Para Chloro Aniline
A high-purity chlorinated aromatic amine supplied as flakes for azo dye and pigment manufacture, agrochemical actives, and pharmaceutical intermediate synthesis.
What is Para Chloro Aniline?
Para Chloro Aniline — PCA, or 4-chloroaniline — is a white to pale beige crystalline solid with a chlorine atom directly opposite the amino group. It is produced by reducing para nitrochlorobenzene.
The para chlorine withdraws electron density without blocking the amino group sterically, which makes PCA an unusually well-behaved diazo component: it couples predictably and gives colours with good fastness. That reliability is why it appears across so much of the azo dye and pigment portfolio.
At Chelora Chemicals, PCA is crystallised and refined with isomer content, melting range, and moisture held to specification, giving dye, pigment, and agrochemical manufacturers consistent diazotisation and condensation behaviour.
- Appearance
- White to pale beige crystalline flakes
- Odour
- Characteristic amine odour
- Solubility
- Slightly soluble in water; soluble in alcohol, ether, dilute acid
- Function
- Chemical intermediate
- Grade
- Technical / dye
Formula diagram
Aniline ring with chlorine in the para position
- Molecular formulaC6H6ClN
- Molecular weight127.57 g/mol
- IUPAC name4-Chloroaniline
- Functional groupsPrimary aromatic amine, aryl chloride
- CAS number106-47-8
Technical product information
Standard specification for Chelora Chemicals' technical grade Para Chloro Aniline. Custom-grade and bulk specifications are available on request.
| Chemical name | Para Chloro Aniline |
|---|---|
| Synonyms | PCA, 4-Chloroaniline, p-Chloroaniline, 4-Chlorobenzenamine |
| CAS number | 106-47-8 |
| Molecular formula | C6H6ClN |
| Molecular weight | 127.57 g/mol |
| Assay (purity) | ≥ 99.5% |
| Appearance | White to pale beige crystalline flakes |
| Melting point | 70–72°C |
| Boiling point | 232°C |
| Flash point | 120°C (closed cup) |
| Isomer content | ≤ 0.3% |
| Moisture | ≤ 0.3% |
| Packaging | 25 kg bags, 500 kg jumbo bags, molten tanker |
| Shelf life | 24 months from date of manufacture |
Applications of Para Chloro Aniline
Azo dyes
Diazotised as a colour base for azo dyes used across textile, leather, and paper applications.
Organic pigments
Supplies a chlorinated diazo component for yellow, orange, and red pigment manufacture.
Agrochemicals
Used in the synthesis of insecticide and herbicide actives built on a chloroaniline core.
Pharmaceutical intermediates
Feeds the manufacture of antiseptic and API building blocks including biguanide chemistry.
Rubber chemicals
Applied in the synthesis of amine-based antioxidants and processing chemicals.
Specialty chemicals
Used in corrosion inhibitors, photographic chemicals, and specialty amine derivatives.
Why choose Chelora Chemicals
Every batch of Para Chloro Aniline is manufactured, tested, and documented to a standard that formulators and process chemists can build on with confidence — from first sample to full production volume.
Consistent purity
Assay controlled at ≥99.5% with isomer content and melting range verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From 25 kg bags to jumbo bags and molten tanker supply.
Technical support
Process, handling, and compliance guidance from our chemistry team.
Storage and guidelines
- 01Store in tightly closed original packaging in a cool, dry, well-ventilated store.
- 02Protect from air and light — the product darkens on oxidation.
- 03Keep away from heat, ignition sources, and direct sunlight.
- 04Segregate from strong oxidising agents, acids, and acid chlorides.
- 05Keep bags palletised and dry, and re-seal opened packaging promptly.
- 06Prevent any release to drains, surface water, or soil — the product is very toxic to aquatic life.
Handling precautions
PCA is toxic by inhalation, ingestion, and skin absorption, and is classified as a suspected carcinogen. It is for industrial use by trained personnel only.
Chloroanilines are readily absorbed through intact skin and cause methaemoglobin formation, which reduces the blood's oxygen-carrying capacity. Chemical-resistant gloves, coveralls, eye protection, and respiratory protection are required.
Control dust during bag emptying and charging, and use local exhaust ventilation at all transfer and melting points.
The product is very toxic to aquatic organisms with long-lasting effects. Contain all spills and dispose of waste through licensed chemical waste routes.
Refer to the full Safety Data Sheet for exposure limits, medical surveillance, spill response, and first-aid measures before use.
Frequently asked questions
What is Para Chloro Aniline used for?
It is an intermediate for azo dyes and pigments, agrochemical actives, pharmaceutical building blocks including antiseptic chemistry, and rubber chemicals. It is not used as a finished product.
How is PCA manufactured?
By reducing para nitrochlorobenzene, usually by catalytic hydrogenation. The isomer purity of the PNCB feed carries through directly, which is why both products are specified on isomer content.
What is the difference between PCA and the ortho isomer?
Both are C6H6ClN, but placing the chlorine para rather than ortho to the amino group changes basicity, coupling behaviour, and the geometry of the finished dye or active. The two are not interchangeable.
Why does the flake turn grey, pink, or brown?
Chloroanilines oxidise slowly in air and light, generating coloured surface impurities. Assay is usually unaffected, but sealed, cool, dark storage preserves appearance for colour-sensitive applications.
Is PCA soluble in water?
Only slightly in neutral water. It dissolves readily in alcohols, ether, and dilute mineral acid, and acid dissolution is the normal first step before diazotisation.
Can it be supplied molten?
Yes, for bulk users. With a melting point around 71°C, molten supply in heated tankers avoids dust exposure and handling losses, but requires dedicated heated lines at the receiving site.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 99.5% with isomer content at or below 0.3% and moisture at or below 0.3%. Tighter specifications can be produced to order.
What packaging sizes are available?
25 kg bags, 500 kg jumbo bags, and molten product in heated tankers. Samples are available for shade and coupling trials.
Is PCA hazardous?
Yes, and notably so. It is acutely toxic by several routes, readily absorbed through skin, classified as a suspected carcinogen, and very toxic to aquatic life with long-lasting effects. Full engineering controls and PPE are required.
Why is skin absorption emphasised for this product?
Chloroanilines pass through intact skin efficiently, so a splash that is not immediately washed off can produce a systemic dose without any inhalation exposure. Glove selection, breakthrough time, and prompt decontamination matter more here than for many solids.
Do you provide a Certificate of Analysis?
Yes. Every batch is dispatched with a Certificate of Analysis and Safety Data Sheet covering assay, isomer content, melting range, moisture, and appearance.