HFC-227ea
Identification
Synonyms: 1,1,1,2,3,3,3-Heptafluoropropane (IUPAC);
2H-Heptafluoropropane; HFC-227, R-227; HFC227ea;
CAS No.: 431-89-0
EC No: 207-079-2
Molecular Weight170.03
Molecular Formula: C3HF7
Structural Formula:
b.p. (1 atm): -16.4°C
m.p.: -131°C
Density (16°C): 1.46g/ml
Vapor Pressure: 0.45Mpa
Solubility in water: 260mg/L
ODP: 0
GWP: 3500
Preparation
On industrial scale, HFC-227ea is prepared by addition reaction
between hexafluoropropylene(HFP) and hydrofluoric acid under
condition of catalyst: CF3-CF=CF2 + HF CF3-CHF2-CF3
Application
1) As the first non ozone-depleting alternative for Halon 1301,
HFC-227ea (Heptafluoropropane) is used in fire suppression systems
in data-processing and telecommunication facilities. Effective fire
suppression requires introducing a concentration of the HFC-227ea
agent between 6.25% and 9% depending on the hazard being protected.
Its NOAEL level for cardiac sensitization is 9%. The US EPA allows
concentration of 9% volume in occupied spaces without mandated
egress time, or up to 10.5% for a limited time. Most fire
suppression systems are designed to provide concentration of
6.25-9%.
In addition, HFC-227ea leaves no residue on valuable equipment
after discharge. HFC-227ea contains no chlorine or bromine atoms,
presenting no ozone depletion effect, but its global warming
potential is high. Its atmospheric lifetime is approximated between
31 and 42 years.
2)HFC-227ea is used as an aerosol propellant in pharmaceutical
metered dose inhalers such as those used for dispensing asthma
medication.
Specification
Items | Specification |
HFC-227ea purity, % | 99.9 min |
moisture, mg/kg | 10 max |
acidity, mg/kg | 1 max |
non-volatiles, wt% | 0.01 max |
Standard Packaging
1000kgs/926L steel cylinder, 13 Cylinders/FCL, or ISO Tank
Risks and Safety Information
HFC-227ea (Heptafluoropropane) is regulated as hazardous gas.
Toxicity LC50(4hr, rat), ppm: 800000 min
UN 3296. Class 2.2
At high temperatures, HFC-227ea (heptafluoropropane) will decompose
and produce hydrogen fluoride, presenting sharp, pungent odour,
which can be perceived in concentrations far below a dangerous
level. Prior to re-entry of a room where HFC-227ea system has been
activated to suppress a fire, the atmosphere should be tested.
