Experimental Thermochemical Data of CWA Simulants: Triethyl Phosphate, Diethyl Methylphosphonate, Malathion and Methyl Salicylate

Publication date: Available online 31 December 2019Source: The Journal of Chemical ThermodynamicsAuthor(s): Greta Bikelytė, Martin A.C. Härtel, Thomas M. Klapötke, Burkhard Krumm, Audrius SadaunykasAbstractThis work focuses on the determination of important thermochemical properties of several chemical warfare agent (CWA) simulants: diethyl methylphosphonate (DEMP, CAS 683-08-9, 1), triethyl phosphate (TEP, CAS 78-40-0, 2), malathion (CAS 121-75-5, 3) and methyl salicylate (MS, 119-36-8, 4). Enthalpies of vaporization ΔlgHmo. (298.15 K) (1: 56.8±0.8 kJ mol-1; 2: 63.9±0.9 kJ mol-1; 3: 101.4±1.8 kJ mol-1; 4: 59.3±0.8 kJ mol-1) and vapor pressures psat (298.15 K) (1: 43.9 Pa; 2: 12.5 Pa; 3: 1.4 mPa; 4: 14.5 Pa) were determined by the transpiration method in the ambient temperature range. The results were compared with existing literature values and critically evaluated. Data of DEMP 1, TEP 2 and MS 4 show agreement with most literature vaes, while results of malathion 3 show a significant disagreement with the scarce available literature p-T data.

Source: The Journal of Chemical Thermodynamics - January 2, 2020 Category: Chemistry Source Type: research