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Names | |||
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Preferred IUPAC name 1,1-Difluoroethene | |||
Other names Difluoro-1,1-ethylene; R-1132a; Halocarbon 1132 A; Freon 1132A; Vinylidene difluoride; Vinylidene fluoride | |||
Identifiers | |||
CAS Number | |||
3D model (JSmol) | |||
Abbreviations | VDF | ||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
ECHA InfoCard | 100.000.789 | ||
EC Number |
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KEGG | |||
PubChem CID | |||
RTECS number |
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UNII | |||
UN number | 1959 | ||
CompTox Dashboard (EPA) | |||
InChI
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SMILES
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Properties | |||
Chemical formula | C2H2F2 | ||
Molar mass | 64.035 g·mol | ||
Appearance | Colorless gas | ||
Odor | Slightly ethereal | ||
Density | 2.89 kg/m (vapor, 0 °C) 1.122 g/mL (liquid, -84 °C) | ||
Melting point | −144 °C (−227 °F; 129 K) | ||
Boiling point | −84 °C (−119 °F; 189 K) | ||
Solubility in water | 0.254 g/L | ||
Vapor pressure | 35.2 atm (20°C) | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards | Flammable | ||
GHS labelling: | |||
Pictograms | |||
Signal word | Warning | ||
Hazard statements | H315, H319, H335 | ||
Precautionary statements | P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501 | ||
Autoignition temperature |
380 °C (716 °F; 653 K) | ||
Explosive limits | 5.5%-21.3% | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) | none | ||
REL (Recommended) | TWA 1 ppm C 5 ppm | ||
IDLH (Immediate danger) | N.D. | ||
Related compounds | |||
Related compounds | 1,2-Difluoroethylene; Fluoroethylene; Trifluoroethylene; 2-Chloro-1,1-difluoroethylene; | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references |
1,1-Difluoroethylene, also known as vinylidene fluoride, is a hydrofluoroolefin. This colorless, flammable gas is a difluorinated derivative of ethylene. Global production in 1999 was approximately 33,000 metric tons. It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride and FKM.
Preparation
1,1-Difluoroethylene can be prepared by elimination reaction from a 1,1,1-trihaloethane compound, for example, loss of hydrogen chloride from 1-chloro-1,1-difluoroethane:
or loss of hydrogen fluoride from 1,1,1-trifluoroethane:
See also
References
- ^ "Difluoro-1,1-ethylene". Gas Encyclopaedia. Air Liquide. Archived from the original on 2016-03-03. Retrieved 2012-04-23.
- ^ Record in the GESTIS Substance Database of the Institute for Occupational Safety and Health
- ^ "1,1'-Difluoroethylene (VDF,VF2)" (PDF). International Programme on Chemical Safety. Archived from the original (PDF) on 2012-01-04. Retrieved 2012-04-23.
- ^ NIOSH Pocket Guide to Chemical Hazards. "#0662". National Institute for Occupational Safety and Health (NIOSH).
- Kirk-Othmer Encyclopedia of Chemical Technology (4 ed.). John Wiley and Sons. 1994. pp. V11. Retrieved 8 July 2017.
- Siegemund, Günter; Schwertfeger, Werner; Feiring, Andrew; Smart, Bruce; Behr, Fred; Vogel, Herward; McKusick, Blaine (2000). "Fluorine Compounds, Organic". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a11_349. ISBN 978-3-527-30385-4.