Which compound is hfc

Halons are fluorocarbons not hydrofluorocarbons, i. Halon no hydrogen number nomenclature is relatively simple; each halon has an abcd number, where:. Acknowledgement: Thanks to Jack Calvert, Environmental Sciences Division, Oak Ridge National Laboratory, for a constructive review of this work which added substantially to its content.

Contact Us. Hydrofluorocarbons HFCs also act to warm the planet. Man-made compounds such as chlorofluorocarbons CFCs , hydrofluorocarbons HCFCs and halons destroy ozone in the upper atmosphere stratosphere. The stratospheric ozone layer makes life possible by shielding the earth from harmful ultraviolet UV-B rays generated from the sun. Decreased concentration of stratospheric ozone allows increased amounts of UV-B to reach the earth's surface.

Stratospheric ozone loss can result in potential harm to human health and the environment, including:. Concern over these effects may make it necessary to regulate production and use of these compounds at some point in the future. Such restrictions have been proposed in the Kyoto Protocol. Regular, careful measurements of air from remote locations show that global concentrations of HFCs have increased rapidly over time Figure 1.

Measurements of air stored in containers that were originally filled as early as and measurements of even older air trapped in snow above Antarctica or Greenland have allowed scientists at NOAA, CSIRO Australia , and the University of East Anglia UK to reconstruct how concentrations of these gases have changed in the atmosphere over the past years.

Traditionally fluorine is associated with high oxidation state inorganic systems - and we have published work in these areas involving the use of elemental fluorine we have a fluorine cell in order to generate elemental fluorine electrochemically and on alternative strategies.

New, simple, methods of introducing fluorine into molecules are always in demand since so many modern drugs, plant chemicals etc are fluorine-containing materials. We are investigating the catalytic introduction of fluorine using common, readily available and cheap starting materials, such as KF. If you would like further details of any of these areas then please contact us, details are given on the contacts page.

There is also a complete list of publications available. We greatfully acknowledge support, of various sorts, for our research from:. A full publication list is available, as is a list of the many students and visitors who have actually generated these results.