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Hydrochlorofluorocarbon (HCFC): A haloalkane containing hydrogen, chlorine and fluorine atoms.
HCFCs were the first substances used as replacements for CFCs.
The carbon-hydrogen (C-H) bonds in HCFCs are susceptible to attack by reactive radicals and atoms in the troposphere, and are therefore decomposed there to a significant extent. However, they still diffuse into the stratosphere and cause significant ozone destruction.
Hydrofluorocarbon (HFC): A haloalkane containing hydrogen and fluorine atoms.
HFCs are now widely used as replacements for CFCs.
They contain carbon-hydrogen (C-H) bonds that cause them to undergo some decomposition in the troposphere, and contain no carbon-chlorine (C-Cl) bonds that would form chlorine free radicals in the stratosphere. Thus, the ozone-destroying capacity of HFCs is zero.
The most widely used HFC is 1,1,1,2-tetrafluoroethane, which is used primarily in refrigeration and air conditioning. It is more expensive and less efficient than the CFCs it replaces.
Hydrocarbon: A compound containing only hydrogen and carbon. Hydrocarbons have replaced CFCs as propellants in spray cans.
HCFCs were the first substances used as replacements for CFCs.
The carbon-hydrogen (C-H) bonds in HCFCs are susceptible to attack by reactive radicals and atoms in the troposphere, and are therefore decomposed there to a significant extent. However, they still diffuse into the stratosphere and cause significant ozone destruction.
Hydrofluorocarbon (HFC): A haloalkane containing hydrogen and fluorine atoms.
HFCs are now widely used as replacements for CFCs.
They contain carbon-hydrogen (C-H) bonds that cause them to undergo some decomposition in the troposphere, and contain no carbon-chlorine (C-Cl) bonds that would form chlorine free radicals in the stratosphere. Thus, the ozone-destroying capacity of HFCs is zero.
The most widely used HFC is 1,1,1,2-tetrafluoroethane, which is used primarily in refrigeration and air conditioning. It is more expensive and less efficient than the CFCs it replaces.
Hydrocarbon: A compound containing only hydrogen and carbon. Hydrocarbons have replaced CFCs as propellants in spray cans.
Fun Facts!
- The advantages of using HCFCs are that the hydrogen reacts and results in a shorter atmospheric lifetime of 13 years.
- In the late 1970s, due to the damage to the ozone layer, alternative options to CFCs have been introduced. This includes hydrochlorofluorocarbons (HCFCs) which are noted to be less stable and thus disintegrate before reaching the ozone layer
- All replacement compounds for CFCs are evaluated for their ozone depletion potential (ODP)
- Hydrochlorofluorocarbons (HCFCs) contain chlorine atoms which are removed in the lower atmosphere by the presence of hydrogen.
- The advantages of using HCFCs are that the hydrogen reacts and results in a shorter atmospheric lifetime of 13 years.
- In the late 1970s, due to the damage to the ozone layer, alternative options to CFCs have been introduced. This includes hydrochlorofluorocarbons (HCFCs) which are noted to be less stable and thus disintegrate before reaching the ozone layer
- All replacement compounds for CFCs are evaluated for their ozone depletion potential (ODP)
- Hydrochlorofluorocarbons (HCFCs) contain chlorine atoms which are removed in the lower atmosphere by the presence of hydrogen.