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Chemical Name: Purified Terephthalic Acid
Common Uses: Production of polyester resins and fibers, packaging, films, coating materials
Form: White crystalline powder with no strong odor
Common Synonyms: Benzenedicarboxylic Acid, PTA
CAS Number: 100-21-0
Industry Settings: Seen in chemical plants, textile production sites, and plastics manufacturing
Recognizability: Tends to cake into lumps; can cause white, dusty deposits in storage bins and along conveyors
Immediate Concerns: Misidentification in bulk storage can lead to accidental exposure and process errors
Immediate Concerns: Causes mechanical irritation to eyes, skin, and respiratory tract, especially as airborne dust
Explosion Risk: Dust can form explosive mixtures with air in enclosed areas, especially inside processing equipment
Chronic Exposure: Repeated handling can sometimes cause dermatitis or exacerbate existing skin conditions
Flaming Temperature: Burns above 400°C, creating irritating fumes
Acute Reactions: Eye redness, coughing, mild throat irritation on direct contact
Flammability: Sits in the "combustible dust" category by workplace safety standards
Main Ingredient: Purified terephthalic acid, usually >99% by weight
Trace Impurities: Sometimes contains a small amount of 4-carboxybenzaldehyde or benzoic acid, but not enough to push separate health risks
Allergens or Sensitizers: No established issues according to regulatory agencies
Other Additions: No intentional additives
Eye Contact: Rinse cautiously with water for several minutes; remove contact lenses if present
Skin Contact: Wash with mild soap and water; remove contaminated clothing
Inhalation: Move to fresh air and seek medical advice if coughing or discomfort persists
Ingestion: Rinse mouth thoroughly with water; unlikely to cause problems in small amounts but always seek professional guidance
Medical Advice: Extra attention for people with asthma or reactive airways if exposed to dust clouds
Suitable Extinguishing Media: Use water spray, dry chemical, or CO2 for localized fire
Special Hazards: Dust or fine powder may pose explosion risk; heated product emits irritating or toxic fumes
Protective Equipment: Wear self-contained breathing apparatus and full protective clothing in fire environments
Evacuation: Large fires in confined spaces require prompt evacuation and containment
Personal Precautions: Limit dust generation; wear protective gloves, goggles, and dust mask
Environmental Precautions: Prevent bulk discharge into sewers or surface water since large accumulations change water pH and harm aquatic life
Containment: Dampen spilled powder to prevent dust dispersal; sweep or vacuum for collection
Clean-up Methods: Use tools that do not generate sparks; ventilate the space well and dispose of waste according to local rules
Safe Handling: Use in areas with local exhaust or dust extraction; minimize chute heights to limit dust clouds
Storage Requirements: Store in cool, dry conditions away from oxidizers; bins should withstand possible pressure from caking or bridging
Contact Materials: Compatible with most metals, but trays or hoppers may corrode slowly if regularly wet
Sensitive Conditions: Avoid heat sources, open flames, and static discharge sites
Workplace Limits: ACGIH sets a threshold limit value for nuisance particulates: 10 mg/m³ (inhalable), 3 mg/m³ (respirable)
Ventilation: Use dust extraction or local exhaust ventilation when refilling or transferring between bins
Personal Protective Equipment: Goggles, chemical-resistant gloves, NIOSH-approved dust mask, protective outer clothing
Hygiene Practices: Wash thoroughly after handling; avoid eating, drinking, or smoking in work areas
Special Cases: Supervisors should check for leaks or blockages, especially after refilling storage silos
Appearance: White crystalline powder
Odor: Faintly aromatic, usually undetectable
Melting Point: Around 427°C
Bulk Density: Typically 0.8 g/cm³
Solubility: Insoluble in water, slightly soluble in alcohols or strong bases
Vapor Pressure: Negligible at room temperature
Reactivity: Stable unless overheated or mixed with strong oxidizing agents
Electrical Sensitivity: Dust clouds can develop static charges, especially in dry climates
Chemical Stability: Stable under ordinary conditions; caking may occur under high humidity
Incompatible Materials: Strong oxidizers, alkalis, and acids reduce quality or cause rapid decomposition
Hazardous Reactions: No dangerous polymerization, but exposure to high heat generates carbon monoxide and irritating organic vapors
Decomposition Products: Mainly carbon oxides
Safe Practices: Regular cleaning of handling equipment cuts down on dust build-up and reduces fire risk
Acute Toxicity: Low by oral and dermal routes; exposure mainly causes irritation
Routes of Exposure: Dust inhalation is the usual path; eye and skin contact can cause redness or rash
Chronic Effects: Long-term workplace exposure does not seem to cause cancer or organ damage under current regulations
Carcinogenicity: Recognized as non-carcinogenic by international authorities like IARC
Allergic Reactions: Sensitization is rare
Worker Health Reports: Incidents usually relate to dust not being controlled; keeping airborne levels low cuts down symptoms dramatically
Environmental Impact: Large spills increase acidity in water bodies and may cause stress to aquatic life
Mobility: Material tends to stay in soil near the spill location instead of leaching quickly
Persistence and Degradability: Slowly breaks down in the environment; strong sunlight or microbes help but full breakdown takes time
Bioaccumulation: Not known to build up in fish or wildlife
Release Pathways: Usually enters environment from plant runoff or accidental discharge
Waste Disposal: Collect unused or spilled PTA in sealed, labeled containers; send to licensed chemical disposal facility
Incineration Suitability: Can be burned in industrial incinerators; avoid open burning to prevent toxic fume release
Sewer Disposal: Local authorities often prohibit direct dumping into sewage systems
Packaging Disposal: Empty bags or drums often retain powder and need triple rinsing before recycling or disposal
Mode of Transport: Carried by truck, rail, and bulk containers designed for powders
Packaging: Thick woven sacks (1-ton capacity) or steel bins withstand rough handling
Special Handling Concerns: Containers need clean, dry storage to limit clumping and static electricity
Classification: Not regulated as a hazardous material unless transported as dust in bulk
Spill Management: Emergency teams prepare for airborne dust or slip hazards at transfer points
Workplace Regulations: Occupational dust exposure rules apply widely; regular air quality checks needed in production zones
Environmental Laws: Discharge to air, soil, or water usually faces municipal permit requirements
Import / Export Limits: Some countries classify PTA as a controlled substance due to environmental rules
Labelling: Warning labels for eye, skin, and inhalation hazards are standard across supply chains
Industry Guidance: Chemical trade groups supply best practices for handling and first aid, and regulators provide clear enforcement protocols
