Chlorofluorocarbons (CFCs) and their impact on Environment

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Presentation transcript:

Chlorofluorocarbons (CFCs) and their impact on Environment Fatima Parveen (Assist. Professor , Dept. of Chemistry, Govt. P. G. College Rajouri) Email: - fatimaparveen30@gmail.com

Objectives CFCs Introduction Sources Chemical Reactions Environmental impacts CFCs alternatives

Introduction CFCs commonly known as Freon CFCs are Synthetic chemicals Contain fluorine, chlorine and carbon (no hydrogen) Have a similar structure to alkanes, with hydrogen replaced by fluorine and chlorine. E.g. Dichlorodifluoromethane (Freon 12)

Source CFCs are anthropogenic compounds that are released into the atmosphere, since 1930s because of their wide use in air-conditioning, refrigeration, insulations, propellants (in aerosol applications), and solvents and packing materials.

Chemical Reactions

Environmental Impacts CFCs are greenhouse gases Absorb heat in the atmosphere, sending some of the absorbed heat back to the surface of the earth Contribute to global warming and climate change. UV radiation in stratosphere causes CFC molecules to dissociate into free radicals that contains one or more unpaired electrons.

A single chlorine atom can cause the conversion of thousands of ozone molecules to oxygen that leads to ozone depletion.

Source: Environmental Protection Agency, USA Ozone Depletion Source: Environmental Protection Agency, USA

Effects of Ozone Depletion Global Warming Increase in levels of skin cancer, cataracts, immune system impairment. Impact on crops and agriculture Impact on marine food cycle

CFC Alternatives Impact of Chlorofluorocarbon Replacements on Stratospheric Ozone Source: http://www.mp-docker.demon.co.uk/environmental_chemistry/topic_2b/page_4.html

CFCs, HCFCs and HFCs

Thanks