Combustion calorimetry of organic fluorine compounds by a rotating-bomb method
A rotating-bomb method was developed for the combustion calorimetry of organic fluorine compounds. Conventional methods of handling volatile samples could not be used, and a special technique with sealed, fused-quartz ampoules was devised. Some auxiliary data necessary for reduction of the calorimetric results to standard states were lacking: this difficulty was circumvented by use of suitable comparison or ''blank'' experiments. The following values, in kcal. mole/sup -1/, are reported for the standard heats of formation, ..delta..Hf/sup 0//sub 298.16/, of some organic fluorine compounds from graphite and gaseous hydrogen, oxygen and fluorine: o-fluorobenzoic acid (c), -134.3/sub 8/; m-fluorobenzoic acid(c), -137.8/sub 4/; p-fluorobenzoic acid (e), -138.9/sub 5/; fluorobenzene (liq.), -34.7/sub 5/; benzotrifluoride (liq.), -147.8/sub 5/ and polytetrafluoroethylene (granular, no heat treatment), -193./sub 5/. The samples of fluorobenzoic acids were purified by zone melting. p-Fluorobenzoic acid is proposed as a reference substance for intercomparison of bomb-calorimetric data for fluorine compounds among different laboratories.
- Research Organization:
- Bureau of Mines, Bartlesville, OK
- OSTI ID:
- 7305384
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 60:8; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
CALORIMETRY
ENTHALPY
FLUORINATED ALIPHATIC HYDROCARBONS
FORMATION HEAT
HALOGENATED ALIPHATIC HYDROCARBONS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
REACTION HEAT
TEFLON
THERMODYNAMIC PROPERTIES