Ethane, refrigerated liquid

  • Bimethyl
  • Dimethyl
  • Methylmethane
  • Ethyl hydride
Formula
CH3CH3
Structure
Description
A colorless odorless very cold liquid.
Uses
In the prodn of ethylene by high temp thermal cracking, as a feedstock in the prodn of vinyl chloride, in the synthesis of chlorinated hydrocarbons, as a refrigerant.

Registry Numbers and Inventories.
CAS
74-84-0
EC (EINECS/ELINCS)
200-814-8
EC Index Number
601-002-00-X
EC Class
Extremely flammable
RTECS
KH3800000
RTECS class
Other
UN (DOT)
1035
Merck
12,3767
Beilstein/Gmelin
1730718
Beilstein Reference
4-01-00-00108
Swiss Giftliste 1
G-1151
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H6
Formula mass
30.07
Melting point, °C
-173.3
Boiling point, °C
-88.6
Vapor pressure, mmHg
34960 (4 C)
Vapor density (air=1)
1.04
Odor Threshold Odor threshold 84.5 ppm
Critical temperature
32
Critical pressure
48.2
Density
1.357 g/cm3 (20 C) (liquid)
Solubility in water
Soluble
Viscosity
0.877 cp (0 C)
Surface tension
3.24 (0.4 torr)
Refractive index
1.00076 (0 C)
Dielectric constant
1 (-72 C)
Partition coefficient, pKow
1.81
Thermal expansion
0.0028/K at -45 C
Heat of fusion
2.8 kJ/mol
Heat of vaporization
70.4 kJ/mol
Heat of combustion
-1561 kJ/mol

Hazards and Protection.
Storage
Storage temp: -128F; Venting: safety relief
A B1
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Protection
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable.
Incompatibilities
Incompatible with strong oxidizing agents like nitric acid.
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
-135
Autoignition, °C
515
Upper exp. limit, %
12.5
Lower exp. limit, %
3
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
EXTREMELY FLAMMABLE.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated. Ruptured cylinders may rocket.
Health
1
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 1000 ppm; mg/m3 simple axphyxiant (ACGIH 1995-1996).
Poison_Class
5
Exposure effects
Rapid breathing and rapid heart rate are common. In severe cases abnormally low blood pressure, apnea, and cardiac arrest develop. Various disturbances including headache, dizziness, mood disturbances, numbness of the extremities, sleepiness, mental confusion, poor judgement and coordination, and memory loss may occur. Prolonged or severe hypoxia results in unconsciousness. Prolonged asphyxia may produce CNS injury. Hemiparesis has been reported with volatile substance abuse. Cerebral edema with brainstem herniation may occur. Seizures have been reported following intentional inhalation.
   Ingestion
Nausea, vomiting, and gastrointestinal hemorrhage may develop.
   Inhalation
High vapor concentrations may produce reversible CNS depression or asphyxia. Symptoms include giddiness, headache, dizziness and nausia. In extreme cases, consciousness can be lost and may be quickly followed by death.
   Skin
Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.
   Eyes
Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Administer 100% humidified supplemental oxygen with assisted ventilation as required. If hypoxia has been severe or prolonged, carefully evaluate for neurologic sequelae and provide supportive treatment as indicated.
   Skin
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.
   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.

Transport.
UN number
1035
Response guide
Hazard class
2.1
USCG CHRIS Code
ETH
 
Std. Transport #
4905732
 
IMO Gas Code
B