Dichlorofluoromethane

  • Fluorodichloromethane
  • Refrigerant 21
Formula
CHCl2F
Structure
Description
Dichlorofluoromethane is a colorless, odorless gas.
Uses
Fully halogenated chlorofluorocarbons (cfcs) such as dichlorofluoromethane were scheduled for production phase-out in 1987 by the montreal protocol. Although originally scheduled for 50% production phase-out by the year 2000 in developed countries, the worsening ozone depletion has forced acceleration of the cfc phase-out.

Registry Numbers and Inventories.
CAS
75-43-4
EC (EINECS/ELINCS)
200-869-8
RTECS
PA8400000
RTECS class
Reproductive Effector
UN (DOT)
1029
Beilstein/Gmelin
1731041
Beilstein Reference
4-01-00-00039
Swiss Giftliste 1
G-2011
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
CHCl2F
Formula mass
102.92
Melting point, °C
-135
Boiling point, °C
9
Vapor pressure, mmHg
1340 (25 C)
Vapor density (air=1)
3.82
Critical temperature
178
Critical pressure
51.1
Density
1.48 g/cm3 (20 C)
Solubility in water
10 g/L
Viscosity
0.56 cp (-90 C)
Surface tension
18 g/s2 @ 25 C
Refractive index
1.3724 (9C)
Partition coefficient, pKow
1.55
Heat of vaporization
25.2 kj/mol
Heat of combustion
-231 kJ/mol

Hazards and Protection.
Storage
Materials must be stored in places that are cool. Provide adequate ventilation. Further precaution is to locate. Area. Away from areas of fire hazard.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
Any self contained breathing apparatus with a full facepiece and operated in a pressure demand or other positive pressure mode or any supplied air respirator with a full facepiece and operated in a pressure demand or other positive pressure mode in combination with an auxiliary self contained breathing apparatus operated in pressure demand or other positive pressure mode.
Small spills/leaks
Attempt to stop leak if without undue personnel hazard.
Stability
Condition contributing to instability: Heat.
Incompatibilities
Incompatible with the following: Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium; acid; acid fumes.
Decomposition
When heated to decomposition it emits very toxic fumes of hydrogen chloride and hydrogen fluoride. Toxic gases and vapors (such as hydrogen chloride, phosgene and hydrogen fluoride) may be released when refrigerant 21 decomposes. All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal. Decomposition products of the chlorofluorocarbons will include hydroflouric and hydrochloric acid along with smaller amounts of phosgene and carbonyl fluoride. The last compound is very unstable to hydrolysis and quickly changes to hydrofluoric acid and carbon dioxide in the presence of moisture. Fluorocarbons appearance of toxic decomposition products serves as warning of occurrence of thermal decomposition and detection of sharp acrid odor warns of presence.

Fire.
Flash Point,°C
-54
Autoignition, °C
552
Upper exp. limit, %
54.7
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Weakly flammable.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground.
Combustion products
Toxic fumes of chlorine and fluorine may be produced in fire.

Health.
Poison_Class
5
Exposure effects
Headache, dizziness, and disorientation are common. Cerebral edema may be found on autopsy. Dichlorodifluoromethane was not teratogenic in rats and rabbits. <br>The reproductive effects of 1,1,1,2-tetrafluoroethane were studied in rats. No adverse effects on reproductive performance was noted or on the development, maturation or reproductive performance of up to two successive generations.
   Ingestion
Nausea may develop. Ingestion of a small amount of trichlorofluoromethane resulted in necrosis and perforation of the stomach in one patient.
   Inhalation
Pulmonary irritation, bronchial constriction, cough, dyspnea, and chest tightness may develop after inhalation. Chronic pulmonary hyperreactivity may occur. Adult respiratory distress syndrome has been reported following acute inhalational exposures. Pulmonary edema is an autopsy finding in fatal cases.
   Skin
Dermal contact may result in defatting, irritation or contact dermatitis. Severe frostbite has been reported as an effect of freon exposure. Injection causes transient pain, erythema and edema.
   Eyes
EYES - Eye irritation occurs with ambient exposure. Frostbite of the lids may be severe. NOSE - Nasal irritation occurs with ambient exposure. THROAT - Irritation occurs. Frostbite of the lips, tongue, buccal mucosa and hard palate developed in a man after deliberate inhalation.

First aid
 
   Ingestion
These substances may cause frostbite to the upper airway and gastrointestinal tract after ingestion. Administer oxygen and manage airway as clinically indicated. Emesis, activated charcoal, and gastric lavage are not recommended.
   Inhalation
Provide a quiet calm atmosphere to prevent adrenaline surge if the patient is seen before the onset of cardiac arrhythmias. Minimize physical exertion.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. If frostbite has occurred, refer to dermal treatment in the main body of this document for rewarming.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. Ophthamologic consultation should be obtained in any symptomatic patients.

Transport.
UN number
1029
Response guide
Hazard class
2.2
USCG CHRIS Code
DFM
 
Std. Transport #
4904574