Chlorofluorocarbon physical properties

Table 2. Physical Properties of Chlorofluorocarbon and Hydrocarbon Propellants...

Properties. The physical properties of aHphatic fluorine compounds containing chlorine are similar to those of the PECs or HECs (3,5). They usually have high densities and low boiling points, viscosities, and surface tensions. The irregularity in the boiling points of the fluorinated methanes, however, does not appear in the chlorofluorocarbons. Their boiling points consistently increase with the number of chlorines present. The properties of some CECs and HCECs are shown in Tables 3 and 4. 

Table 3. Physical Properties of Aliphatic Chlorofluorocarbons (CFCs) ...

New hydrofluorocarbons (HFCs) are replacing the chlorofluorocarbons (CFCs) and hydrochlorofluorocar-bons (HCFCs) phased out to lessen damage to the ozone layer. The DuPont website lists physical properties for a number of their refrigerants. 

For their physical properties, high stability and low toxicity, chlorofluorocarbons (CFC s) have found an extensive use, accompanying the development of various industrial fields. About forty years after their discovery in the early thirties [1], the hypothesis was advanced that, because of their stability, these compounds dispersed in the atmosphere arrived in the stratosphere where they caused a series of reactions generating chlorine and leading to an abnormal consumption of the ozone layer [2]. The Protocol of Montreal and its successive amendments have therefore placed limits to the production and the use of CFCs proscribed in industrialized coimtries since 1996 and fi om 2010 in the underdeveloped nations. 

What are the chemical and physical properties of chlorofluorocarbons Describe the CFC nomenclature. 

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