Vapor-Phase Spectra and the Pressure-Temperature Dependence of Long-Chain Carboxylic Acids Studied by a CO Laser and the Photoacoustic Heat-Pipe Detector

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A resonant photoacoustic heat-pipe (PAHP) cell was constructed and used for spectral studies of four long-chain saturated fatty acids (C10:0 to C16:0) at CO laser wavelengths and temperatures above that of the ambient. Vapor-phase absorption spectra were recorded at temperatures of 383 K for capric acid C10H20O29 400 K for lauric acid C12H24O29 438 K for myristic acid C14H28O29 and 445.5 K for palmitic acid C16H32O29 respectively. In addition, the temperature dependence (298 to 393 K) of vapor pressure was determined for C10:0; measurable PA signals were obtained at a temperature only a few degrees above the melting point for this acid. The data observed for C10:0 could be linearly fitted from as low as 323 K, indicating the validity of the Clausius-Clapeyron equation for temperatures lower than the 398 K < T < 541.4 K range anticipated so far.

Keywords: CO laser; Clausius-Clapeyron equation; Heat pipe; High-temperature photoacoustic cell; Infrared spectrum; Saturated fatty acids; Vapor pressure

Document Type: Research Article


Affiliations: 1: DLO Centre for Plant Breeding and Reproduction Research, CPRO-DLO, P.O. Box 16, 6700 AA Wageningen, The Netherlands 2: Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Agricultural University, Bomenweg 4, 6703 HD Wageningen, The Netherlands 3: Department of Environmental Chemistry, Jozef Stefan Institute, Jamova 39, 61000 Ljubljana, Slovenia 4: Department of Quantum Electronics, JATE, University of Szeged, Dom Ter 9, H-6720 Szeged, Hungary

Publication date: July 1, 1995

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