The Use of Antioxidants to Improve Vapor Pressure Measurements on Compounds with Oxidative Instability: Methyl Oleate with tert-Butylhydroquinone

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• 作者：Jason A. WidegrenCasey E. Beall ; Audrey E. Tolbert ; Tara M. Lovestead ; Thomas J. Bruno
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：62
• 期：1
• 页码：539-546
• 全文大小：339K
• ISSN：1520-5134

文摘

The vapor pressure (p_sat) of methyl oleate was measured with and without the addition of 0.2 mass % of the antioxidant stabilizer tert-butylhydroquinone (TBHQ). The measurements were made by the gas saturation method with a temperature range of 303.15–343.15 K. In the absence of TBHQ, oxidative decomposition severely compromised the measurements, as evidenced by dramatic decreases in the measured p_sat for repeat measurements at 323.15 K. When combined with a room-temperature N₂ flush of the apparatus, the addition of 0.2 mass % TBHQ limited the decomposition to insignificant levels and resulted in repeatable measurements of p_sat. Simultaneous measurements on the control sample n-eicosane (C₂₀H₄₂) yielded values of p_sat that were in excellent agreement with reference correlations.