Thermochemical Properties of Menthol and Terpineol
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Thermochemical Properties of Menthol and Terpineol Zdeněk Wagner1 · Magdalena Bendová1 · Jan Rotrekl1 · Nirmal Parmar1 · Stanislav Kočí2 · Pavel Vrbka3 Received: 31 January 2020 / Accepted: 14 July 2020 / Published online: 6 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The work continues the project of physicochemical characterization of terpenic substances that are present in plants and after emission to the atmosphere play an important role in the formation of cloud condensation nuclei. Two substances, which are solid at room temperature, were studied in this work, namely both enantiomers of menthol and (–)-α-terpineol. Temperatures and enthalpies of fusion were measured, isobaric heat capacities were measured in the temperature range 326.15–348.15 K and vapor pressures were measured in the temperature range 400–430 K. The experimental values were compared with predictions by COSMO-RS. Modern nonstatistical algorithms based on mathematical gnostics were used for data analysis. Keywords Menthol · Terpineol · Secondary organic aerosol · Mathematical gnostics · Advanced data analysis
* Zdeněk Wagner [email protected] Magdalena Bendová [email protected] Jan Rotrekl [email protected] Nirmal Parmar [email protected] Pavel Vrbka [email protected] 1
Department of Aerosols Chemistry and Physics, Institute of Chemical Process Fundamentals of the CAS, v. v. i, Rozvojová 135/1, 165 02 Prague 6, Czech Republic
2
Masaryk Secondary School of Chemistry, Křemencova 179/12, 116 28 Prague 1, Czech Republic
3
Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
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Vol.:(0123456789)
1268
Journal of Solution Chemistry (2020) 49:1267–1278
1 Introduction This work continues the project of physicochemical characterization of terpenic substances started in previous papers [19, 20]. Monoterpenes are hydrocarbons built of two isoprene units. These hydrocarbons are found in plants and are accompanied by their derivates such as alcohols, aldehydes, carboxylic acids as well as esters. These substances are emitted to the atmosphere where they undergo oxidation and ozonolysis to compounds responsible for formation of cloud condensation nuclei. Knowledge of the physicochemical properties is thus important for understanding the proces of nucleation in the atmosphere. The compounds studied in this work also find use in the food and perfume industries as well as in medicine. α-Terpineol is widely used as a standard natural surfactant. It is important to mention that this surfactant is commercially available as a liquid and used in laboratories as purchased. In fact, pure α-terpineol is solid at room temperature. α-Terpineol as a liquid surfactant is commercially available and its specification shows that, in fact, it is a mixture of terpineol isomers which can contain as little as 40% of α-terpineol. The isomers differ in melting points but boiling points are close to each other. Only the α-isomer is comm
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