1,1-Difluoroethylene

1,1-Difluoroethylene, also known as vinylidene fluoride, is a hydrofluoroolefin. It is a flammable gas. Global production in 1999 was approximately 33,000 metric tons.[3] It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride.

1,1-Difluoroethylene
Names
IUPAC name
1,1-Difluoroethene
Other names
Difluoro-1,1-ethylene; R-1132a; Halocarbon 1132 A; Freon 1132A; Vinylidene difluoride; Vinylidene fluoride[1]
Identifiers
3D model (JSmol)
Abbreviations VDF
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.789
EC Number
  • 200-867-7
KEGG
RTECS number
  • KW0560000
UNII
UN number 1959
Properties
C2H2F2
Molar mass 64.035 g·mol−1
Appearance Colorless gas[2]
Odor Slightly ethereal[1]
Density 2.89 kg/m3 (vapor, 0 °C)[2]
1.122 g/mL (liquid, -84 °C)[2]
Melting point −144 °C (−227 °F; 129 K)[2]
Boiling point −84 °C (−119 °F; 189 K)[2]
0.254 g/L[3]
Vapor pressure 35.2 atm (20°C)[4]
Hazards
Main hazards Flammable[4]
GHS pictograms
GHS Signal word Warning
GHS hazard statements
 H315, H319, H335
P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
380 °C (716 °F; 653 K)[1]
Explosive limits 5.5%-21.3%[4]
NIOSH (US health exposure limits):
PEL (Permissible)
 none[4]
REL (Recommended)
 TWA 1 ppm C 5 ppm[4]
IDLH (Immediate danger)
 N.D.[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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:.[5]

or loss of hydrogen fluoride from 1,1,1-trifluoroethane:[6]

gollark: If you had an actual problem to solve, you would want it to be simpler.
gollark: No, you're just arbitrarily complicating things.
gollark: Unless you somehow need one really fancy machine.
gollark: But in most cases the cost of machines is not a significant factor.
gollark: This "efficiency" metric is mostly unnecessary.

See also

References
  1. "Difluoro-1,1-ethylene". Gas Encyclopaedia. Air Liquide.
  2. Record in the GESTIS Substance Database of the Institute for Occupational Safety and Health
  3. "1,1'-Difluoroethylene (VDF,VF2)" (PDF). International Programme on Chemical Safety.
  4. NIOSH Pocket Guide to Chemical Hazards. "#0662". National Institute for Occupational Safety and Health (NIOSH).
  5. Kirk-Othmer Encyclopedia of Chemical Technology (4 ed.). John Wiley and Sons. 1994. pp. V11. Retrieved 8 July 2017.
  6. Gerhartz, W (1985). Ullmann's Encyclopedia of Industrial Chemistry (5 ed.). VCH Publisher. pp. VA11. Retrieved 8 July 2017.
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