HCFCs Refrigerants, structure and properties

HCFCs Refrigerants

 Compiled by Rolando Delgado y Sergio Montelier  

 

   Versión en Español                                                                            English version

 


 

HCFC-22 (chloro-difluoro-methane)

 

Chemical Formula: CHClF2 

 
Chemical structure:
 

 

    H    

 

    |    

 

F - C - Cl

 

    |    

 

    F    


Common name:
Chlorodifluoromethane, Monochlorodifluoromethane

 

Common synonyms:
Chlorofluorocarbon 22;

Difluorochloromethane;Difluoromonochloromethane;

FC 22; Flugene™ 22; Fluorocarbon 22;

HCFC 22; HFA 22; Hydrochlorofluorocarbon 22; Hydrofluoroalkane22;

Propellant 22; R 22; Refrigerant 22;

Conversion factors:
1 ppm = 3.54 mg/m3
1 mg/ m3 = 0.282 ppm

 

Properties

 

Chlorodifluoromethane is a non-flammable, colorless and nearly odorless gas under normal conditions. A large proportion is used as a chemical intermediate and therefore not emitted into the atmosphere. Other important uses are in refrigeration and in air conditioning systems; with present practice, most of the chlorodifluoromethane so used will eventually be emitted into the atmosphere.

 

Its moderate water solubility and low octanol/water partition coefficient indicate a negligible bioaccumulation potential. Contamination of water and food would not be expected from its physical and chemical properties and has not been reported.


 

HCFC-123 (2,2-dichloro-1,1,1- trifluoro-ethane)

Chemical Formula: CHCl2CF3
 
Chemical structure:

 

    Cl   F    

 

    |   |    

 

H - C - C - F

 

    |   |    

 

    Cl   F    


Common name:
1,1-dichloro-2,2,2-trifluoroethane; 2,2-dichloro-1,1,1-trifluoroethane

 

Common synonyms:
Fluorocarbon 123; FC-123; F-123

HFA-123; HCFC-123

Propellant 123; Refrigerant 123; R-123

Conversion factors:
1 ppm = 6.25 mg/m3 at 25º C
1 mg/m³ = 0.160 ppm at 25º C


Properties

1,1-Dichloro-2,2,2-trifluoroethane is a non-flammable, volatile, colorless liquid under ambient conditions and has a faint odour of ether. It is produced and used as a substitute for the fully halogenated chlorofluorocarbons with comparable physical properties since it has more favorable environmental properties.

Dichlorotrifluoroethane would not be considered to be readily biodegradable. Studies conducted in algae, Daphnia, and rainbow trout indicated a moderate level of toxicity to aquatic organisms. The octanol/water partition coefficient (Pow, = 2.0-2.8) is indicative of a low potential to bioaccumulate.

 

HCFC-124 (1 chloro-1,2,2,2-tetrafluoroethane)

1-Chloro-1,2,2,2-tetrafluoroethane (chlorotetrafluoroethane), a non-flammable colourless gas at room temperature.

Chemical structure:
      F   F    
      |   |    
  Cl - C - C - F
      |   |    
      H   F    
Chemical Formula: CHClF-CF3

Common name:
1-chloro-1,2,2,2-tetrafluoroethane
chlorotetrafluoroethane

IUPAC Name:
Ethane, 2-chloro-1,1,1,2-tetrafluoro-

Common synonyms:
1,1,1,2-tetrafluoro-2-chloroethane, Fluorocarbon 124,HFA-124; HCFC-124

Conversion factors:
1 ppm = 5.58 mg/m3 at 25ºC

1 mg/m³ = 0.179 ppm at 25ºC


 

HCFC-141b (1 ,1-dichloro-1-fluoroethane)

 
Chemical structure :
      Cl   H    
      |   |    
  Cl - C - C - H
      |   |    
      F   H    
Chemical Formula:
CCl2F-CH3

Common name:
1,1-dichloro-1-fluoroethane, dichlorofluoroethane

Common synonyms:
Ethane 1,1-dichloro-1-fluoro
HFA 141b, HCFC 141b, R141b

Conversion factors:
1 ppm = 4.85 mg/m3 (20ºC, 1013 hPa)
1 mg/m3 = 0.206 ppm (20ºC, 1013 hPa)


Properties

1,1-dichloro-1-fluoroethane (dichlorofluoroethane) is produced and used as a substitute for fully halogenated chlorofluorocarbons with comparable physical properties since it has more favorable environmental properties

It is a volatile non flammable colorless liquid, with a weak ethereal odor and is slightly soluble in water. The low octanol/water partition coefficient (Pow = 2,3) indicates a low potential for bioaccumulation. The physical properties and results of acute ecotoxicity studies indicate that dichlorofluoroethane presents a low risk to the aquatic environment.

 

HCFC-142b (1-chloro-1,1-difluoroethane)

Chemical structure:
      F   H    
      |   |    
  Cl - C - C - H
      |   |    
      F   H    
Chemical Formula:
CClF2CH3

Common name:
Chlorodifluoroethane

IUPAC name:
1-chloro-1,1-difluoroethane

Common synonyms:
HCFC-142b, HFA-142b


 Source: Fluorocarbons and Sulphur Hexachloride. European Fluorocarbons Technical Committee (EFCTC).

 http://www/fluorocarbons.org/en/families/hcfcs.html


Molecular Weight and Boiling Point of HCFCs

 

Designation

Formula

Molecular Weight

Boiling Point

oC

oF

HCFC – 22

CHClF2

86,47

-40,75

-41,36

HCFC – 124

CHClFCF3

136,50

-11,00

12,20

HCFC - 142b

CH3CClF2

100,47

-9,80

14,40

HCFC - 123

CF3CHCl2

152,90

27,90

82,20

HCFC – 141b

CH3CCl2F

116,95

32,00

89,60

 

Source: Langley Billy C.(1994):  Refrigerant Management. The Recovery, Recycling, and Reclaiming of CFCs.  Chapter 2: CFCs Their Problems and Alternatives. Types of Refrigerants (page 13). Delmar Publishers Inc.TM


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