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Sulphonation ProductsCAS 121-57-3
Sulphanilic Acid
Sulphanilic Acid
Molecular Formula
C₆H₇NO₃S
Molecular Weight
173.19 g/mol
Appearance
White to light grey crystalline powder
CAS Number
121-57-3
Synonyms:Para Amino Benzene Sulphonic Acid4-Aminobenzenesulphonic acidp-Anilinesulphonic acid
Specifications
| Parameter | Specification |
|---|---|
| Appearance | White to light grey crystalline powder |
| Purity | Min. 99.0% |
| Free Sulphuric Acid | Max. 0.5% |
| Moisture | Max. 0.5% |
| Molecular Formula | C₆H₇NO₃S |
| Molecular Weight | 173.19 g/mol |
Quality & Testing Methods
Diazotisation Titration
Sample dissolved in HCl, titrated with 0.1N NaNO₂, endpoint by starch-iodide paper
Acid-Base Titration
Free acid content — 0.1N NaOH, phenolphthalein indicator
Karl Fischer Titration
Moisture determination per ASTM E203
Applications
Azo dye synthesis
Food colour intermediates (FD&C Yellow No. 5 chain)
Pharmaceutical intermediates (sulfa drugs)
Direct dye manufacturing
Packaging
- 25 kg HDPE bags
- 50 kg HDPE bags
- Jumbo bags (500/1000 kg)
Labelling: GHS/REACH compliant labelling. Export packaging available.
Incoterms: FOB Dahej/Nhava Sheva, CIF, CFR available.
Shipping
- Export to EU, USA, South-East Asia, Middle East, Africa
- GHS-compliant Safety Data Sheets (SDS) provided
- UN dangerous goods classification as applicable
- COA (Certificate of Analysis) with every shipment
Safety Information
Signal Word
Warning
Hazard Classification
Irritant (Skin/Eye)
GHS Pictograms
GHS07 – Exclamation Mark
Storage Conditions
Store in cool, dry, well-ventilated area.
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