Ortho Chloro Para Nitro Aniline
A high-purity chloro-nitro-substituted aniline, supplied as OCPNA, used as an azoic diazo component base across the pigment and disperse dye industries.
What is Ortho Chloro Para Nitro Aniline?
Ortho Chloro Para Nitro Aniline, abbreviated OCPNA, is a light yellow to brown crystalline powder built on a benzene ring carrying a chlorine atom and a nitro group positioned around the primary amino group, with minimal odour in solid form.
Its primary industrial role is as an azoic diazo component base: the amino group is diazotised and coupled onto naphthol substrates to build pigments such as Pigment Yellow types and disperse dyes such as Disperse Yellow, making OCPNA a foundational intermediate for a defined family of azo pigment chemistry.
At Chelora Dyes, OCPNA is crystallised and dried to a controlled melting point and colour specification, so downstream diazotisation and coupling reactions run cleanly and give a consistent, reproducible feedstock batch to batch.
- Appearance
- Light yellow to brown powder
- Odour
- Faint
- Solubility
- Ethanol, ether, acetic acid
- Function
- Diazo component
- Grade
- Technical / dye grade
Benzene ring with amino, chloro and nitro substituents
- Molecular formulaC6H5ClN2O2
- Molecular weight172.57 g/mol
- IUPAC name2-Chloro-4-nitroaniline
- Functional groupsPrimary amine, aryl chloride, nitro
- CAS number89-63-4
Technical product information
Standard specification for Chelora Dyes' technical grade Ortho Chloro Para Nitro Aniline. Custom-grade and bulk specifications are available on request.
| Chemical name | Ortho Chloro Para Nitro Aniline |
|---|---|
| Synonyms | OCPNA, 4-Chloro-2-nitroaniline, p-Chloro-o-nitroaniline |
| CAS number | 89-63-4 |
| Molecular formula | C6H5ClN2O2 |
| Molecular weight | 172.57 g/mol |
| Assay (purity) | ≥ 98.5% |
| Appearance | Light yellow to brown powder / crystals |
| Melting point | 116–119°C |
| Density | ~1.37 g/cm³ |
| Moisture content | ≤ 0.3% |
| Colour | Within reference standard |
| Solubility | Insoluble in water; soluble in ethanol, ether and acetic acid |
| Packaging | 25 kg / 50 kg multi-wall bags, fibre drums, bulk pallet packs |
| Shelf life | 24 months in sealed original packaging |
Applications of Ortho Chloro Para Nitro Aniline
Azoic pigment base
Diazotised and coupled to naphthol substrates in the production of Pigment Yellow types.
Disperse dye synthesis
Key intermediate in the manufacture of Disperse Yellow shades for polyester dyeing.
UV absorber intermediates
Building block used in the synthesis of benzotriazole-type UV absorbers.
Ice colour base
Used as a base for red lake and related organic pigment preparations.
Textile printing pastes
Diazo component in azoic printing paste formulations for textile colouration.
Analytical reagents
Used as a reference reagent in analytical and research-scale organic chemistry.
Why choose Chelora Dyes
Consistent purity
Assay controlled at ≥98.5% with melting point and colour verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From bags to fibre drums and bulk pallet packs.
Technical support
Process, diazotisation, and compliance guidance from our chemistry team.
Storage and guidelines
- Store in tightly sealed original bags or drums in a dry environment.
- Keep in a cool, dry, well-ventilated area away from direct sunlight and moisture.
- Keep containers closed when not in use to prevent caking and colour change.
- Segregate from strong oxidising agents, reducing agents and combustible materials.
- Use compatible packaging: lined multi-wall bags and fibre drums.
- Re-seal containers promptly after use and follow site procedures for toxic-solid handling.
Handling precautions
Ortho Chloro Para Nitro Aniline is toxic if swallowed, inhaled or absorbed through the skin, with a toxicity profile comparable to other nitroaniline derivatives, so it should be handled only with appropriate PPE and dust control.
Use chemically resistant gloves, eye and face protection, and adequate ventilation during weighing, charging, and any bulk handling operation.
Keep away from open flame and sources of ignition, and away from strong oxidisers. The substance is also classified as hazardous to aquatic life, so avoid release to drains or watercourses.
Refer to the full Safety Data Sheet for exposure limits, monitoring requirements, spill containment, disposal, and first-aid measures before use.
Frequently asked questions
What is Ortho Chloro Para Nitro Aniline used for?
OCPNA is chiefly used as an azoic diazo component base in the manufacture of pigments and disperse dyes, and as an intermediate for certain UV-absorber chemistries.
Is OCPNA soluble in water?
It is insoluble in water but is soluble in ethanol, ether and acetic acid, with limited solubility in gasoline-range hydrocarbons.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 98.5%, with melting point and colour held within tight limits.
How is OCPNA packaged and shipped?
As a solid, it is supplied in 25 kg / 50 kg multi-wall paper or plastic-lined bags, with bulk supply available on fibre drums or pallet-packed cartons for large volumes.
How should it be stored, and for how long?
In tightly sealed original bags or drums in a cool, dry, well-ventilated store away from direct sunlight, moisture, and strong oxidising or reducing agents. Shelf life is 24 months from manufacture when storage conditions are maintained.
Is it hazardous to handle?
OCPNA is toxic if swallowed, inhaled or absorbed through the skin, with toxicity comparable to other nitroaniline derivatives, and is classified as hazardous to aquatic life. It should be handled only with appropriate PPE and adequate ventilation. Review the Safety Data Sheet before any handling operation.
Do you provide a Certificate of Analysis?
Yes. Each batch ships with a Certificate of Analysis and Safety Data Sheet covering assay, melting point, moisture and colour.
