Phosphorus Oxychloride (POCl₃)
Colorless fuming liquid used in phosphate ester, pharmaceutical API and reactive dye synthesis. Also known as Phosphoryl Chloride.
Product Overview
Phosphoryl Chloride — The Versatile Chlorinating Agent
Phosphorus Oxychloride (POCl₃), also called Phosphoryl Chloride, is a colourless fuming liquid with a pungent odour. Its tetrahedral molecular geometry — with one P=O and three P–Cl bonds — makes it a far more selective chlorinating and phosphorylating agent than many alternatives. It is the preferred reagent for chlorinating hydroxyl and amino groups in complex organic molecules, particularly in API synthesis where functional-group selectivity is paramount.
Technical Specifications
Physical & Chemical Properties
All parameters verified by in-house GC before dispatch.
| Chemical Formula | POCl₃ |
|---|---|
| CAS Number | 10025-87-3 |
| UN / Hazard Class | UN 1810 · Class 8 (PG I) |
| Appearance | Colorless fuming liquid |
| Assay (GC) | ≥ 99.5% |
| Molar Mass | 153.32 g/mol |
| Boiling Point | 105.8 °C |
| Freezing Point | 1.2 °C |
| Density | 1.645 g/cm³ at 20 °C |
| Reactivity | Reacts with water → H₃PO₄ + HCl |
Packaging & Supply
Flexible Supply Configurations
UN-approved packaging from carboys to drums to bulk tanker loads to match your plant throughput.
Hazard Warning: POCl₃ is UN 1810, Class 8 Corrosive, PG I. Reacts with water producing phosphoric acid and HCl. Requires dry, ventilated handling with full PPE. Refer to the SDS before any contact.
Industrial Applications
Where POCl₃ Powers Global Chemistry
From crop protection to semiconductor deposition, Phosphoryl Chloride is integral to high-value chemical manufacturing.
Agrochemicals
Starting material for trialkyl phosphate insecticides and organophosphate herbicide synthesis. Key reagent for nematicide and chlorinated phosphate ester production used in soil treatment.
Pharmaceuticals
Selective chlorinating agent for converting hydroxyl and amino groups in API synthesis. Used in production of anti-malarials, antivirals, and nucleoside analogues where functional-group selectivity is critical.
Flame Retardants
Primary feedstock for tris(chloroalkyl) phosphates and halogenated phosphate esters used as flame retardants in polyurethane foam, textiles and electronics with low toxicity profiles.
Reactive Dyes
Intermediate for triazine-based reactive dye synthesis for cellulose fibres. Introduces reactive chlorotriazine groups that form covalent bonds with hydroxyl groups in cotton and viscose.
Semiconductor & Specialty
Used in chemical vapour deposition (CVD) processes for phosphosilicate glass deposition and as a chlorination/dehydration reagent in specialty organic and inorganic synthesis.
Why Source from Us
Darshan Fine Chem Private Limited Quality Promise
Moisture-Free Production
Closed-loop, N₂-blanketed filling ensures zero moisture contact from reactor to sealed drum.
≥99.5% Assay
Every batch GC-verified with full impurity profile, including controlled PCl₃ and free HCl levels.
COA & SDS Included
Batch-specific Certificate of Analysis and GHS-compliant Safety Data Sheet with every shipment.
Export Ready
Strategic Gujarat location for fast access to Mundra and Nhava Sheva ports for global supply.
FAQs
Frequently Asked Questions — Phosphorus Oxychloride
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