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Chemical Name: Pivalic Anhydride
Synonyms: Trimethylacetic anhydride
Chemical Formula: C10H18O3
Common Uses: Lab reagent, intermediate in organic synthesis, especially for introducing pivaloyl groups into molecules
Appearance: Colorless or pale liquid with a strong, pungent odor
Molecular Weight: 186.25 g/mol
CAS Number: 4415-87-6
Physical Hazards: Pivalic Anhydride releases irritating or even corrosive fumes on contact with moisture or acids, so working outside a ventilated enclosure rarely ends well. Skin contact leads to redness and blisters, eyes risk permanent damage.
Health Hazards: Breathing in vapors can burn the airways and lungs. Direct contact leads to pain, burns, and risk of absorption through skin. Ingestion brings rapid burning pain, nausea, possible systemic toxicity.
Environmental Hazards: Water-reactive; Pivalic Anhydride hydrolyzes, releasing pivalic acid and harmful emissions. Release threatens aquatic life, fouling the worksite and putting compliance at risk.
GHS Label: Features pictograms for corrosive, acute toxic, and environmental hazard.
Pivalic Anhydride: ≥99%
Impurities: Traces of pivalic acid by hydrolysis, sometimes trace alkane contaminants from synthesis routes.
Substances of Concern: No commonly used stabilizers or additives; focus sits squarely on the risks of the pure material.
Inhalation: Get to fresh air quickly. If symptoms like coughing or burning show up, medical attention matters. Oxygen support and airway monitoring often prove necessary.
Skin Contact: Strip off contaminated clothes and rinse skin for at least 15 minutes under running water—this is non-negotiable. Immediate hospital trips make sense for deep burns.
Eye Contact: Hold eyes open and flush with water endlessly, then get to a doctor straight away. Hesitation increases the chances of lasting eye damage.
Ingestion: Rinse mouth, do not induce vomiting, seek immediate medical care. Chemical burns in the mouth or esophagus require specialized treatment.
Suitable Extinguishing Media: Dry chemical, CO2, or foam snuffs out small fires. Water can cause violent reactions, so careful assessment is crucial.
Special Hazards: Fumes become corrosive and toxic under fire, including carbon monoxide, carbon dioxide, and pivalic acid mist. The dangerous run-off from firefighting and chemical reactions threatens first responders.
Protective Equipment: Firefighters should double down on full-body protection, including self-contained breathing apparatus. Evacuation of non-essential staff avoids tragedy.
Advice: Isolate scene, use remote extinguishing when possible, keep combustibles clear—Pivalic Anhydride makes no apologies.
Personal Precautions: Don full chemical-resistant gear and eye protection. Breathing protection is non-negotiable.
Environmental Precautions: Block liquid from drains and waterways. Small spills call for immediate neutralization with soda ash or lime, large ones for expert hazmat teams.
Clean-Up: Absorb with inert materials like vermiculite, scoop into a closed container, and send for disposal. Once finished, rigorous decon prevents future exposure.
Worksite Hygiene: In areas where this chemical gets handled, showers and eyewash stations need to be ready at all times.
Handling: Pivalic Anhydride reacts with water and even humid air, so every procedure starts in a fume hood. Tools and containers ought to be bone dry. Static discharge leads to ignition far too easily, so grounding procedures matter.
Storage: Keep away from moisture, oxidizers, and acids. Use airtight, corrosion-proof containers, clearly labeled, and kept locked with restricted access. Regular inspections cut down on surprises.
Incompatible Materials: Storing near water-containing substances, amines, strong bases, or acids creates risk of dangerous hydrolysis or violent reaction.
Engineering Controls: Fume hoods, forced ventilation, and splash guards trump basic aids. Any chance of splash or vapor release deserves the best local extraction.
Personal Protective Equipment: Chemical-resistant gloves (butyl or viton work better than latex), full-length acid-resistant coat, goggles with face shield, respiratory protection for high concentrations.
Hygiene: Wash thoroughly before eating or smoking. Soiled clothing never rides home with workers.
Occupational Exposure Limits: No specific national OELs known, but following the limits set for similar acid anhydrides is smart policy.
Physical State: Liquid
Color: Colorless
Odor: Sharp, acrid, distinctly pungent
Boiling Point: ~180°C
Melting Point: ~-15°C
Density: About 0.96 g/cm³ at 20°C
Solubility: Reacts with water, releasing pivalic acid
Vapor Pressure: Moderate at room temperature
Flammability: Combustible
Flash Point: ~70°C (open cup)
Chemical Stability: Stable under dry, clean storage conditions, but hydrolyzes in water or moist air.
Reactivity: Vigorous hydrolysis with water or acid, producing heat and corrosive vapors. Dangerous with alcohols, amines, bases.
Decomposition: Generates pivalic acid, fumes, and potentially carbon oxides.
Special Conditions: Avoid heat, humidity, open flames, spark sources, and incompatible substances.
Acute Effects: Inhaling vapors damages lung tissue and causes choking or even chemical pneumonitis. Skin contact brings redness, blistering, necrosis. Eye exposure threatens irreversible loss of sight.
Chronic Effects: No human epidemiology reports, but chronic exposure to similar acid anhydrides increases the risk of respiratory sensitization, chronic bronchitis.
Routes of Exposure: Inhalation, skin contact, eye contact, swallowing
Symptoms: Burning sensation, coughing, shortness of breath, pain on contact, vision loss with severe exposures.
Aquatic Toxicity: Hydrolysis products drop pH, stress aquatic organisms, especially fish and invertebrates. Even small leaks disrupt fragile waterways.
Persistence and Degradability: Pivalic Anhydride converts to pivalic acid in the presence of water, persisting in soil and water until diluted or neutralized.
Bioaccumulation: Low for pivalic acid, but local buildup after spills harms the immediate ecosystem.
Precautions: Prevent runoff into soil or streams at all stages from delivery to waste removal.
Waste Disposal: Neutralize under controlled conditions, collect, and send to chemical waste handling, preferably by qualified services.
Container Disposal: Triple rinse empty containers with inert solvent before recycling or landfilling under hazardous waste codes.
Regulatory Status: Local, state, and federal rules for organics disposal apply, so skip shortcuts—penalties pile up fast for non-compliance.
UN Number: 3265 (Corrosive liquid, acidic, organic)
Packing Group: II
Hazard Class: 8 (Corrosive substances)
Shipping Requirements: Use certified containers, emergency spill control resources, and strict manifest procedures.
Special Requirements: Transport crews should get dedicated chemical handling training. Report all incidents immediately—delays raise investigation and liability risks.
Global Harmonized System (GHS): Meets criteria for corrosive, health hazard, acute aquatic hazard.
Reporting: Facilities using this compound face strict reporting under chemical workplace safety, environmental, and transport laws. Notifications to local health and environmental agencies sometimes fall under state and regional definitions for controlled chemicals.
Worker Protection: Employers take worker protection seriously, as even trace exposure can bring legal, financial, and human costs.
Labeling: Legible, permanent hazard information on all containers, training for staff, and clear emergency plans cement compliance.
