Vapor Pressure and Thermodynamics of L-Tryptophan Sublimation
В. Б. Моталов, Mikhail A. Korobov, A.M. Dunaev, Valeriya V. Dunaeva, Л. С. Кудин
Abstract
The L-tryptophan sublimation was studied by high-temperature mass spectrometry in the temperature range 395–493 K. The compound evaporates congruently in the form of monomeric molecules. The saturated vapor pressure at 485 K was determined by the Knudsen effusion method. In combination with mass spectrometric data, the pressure equation ln (p, Pa) = –(19943±304)/T + (40.568±0.688) is recommended for the temperature range 395–493 K. The enthalpy of 167.5±1.6 kJ/mol for sublimation at 298.15 K was determined on the basis of the second and third laws of thermodynamics.
Topics & Concepts
ChemistrySublimation (psychology)Knudsen numberVapor pressureEnthalpy of sublimationThermodynamicsAtmospheric temperature rangeEnthalpyMass spectrometryPhysical chemistryAnalytical Chemistry (journal)Organic chemistryChromatographyPsychotherapistPhysicsPsychologyChemical Thermodynamics and Molecular StructurePhase Equilibria and ThermodynamicsAnalytical Chemistry and Chromatography