Departamento de Ciências Agrárias
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Browsing Departamento de Ciências Agrárias by Subject "1-chloro-1,1-difluoroethane"
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- Density of HCFC 142b and of its mixture with HCFC 22Publication . Sousa, Ana T.; Fialho, Paulo; Nieto de Castro, Carlos A.; Tufeu, R.; Le Neindre, B.The density of the binary mixture 40/60 wt% of monochlorodifluoromethane (HCFC 22) and 1-chloro-1,1-difluoroethane (HCFC 142b) in the liquid phase, has been measured between 300 and 370 K and pressures up to 19 MPa, with an oscillating fork sendimeter, operating in a relative mode. Toluene and vacuum have been used as calibrating fluids. The accuracy of the data is 0.08 %. An equation for the dependence of density in temperature and pressure for HCFC 142b and for this mixture is also presented.
- The thermal conductivity of 1-chloro-1,1-difluoroethane (HCFC-142b)Publication . Sousa, Ana T.; Fialho, Paulo; Nieto de Castro, Carlos A.; Tufeu, R.; Le Neindre, B.The thermal conductivity of 1-chloro-l,l-difluoroethane (HCFC-142b) has been measured in the temperature range 290 to 504 K and pressures up to 20 MPa with a concentric-cylinder apparatus operating in a steady-state mode. These temperature and pressure ranges cover all fluid states. The estimated accuracy of the method is about 2 %. The density dependence of the thermal conductivity has been studied in the liquid region.