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 (pb>sat b>) 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 pb>sat b> for repeat measurements at 323.15 K. When combined with a room-temperature Nb>2 b> flush of the apparatus, the addition of 0.2 mass % TBHQ limited the decomposition to insignificant levels and resulted in repeatable measurements of pb>sat b>. Simultaneous measurements on the control sample n-eicosane (Cb>20 b>Hb>42 b>) yielded values of pb>sat b> that were in excellent agreement with reference correlations.