Tetrafluoroethylene
C2F4 · Perfluoroethene · R1114 · MS-122 · PFC-1114 · fluoroplast4 · Fluoroplast 4 · Tetrafluorethen
Identifikatoren & physikalische Daten
| CAS No. | 116-14-3 |
|---|---|
| Summenformel | C2F4 |
| Durchschnittliche Molmasse | 100,01 g/mol |
| Monoisotopische Masse | 99,99361265 g/mol |
| SMILES | FC(F)=C(F)F |
| InChIKey | BFKJFAAPBSQJPD-UHFFFAOYSA-N |
| PubChem CID | 8301 |
| ChEMBL | CHEMBL541730 |
| ChEBI | CHEBI:38866 |
| EC No. | 204-126-9 |
| DTXSID | DTXSID6021325 |
Chemische & physikalische Eigenschaften
| XLogP | 1,3 |
|---|---|
| Polarare Oberfläche (TPSA) | 0 |
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 4 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 6 |
| Formalladung | 0 |
| Komplexität | 55 |
| Schmelzpunkt | -142°C |
| Siedepunkt | -76.3°C |
| Dichte | 1.1507 |
| Brechungsindex | 1.2420 (estimate) |
| Löslichkeit | 110mg/L at 28℃ |
| Spezifische Wärmekapazität | Cp(gas): 0.8 J/(g·K), at 25℃ |
| Henry-Konstante | 1.6×10-5 mol/(m3Pa) at 25℃, Wilhelm et al. (1977) |
| Dielektrizitätskonstante | 1.9(Ambient) |
| Stabilität | Stable. Reactive when heated. |
| LogP (Verteilungskoeffizient) | 1.21 at 20℃ |
| CAS Datenbank | 116-14-3(CAS DataBase Reference) |
| NIST chemische Informationen | Ethene, tetrafluoro-(116-14-3) |
| EPA chemische Informationen | Tetrafluoroethene (116-14-3) |
| ECETOC JACC REPORT | Tetrafluoroethylene (116-14-3) |
Sicherheit & Vorschriften
| TSCA-Inventar-Status | TSCA listed |
|---|---|
| UN-Transportnummer | UN 1081 (TETRAFLUOROETHYLENE, STABILIZED) |
| R-Sätze (R) | 11 |
| Toxizität | LC50 (4 hr) in rats, mice, hamsters, guinea pigs (ppm): 37500-45000, 35000, 28500, 28000 (Kennedy) |
| Gefahrensymbole | C,F |
| hazard_note | Corrosive/Flammable |
| Sicherheitshinweise (S) | 16-36/37/39-45 |
| Gefahrenklasse | 2.1 |
| Gefahrstoffdaten | 116-14-3(Hazardous Substances Data) |
Anwendungen & Verwendung
Beschreibung
Tetrafluoroethylene is a synthetic, colorless, flammable gas that is insoluble in water. Tetrafluoroethylene is used primarily in the synthesis of polytetrafluoroethylene resins. It is also used as a monomer in the synthesis of copolymers and as a propellant for food product aerosols. When heated to decomposition, tetrafluoroethylene emits highly toxic fluorocarbon fumes. The primary route of human exposure to this compound is inhalation. Acute inhalation exposure to tetrafluoroethylene may result in irritation of the respiratory tract and buildup of fluid in the lungs (pulmonary edema). Contact with this gas can cause eye irritation. This chemical is reasonably anticipated to be a human carcinogen. (NCI05)
Verwenden
In manufacture of polymers and synthesis of fluorinated refrigerants, dielectric media and solvents. In vinyl polymerization, cycloalkylation and addition reactions.
Herstellung & Synthese
synthetische
Tetrafluoroethylene (TFE) is manufactured from chloroform. Chloroform is fluorinated by reaction with hydrogen fluoride to produce chlorodifluoromethane (R-22). Pyrolysis of chlorodifluoromethane then yields TFE.CHCl3 + 2 HF → CHClF2 + 2 HCl2CHClF2 → C2F4 + 2 HClA laboratory synthesis entails pyrolysis of a PTFE under a vacuum. The PTFE polymer "cracks" and depending on the pressure, produces mainly C2F4.