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p-Toluic acid/PTA
Product Description
p-Toluic Acid (PTA)
High-Purity 4-Methylbenzoic Acid — Terephthalic Acid / PET Chemistry, PAMBA Pharmaceutical Synthesis & Specialty-Chemical Intermediate
CAS: 99-94-5 EC: 202-803-3 Assay: ≥ 99.0%
p-Toluic acid (PTA, para-toluic acid, 4-methylbenzoic acid, CAS 99-94-5) is a high-purity aromatic monocarboxylic acid and a versatile fine-chemical building block. A key intermediate in the air-oxidation of p-xylene to terephthalic acid (the basis of PET polyester), it is also widely used as a precursor in pharmaceutical synthesis — notably for the antifibrinolytic agent PAMBA — and in dyes, agrochemicals, esters, and specialty chemicals. Royalchem Spain supplies it at ≥ 99.0% purity as white crystalline flakes, delivered from our Valladolid distribution hub by bag or drum with COA and SDS for every batch.
Technical Specifications (COA Data)
| Assay (GC) | ≥ 99.0% |
| Appearance | White crystalline flakes |
| Moisture (KF) | ≤ 0.10% |
| Molecular Weight | 136.15 g/mol |
| Melting Point | ≈ 178–182 °C |
| Boiling Point | ≈ 274–275 °C |
| Density (20 °C) | ≈ 1.06 g/cm³ |
*Regulatory: EINECS-listed (EC 202-803-3); supplied in line with EU REACH requirements; manufactured under ISO 9001. GHS — Warning: harmful if swallowed (H302); causes skin irritation and may cause an allergic skin reaction (H315, H317); causes serious eye irritation (H319); may cause respiratory irritation (H335). Generally not classified as a dangerous good for transport — confirm against the current SDS. Handle with gloves, eye protection, and adequate ventilation. Always refer to the current SDS.
Chemical Structure
Key Properties
• Molecular Formula: C₈H₈O₂
• Molecular Weight: 136.15
• Melting Point: ≈ 178–182 °C
• Boiling Point: ≈ 274–275 °C
• Molecular Weight: 136.15
• Melting Point: ≈ 178–182 °C
• Boiling Point: ≈ 274–275 °C
Main Applications
Terephthalic Acid & PET Chemistry
A central intermediate in the catalytic air-oxidation of p-xylene to terephthalic acid (TPA/PTA) and dimethyl terephthalate — the building blocks of PET polyester used in beverage bottles, food packaging, polyester fibres, and engineering plastics.
Pharmaceutical Intermediate
A versatile benzoic-acid building block for API synthesis — notably the antifibrinolytic agent PAMBA (para-aminomethylbenzoic acid) — and a precursor to p-tolunitrile and substituted benzoic acids for custom pharmaceutical development.
Dyes, Agrochemicals & Esters
An intermediate for azo and specialty dyes, agrochemical actives (crop-protection and herbicide building blocks), and esters such as methyl p-toluate used in fragrances, plasticisers, and specialty-chemical formulations.
Logistics & Packaging
Standard Packaging:
25 kg kraft-paper bags or fiber drums, with 500/1000 kg jumbo bags or custom packaging on request. Distributed by Royalchem Spain from our Valladolid hub. Shelf life 24 months in original sealed packaging.
Storage Conditions:
Store in a cool, dry, well-ventilated area in tightly closed packaging, away from moisture, heat, ignition sources, strong oxidising agents, and strong bases. Keep bags sealed to prevent caking and preserve assay; minimise dust generation during handling.