it is slides for CFC

2. “ A
Choloro Fluoro Carbon
is an organic compound that contains
only carbon,chlorine and fluorine
,produced as volatile derivative of
methane ,ethane and propane. They are
also called by their dupont brand name
as freon”

3. • Carbon in CFC bonds with tetrahedral symmetry
•Chlorine and Fluorine differ greatly in size and effective
charge from hydroge
•Methane derived CFCs deviate from perfect tetrahedal
symmetry
•Generated by free radical reactions

4. •Discovered in 1928
•Thomas Midgley-an American engineer discovered CFC
•After being used originally as a replacement for things such
as Ammonia and Sulphur dioxide in refrigerators,CFCs were
discovered to be useful as a propallant in aerosol cans
•In mid-1970s ,scientists began to discover a connection
between CFCs and depletion of ozone layer

5. •Volatile – less than their parent alkanes
•CFCs have higher boiling points
•Less flammable
•Densities of CFCs are higher than their corresponding
alkanes

6. I. CCl2F2(g) ------- Cl(g) + CClF2(g)
II. Cl(g) + O3(g) ------- ClO(g)+ CClF2(g)
III. Cl(g) + O3(g) ------- ClO(g)+ O2(g)
IV. ClO(g)+O(g) ------- O2(g) + Cl(g)
V. 2Clo(g) ------- 2Cl(g)+ O2(g)
Cl(g) +CH4 -------- HCl(g)+ CH3(g)
ClO(g)+NO2 -------- ClONO2(g)
2Cl(g) -------- Cl2(g)

7. CFCs are mainly used as:
Refrigerants
Boiling agents
Propellants in medical applications
Degreasing solvents
In packing of materials
To make teflon

8. Overexposure at 11% or more can cause
• Dizziness
•Loss of concentration
•Central nervous system depression
•Cardiac arrhythmia

9. •Active ozone reducer
•It is a green house gas with a much potential to enhance the
greenhouse effect than co2
•Referred to as an atmospheric window due to relative
transparency of the atmosphere
•Low concentration of CFCs allow their effects to increse
linearly with mass

10. •Less use of household products containing CFCs
•Safe appliance disposal
•Industrial efforts –less use of CFCs
1. Using triton seperator-Manure
• Policy changes-encourage legislation that reduces CFCs
emission
• Ozone therapy
• Pipelines and carbon tax
• Air purifier

11. IN 1978 the United States banned the use of CFCs such as
Freon in aerosol cans ,the beginning of a long series of
regulatory action against their use. “Alliance for Responsible
CFC Policy” to question anti-CFC science,but in a turnabout
in 1986 DuPont ,with new patients in hand ,publicly
condemned CFCs.
Use of certain chloroalkanes as solvents for large scale
application,such as dry cleaning,have been phased out on the
IPPC directive on green house gases in 1994 and by VOC
directive of the EU in 1997

12. The authorities around different parts of the world are
working hard on stopping the excess use of CFC to save
atmosphere as well as ozone layer. Now its our time to stop it
using in any kind of material. Indeed we must have to
promote to avoid its use