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Chemical Name: 4-Ethylpyridine
Chemical Formula: C7H9N
Common Uses: Used as an intermediate in pharmaceuticals, specialty chemicals, and sometimes as a flavor or fragrance compound in limited, controlled environments.
Appearance: Oily, colorless to pale yellow liquid with a strong, pungent odor reminiscent of pyridine.
Synonyms: 1-Ethylpyridine-4, Pyridine, 4-ethyl-
CAS Number: 536-78-7
Hazard Classes: Flammable liquid, acute toxicity (oral, dermal, inhalation), skin and eye irritation
Signal Word: Warning
Health Hazards: Irritates respiratory tract and mucous membranes; can cause burning sensation on contact with skin or eyes; ingestion or inhalation brings dizziness, headache, and in severe cases, systemic toxicity.
Environmental Hazards: Harmful to aquatic life with long-lasting effects.
Physical Hazards: Vapors may form explosive mixtures with air. Spilled material poses slip risk.
Main Ingredient: 4-Ethylpyridine
Purity: Typically greater than 95%.
Other Constituents: Trace pyridine derivatives or common solvent impurities from the manufacturing process.
Eye Contact: Immediately rinse eyes with low-pressure water for several minutes. Remove contact lenses if present and easy to do. Do not rub or keep eyes closed; flushing dilutes the chemical. Seek medical attention at earliest sign of persistent discomfort or visual disturbances.
Skin Contact: Remove contaminated clothing. Rinse affected skin under running water using soap if available. Do not delay; even mild contact feels irritating after just a few minutes.
Inhalation: Move to fresh air without delay. Loosen tight clothing. Deep breaths help clear lungs. Watch for dizziness, coughing, or chest tightness; medical help may be necessary if symptoms don’t improve rapidly.
Ingestion: Rinse mouth with water only if person is alert. Do not induce vomiting; pyridine derivatives generally cause more harm returning up. Medical assistance is prudent for quantities larger than a mouthful.
Suitable Extinguishing Media: Use dry chemical powder, foam, or carbon dioxide. Water can spread the liquid but helps cool fire-exposed containers.
Specific Hazards: Vapors may ignite at room temperature; containers under pressure can rupture violently if heated.
Protective Equipment: Firefighters should wear self-contained breathing apparatus and protective clothing. Downwind people must be protected from smoke and toxic fumes—could include nitrogen oxides and carbon monoxide.
Fire Behavior: Dense, irritating, and possibly toxic smoke forms. Runoff may pollute waterways.
Personal Precautions: Wear chemical-resistant gloves, protective eyewear, and avoid inhaling vapor. Work in a well-ventilated area. Entry into spill area without proper gear means risking respiratory distress and skin burns.
Environmental Precautions: Avoid letting chemical enter environment, especially surface and ground waters. Build a dike from absorbent material to trap liquid. Inform authorities if there is a significant release to the environment.
Cleanup Methods: Absorb spill with sand, earth, or compatible inert material. Collect in secure, labeled containers for proper disposal. Never hose directly to drain.
Handling: Work in chemical fume hood or ventilated space. Use tightly closed containers. Prevent inhaling vapors or direct skin contact. Label and segregate from food, drink, or animal feeds.
Storage: Store in original, corrosion-resistant bottles, away from heat, sparks, or other ignition sources. Keep out of sunlight and minimize static discharge by grounding equipment.
Incompatible Materials: Strong oxidizers, acids, and halides can cause violent reactions with pyridine derivatives.
Exposure Limits: No official TLV or OEL listed for 4-ethylpyridine, though limits for pyridine analogs are low—practice high standards of minimization.
Engineering Controls: Use chemical fume hoods, exhaust fans, and prevent accumulation of vapors. Work surfaces should be resistant to spills.
Personal Protective Equipment: Chemical splash goggles for eyes, impermeable gloves (nitrile or butyl rubber works well), lab coat or disposable overalls, and, in case of inadequate ventilation, respirators rated for organic vapors are a must.
Boiling Point: Around 156°C
Melting Point: Slightly below room temperature, usually a liquid under standard lab conditions.
Odor: Sharp, irritating, fishy-smoky odor belonging to many pyridines.
Density: About 0.96 g/cm³
Solubility: Freely soluble in organic solvents, moderately soluble in water.
Vapor Pressure: Enough to create inhalation hazard at room temperature.
Flash Point: Just above room temperature—approximately 47°C.
Chemical Stability: Remains stable in closed containers at room temperature. Decomposition starts with strong heating or contact with acids or oxidizers.
Incompatible Materials: Strong acids, oxidizing agents, halogens. Unexpected reactions may result in hazardous byproducts.
Hazardous Decomposition Products: Nitrogen oxides, carbon monoxide, and a range of toxic organic vapors during fire or decomposition.
Routes of Exposure: Inhalation, ingestion, skin, and eye contact
Acute Effects: Burning oral sensation, headache, dizziness, nausea, and even respiratory distress with prolonged inhalation. Skin contact prompts redness and irritation. Eyes get painfully irritated fast.
Chronic Effects: Prolonged exposure risks liver and kidney function. Pyridine-class compounds sometimes show neurological effects after long exposure, including reversible effects on memory, mood, or coordination.
Cancer Data: No recognized human carcinogenicity for this specific derivative, but close analogs show enough cause for caution.
Toxicity: Can be toxic to aquatic organisms, especially in concentrated spills.
Persistence: While the compound will slowly break down in the environment, it resists rapid biodegradation and lingers in soil and water, stressing aquatic life.
Bioaccumulation: Not strongly bioaccumulative but still persists in water systems for enough time to deserve careful disposal.
Mobility in Soil: Moves readily with water—spills can reach groundwater rapidly if not contained.
Small Amounts: Absorb into inert material and send to hazardous waste disposal facility. Incineration at high temperature in chemical incinerators with afterburners and scrubbers works best for destruction.
Bulk Disposal: Regulated as hazardous waste in most regions. Safe disposal relies on professional hazardous waste handlers.
Do Not: Flush to sewer or natural waterways. Do not burn without specialized permitted equipment.
Proper Shipping Name: 4-Ethylpyridine, chemical, liquid, flammable
Hazard Class: Flammable liquid, generally Class 3 for transportation purposes
Packing Instructions: Select tight-sealing containers that resist corrosion and don’t interact with pyridine derivatives. Every container needs labeling for flammable hazard.
Transport Precautions: Keep away from ignition sources; avoid storing with strong oxidizers or acids during transport.
Chemical Inventory Status: 4-Ethylpyridine sits on several national chemical inventories regulated for use and reporting including TSCA in the United States.
Labeling Requirements: All containers must clearly display hazard symbol for flammability, warning phrases for health and environmental risk.
Workplace Regulation: Local labor safety agencies generally require supplied air in poorly ventilated handling areas along with periodic exposure monitoring.
Environmental Release: Spills over threshold quantity often trigger mandatory notification to local authorities.
