Feed Gas Selection
Literature predicts desired precursor is formed (i.e., CF2)
CF2N2, CF2=CF2 ? explosive CF2Cl2 ?????CFC, high ODP
CF2Br2, CF2HBr ? Br lowers ? CF3H ?????HFC, but high GWP
CHClF2 ? HCFC, ODP = 0.05 CH2F2 ? HFC, ODP = 0
C2H2F4 ? HFC, ODP = 0 HFPO (C3F6O) ? short lifetime
Check availability, phys. & chem. properties, and health & safety issues
CHClF2, CH2F2, C2H2F4, HFPO ? all readily available
Physical & chemical properties
Toxicity & hazards:
- CHClF2, CH2F2, C2H2F4 ? low reactivity, health risk (CHClF2 flammable)
- HFPO ? hexafluoroacetone impurity imposes health hazard