Dichlorodifluoromethane Freon

Freon 12 dichlorodifluoromethane Frigen 12 23 180 5 Conditionally stable -2.5 86 Trogamid T Specimen 4 mm (0.158 in) thick sample for weight change... 

The formed mixture is composed of trichlorofluoromethane (Freon-11) and dichlorodifluoromethane (Freon-12). These compounds are used as aerosols and as refrigerants. Due to the depleting effect of chlorofluorocarbons (CFCs) on the ozone layer, the production of these compounds may be reduced appreciably. 

Typical freons are trichlorofluoromethane, CFC13 (called Freon-11) and dichlorodifluoromethane, CF2CI2 (called Freon-12). 

Dichlorodifluoromethane Freon 12 under Saturated Alkyl Halides... 

Dif I uorodicb loromethane. See Dichlorodifluoromethane in Vol 5 of Encycl, p D1209-L and under "Freon—12" in CondChemDict (1961), 515-L, under "FREON"... 

In connection with the study of the role Freon compounds play in the depletion of ozone in the atmosphere, a demand has arisen for 13C-labeled fluorinated hydrocarbons in infrared spectroscopic examination. For this purpose,13C-isotopically enriched trichlorofluoromethane, dichlorodifluoromethane, chlorotrifluoromethane, trifluoromethane, chlorodifluoromethane, and dichlorofluoromethane have been prepared from 13CC 4 and 13CHC13.73... 

In a dump site, you find an old 3-liter pressure bottle with a pressure gauge that indicates a pressure of 2.7 bar. The temperature is 10°C. From the label you can see that the bottle contains Freon 12 (i.e., dichlorodifluoromethane, CC12F2). You wonder how much Freon 12 is still left in bottle. Try to answer this question. In the CRC Handbook of Chemistry and Physics (Lide, 1995) you find the following data on CC12F2 ... 

For an assessment of the global distribution of persistent volatile halogenated hydrocarbons, the solubility and activity coefficients of such compounds in natural waters need to be known. Warner and Weiss (1985) have determined the solubilities of dichlorodifluoromethane (Freon 12) at 1 bar partial pressure at various temperatures in freshwater and in seawater (35.8%o salinity) ... 

Estimate the molar volume Vt of dichlorodifluoromethane CC12F2 (also called freon-12 or CFC-12) (a) from its liquid density and (b) with the element contribution method by Fuller (Table 18.2). 

Owing to the extreme chemical activity of fluorine, the chief uses of this element arise in connection with the production of its compounds. Thus, sodium fluoride is commonly used as a flux, as an insecticide, and as a wood preservative. Ammonium fluoride is sometimes used as a disinfectant. The compound dichlorodifluoromethane (CC12F2) is used as an insecticide propellent and is an important commercial refrigerant (Freon), particularly well suited for use in domestic refrigeration units. 

In 1928, Thomas Midgley invented the first CFC compound. Because they were useful but safe, they were referred to as miracle compounds. In particular, dichlorodifluoromethane, CC12F2, also known as Freon, was discovered to be an efficient refrigerant. 

Chlorotrifluoromethane or Trifluoromono-chloromethane ("Freon—13 ), CC1F3, mw 104.47 colorless, non-toxic, nonflammable gas with ethereal odor fr p —181°, bp —81.4°. Can be prepd from dichlorodifluoromethane in vapor phase with A1C1S catalyst. Used as a refrigerant- also for hardening of metals and in pharmaceutical processing and as dielectric aerospace chemical Refs 1) Beil. 1, < 42> 2) CondChemDict... 

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