Vapor Pressures of 2,4,6-Trimethyl-1,3,5-triazine (TMTZ) and 2,4,6-Trimethoxy-1,3,5-triazine (TMoxTZ)
Abstract
The vapor pressure of 2,4,6-trimethyl-1,3,5-triazine (TMTZ) was measured between 69 and 156 C for the liquid phase by differential scanning calorimetry (DSC) and between 20 and 10 C for the solid phase using vapor saturation. The data sets were harmonized by fitting the liquid-phase data to an unconstrained Antoine equation and the solid-phase data to a Clausius-Clapeyron equation anchored by the vapor pressure at the melting point based on the DSC data. The difference in slopes between the liquid- and solid-phase correlations at the melting point enables estimation of the heat of fusion of TMTZ. The vapor pressure of liquid-phase 2,4,6-trimethoxy-1,3,5-triazine (TMoxTZ) was measured by DSC. The solid-phase vapor pressure of TMoxTZ was estimated using a Clausius-Clapeyron equation, the vapor pressure at the melting point calculated from the DSC data, and the heat of fusion of TMTZ. The vapor pressures of TMTZ and TMoxTZ are compared to those of GB and VX, the most- and least-volatile classical chemical warfare nerve agents, respectively. Volatility, enthalpies of vaporization and sublimation, and entropy of vaporization were calculated for both compounds from correlation equations based on the vapor pressure data. The melting points of both compounds were determined by DSC.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2019
- Accession Number
- AD1086574
Entities
People
- Ann Brozena
- David E. Tevault
- Eric J. Bruni
- James H. Buchanan
Organizations
- United States Army Soldier Systems Center