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Name: 3-Chloro-1-butene
Chemical Formula: C4H7Cl
CAS: 109-67-1
Physical State: Colorless liquid, sometimes seen with a faint sweet odor
Uses: This chemical often finds a purpose in specialty chemical synthesis and laboratory-scale reactions. Not something that pops up in everyday life, yet people involved with manufacturing or research facilities work around it more than many realize.
Main Hazards: Flammable liquid and vapor, irritating to eyes, skin, and respiratory tract
Pictograms: Flame, Exclamation Mark
Route of Entry: Inhalation, skin absorption, ingestion
Acute Effects: Breathing vapor can irritate airways, sometimes causing coughing or dizziness. Direct contact with skin or eyes leads to reddening or burning.
Chronic Effects: Prolonged exposure risks not just irritation but also impact on the central nervous system, based on reports from chemical workers and available toxicity studies.
Flammability: High, with vapors heavier than air. Risk feels real, especially in enclosed workshop spaces.
Chemical: 3-Chloro-1-butene
Concentration: Usually marketed at 98% or higher
Impurities: Trace amounts of isomeric butenes or chlorinated byproducts as a result of synthesis
Common Additives: No stabilizers in most laboratory stocks, which increases its tendency to polymerize or react unexpectedly without warning.
Inhalation: Move to fresh air immediately, loosen clothing around neck and chest
Skin Contact: Remove contaminated clothes, wash skin thoroughly with soap and water
Eye Contact: Rinse eyes under running water for a prolonged time, keeping eyelids open
Ingestion: Rinse mouth, seek prompt medical attention—inducing vomiting doesn't help
Medical Attention: Any breathing difficulties or burns call for urgent evaluation, as symptoms can sneak up long after first exposure.
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, CO2
Unsuitable Media: Water jets tend to spread burning liquid
Hazardous Combustion Products: Hydrogen chloride fumes, carbon monoxide, carbon dioxide
Protective Equipment: Full protective gear and self-contained breathing apparatus
Special Measures: Containers in the vicinity require rapid cooling with water spray. Vapor can travel, finding ignition sources far from spill site.
Personal Precautions: Keep unprotected personnel away, ventilate area well
Environmental Measures: Stop leakage if safe, avoid entry into watercourses and sewers
Spill Cleanup: Use inert absorbents for small spills. Shovel up contaminated material into chemical waste drums.
Disposal: Transfer for licensed chemical incineration. The smell tends to linger unless clean-up is thorough.
Precautions: Keep away from heat, open flames, and sparks
Safe Handling: Wear gloves and goggles, work in fume hood
Storage Requirements: Store in tightly closed containers, cool, well-ventilated place. Keep segregated from oxidizers and strong acids.
Other Considerations: Prevent static charges by grounding containers, especially important for scale-up operations.
Workplace Control: Local exhaust ventilation and good general room ventilation
Personal Protection: Chemical spill gloves, goggles or face shield, long sleeves, flame-resistant lab coat
Respiratory Protection: Air-purifying respirator for high-vapor situations, especially during transfers and spills
Hygiene: Wash hands thoroughly after handling, don’t eat or drink in work areas.
Appearance: Colorless to pale liquid
Odor: Sweet, somewhat sharp
Boiling Point: About 90°C
Melting Point: Below -100°C
Vapor Pressure: Moderate at room temperature, can build up quickly in closed spaces
Solubility: Not very soluble in water, mixes well with organic solvents
Density: Slightly heavier than water
Flash Point: Lab records put it near -10°C, so it catches fire easily.
Stability: Unstable if stored near heat, light, or incompatible materials
Polymerization: May occur in presence of strong acids or heat, sometimes violently
Incompatible With: Oxidizing agents, strong bases, strong acids
Hazardous Reactions: Vapor can react dangerously during improper disposal or transfer
Decomposition Products: Hydrogen chloride, carbon monoxide, other toxic gases possible under fire.
Acute Toxicity: Breathing concentrated vapor can cause headache, dizziness, drowsiness
Skin: Causes local irritation, possible redness and blistering
Eyes: Splashes cause marked pain and tearing, corneal injury possible
Long-Term Risks: Animal studies point to organ toxicity in liver and kidneys after sustained exposure. Occupational exposure requires monitoring because the compound affects more than just immediate tissue it touches.
Ecotoxicity: Harmful to aquatic life; chemical spills have downstream impact
Mobility: Tends to evaporate readily, but can persist in soil if spilled
Persistence and Degradability: Limited natural breakdown in water, relies on sunlight and bacteria
Bioaccumulation: Data scant, though organochlorines have a track record of moving up the food chain.
Waste Treatment: Incineration by licensed professionals
Container Disposal: Triple rinse, then puncture and send for chemical waste
Regulatory Compliance: Must not dump in drains, open land, or sewers; improper disposal harms water and soil far beyond the initial spill site.
Worker Safety: Only trained staff permitted to handle bulk or waste.
UN Number: Classified as a hazardous material for road, air, and sea
Shipping Class: Flammable liquid
Packing Group: II, indicating moderate danger
Marking Requirements: Flammable liquid labels on all containers; leakproof packaging required by law
In Transit: Vehicles carrying need to stick to strict route and storage rules, and drivers often receive training before handling any load with chlorinated liquids.
Workplace Limits: Exposure limits set in industrial hygiene codes for many countries, though not every country lists it separately
Labeling: Flammable, irritant warning symbols mandatory
Chemical Inventories: Registered with regional and international chemical authorities
User Responsibility: Employers hold clear responsibilities for training, monitoring, and incident prevention.
Sustainability: Growing global scrutiny means safer substitutes and greener processes get attention in R&D circles. Those in charge need to keep records of every transaction and disposal, as enforcement on hazardous chemicals grows tighter with each passing law.
