DIMERIZATION OF ACRYLIC-ACID AND OF METHACRYLIC-ACID IN SUPERCRITICAL ETHYLENE

被引：21

作者：

BUBACK, M

MAHLING, FO

机构：

[1] Institut für Physikalische Chemie der Universität Göttingen, D-37077 Göttingen

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 1995年 / 8卷 / 02期

关键词：

CARBOXYLIC ACIDS; DIMERIZATION; HIGH PRESSURE; THERMODYNAMIC DATA; ETHYLENE;

D O I：

10.1016/0896-8446(95)90024-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dimerization of acrylic and of methacrylic acid in dilute solutions of supercritical ethylene was investigated via FTIR-spectroscopy in the region of the C=O stretching fundamentals. Concentrations of monomers and of hydrogen bonded dimers at temperatures up to 175 degrees C and pressures to 2500 bar were derived by deconvoluting the measured absorbance spectra with a band simulation program. For methacrylic acid, the carbonyl absorption spectra were decomposed into a monomer and a dimer component from which the pressure-dependent enthalpy of dimerization Delta H-0 = -(46.7 - 2.49 . p/kbar) kJ mol(-1) and the temperature-dependent dimerization volume Delta V-0 = (5.7 - 0.069 . T/degrees C) cm(3) mol(-1) were calculated. For acrylic acid additional absorption components occur as a consequence of s-cis-/s-trans-isomerism. The pressure-dependent enthalpy of dimerization is found to be: Delta H-0 = -(44.5 - 1.85 p/kbar) kJ mol(-1).

引用

页码：119 / 126

页数：8

共 27 条

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