Polyphosphoric Acid (PPA)
Clear viscous liquid (105–118% H₃PO₄ eq.) for pharmaceutical cyclizations & asphalt modification.
Product Overview
The Specialized Reagent for Intramolecular Cyclization
Polyphosphoric Acid (PPA) is a clear, viscous liquid composed of condensed polymeric phosphoric acid species. It is expressed as having a strength of 105–118% H₃PO₄ equivalent (~76–85% P₂O₅ content).
Technical Specifications
Physical & Chemical Properties
Verified by titrimetric analysis and density control.
| CAS Number | 8017-16-1 |
|---|---|
| UN / Hazard Class | UN 3264 · Class 8 (PG III) |
| Appearance | Clear to pale yellow viscous liquid |
| H₃PO₄ Equivalent | 105 – 118% |
| P₂O₅ Equivalent | ~76 – 85% |
| Viscosity | Highly viscous at 25 °C (drops above 60 °C) |
| Solubility | Miscible with water (hydrolyses slowly → H₃PO₄) |
Packaging & Supply
Flexible Supply Configurations
Supplied in heavy-duty HDPE containers and road tankers across India and export markets.
Corrosive Liquid: PPA is UN 3264, Class 8. Highly viscous; handles easily when warmed gently. Always use acid-resistant PPE and ensure dry equipment to prevent exothermic hydrolysis.
Industrial Applications
Where PPA Powers Global Chemistry
Key applications in pharmaceutical heterocycles, asphalt modification, and surfactants.
Pharma Cyclization
Reagent of choice for intramolecular dehydrations and cyclizations forming benzimidazoles, benzothiazoles, indanones, and tetrahydroisoquinolines in API synthesis.
Bitumen Modification
Used as an asphalt additive to enhance high-temperature viscosity and rutting resistance in heavy-traffic highway road construction.
Surfactant Esters
Reacts with alcohols to produce alkyl phosphate esters used as anti-static agents, wetting agents, and emulsifiers in industrial detergents.
Dye Condensation
Serves as a condensation medium and acid catalyst in anthraquinone and phthalocyanine dye and pigment manufacturing.
Beckmann Rearrangement
Catalyzes the conversion of oximes to amides, a critical reaction step in specialty polymer and nylon chemical processing.
Why Source from Us
Darshan Fine Chem Private Limited Quality Promise
Exact 105–118% Grade
Consistently high P₂O₅ concentration ensures maximum cyclization power and batch yield.
Pharma Grade QC
Controlled metal impurity levels for sensitive active pharmaceutical ingredient manufacturing.
COA & SDS Included
Batch Certificate of Analysis and SDS provided with every consignment.
Bulk Delivery
Available in drums and carboys with fast dispatch from Sayakha GIDC, Gujarat.
FAQs
Frequently Asked Questions — Polyphosphoric Acid
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