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Chemical Name: Diisobutylaluminum Hydride
Common Synonyms: DIBAL-H, DIBAL, DIBAH
Chemical Formula: C8H18AlH
CAS Number: 1191-15-7
Dangerous Properties: This compound reacts violently with water, releasing flammable hydrogen gas. DIBAL-H acts as a strong reducing agent and ignites spontaneously in air due to its pyrophoric nature. It presents fire and explosion hazards in handling, storage, and transport. Skin or eye contact with liquid or vapor can cause severe burns and tissue damage.
Health Risks: Inhalation, skin absorption, or eye exposure can produce life-threatening injuries. Brief exposure leads to irritation, while persistent contact causes chemical burns. Vapors can irritate the respiratory tract, and ingestion may result in severe internal damage. People lacking experience misjudge its risks, underestimating how quickly DIBAL-H can set off a chemical emergency.
Main Ingredient: Diisobutylaluminum Hydride—typically found at concentrations between 50% and 100% in solvents such as toluene or hexane.
Impurities: May contain traces of aluminum, alkyl byproducts, solvents, and moisture-sensitive components depending on manufacturing and packaging.
Mixtures: Often supplied as a solution in hydrocarbon solvents, further complicating flammability and handling.
Inhalation: Remove person to fresh air immediately. Seek urgent medical help if coughing, shortness of breath, or irritation develop. Always use rescue breathing equipment prepared for potential chemical reactions.
Skin Contact: Rapidly remove contaminated clothing and flush skin with copious running water for at least 30 minutes. Medical evaluation is essential. Burns may worsen in the hours after exposure.
Eye Contact: Irrigate eyes gently for at least 15 minutes with water while holding eyelids apart. Avoid rubbing. Immediate specialized medical care makes a significant difference in recovery.
Ingestion: Never induce vomiting. Rinse mouth, do not swallow rinses, obtain emergency help. Complications can occur quickly, so professional oversight is critical.
General Advice: Do not touch contaminated skin or eyes without gloves, and have emergency shower and eyewash stations close by wherever DIBAL-H opens or transfers take place.
Suitable Extinguishing Media: Use dry powder extinguishers meant for metal fires (Class D), not water or foam. In my experience, water or standard foam reacts dangerously, spreading fire or causing explosions.
Fire Hazards: Fire gives off dense, toxic fumes of aluminum oxide and hydrocarbons; so, fighting a fire means full protective gear, supplied air respirators, and keeping as much distance as possible.
Procedures: Isolate the area and evacuate non-emergency personnel. Untrained responders face immense risks due to the compound’s speed of ignition and reactivity.
Additional Measures: Cool containers from a safe distance with dry powder. Watch for reignition since DIBAL-H can smolder unseen. Always plan entry and exit routes prior to any response.
Containment: Stop leak only if it can be done safely. Keep unnecessary personnel away and eliminate all potential ignition sources. Non-sparking tools reduce the chance of unintended fires. I have seen firsthand that hasty, unplanned approaches only escalate risks due to rapid reaction with moisture in the air.
Clean-Up: Cover spilled liquid with dry, inert absorbents such as sodium carbonate, dry sand, or vermiculite—never with water-containing materials. Collect residues in lined, hermetically-sealed containers to prevent further exposure or ignition.
Protective Measures: Wear full-body chemical protective clothing, face shields, and gloves rated for strong reducing agents. Keep your skin and eyes completely covered, and never underestimate the fumes and reactivity that persist after cleanup appears complete.
Ventilation: Increase local exhaust and general room ventilation to clear toxic vapors. DIBAL-H calls for careful, methodical response rather than simple mop-and-bucket routines.
Storage Requirements: Store under nitrogen or dry argon in tightly sealed containers. Keep away from all sources of moisture, open flames, or oxidizing agents.
Handling Practices: Use only in fume hoods or ventilated glove boxes specifically designed for pyrophoric materials. Each transfer requires planning, dry lines, and ready access to sand or powder extinguishers.
Storage Area: Designate a specific room or cabinet labeled for flammable, reactive chemicals. Store at temperatures below 25°C and prevent direct sunlight or heat sources from contact with containers.
Incompatibles: Water, alcohols, acids, and oxidizers must be physically separated from storage and work areas to avoid accidental reaction. One incident in a nearby lab stemmed from careless storage near a sink—interventions like secondary containment help prevent these easily missed cross-contaminations.
Respiratory Protection: Tight-fitting, positive pressure respirators or supplied air hoods offer the safest protection from vapors or fumes. Wearing a standard surgical mask does not block toxic exposures.
Skin and Eye Protection: Wear chemical-resistant coveralls, heavy nitrile or neoprene gloves, and goggles plus full-face shields. Regular safety glasses alone leave eyes exposed to splashes and fumes.
Ventilation: Chemical fume hoods with non-sparking fans and strict maintenance avoid vapor build-up. Even seemingly minor lapses, like open waste bins, have led to near-miss incidents in research settings.
Control Measures: Keep safety showers and eyewash stations within easy reach. Train coworkers on emergency procedures so no one handles spills or exposures alone.
Physical State: Colorless to pale yellow solution, often in toluene or hexane.
Odor: Hydrocarbon-like, with a sharp chemical tang.
Boiling Point: Solution-dependent, typically around 150°C for DIBAL-H.
Melting Point: Data varies with solvent, but pure DIBAL-H melts below room temperature.
Solubility: Immiscible with water, dissolves in most organic solvents.
Vapor Pressure: Moderate—induces slow, evaporative risk in open air.
Reactivity: Reacts explosively with water, releasing hydrogen gas; incompatible with air, acids, and oxidizers.
Other Notable Properties: Shipped as viscous solutions to limit risk, but even small spills react fiercely with air and moisture.
Chemical Stability: Unstable in presence of moisture or oxidizing agents; stable only under dry nitrogen or argon.
Hazardous Reactions: Vigorous reactions with water, acids, and even mild oxidizers. Risk of spontaneous ignition persists even at room temperature.
Decomposition Products: Burning generates aluminum oxide, carbon monoxide, hydrocarbons, and hydrogen gas—each with different hazards.
Conditions to Avoid: Exposure to air, water, alcohols, and elevated temperatures always raises risks, even in sealed labs with good routines.
Polymerization: Generally does not polymerize, but side reactions may yield unknown, potentially sensitive byproducts during improper storage or disposal.
Acute Health Effects: Short-term exposures cause skin, eye, and respiratory burns. Inhalation can inflame airways, trigger coughing, and produce pulmonary edema if doses are high.
Chronic Health Effects: Long-term contact increases risk of chemical sensitivity and can leave scars where burns heal poorly.
Sensitization Risk: Some workers report allergies or skin rashes from repeat low-level exposure.
Other Notes: No conclusive links to cancer or birth defects, but lacking studies mean extra caution makes sense, especially for vulnerable groups.
Aquatic Toxicity: DIBAL-H expands on contact with water, harming aquatic organisms rapidly. Hydrocarbon solvents spread insoluble layers across water surfaces, suffocating fish and invertebrates.
Persistence: Breaks down into less reactive aluminum compounds over time but remains hazardous in the environment due to solvent content.
Bioaccumulation: Not highly bioaccumulative, yet solvents persist in sediments and water, magnifying local toxicity.
Land Impact: Spills in soil disrupt local ecosystems. Plant roots exposed to DIBAL-H wither, often failing to recover, and aluminum residues seep into groundwater without proper cleanup.
Destruction: Neutralize excess DIBAL-H carefully with isopropanol or tertiary-butanol under strictly controlled conditions, never with water. Residues must be treated as hazardous waste.
Containers: Triple-rinse bottles and equipment with dry solvent before landfill disposal. Seal and label all containers for specialized incineration or waste processing plants.
Legal Requirements: Disposal follows local and national hazardous materials regulations, with audits and inspections often required in research or industrial facilities.
Personal Experience: Lack of training or preparation for proper DIBAL-H disposal has caused chemical injuries and lab evacuations—rigorous checklists and staff rehearsals improve outcomes significantly.
Shipping Category: Classified as pyrophoric liquid and flammable liquid, subject to strict international transport rules.
Packing Instructions: Use UN-approved containers, separated from incompatible goods. Couriers inspect packaging, and even small leaks prompt instant return and investigation.
Precautions in Transit: Temperature control, shock-absorbing packaging, and clear hazard labels matter—skipping these steps leads to accidents both on the road and at the warehouse.
Regulatory Codes: Subject to road, air, rail, and sea rules for dangerous goods; every courier and handler should undergo special training.
Hazard Classifications: Listed as highly flammable, pyrophoric, and toxic by national chemical safety boards.
Labelling Requirements: Facilities must use clear, standardized hazard symbols and risk phrases in storage and handling areas.
Workplace Laws: Government regulations set strict employee training, air monitoring, and PPE standards for anyone handling DIBAL-H. Safety audits and frequent refresher courses keep accidents at bay.
Community Protections: Many countries mandate emergency preparedness plans for large users, and direct communication with local fire services smooths the response in case of chemical incidents.
