Dichlorofluoromethane: Difference between revisions

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| PIN = Dichloro(fluoro)methane<!-- Parentheses are used according to Subsection P-16.5.1.3 of Nomenclature of Organic Chemistry – IUPAC Recommendations and Preferred Names 2013 (Blue Book) -->

| OtherNames = Dichlorofluoromethane<br />Fluorodichloromethane<br />Monofluorodichloromethane<br />Dichloromonofluoromethane<br />Freon 21<br />Refrigerant 21<br />R 21<br />HCFC 21<br />Algofrene Type 5<br />Arcton 7<br />Halon 112<br />UN 1029<br />Genetron 21

|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChEMBL_Ref = {{ebicite|correct|EBI}}

| CASNo_Ref = {{cascite|correct|CAS}}

| EINECS = 200-869-8

| PubChem = 6370

| UNNumber = 1029

| SMILES = ClC(Cl)F

| InChI = 1/CHCl2F/c2-1(3)4/h1H

| RTECS = PA8400000

|Section2={{Chembox Properties

| Formula = CHCl₂F

| MolarMass = 102.92{{nbsp}}g/mol

| Appearance = Colorless gas

| Odor = [[Ether]]-like<ref name=PGCH/>

| Density = {{ubl

| 1.405{{nbsp}}kg/m³ at 9{{nbsp}}°C

| 1.366{{nbsp}}kg/m³ at 25{{nbsp}}°C

}}

| MeltingPtC = -135

| BoilingPtC = 8.92

| Solubility = 9.420{{nbsp}}g/L at 30{{nbsp}}°C

| LogP = 1.55

| HenryConstant = 0.19{{nbsp}}(mol·kg·bar){{sup|−1}}

| VaporPressure = 160{{nbsp}}kPa

| MagSus = −48.8·10⁻⁶{{nbsp}}cm³/mol

| ThermalConductivity = 0.0086{{nbsp}}W/m·K (300{{nbsp}}K)<ref>Touloukian, Y.S., Liley, P.E., and Saxena, S.C. Thermophysical properties of matter - the TPRC data series. Volume 3. Thermal conductivity - nonmetallic liquids and gases. Data book. 1970.</ref>

|Section3={{Chembox Hazards

| GHSPictograms = {{GHS04}}{{GHS07}}

| GHSSignalWord = Warning

| HPhrases = {{H-phrases|280|420}}

| PPhrases = {{P-phrases|410+403|502}}

| FlashPt = Non-flammable

| FlashPt_ref = <ref name=PGCH/>

| AutoignitionPtC = 522

| AutoignitionPt_notes =

| PEL = TWA 1000{{nbsp}}ppm (4200{{nbsp}}mg/m³)<ref name=PGCH>{{PGCH|0197}}</ref>

| IDLH = 5000{{nbsp}}ppm<ref name=PGCH/>

| REL = TWA 10{{nbsp}}ppm (40{{nbsp}}mg/m³)<ref name=PGCH/>

| LC50 = {{ubl

| >800,000{{nbsp}}mg/m³ (mouse, 2{{nbsp}}hr)

| 49,900{{nbsp}}ppm (rat, 4{{nbsp}}hr)<ref name=IDLH>{{IDLH|75434|Dichloromonofluoromethane}}</ref>

}}

| LCLo = {{ubl

| 100,000{{nbsp}}ppm (guinea pig, <1{{nbsp}}hr)

| 100,000{{nbsp}}ppm (mouse, <1{{nbsp}}hr)<ref name=IDLH/>

}}

'''Dichlorofluoromethane''' or '''Freon 21''' or '''R 21''' is a [[halomethane]] or [[hydrochlorofluorocarbon]] with the formula CHCl₂F. It is a colorless and odorless gas. It is produced by fluorination of [[chloroform]] using a catalyst such as [[antimony trifluoride]]:<ref name=Ullmann/>

:CHCl₃ + HF → CHCl₂F + HCl

Dichlorofluoromethane was used as a [[propellant]] and refrigerant. Due to its role in [[ozone depletion]], dichlorofluoromethane has been largely phased out. It has [[ozone depletion potential]] 0.04. Production and consumption has been since 2004 reduced to 15% of level from 1989 and it is to be phased out in 2015 according to [[Montreal Protocol]].

Pyrolysis of a mixture of dichlorofluoromethane and [[chlorofluoromethane]] gives [[hexafluorobenzene]]:<ref name=Ullmann>{{Ullmann | last1= Dagani|first1=M. J. | last2= Barda|first2=H. J. | last3= Benya|first3=T. J. | last4= Sanders|first4=D. C. | title = Bromine Compounds | doi = 10.1002/14356007.a04_405 }}</ref>

:3 CHCl₂F + 3 CH₂ClF → C₆F₆ + 9 HCl

==Additional physical data==

Its critical point is at 178.5&nbsp;°C (451.7{{nbsp}}K) and 5.17{{nbsp}}MPa (51.7{{nbsp}}bar). At temperatures from 5{{nbsp}}K to 105{{nbsp}}K, it has one phase in the [[space group]] Pbca.

==Safety==

Its toxicity is comparable to that of [[chloroform]]. Its [[threshold limit value|TLV]] is 10{{nbsp}}ppm.<ref name=Ullmann/>

==References==

{{Reflist}}

* [http://encyclopedia.airliquide.com/encyclopedia.asp?GasID=87 Entry at Air Gas Liquide Encyclopaedia] {{Webarchive|url=https://web.archive.org/web/20210218030523/http://encyclopedia.airliquide.com/encyclopedia.asp?GasID=87 |date=2021-02-18 }}