353-59-3 Usage
Description
BROMOCHLORODIFLUOROMETHANE, also known as Chlorodifluorobromomethane, is a colorless, nonflammable gas or liquid under pressure. It is a one-carbon compound in which the hydrogens of methane have been replaced by two fluorines, a bromine, and a chlorine. BROMOCHLORODIFLUOROMETHANE is mildly toxic by inhalation and can asphyxiate by the displacement of air. Exposure of the container to prolonged heat or fire may cause BROMOCHLORODIFLUOROMETHANE to rupture violently and rocket.
Uses
Used in Refrigeration Industry:
BROMOCHLORODIFLUOROMETHANE is used as a refrigerant gas for cooling systems due to its unique properties.
Used in Fire Extinguishing Systems:
BROMOCHLORODIFLUOROMETHANE is used in 'vapourising liquid'-type fire extinguishers, although its use is now generally banned under the Montreal Protocol (ozone-depleting substances), it is still used in certain applications, such as in aviation.
Reactivity Profile
BROMOCHLORODIFLUOROMETHANE is chemically inert in many situations, but can react violently with strong reducing agents such as the very active metals and the active metals. Can react with strong oxidizing agents or weaker oxidizing agents under extremes of temperature.
Health Hazard
Vapors may cause dizziness or asphyxiation without warning. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.
Fire Hazard
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket.
Safety Profile
Mutation data reported.
An asphyxiant. See also ARGON for
description of inert gas asphyxiants. When
heated to decomposition it emits very toxic
fumes of Br-, Cl-, and F-
Potential Exposure
Used as a refrigerant and fire extinguishing agent.
Shipping
UN1974 Chlorodifluorobromomethane or
Refrigerant gas R-12B1, Hazard Class: 2.2; Labels: 2.2-
Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a well-ventilated
truck. Protect cylinder and labels from physical damage.
The owner of the compressed gas cylinder is the only entity
allowed by federal law (49CFR) to transport and refill
them. It is a violation of transportation regulations to refill
compressed gas cylinders without the express written
permission of the owner.
Incompatibilities
The liquefied gas poured into water may
be violently explosive. This is due to the phase transition
from superheated liquid to vapor. Chlorodifluorobromomethane is generally chemically inert; however, it can
react violently with strong reducing agents such as hydrides
and highly active metals. It will react with strong oxidizers
(chlorates, nitrates, peroxides, permanganates, perchlorates,
chlorine, bromine, fluorine, etc.); contact may cause fires
or explosions. Keep away from alkaline materials, strong
bases, strong acids, oxoacids, epoxides strong oxidizing
agents. It can also react with weak oxidizers under extreme
temperatures.
Waste Disposal
Return refillable compressed
gas cylinders to supplier.
Check Digit Verification of cas no
The CAS Registry Mumber 353-59-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,5 and 3 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 353-59:
(5*3)+(4*5)+(3*3)+(2*5)+(1*9)=63
63 % 10 = 3
So 353-59-3 is a valid CAS Registry Number.
InChI:InChI=1/CBrClF2/c2-1(3,4)5
353-59-3Relevant articles and documents
Reaction of Atomic Bromine with Difluorochloromethane. The Heat of Formation of the CClF2 Radical and the Do (CClF2-H) Bond Dissociation Energy
Miyokawa, K.,Tschuikow-Roux, E.
, p. 7328 - 7331 (1992)
The gas-phase photobromination of CHClF2 (1) in the presence of CH3Cl (2) as competitor has been studied in the temperature range 80-150 deg C at halomethane pressures of ca. 35 Torr and a Br2 pressure of ca. 2.3 Torr.The temperature dependence of the rate constant ratio is found to obey the Arrhenius expression ln (k1/k2) = (-0.0885 +/- 0.0580) - (1144 +/- 20)/T.This result is combined with an earlier relative study of CH3Cl (2) vs C2H6 (3) and a recent direct determination by kinetic spectroscopy of the rate constant for the bromination of ethane (k3) to obtain absolute rate parameters for the reaction CHClF2 + Br -> CClF2 + HBr.Using a justifiable approximation concerning the magnitude of the activation energy difference for the reverse reactions between any two competitors of similar complexity, and other thermochemical data from the literature, the following quantities have been derived: ΔHfo298(CClF2) = -66.7 +/- 2 kcal mol-1 and Do(CClF2-H) = 100.7 +/- 2 kcal mol-1 where the uncwrtainties are conservative estimates.On the basis of the new value of k3, activation energies for the bromination of CH4 and other halomethanes are reported.
Kinetics of the Reactions of Halogenated Methyl Radicals with Molecular Bromine
Timonen, R. S.,Seetula, J. A.,Niiranen, J.,Gutman, D.
, p. 4009 - 4014 (2007/10/02)
The kinetics of seven reactions of halogenated methyl radicals (CH2Cl, CHCl2, CFCl2, CF2Cl, CF3, CH2Br, and CH2I) with molecular bromine were studied by using a heatable tubular reactor coupled to a photoionization mass spectrometer.Rate constants were measured as a function of temperature, typically between 296 and 532 K.Arrhenius activation energies were found to be small negative values (typically -2 kJ mol-1) for all reactions studied with the exception of that of the CF3 + Br2 reaction (whose activation energy is positive, but which could not determined accurately).The pattern of reactivity among 11 reactions of substituted methyl radicals with Br2 (which includes the 7 reactions studied here and 4 C(H)x(CH3)3-x + Br2 reactions (x = 0-3) studied earlier) has been accounted for by the inductive effect of the substituent atoms or groups.The sum of the Pauling electronegativities of these substituents provides a useful measure of their total inductive effect on the reaction rate constant.
PREPARATION OF HALO-F-METHANES VIA POTASSIUM FLUORIDE-HALOGEN CLEAVAGE OF HALO-F-METHYLPHOSPHONIUM SALTS
Burton, D. J.,Shin-Ya, S.,Kesling, H.S.
, p. 89 - 98 (2007/10/02)
Treatment of halo-F-methylphosphonium salts with potassium fluoride and halogen (I2, Br2, ICl, IBr) gives modest yields of halo-F-methanes.This method of preparation augments the classical Hunsdiecker approach to these materials.