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R-22 use is being phased out in developing countries, where it is largely used for air conditioning applications. R-22 is prepared from chloroform: HCCl 3 + 2 HF → HCF 2 Cl + 2 HCl. An important application of R-22 is as a precursor to tetrafluoroethylene. This conversion involves pyrolysis to give difluorocarbene, which dimerizes: [3]
Robinson R22 hovering. The R22 is a light, two-place, single reciprocating-engined helicopter, with a semirigid, two-bladed main rotor and a two-bladed tail rotor.
Fiat R.22, an Italian reconnaissance aircraft; Ndonga dialect; R22: Harmful if swallowed, a risk phrase; R-22 Spearhead, a fictional starfighter in the Star Wars universe; Robinson R22, an American helicopter; R22 refrigerant
For example, R-22 has one carbon atom, one hydrogen atom (2−1 = 1), two fluorine atoms, and one chlorine atom (4−2−1 = 1), so it is chlorodifluoromethane, while R-134 has two carbon atoms (2−1 = 1), two hydrogen atoms (3−1 = 2), four fluorine atoms, and no chlorine atoms (6−2−4 = 0), so it is one of the tetrafluoroethanes. This ...
Chlorodifluoromethane (R-22 or HCFC-22), a type of Freon. [9] [10] Dichlorodifluoromethane (R-12 or CFC-12), the most commonly used Freon brand refrigerant prior to its ban in many countries in 1996 and total ban in 2010. 1,1,1,2-Tetrafluoroethane (R-134a or HFC-134a), one of the main replacements for the formerly widespread R-12.
R-22 HCFC-22: CHClF 2: Chlorodifluoromethane: 5280: 1760: Being phased out: A widely used hydrochlorofluorocarbon (HCFC) and powerful greenhouse gas with a GWP equal to 1810. Worldwide production of R-22 in 2008 was about 800 Gg per year, up from about 450 Gg per year in 1998. R-438A (MO-99) is a R-22 replacement. [71] R-123 HCFC-123 CHCl 2 CF 3
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The R22 was a New York City Subway car built by the St. Louis Car Company from 1957 to 1958. The cars were a "follow-up" or supplemental stock for the A Division's R21s and closely resemble them.
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