Para Chloro Ortho Nitro Aniline PCONA · 4-Chloro-2-Nitroaniline · CAS 89-63-4
Chelora Chemicals is a supplier of Para Chloro Ortho Nitro Aniline (PCONA), the chloronitroaniline used as a diazo-component intermediate for azo dyes and pigments wherever this specific chlorine/nitro/amine arrangement on the ring is required. Every consignment leaves with a batch-specific COA and the current SDS.
Also known as: 4-Chloro-2-nitroaniline, 2-Nitro-4-chloroaniline, PCONA
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Price, lead time and a sample COA for Para Chloro Ortho Nitro Aniline, usually within one working day. We ship worldwide.
Request a Quote Email the DeskDocumentation
- Batch-specific COA (assay, colour, isomer purity)
- Safety Data Sheet (SDS)
- Dangerous-goods transport documents, where applicable
- Third-party inspection on request
- Certificate of origin
What is Para Chloro Ortho Nitro Aniline?
Para Chloro Ortho Nitro Aniline (PCONA) is a benzene ring carrying a primary amine, a chlorine para to the amine, and a nitro group ortho to the amine — chemical name 4-chloro-2-nitroaniline, formula C₆H₅ClN₂O₂. It is supplied as an orange crystalline powder or chunks.
Its value as an intermediate comes from the amine sitting alongside both an electron-withdrawing nitro group and a chlorine, which makes it a reliable diazo component for azo dye and pigment synthesis, and a building block for selected UV-absorber and pharmaceutical routes.
Commercially it is produced from para-dichlorobenzene by nitration followed by ammonolysis (amination), which displaces the chlorine activated by the adjacent nitro group while leaving the second chlorine in place.
Handling follows standard precautions for a chloronitroaniline — chemical-resistant gloves and eye protection, adequate ventilation, and storage away from incompatible materials such as strong oxidisers and strong acids.
Why PCONA specifically
- A specific chlorine-nitro-amine arrangement. The para-chlorine / ortho-nitro pattern relative to the amine is what downstream diazotisation chemistry is built around.
- Diazo component for azo dyes. A standard starting material for red and orange azo dye and pigment synthesis.
- UV-absorber and pharma building block. Used in selected UV-absorber and pharmaceutical intermediate routes needing this substitution pattern.
- Distinct from related isomers. Ortho Chloro Para Nitro Aniline (OCPNA, CAS 121-87-9) and plain Para Nitro Aniline are not drop-in substitutes — the chlorine position changes the chemistry.
How PCONA is Manufactured
PCONA is produced from para-dichlorobenzene (1,4-dichlorobenzene) in two main stages.
- Nitration. Para-dichlorobenzene is nitrated to give 1,4-dichloro-2-nitrobenzene.
- Ammonolysis. The chlorine ortho to the new nitro group is activated and is displaced by ammonia, giving 4-chloro-2-nitroaniline while the second, unactivated chlorine remains on the ring.
- Purification. The crude product is washed, crystallised and dried to the target assay and colour specification.
- Quality release and packing. Assay, isomer purity and colour are confirmed against specification before the batch is packed and released.
Typical Commercial Specification
Figures below are representative of commercial-grade PCONA. Tell us your downstream route and the grade you need, and we will advise on the specification to order against.
| Parameter | Typical Value |
|---|---|
| Appearance | Orange crystalline powder or chunks |
| PCONA content | 99% min by assay |
| Melting range | 117 – 119 °C, to grade |
| Moisture | 0.5% max |
Physical & Chemical Properties
| Property | Value |
|---|---|
| Chemical formula | C₆H₅ClN₂O₂ |
| Molecular weight | 172.57 g/mol |
| Appearance | Orange crystalline powder or chunks |
| Melting point | 117 – 119 °C |
| Boiling point | About 200 °C (estimate only — confirm with your supplier) |
| Density | About 1.37 g/mL |
| Flash point | About 191 °C |
| Water solubility | About 0.5 g/L — practically insoluble |
| Incompatibilities | Strong oxidisers, strong acids |
Behaviour in the process
PCONA's reactivity pattern is what dye and pigment producers are buying:
- Diazotisation. The free amine diazotises cleanly to give the diazonium salt used in azo coupling.
- Colour sensitivity. Colour and isomer purity are reported on the COA because both affect the shade of the final dye or pigment.
- Thermal stability. Stable under normal storage conditions away from strong oxidisers and strong acids.
PCONA and Related Chloronitroanilines
Choosing between chloronitroaniline isomers comes down to the exact position of the chlorine and nitro group relative to the amine that the target dye synthesis needs.
| Material | Substitution | When it is the right choice |
|---|---|---|
| PCONA | 4-Cl, 2-NO₂, 1-NH₂ | Routes needing a para-chlorine, ortho-nitro pattern |
| Ortho Chloro Para Nitro Aniline (OCPNA) | 2-Cl, 4-NO₂, 1-NH₂ | Routes needing an ortho-chlorine, para-nitro pattern instead |
| Para Nitro Aniline (PNA) | 4-NO₂, 1-NH₂ | Routes that need the nitroaniline without a ring chlorine |
| meta-Chloroaniline | 3-Cl, 1-NH₂ | Routes needing a chloroaniline with no nitro group at all |
Stated plainly: a diazotisation built around PCONA's substitution pattern needs this specific isomer — OCPNA and PNA have different reactivity and give different coupling positions, so they are not drop-in substitutes.
Industries We Supply PCONA To
The same chloronitroaniline feeds a dye-intermediate manufacturer and a UV-absorber or pharmaceutical intermediate producer. What changes is the downstream coupling chemistry and the documentation each requires.
Where PCONA is Used
In downstream functionalisation
PCONA's free amine is diazotised and coupled to build the target azo dye or pigment, while the ring chlorine and nitro group set the shade and fastness properties the dye chemist is designing for. This is often exactly why a route is built around this chloronitroaniline specifically rather than a related isomer.
Need a specific purity grade?
Tell us the purity grade you need, your downstream chemistry, the packing format you can receive and the annual quantity. We will come back with a price, a lead time and a sample COA.
Quality Control & Testing
Every lot is released against a batch-specific Certificate of Analysis, with isomer purity and colour reported alongside the main assay because both affect the shade of the final dye.
- PCONA content — by assay, the primary grade measure.
- Isomer purity — regioisomer carryover from nitration, reported because it affects coupling position and shade.
- Colour and melting range — reported as a freshness and purity indicator ahead of use.
Common Process Problems & Likely Causes
| Symptom | Likely cause | What to check |
|---|---|---|
| Off-shade dye product | Regioisomer carryover from nitration | Isomer purity figure on the COA |
| Poor diazotisation yield | Moisture or colour-grade impurities | Moisture and colour specification on the COA |
| Darkened material on receipt | Prolonged exposure to heat or light during storage | Storage conditions and age of the lot |
Packaging, Storage & Shipping
- Standard packing. Multi-ply paper or HDPE bags, typically 25 – 50 kg net, with bulk-bag and drum formats on contract supply.
- Moisture protection. Keep bags sealed and stored in a dry area; the material absorbs moisture if left open.
- Temperature control. Store in a cool, dry, well-ventilated area away from direct sun, heat and ignition sources.
- Material compatibility. Avoid contact with strong oxidisers and strong acids.
- Transport classification. Confirm the correct classification — including whether your grade is regulated at all — against your own current SDS before shipping.
Hazards & Safe Handling
PCONA is harmful if swallowed, in contact with skin or if inhaled. Standard precautions for a chloronitroaniline and good laboratory and plant practice apply throughout handling. Refer to the current SDS for your grade for the complete hazard classification.
- Skin and eye contact. Chemical-resistant gloves and goggles are standard practice for chloronitroanilines; rinse thoroughly with water on contact.
- Inhalation. Avoid dust generation when handling the powder; use adequate ventilation or local exhaust.
- PPE. Chemical-resistant gloves, safety goggles and, where dust exposure is a concern, a suitable respirator.
- Environment. Avoid uncontrolled release to water and follow local effluent rules.
Regulatory & Compliance Notes
PCONA is a registered specialty dye intermediate. Because obligations differ by territory and use, the notes below are orientation rather than legal advice.
- GHS classification. Commonly classified as harmful if swallowed, in contact with skin or if inhaled; the SDS carries the full hazard statements for your grade.
- REACH and chemical inventories. Registered under EU REACH and listed on major chemical inventories.
- Dangerous goods transport. Not uniformly regulated across suppliers and grades. Confirm the correct classification with your logistics/EHS team against your current SDS before shipping.
- HS code. Commonly declared under the aniline derivatives heading; confirm the exact tariff line with your customs broker for your jurisdiction.
We Supply PCONA Worldwide
Chelora Chemicals is a supplier and export partner, not a single-plant trader. We ship PCONA from India and from partner sources to customers across Asia, Europe, the Middle East, Africa, and North and South America, handling the export documentation and freight so the material arrives ready to use.
- Incoterms. EXW, FOB, CIF, CFR and DAP quoted to suit your purchasing terms and freight arrangements.
- Ports. Regular shipments through Nhava Sheva (JNPT) and Mundra, with other ports arranged as routing allows.
- Documentation. Commercial invoice, packing list, certificate of origin, COA and SDS issued as a complete set.
- Flexible volumes. From trial quantities up to repeat bulk shipments on a supply contract.
Buying PCONA from Chelora
We are an independent sourcing and supply partner. For this product that means settling three things at enquiry: the purity and isomer-purity grade your application needs, the packing format, and the quantity you are buying.
- Documentation on every lot. Batch-specific COA with assay and isomer breakdown, plus the current SDS.
- Analysis before commitment. Representative analysis shared ahead of a commercial order so your lab can qualify the material.
- Quantities. Trial quantities through to larger bulk shipments on contract supply.
- Inspection. Independent third-party inspection available at loading when the contract requires it.
- Related dye intermediates. Ortho Chloro Para Nitro Aniline, Para Nitro Aniline, meta-Chloroaniline and Ortho Dichloro Benzene alongside this product from one supplier.
How ordering works
- Send the enquiry. Purity, isomer-purity grade, quantity, destination port and the Incoterm you buy on.
- We quote. Price, lead time, packing format and a sample COA, normally within one working day.
- Qualify the supply. For first orders or dye-grade applications, we share the analysis so your technical team can sign off before you commit.
- Confirm the order. Proforma invoice issued; payment terms agreed against the volume and the relationship.
- Ship and document. Packed, labelled and loaded with the full export document set, and tracked through to arrival.
Para Chloro Ortho Nitro Aniline — Common Questions
The questions our technical desk is asked most often about PCONA. If yours isn't here, call or email and you will reach someone who knows the chemistry.
What is the CAS number of PCONA?
The CAS number for Para Chloro Ortho Nitro Aniline (4-chloro-2-nitroaniline) is 89-63-4, and its EC number is 201-925-4. Its molecular formula is C₆H₅ClN₂O₂ with a molecular weight of 172.57 g/mol.
What is PCONA used for?
It is used mainly as a diazo-component intermediate in azo dye and pigment synthesis, and as a building block in selected UV-absorber and pharmaceutical intermediate routes.
Do you supply PCONA worldwide?
Yes. Chelora Chemicals supplies and exports PCONA worldwide — across Asia Pacific, Europe, the Middle East, Africa and the Americas, as well as throughout India. Every consignment carries the COA and SDS.
How does it differ from Ortho Chloro Para Nitro Aniline (OCPNA)?
The chlorine and nitro positions relative to the amine are swapped — PCONA is 4-chloro-2-nitroaniline, while OCPNA is 2-chloro-4-nitroaniline — which changes the coupling chemistry and the shade of dye each produces.
How is PCONA manufactured?
By nitrating para-dichlorobenzene to give 1,4-dichloro-2-nitrobenzene, then displacing the activated chlorine with ammonia (ammonolysis) to give 4-chloro-2-nitroaniline.
Is PCONA hazardous?
It is commonly classified as harmful if swallowed, in contact with skin or if inhaled. Refer to the current SDS for your grade for the complete hazard classification.
Is PCONA classified as a dangerous good for transport?
Classification is not uniform across suppliers and grades. Confirm the correct transport classification — or confirm your grade is not regulated — against your own current SDS before relying on it for shipping documentation.
What are the melting point and density?
Typical figures are a melting point of 117–119 °C and a density around 1.37 g/mL. Confirm against your own supplier's COA for batch-specific figures.
How should PCONA be stored?
In sealed bags, cool, dry and away from direct sun, heat, ignition sources, strong oxidisers and strong acids.
What purity grades do you offer?
Standard commercial grade is 99% minimum by assay, with isomer purity and colour reported on the COA.
What packing sizes and order quantities are available?
Multi-ply paper or HDPE bags, typically 25–50 kg net, with bulk-bag and drum formats available on contract supply. Orders run from trial quantities up to repeat bulk loads.
Ready to source PCONA?
Send us your purity requirement and annual volume. You will get a price, a realistic lead time and a sample COA from someone who understands what the material has to do in your process — delivered anywhere in the world.