para-Toluenesulfonic acid
General Product Information
| Article | para-Toluenesulfonic acid |
| Synonyms | 4-Methylbenzene-1-sulfonic acid, 4-Methylbenzenesulfonic acid, Tosylic acid , Tosic acid, PTSA, pTsOH, TsOH |
| CAS No. | 104-15-4 |
| EEG No. | 016-030-00-2 |
| EINECS No. | 203-180-0 |
| IMO | Class 8 (A). |
| Tariff Code | 29041000 |
| UN No. | 2585 |
| VLG/ADR | Class 8, Packing Group III |
Description
Para-Toluenesulfonic Acid (abbreviated as PTSA or p-TSA) is an aromatic sulfonic acid widely used in industrial chemistry. It is known for its strong acidic properties and its role as an efficient catalyst in numerous organic synthesis processes. Due to its solid shape, PTSA is easy to handle, dose and transport compared to liquid acids. It is widely used in the plastics, paint and textile industries, among others.
Characteristics
- Odor: –
- Hygroscopic: Yes.
- Color: White to light pink.
- Grade: Technical.
- Solubility: Highly soluble in water, ethanol, methanol and other polar solvents.
- Shape: crystalline solid.
Physical & Chemical Properties
| Chemical Structure | C7H8O3S |
| Molar Weight | 172.20 g/mol |
| Melting Point | Approx. 103 °C. |
| Boiling Point | – |
| Density | 1.24 g/cm³ |
| Refractive Index | – |
| pH | – |
Applications
Para-Toluenesulfonic acid is applied in various ways, for instance:
1. Chemical Industry
As a catalyst at esterifications, condensations and other reactions in which acids are required.
2. Cleaning Products Industry
In industrial cleaning formulations as an acid component.
3. Paint & Coatings Industry
Accelerates the curing process of coatings and thermosetting systems.
4. Plastics Industry
As a curing agent and catalyst at the production of epoxy, phenolic and polyester resins.
5. Textile Industry
In chemical processes such as dyeing and finishing.
Interessing Links
- CAS Common Chemistry – p-Toluenesulfonic acid
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- PubChem – p-Toluenesulfonic acid – Chemical information by the National Library of Medicine of the National Center for Biotechnology Information (NIH-NCBI).
- Wikipedia – p-Toluenesulfonic acid