Triisobutylaluminum

  • Triisobutylalane
  • Tris(isobutyl)aluminum
  • Triisobutylaluminum
  • Tri-iso-butylaluminum
  • Aluminum, tris(2-methylpropyl)-
Formula
C12H27Al
Structure
Description
A colorless liquid.
Uses
Polymerization catalyst in manufacture of polybutadiene, polyisoprene, polypropylene.

Registry Numbers and Inventories.
CAS
100-99-2
EC (EINECS/ELINCS)
202-906-3
RTECS
BD2203500
RTECS class
Other
UN (DOT)
3052
Beilstein/Gmelin
3587328
Beilstein Reference
4-04-00-04400
Swiss Giftliste 1
G-7403
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C12H27Al
Formula mass
198.37
Boiling point, °C
33 - 35 (0.1 torr)
Density
0.7979 g/cm3 (20 C)
Viscosity
2.39 cp (20 C)
Surface tension
24 g/s2
Refractive index
1.4492 (20 C)
Heat of vaporization
46.5 kJ/mol
Heat of combustion
-8490 kJ/mol

Hazards and Protection.
Storage
Protect against physical damage. Storage should be isolated; outside or detached storage is preferable. Separate from combustible or reactive materials. Inside storage should be in a standard flammable liquid storage room or cabinet. Alkylaluminums aluminum alkyls. In undiluted condition. Must be kept under inert gas like nitrogen or argon, and all possibility of contact with water must be avoided. Solution containing not more than 20% of these compd in non-reactive solvents, however, can be handled without risk of spontaneous ignition. Aluminum alkyls must be stored in an inert atmosphere;. Sensitive to oxidation and hydrolysis in air. Trialkylaluminums in general, toxic materials or that can decompose into toxic components should be stored in cool ventilated place, out of sun, away from fire hazard. Substance must be periodically inspected and monitored. Incompatible materials should be isolated.
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
Full protective clothing, preferably of aluminized glass cloth; goggles; face shield; gloves. Protective clothing and high standard of training in necessary precautionary measures are essential for handling of materials.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Use a fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. ELIMINATE all ignition sources and prevent all contact with spilled material. Stop leak if you can do it without risk. Cover with DRY earth, DRY sand, or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean non-sparking tools to collect material and place it into loosley covered plastic containers for later disposal. This is a generic DOT guideline. EXCEPTION: For Dithionite (Hydrosulfite/Hydrosulphite) spills, UN1384, UN1923 and UN1929, dissolve with 5 parts water and collect for proper disposal.
Stability
Undiluted material is of relatively low thermal stability (decomp above 50 C) less sensitive to oxidation in air than trialkylaluminums aluminum alkyls.
Incompatibilities
Reacts violently with alcohols, phenols, amines, carbon dioxide, sulfur oxides, nitrogen oxides, halogens, and halogenated hydrocarbons, causing fire and explosion hazards.

Fire.
Autoignition, °C
Ignites spontaneously in air.
Fire fighting
Fire Extinguishing Agents Not to Be Used: Water, foam, halogenated extinguishing agentsFire Extinguishing Agents: Inert powder (e.g., sand, limestone), dry chemical
Fire potential
Alkylaluminums decompose at temperatures above 350 to 450 F to form corresponding flammable, unsaturated hydrocarbon gases (ethylene, propylene and butylene). Alkylaluminums certain polymerization catalysts, such as aluminum alkyls, react and burn violently on contact with water. Aluminum alkyls aluminum alkyls are organic aluminum compounds that are highly reactive and dangerous because of spontaneous burning in air. Ignite spontaneously on exposure to air. React violently with water, oxidizing agents, halogenated hydrocarbons, alcohols and other compounds containing oxygen in their structure. Decompose at temperatures above 350 deg to 450 F to form the corresponding flammable, unsaturated hydrocarbon gases (ethylene, propylene and butylene).
Hazards
May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. May react vigorously or explosively on contact with water. May decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished.
Combustion products
Dense smoke may cause metal-fume fever.
Health
3
 
Flammability
4
 
 
Reactivity
3
 
 
Special
W

Health.
Exposure limit(s)
OSHA: PEL (8 h TWA): 15 mg/m3.
Poison_Class
1
Exposure effects
Encephalopathy has been reported in patients with renal failure. This may range from mild personality changes and speech disorders to severe obtundation, seizures, coma and death. Fatal encephalopathy with status epilepticus has occurred after the use of aluminum-containing bone cement in vestibular neurectomies. Aluminum has also been linked to the histopathology of alzheimer disease. Occupational exposure to aluminum has been associated with cognitive deficits. Aluminum in drinking water has been linked to central nervous system birth defects. Some aluminum compounds have proven teratogenic in laboratory animals; however, overall, aluminum is not considered teratogenic.
   Ingestion
Burns of the esophagus and less commonly the stomach may occur after caustic ingestion; the absence of oral mucosal injury does not reliably exclude esophageal burns. Patients with stridor, drooling or vomiting are more likely to have esophageal burns.
   Inhalation
Stridor, dyspnea, upper airway injury, and pulmonary edema, especially following inhalation of vaporized caustics, may occur.
   Skin
Severe skin irritation and/or burns may occur.
   Eyes
See Skin.

First aid
 
   Ingestion
Mucosal if no respiratory compromise is present, dilute immediately with milk or water; no more than 8 ounces in adults and 4 ounces in children. Gastric ipecac contraindicated. Consider insertion of a small, flexible nasogastric or orogastric tube to suction gastric contents after recent large ingestions; the risk of further mucosal injury must be weighed against potential benefits.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothes. Irrigate exposed skin with copious amounts of water for at least 15 minutes or longer, depending on concentration, amount and duration of exposure to the chemical. A physician may need to examine the area if irritation or pain persist.
   Eyes
Home irrigation - exposed eyes should be irrigated with copious amounts of water for at least 30 minutes. An examination should always be performed. Ophthalmologic consultation should be obtained. Medical facility: irrigate with sterile 0.9% Saline for at least an hour or until the cul-de-sacs are free of particulate matter and returned to neutrality (confirm with pH paper).

Transport.
UN number
3052
Response guide
Hazard class
4.2
Packing Group
I
 
USCG CHRIS Code
TIA