Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Product Profile
- Full IUPAC Name: 4-methylbenzenesulfonic acid
- Aliases: PTSA, para-Toluenesulfonic acid
- CAS Number: 104-15-4
- EINECS: 203-185-8
- Molecular Formula: C7H8O3S
- Molecular Weight: 172.20
- Chemical Classification: Organic strong acid catalyst, esterification dehydrating agent, resin curing agent
- Core Advantages
Stable non-volatile organic strong acid, higher catalytic efficiency than inorganic sulfuric acid, low carbonization side reaction, easy separation post-reaction. Widely applied as catalyst for esterification, acetalization, alkylation, resin synthesis, paint curing and pharmaceutical intermediate synthesis; available in anhydrous and monohydrate grades.
2. Physical & Chemical Properties
2.1 Physical Index
- Appearance: White off-white crystalline solid
- Odor: Slight aromatic sour odor
- Solubility: Freely soluble in water, ethanol, methanol, acetone; slightly soluble in benzene; insoluble in aliphatic alkanes
- Melting Point (anhydrous): 106–108 °C
- Hygroscopy: Strongly hygroscopic, easily absorbs water to form monohydrate crystal
- Corrosivity: Corrosive to metal, irritant to skin and mucosa
2.2 Chemical Properties
- Strong organic sulfonic acid: Complete dissociation in water, strong catalytic proton donor
- Catalytic performance: Promotes esterification, dehydration, ring-opening polymerization without oxidizing carbon chain
- Salt-forming reaction: Reacts with alkali, amine, metal oxide to generate p-toluenesulfonate salts
- Thermal stability: Stable below 180°C; above 200°C decomposes to release sulfur dioxide
- Photostability: Slightly yellow under long-term strong light exposure
- Compatibility: Compatible with most polar organic solvents; incompatible with strong oxidants, active metal powders, alkaline raw materials
3. Main Application Fields
3.1 Organic Synthesis Catalyst (Core Usage)
Esterification, transesterification, acetal/ketal formation catalyst for flavors, fine chemicals and pharmaceutical intermediates; replaces concentrated sulfuric acid to reduce side impurities.
3.2 Coating & Resin Industry
Curing accelerator for amino resin, epoxy resin, powder coating, baking varnish; shortens curing temperature and time.
3.3 Chemical Auxiliary
Stabilizer and polymerization catalyst for plasticizer, textile printing and dyeing auxiliary, cleaning agent additive.
3.4 Electroplating & Electronic Chemicals
pH adjuster and brightener auxiliary in electroplating bath system.
4. Quality Specification Table
| Test Item | Standard Index |
| CAS No. | 104-15-4 |
| Molecular Formula | C7H8O3S |
| Molecular Weight | 172.20 |
| Appearance | White crystalline solid |
| PTSA Purity | Anhydrous ≥98.0%; Monohydrate ≥95.0% |
| Free Sulfuric Acid | ≤0.50% |
| Water Content | Anhydrous ≤0.5%; Monohydrate 11–13% |
| Color (APHA) | ≤50 |
| Bulk Package | 25kg PE lined fiber drum |
| Sample Package | 1kg / 5kg sealed plastic bucket |
| Storage Requirements | Hermetic dry warehouse ≤25℃; isolate humid air, alkaline substances and metal products |
| Transportation Rule | Corrosive organic acid; sealed acid-resistant packaging required during transit |
| Shelf Life | 18 months under intact sealed packaging |
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