Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.
Basic Information
- CAS Number: 636-73-7
- Molecular Formula: C?H?NO?S
- Molecular Weight: 159.16 g/mol
- Synonyms: Pyridine-3-sulfonic acid; 3-Sulfopyridine; P3SA; Pyridine-3-sulphonic acid
- Classification: Organic intermediate, pharmaceutical intermediate, chemical reagent, electroplating additive, heterocyclic building block
- EINECS Number: 211-265-9
- MDL Number: MFCD00006381
- BRN Number: 120822
Physical & Chemical Properties
- Appearance: White to off-white crystalline powder or lumps; odorless; no visible impurities; may appear as pale yellow crystals under improper storage conditions.
- Melting Point: >300°C (lit.); some sources report 339°C, 360°C or 365-370°C; high melting point, stable at room temperature, decomposes before boiling.
- Boiling Point: Not determined (decomposes prior to boiling).
- Solubility: Soluble in water (almost clear solution); slightly soluble in ethanol; insoluble in ether, benzene, trichloroethylene and aliphatic hydrocarbons.
- Stability: Stable under normal storage conditions (15–25°C); hygroscopic and light-sensitive; incompatible with strong oxidants, strong bases and metals; avoid moisture, direct sunlight and high temperature; recommended to be stored in an inert gas-filled environment.
- Key Parameters: Density 1.713 g/cm3 (25°C); Refractive Index 1.548 (estimate); pKa -2.30±0.18 (Predicted); Maximum Wavelength (λmax) 262nm (EtOH aq.)(lit.); Water Content ≤1.0% (w/w); Purity ≥98.0% (titration) or ≥97.0% (NMR).
Uses
3-Pyridinesulfonic acid (CAS: 636-73-7) is a versatile heterocyclic sulfonic acid compound with wide applications in organic synthesis, pharmaceutical manufacturing, electroplating industry, and chemical research. As a key organic building block, it is widely used in the synthesis of various pharmaceutical and chemical intermediates, such as silver 3-pyridinesulfonate and 3-pyridinesulfonyl chloride. In the electroplating industry, it serves as a brightening agent and additive for nickel, copper, and zinc plating, effectively improving the uniformity and brightness of the coating. It is also employed as a catalyst and analytical reagent in chemical research, and can be used as a raw material for organic synthesis, meeting high-purity standards for laboratory and industrial applications. Additionally, it is involved in the preparation of metal sulfonate complexes and plays an important role in the synthesis of functional materials.
Packaging & Storage
Packaging: Laboratory grade: 5g/10g/25g amber glass bottles (sealed with Teflon gaskets) to prevent light and moisture; Industrial grade: 25kg/50kg corrosion-resistant HDPE plastic drums or fiber drums, labeled with "corrosive", "hygroscopic", "light-sensitive" and GHS hazard information (including H314: Causes severe skin burns and eye damage), and marked with product name, CAS number, purity, storage conditions and UN transportation information. Storage: Store in a cool, dry, well-ventilated warehouse at room temperature (15–25°C); keep tightly sealed, protected from moisture, light and air; avoid contact with strong oxidants, strong bases and metals; it is recommended to store in a dark place and lock the storage area; shelf life is 12 months under specified storage conditions. Keep away from fire, heat sources and direct sunlight during storage and transportation. Wear chemical-resistant gloves, goggles, face shields and protective clothing during operation; use in a fume hood to avoid inhalation of dust or contact with skin and eyes; do not inhale dust/mist; wash skin thoroughly after handling; if it comes into contact with the skin, immediately remove all contaminated clothing and rinse with plenty of water for at least 15 minutes; if accidentally ingested, rinse mouth and do not induce vomiting; if splashed into eyes, rinse carefully with water for several minutes (remove contact lenses if easily removable) and continue rinsing, then seek medical attention immediately; properly dispose of residual contents and containers as industrial waste.
