811-97-2 1,1,1,2-Tetrafluoroethane

Temperature Pressure Density Volume Int. energy Enthalpy Entropy C, CF Sound speed Joule-Thomson Therm, cond. Viscosity 

Typical uncertainties are 0.05% for density, 0.02% for vapor pressure, 0.5% to 1% for heat capacity, 0.05% for vapor speed of sound, and 1% for liquid speed of sound, except in the critical region. The uncertainty in viscosity is 1.5% along the saturated-liquid line, 3% in the liquid phase, 0.5% in the dilute gas, 3% to 5% in the vapor phase, and 5% in the supercritical region, rising to 8% at pressures above 40 MPa. Below 200 K, the uncertainty is 8%. The uncertainty in thermal conductivity is 5%. 

2-26 Pressure-enthalpy diagram for Refrigerant 134a. Properties computed with the NIST REFPROP Database, Version 7.0 (Lemmon, E. W., McLinden, M. O., and Huber, M. L., 2002, NIST Standard Reference Database 23, NIST Reference Fluid Thermodynamic and Transport Properties—REFPROP, Version 7.0, Standard Reference Data Program, National Institute of Standards and Technology), based on the equation of state of Tillner-Roth, R., and Baehr, H. D., An International Standard Formulation of the Thermodynamic Properties of 1,1,1,2-Tetrafluoroethane (HFC-134a) Covering Temperatures from 170 K to 455 K at Pressures up to 70 MPa, /. Phys. Chem. Ref. Data 23(5) 657-729, 1994. 

TABLE 2-279 Thermodynamic Properties of R-141b, 1,1-Dichloro-l-Fluoroethane 

---

Compare the two staggered conformations of 1 1 2 2 tetrafluoroethane on Learning By Mod elmg Do they differ in respect to their dipole moments How" ... 

Young, Fukuhara and Bigelow repeated the vapor-phase reaction of fluorine/nitrogen mixtures with ethane, obtaining pentafluoroethane. 1,1.2,2-tetrafluoroethane. and 1,1,2-tri-fluoroethane, together with products of C — C bond fission. 

Catalytic amounts of antimony(V) chloride (3 — 5%) enchance the fluorinating activity of chlorine monofluoride. In the presence of antimony(V) chloride, chlorine monofluoride reacts with CFC-113 (l,l,2-trichloro-l,2,2-trifluoroethane) at — 40 to — 60 C to give CFC-114 (1,2-dichloro-1,1,2,2-tetrafluoroethane).107... 

Ethane30 over cobalt(III) fluoride at 165=C gives mainly pentafluoroethane (38%) and hexafluoroethane (40%), together with small amounts of all the other possible C2FnH6 n isomers. In a batch reactor at 100°C, 1,1-difluoroethane (26%). 1,2-difluoroethane (30%), and 1,1,2-trifluoroethane (30%) arc the major products.25 Potassium tetrafluorocobaltate(III) is much less reactive than cobalt(III) fluoride and even at 420 C mainly gives30 a lower degree of fluorination 1,2-difluoroethane (25%), 1,1-difluoroethane (11%), 1,1,2-trifluoroethane (29%), and 1,1,2,2-tetrafluoroethane (10%). 

Maezawa, Y., Sato, H., Watanabe, K. (1991b) Liquid densities and vapor pressures of 1,1,2,2-tetrafluoroethane (HFC 134) and 1,1-dichloro-l-fluoroethane (HCFC 141b). J. Chem. Eng. Data 36, 151-155. 

---