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Chemical Name: N-Phenylacetamide
Common Name: Acetanilide
Chemical Formula: C8H9NO
Appearance: White or slightly off-white crystalline solid
Odor: Slightly aromatic
Uses: Traditionally used in pharmaceutical synthesis, photographic chemicals, and formerly as a fever reducer
Main risks: Can cause harmful effects to body if inhaled or ingested, and may irritate skin and eyes upon contact. High dust concentrations cause throat and respiratory tract irritation. Toxicity concerns have driven replacement in many applications.
Chronic exposure: Linked to cyanosis and liver or kidney issues in rare cases with prolonged contact. Possible risk of allergic responses, especially with repeated exposure.
Warning symbols: Skin irritant; avoid unprotected handling. Occupational health agencies recommend robust exposure controls in workplaces using large quantities.
Active Ingredient: N-Phenylacetamide (acetanilide) >99% purity in most lab-grade supplies.
Impurities: Minute traces of related aromatic amides depending on synthesis route, none present in significant amounts for most commercial grades.
Eye Contact: Rinse affected eyes gently with water for several minutes, remove contact lenses if present, seek medical advice if irritation persists.
Skin Contact: Wash exposed skin thoroughly with soap and water, remove contaminated clothing, pay attention to persistent or spreading irritation.
Inhalation: Move affected person to fresh air, keep at rest, seek evaluation if symptoms such as dizziness, coughing, or shortness of breath occur.
Ingestion: Seek medical help immediately, do not induce vomiting unless instructed by healthcare provider, rinse mouth with water to remove compound residue.
Suitable Extinguishing Media: Use dry chemical, foam, or CO2 for small fires; water spray for large quantities.
Hazards: Combustion generates nitrogen oxides and carbon oxides, both highly irritant if inhaled. Solid itself doesn’t ignite easily, but large dust clouds present an explosion risk if ignition sources are present.
Protective Equipment: Firefighters should use self-contained breathing apparatus, stay upwind, avoid inhaling smoke and decomposition products.
Personal Protection: Ventilate affected area, wear gloves and goggles suitable for powders, avoid raising dust. Responders handle spills with protective clothing covering skin completely.
Environmental Precautions: Prevent runoff into drains or waterways. Sweep up carefully, using wet methods to reduce airborne dust and transfer to secure container for safe disposal.
Handling: Work in well-ventilated space, use tools to avoid skin or eye contact, minimize dust generation, clean work areas to control residual contamination.
Storage: Store in tightly closed containers, keep away from heat and ignition sources, separate from strong oxidizers. Choose cool, dry, ventilated locations where humidity won’t trigger decomposition or clumping.
Engineering Controls: Use fume hoods and filtered ventilation when handling powders, apply dust control protocols in workplaces dealing with large batches.
Personal Protection: Gloves, lab coats, and splash-resistant eye protection reduce direct exposure. Where dust may become airborne, certified particulate respirators offer extra safety. Washing facilities near handling areas limit accidental ingestion or skin contamination.
Molecular Weight: 135.16 g/mol
Melting Point: Ranges from 113°C to 116°C
Boiling Point: Sits near 304°C under atmospheric pressure
Solubility: Only slightly soluble in cold water, much more so in hot water and most organic solvents
Vapor Pressure: Very low at room temperature, limiting inhalation risk under typical handling conditions
Stability: Stable under normal storage and handling conditions, not sensitive to light or minor temperature fluctuations
Hazardous Reactions: Reacts with strong acids, bases, and oxidizing agents to form potentially noxious byproducts, avoid mixing with nitric acid or other strong chemicals
Decomposition: Breakdown during overheating releases acetic acid, aniline, and nitrogen oxides—all toxic upon inhalation
Routes of Entry: Skin absorption, inhalation of dust, ingestion
Acute Effects: High doses may cause headache, nausea, cyanosis (bluish skin), and in rare cases liver or kidney impact
Chronic Effects: Extended contact has led to allergic skin rash or disruptions in blood oxygen in case studies involving industrial workers
Special Populations: Individuals with pre-existing blood or liver conditions face higher risk with exposure
Aquatic Toxicity: Low solubility limits immediate risk to waterways, but persistence in sediment or soil contributes to longer-term accumulation
Degradation: Breaks down gradually under environmental conditions, sunlight speeds up the process, but small molecules persist in soil
Bioaccumulation: Not expected to build up significantly in animal tissue, but environmental monitoring of discharge areas stays important
Disposal: Treat all waste as hazardous, incinerate with professional controls, avoid landfill unless permitted by local regulations, never flush into water systems.
Empty Containers: Triple-rinse and render containers unusable; keep from reuse to prevent accidental exposure.
Spill Cleanup: Collect using wet cleaning, label bags for hazardous material processing, avoid sweeping powder dry.
Packaging: Use sealed, labeled containers that prevent leaks and dust emissions. Small quantities in research labs rarely meet hazardous material thresholds, but industrial bulk shipping often demands extra containment measures.
In Transit: Secure products in well-ventilated transport, away from incompatible chemicals, limit direct exposure to heat.
Labeling: Match local and international transport labeling standards for laboratory chemicals, including hazard markings.
Occupational Limits: Some jurisdictions establish workplace exposure limits based on known toxicological risks. Regular reviews of these benchmarks help companies stay ahead of regulatory changes.
Compliance Frameworks: Multiple countries request reporting for large-quantity use, signaling rising concern about bulk spills and environmental releases.
Prohibition and Substitution: Shift away from medical use due to discovery of safer alternatives, part of broader push for chemicals with minimal health impacts.
