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Specifications
| APPEARANCE: | WHITE POWDER, CRYSTALLINE |
| Residue on ignition: | 32–36% |
| DRY WEIGHT LOSSES: | 0.5%MAX |
| Assay(T): | 95.0% min |
Applications
1. Pharmaceutical Intermediate
Used in the synthesis of active pharmaceutical ingredients (APIs) and drug salts, especially where water solubility or controlled ionization is required.
Plays a role in improving bioavailability and formulation stability of various drugs.
2. Dye and Pigment Industry
Serves as a dye intermediate, particularly in the production of sulfonated azo dyes, due to the presence of the sulfonic group.
Its potassium salt form ensures good dispersion and solubility in aqueous dye baths or printing inks.
3. Analytical Chemistry
Used as a buffer component or reagent in chemical analysis where mild acidity and good ionic conductivity are beneficial.
May assist in the stabilization of pH-sensitive systems.
4. Polymer and Resin Modification
Acts as a functional additive to introduce sulfonic acid functionality into polymers or resins, enhancing hydrophilicity, adhesion, and ion-exchange capacity.
5. Electrolyte or Conductive Medium
Potentially applicable in aqueous electrolyte formulations, especially where stability and ionic transport are critical, such as in batteries or membrane systems.
Benefits
1. Excellent Water Solubility
Due to its sulfonate and potassium salt nature, it dissolves easily in water, making it ideal for water-based formulations and reactions.
2. Chemical Stability
Stable under typical storage and usage conditions, including in acidic and slightly basic environments.
3. Versatility
Combines acidic functional behavior (sulfonate group) with salt-form compatibility, allowing use across multiple sectors: pharmaceutical, dye, and materials science.
4. Non-Volatile and Safe
Low vapor pressure and low reactivity make it easier to handle compared to free acids or more volatile benzoate derivatives.
Conclusion
Monopotassium 4-sulfobenzoate (CAS 5399-63-3) is a multifunctional, water-soluble organic salt with a wide range of applications, particularly in the pharmaceutical, dye, polymer, and analytical chemistry fields. Its combination of a sulfonate group and a potassium cation offers excellent aqueous compatibility, ionic conductivity, and chemical stability. Whether used as a synthetic intermediate, dispersing agent, or functional additive, it delivers both performance and safety advantages, making it a valuable component in modern industrial and laboratory settings.
