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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]
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.
The Laken Riley Act is a United States law that requires the U.S. Department of Homeland Security to detain illegal immigrants [1] admitting to, [2] charged with, or convicted of theft-related crimes, [3] assaulting a police officer, or a crime that results in death or serious bodily injury like drunk driving.
Mineral oil used with R-12 is not compatible with R-134a. Some oils designed for conversion to R-134a are advertised as compatible with residual R-12 mineral oil. Illegal replacements for R-12 include highly flammable hydrocarbon blends such as HC-12a, the flammability of which has caused injuries and deaths. [10] [11]
As such, sites linking to sites which acted as proxies to The Pirate Bay were themselves added to the list of banned sites, including piratebayproxy.co.uk, piratebayproxylist.com and ukbay.org. This led to the indirect blocking (or hiding) of sites at the following domains, among others: [22] [23]
H&R model 999 (.22 LR nine-shot top break revolver) Note: Pre-1898 solid frame revolvers were designed for use with black powder loads. Using smokeless powder rounds with these revolvers may cause damage to the revolver and/or injury to the user. Note: Many of the above guns are stamped as "H&R .22 Special"/".22 W.R.F." or ".22 Winchester Rim Fire"
Disgraced music superstar R. Kelly was dealt a legal blow on Wednesday after an appeals court in New York denied the singer's challenge to his 30-year-prison sentence and conviction on ...
R-phrases (short for risk phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations. The list was consolidated and republished in Directive 2001/59/EC, [ 1 ] where translations into other EU languages may be found.