Product name: p‑Toluenesulfonic Acid Monohydrate
Synonyms: PTSA Monohydrate, Tosylic acid monohydrate, 4‑Methylbenzenesulfonic acid monohydrate
CAS No: 6192‑52‑5
EC No: 203‑180‑0
Molecular Formula: CH3C6H4SO3H or C7H8O3S.H2O
Molecular Weight: 190.22 g/mol
UN‑No: UN 2585
Hazard Class: 8 (Corrosive solid), Packing Group III
Note: This TDS covers four commercial grades: Technical Grade, Pharma Grade, Fine‑Purified Grade, ACS/Reagent Grade. Assay is calculated on monohydrate basis, not anhydrous base. Distinguish from anhydrous p‑Toluenesulfonic acid CAS 104‑15‑4. p-Toluenesulfonic acid PTSA divides into PTSA monohydrate CAS 6192-52-5 and PTSA anhydrous CAS 104-15-4.
1. General Physical‑Chemical Properties (All Grades)
Density 1.24 g/cm³ @20 ℃
Boiling Point 140 ℃ @20 mmHg (decomposition)
Flash Point (closed cup) 180 ℃
Solubility in water Highly soluble (~750 g/L @20 ℃)
Solubility in organic solvent Soluble in ethanol, ether; slightly soluble in toluene, benzene
pH (1 % aqueous solution) ~1.0, strongly acidic
Stability Hygroscopic / deliquescent; absorbs moisture from air. Avoid strong bases, oxidizing agents and active metals.
2. Multi‑Grade Specifications Table
| Test Item | Technical Grade | Pharma Grade | Fine‑Purified Grade | ACS / Reagent Grade | Test Condition |
|---|---|---|---|---|---|
| Appearance | White deliquescent crystalline powder / flakes | White deliquescent crystalline powder / flakes | White deliquescent crystalline powder / flakes | White crystalline powder | Visual @25 ℃ |
| Assay (as C7H8O3S⋅H2O) | 93.0‑95.0 % | 95.0‑97.0 % | ≥98.5 % | ≥98.5‑99.0 % | Acid‑base titration |
| Free Sulfuric Acid (max) | 3.0 % | 1.0 % | 0.5 % | 0.3 % | Titration |
| Water of Crystallization | 9.0‑12.0 % | 9.0‑12.0 % | 9.5‑11.5 % | 9.5‑11.0 % | Karl‑Fischer |
| Ash / Residue on Ignition (max) | 0.20 % | 0.15 % | 0.10 % | 0.05 % | Gravimetric |
| Iron (Fe, max, ppm) | 50 ppm | 30 ppm | 20 ppm | 10 ppm | AAS |
| Melting Point | 102‑106 ℃ | 102‑106 ℃ | 103‑106 ℃ | 103‑106 ℃ | Capillary method |
3. Grade Typical Applications
Technical Grade: Curing accelerator for amino‑alkyd baking paint, general esterification catalyst, resin curing agent, electroplating auxiliary, industrial cleaning agent. Bulk export commodity.
Pharma Grade: Intermediate synthesis for pharmaceuticals and agrochemicals, medium‑fine organic synthesis with moderate impurity requirements.
Fine‑Purified Grade: High‑end organic synthesis, acetalization, alkylation, high‑quality resin curing; preferred export grade for fine chemical customers.
ACS / Reagent Grade: Laboratory analytical reagent and research synthesis; not for large‑scale industrial bulk supply.Important commercial reminder: Always specify monohydrate (CAS 6192‑52‑5) on contract, invoice and COA, and clearly state assay calculation basis (monohydrate vs anhydrous), to avoid commercial dispute.
4. Storage & Shelf‑Life
Storage condition: Store in tightly closed container, cool, dry and well‑ventilated warehouse. Temperature: 15‑25 ℃.
Strictly prevent moisture absorption. Keep apart from alkalis, oxidants and metal materials.
Shelf‑life: 24 months under un‑opened original sealed package.
Standard export packing: 25 kg woven bag with inner PE liner; 25 kg plastic drum.
5. Handling & Safety Notes
Corrosive solid; may cause severe burns to skin, eyes and respiratory tract.
Avoid dust inhalation. Wear chemical goggles, acid‑resistant gloves and protective clothing during operation.
In case of contact with skin or eyes, rinse thoroughly with plenty of running water for at least 15 minutes and seek medical advice.
Keep package well‑sealed against deliquescence.
For full hazard classification, transport regulation and waste disposal information, please refer to complete SDS document.
Disclaimer: All above data are typical laboratory reference values only, not binding contractual specifications. End‑users shall verify suitability for their own process conditions before application.
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