4-Hydrazinobenzenesulfonic Acid (CAS 98-71-5), commonly known as p-Hydrazinobenzenesulfonic acid, is a white to off-white crystalline powder primarily utilized as a critical diazo intermediate in the manufacturing of azo dyes and pharmaceutical compounds. This Phenylhydrazine-4-sulfonic acid derivative functions as a key coupling agent in p-Sulfophenylhydrazine based synthesis, specifically serving as the primary precursor for Acid Yellow 23 (Tartrazine) and other pyrazolone-based colorants used in the food and textile industries. To support industrial-scale requirements, we provide bulk supply with competitive factory pricing and ensure rigorous quality control through customized specifications alongside standard technical documentation, including MSDS, TDS, COA.
4-Hydrazinobenzenesulfonic Acid CAS 98-71-5
- CAS: 98-71-5
- Synonyms: 4-hydrazylbenzene sulfonic acid/phenylhydrazine-4-sulfonic acid
- Einecs: 202-694-2
- Molecular Formula: C6H8N2O3S
- Grade: Industrial grade 99%
- Package: 200kg iron drum or 50kg plastic drum packing
Product Description
product name: 4-Hydrazinobenzenesulfonic acid
Synonyms: 4-hydrazylbenzene sulfonic acid/phenylhydrazine-4-sulfonic acid
CAS Number: 98-71-5
Formula: C6H8N2O3S
Molecular weight: 188.2
EINECS Number: 202-694-2
Content: 98%
Appearance: light yellow powdery
Packing: 25kg/cardboard drum
Role and use
1. Use pesticide、dye Intermediates
2. Used as Pharmaceutical intermediates, mainly used in the production of celicoxi.
FAQ - Technical & Supply Chain
-
Q:
What is the solubility profile of 4-Hydrazinobenzenesulfonic Acid (CAS 98-71-5)?
A: It has low solubility in cold water (C6H8N2O3S) but dissolves readily in hot water and alkaline solutions (such as sodium hydroxide or ammonia) due to the formation of soluble salts. -
Q:
Is this chemical used in food dye production?
A: Yes, it is the essential raw material for synthesizing Tartrazine (E102), a widely used lemon-yellow food coloring, via condensation with ethyl acetoacetate or similar dicarbonyl compounds.
Documents and Product Support
For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.
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- TDS for key physical and chemical information
- SDS / MSDS for handling, storage, and safety reference
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- Technical communication based on application and specification requirements
Information to Confirm Before Quotation
Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.
- Product name and CAS number
- Application or intended end use
- Required purity, grade, or specification
- Sample quantity, trial order, or bulk demand
- Preferred packing form or net weight
- Destination country or port
- Required documents or compliance expectations
Packaging, Storage, and Handling Notes
Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.
Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.
Sample, Bulk Order and Repeat Supply Support
Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.
For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.
