Thermal and thermooxidative stability of ozone-safe freons

Journal Article · Wed May 10 04:00:00 EDT 1995 · Russian Journal of Organic Chemistry

OSTI ID:137022

Buravtsev, N N; Grigor`ev, A S; Kolbanovskii, Y A; Ovsyannikov, A A ^[1]

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1. Russian Academy of Sciences, Moscow (Russian Federation). A.V. Topchiev Inst. of Petrochemical Synthesis

The thermal stability of freons 134-a (CF{sub 3}CH{sub 2}F), 134 (CHF{sub 2}CHF{sub 2}), and 133-a (CF{sub 3}CH{sub 2}Cl) was studied experimentally by the pulsed adiabatic compression method. The conversion of the freons, beginning at a value of 0.0002, was determined from the carbon balance of the reaction products, calculated from the chromatographic data. The Arrhenius expressions for the total rate constants of thermal decomposition of the freons are presented. The intermediates of the thermal transformations of the freons were recorded by kinetic spectroscopy in the ultraviolet and visible regions. The UV spectrum of the carbene:CHCF{sub 3} with characteristic absorption maxima at {lambda} 235 and 430 nm is described for the first time.

• OSTI ID: 137022
• Journal Information: Russian Journal of Organic Chemistry, Journal Name: Russian Journal of Organic Chemistry Journal Issue: 12Pt1 Vol. 30; ISSN RJOCEQ; ISSN 1070-4280
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AGING
CHLOROFLUOROCARBONS
FREONS
MATERIAL SUBSTITUTION
MATERIALS TESTING
MEASURING METHODS
OZONE LAYER
REACTION INTERMEDIATES
REFRIGERANTS
THERMAL DEGRADATION
THERMODYNAMIC PROPERTIES