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Chemical Name: 3-Methyl-2-Pentene
Synonyms: 3-Methylpent-2-ene
Chemical Formula: C6H12
Molecular Weight: 84.16 g/mol
Appearance: Clear, colorless liquid with a slight hydrocarbon odor
Odor: Characteristically petrol-like, slightly sweet
Classification: Flammable liquid, irritant, may form explosive mixtures with air
Hazard Statements: Highly flammable; vapors can catch fire from sources like static, hot surfaces, or open flames. Inhalation causes dizziness, headaches, and respiratory irritation. Eye or skin contact leads to irritation or redness. Attempting to handle this chemical without awareness of its hazards risks both short- and long-term health. Pooled vapors can flow along surfaces to distant ignition sources.
Main Ingredient: 3-Methyl-2-Pentene (CAS: 922-62-3, >95%)
Impurities: Trace amounts of related alkenes and saturated hydrocarbons may be present, depending on synthesis methods and storage conditions.
Purity Impact: Even high-purity samples might introduce trace hazards, especially if degraded or exposed to heat and light for long durations.
Inhalation: Remove the affected individual immediately to fresh air. Keep warm and at rest. Seek medical attention for breathing difficulty. Judgment falters after inhaling high concentrations of hydrocarbon vapors, and delayed symptoms could creep in.
Skin Contact: Wash well with plenty of soap and water. Remove contaminated clothing; prolonged exposure can lead to dermatitis or chemical burns.
Eye Contact: Flush gently with water for 15 minutes. Lifting lids helps. Irritation or blurry vision signals need for medical review because hydrocarbons often linger in mucus tissue.
Ingestion: Do not provoke vomiting. Rinse mouth with water if possible. Transport rapidly to a medical facility, as aspiration into lungs can induce chemical pneumonitis—one of the most severe consequences in organic solvent accidents.
Suitable Extinguishing Media: Dry chemical powder, foam, or carbon dioxide—avoid water jets as they spread the product.
Specific Hazards: Burning releases acrid, toxic fumes such as carbon monoxide and aldehydes. Containers under fire threat risk bursting. Escaping vapors could catch far from the original blaze.
Protective Equipment: Full protective gear, self-contained breathing apparatus (SCBA). Firefighters face intense heat and risk of unidentified reaction products, so vigilance is crucial even after flames subside.
Advice: Cool containers remotely with water spray—don’t approach flame-engulfed tanks.
Personal Protection: Evacuate the spill zone. Use non-sparking, grounded tools. Protective clothing and chemical-resistant gloves minimize direct exposure.
Spill Response: Absorb with inert material such as sand or diatomaceous earth. Shovel into marked drums for disposal. Ventilate area thoroughly.
Environmental Impact: Prevent entry to sewage or watercourses, as spills spread rapidly over water and threaten aquatic life.
Practice: Identify vapor and ignition risks in the environment before clean-up starts.
Handling: Manage only in well-ventilated areas, away from ignition sources. Charge and handle using grounded lines and non-sparking tools. Avoid inhaling vapors or prolonged skin contact. Industrial solvent leaks catch fire too easily to ignore minor drips or careless handling.
Storage: Keep in tightly sealed, clearly labeled containers in a cool, dry, well-ventilated space. Store far from oxidizers, acids, and direct sunlight. Flammable storage cabinets should be locked after work hours. Avoid excessive stacking or overcrowding, which raises spill and fire risk.
Engineering Controls: Local exhaust ventilation and process enclosure control airborne concentrations. Regular checks and maintenance on ventilation systems prevent accidental buildup in confined workspaces.
Personal Protection: Wear chemical splash goggles and chemical-resistant gloves. Fire-retardant coveralls shield from unexpected splashes or spills, and an organic vapor respirator provides additional protection when handling large volumes.
Hygiene Measures: Wash hands thoroughly after handling, remove contaminated clothing immediately, and avoid eating or drinking near work zones. Cross-contamination between workstations magnifies health risks, so good habits prove more important than just ticking off a PPE list.
Physical State: Liquid at room temperature
Boiling Point: Around 80°C
Melting Point: Below -100°C
Flash Point: Below -20°C (closed cup)—this ignition risk ranks among the most serious for similar alkenes
Vapor Pressure: Elevated at room temperature, indicating a propensity to evaporate and pose inhalation hazard
Solubility in Water: Negligible. Merges easily with other hydrocarbons
Odor Threshold: Detectable at low levels; a reliable early warning, though relying only on smell does not guarantee safety given olfactory fatigue
Chemical Stability: Stable under most recommended storage and handling conditions. High temperatures, direct sunlight, or oxidizing agents provoke decomposition.
Reactivity: May react vigorously with strong oxidizers like peroxides or nitric acid. Static discharges can set off vapors.
Decomposition Products: Burning or decomposition spawns hazardous gases like carbon monoxide, carbon dioxide, and possibly acrolein.
Polymerization: No rapid polymerization under normal circumstances, though contamination with acids or heat speeds up unpredictable changes.
Likely Routes of Exposure: Inhalation, skin, eyes, and accidental ingestion all bring hazards. Acute inhalation causes narcotic effects—disorientation, dizziness, sometimes loss of consciousness. Long or repeated exposures increase chance of headache, nausea, or more severe outcomes like central nervous system depression. Skin absorption possible, especially through compromised skin.
Short-Term Symptoms: Irritation to eyes, skin, airways. Nausea and vomiting possible if swallowed.
Long-Term Effects: Effects less well-documented, but repetitive handling without precautions has caused skin disorders and may sensitize some people. No strong evidence yet links it to cancer in humans, though the general rule with volatile hydrocarbons is: less exposure means less risk.
Aquatic Toxicity: Harmful for aquatic life. Spills spread rapidly over surface water, cutting off oxygen and harming fish and other organisms. Low water solubility, but vapor phase returns the chemical to the atmosphere fast, polluting both air and water.
Persistence and Degradability: Not particularly persistent, as sunlight and microbes break down alkenes over days to weeks. Breakdown in soil and water limits long-term accumulation, but does not erase acute risk from accidental releases.
Bioaccumulation: Unlikely, but transient populational impacts in water bodies have been seen with similar chemicals.
Waste Treatment Methods: Incinerate only in permitted chemical waste facilities. Don’t pour into drains, rivers, or public sewers. Solid or absorbent material contaminated by the compound also needs careful bundling for hazardous waste collection. Disposal guidelines shift between locations, but the necessity for licensed handling remains consistent across reputable jurisdictions.
Contaminated Packaging: Triple rinse then send for hazardous material disposal, not recycling streams. Residual fumes matter even after apparent emptying.
UN Number: Assigned for flammable liquids of this class, often subject to international transport restrictions.
Transport Hazards: Marked as Dangerous Goods—flammable symbol, keep away from heat, sparks, and open flames.
Transport Conditions: Ship in tightly sealed, upright containers. Preferable to include secondary containment and clear hazard labeling during bulk or drum transport, since bumpy rides can trigger leaks through unnoticed seals or caps.
Classification: Flammable liquid by global transport and chemical safety standards. Requires labeling consistent with GHS (Globally Harmonized System).
Worker Protection: Safety regulations restrict exposure by mandating controls, training, and record-keeping. Facilities using or storing this substance undergo periodical inspections for compliance. The broader legal climate has grown stricter, especially for airborne hydrocarbon emissions and bulk storage safety.
Environmental Controls: Spills classified as environmental emergencies in many regions, and accidental releases attract penalties. Reporting thresholds are low due to air and water dangers.
Community Right-to-Know: Public access to workplace safety records often includes reporting on storage and use quantities, aiming to keep neighbors informed and protected.
