid, between 321.17 K and 335.25 K, 4-propylbenzoic acid, between 331.16 K and 347.16 K, 4-butylbenzoic acid, between 333.16 K and 349.15 K, 4-pentylbenzoic acid, between 341.16 K and 357.16 K, 4-hexylbenzoic acid, between 347.08 K and 363.14 K, 4-heptylbenzoic acid, between 353.16 K and 369.20 K and 4-octylbenzoic acid, between 356.67 K and 371.86 K. From the temperature dependence of the vapour pressure of the crystalline compounds, the standard, p