Category: Transient Hot Wire
Author(s): Artur Dahlberg, Daniel Cederkrantz, Herbert Sixta, Ilkka KilpelC$inen, Joanna Witos, Jussi Helminen, Nahla Osmanbegovic, Paulus HyvC$ri, Petri Uusi-Kyyny, Susanne K. Wiedmer, Ville Alopaeus, Zachariah Steven Baird
Keywords: density, Heat Capacity, liquid, liquid vapor pressure, mTBD, PC-SAFT, Thermal Conductivity, thermodynamic properties, THW, Transient Hot-Wire, Vapor pressure
Abstract: 7-Methyl-1,5,7-triazabicyclo[4,40]dec-5-ene (mTBD) is an important industrial chemical that is commonly used as a catalyst. Prior to the research conducted by Baird et al, the only available data on this chemical pertained to its density and a single vapor pressure value that is provided on chemical safety data sheets. This paper presents the first reliable, publicly available data on the thermodynamic and transport properties of mTBD. These values include, liquid vapor pressure (temperature from 318.23 K to 451.2 K and pressure from 11.1 Pa to 10 000 Pa), liquid compressed density (293.15 K to 473.15 K and 0.0092 MPa to 15.788 MPa), liquid isobaric heat capacity (312.48 K to 391.50 K), melting properties, liquid thermal conductivity (299.0 K to 372.9 K), liquid refractive index (293.15 K to 343.15 K), liquid viscosity (290.79 K to 363.00 K), liquid vaporization (318.23 K to 451.2 K), liquid thermal expansion coefficient (293.15 K to 473.15 K), and liquid isothermal compressibility of mTBD (293.15 K to 473.15 K). The thermal conductivity of mTBD was measured using the THW-L2 Liquid Thermal Conductivity Meter from Thermtest Inc. These transport and thermal properties were then compared with other similar compounds including, 1,1,3,3-tetramethylguanidine (TMG), 1,5-diazabicyclo (4.3.0)non-5-ene (DBN), 1.8-diazabicyclo[5.4.0]undec-7-ene (DBU). The PC-SAFT equation was used to model the thermodynamic properties of mTBD, DBN, DBU, and TMG. This model was optimized using experimental data to compare each set of data.
Reference: International Journal of Thermophysics (2019) 40:71