2,5-Dichloroaniline
A high-purity chlorinated aromatic amine supplied as flakes for azo pigment and dye manufacture, agrochemical intermediates, and fine chemical synthesis.
What is 2,5-Dichloroaniline?
2,5-Dichloroaniline, abbreviated 25DCA, is a white to beige crystalline solid carrying chlorine atoms in the ortho and para-adjacent positions of an aniline ring. It is produced by the reduction of 2,5-dichloronitrobenzene.
The ortho chlorine sits directly beside the amino group, which restricts rotation and influences how the molecule packs after diazotisation and coupling. That geometry is what gives pigments built on 25DCA their characteristic shade strength and heat stability.
At Chelora Chemicals, 25DCA is crystallised and flaked with isomer content, melting range, and moisture held to specification, giving pigment and dye manufacturers a consistent diazo component from batch to batch.
- Appearance
- White to beige crystalline flakes
- Odour
- Characteristic amine odour
- Solubility
- Slightly soluble in water; soluble in alcohol and ether
- Function
- Chemical intermediate
- Grade
- Technical / pigment
Formula diagram
Aniline ring chlorinated at the ortho and meta-para positions
- Molecular formulaC6H5Cl2N
- Molecular weight162.02 g/mol
- IUPAC name2,5-Dichloroaniline
- Functional groupsPrimary aromatic amine, aryl chloride
- CAS number95-82-9
Technical product information
Standard specification for Chelora Chemicals' technical grade 2,5-Dichloroaniline. Custom-grade and bulk specifications are available on request.
| Chemical name | 2,5-Dichloroaniline |
|---|---|
| Synonyms | 25DCA, 2,5-DCA, 1-Amino-2,5-dichlorobenzene |
| CAS number | 95-82-9 |
| Molecular formula | C6H5Cl2N |
| Molecular weight | 162.02 g/mol |
| Assay (purity) | ≥ 99.0% |
| Appearance | White to beige crystalline flakes |
| Melting point | 47–50°C |
| Boiling point | 251°C |
| Flash point | > 110°C (closed cup) |
| Isomer content | ≤ 0.5% |
| Moisture | ≤ 0.3% |
| Packaging | 25 kg bags, 500 kg jumbo bags, molten tanker |
| Shelf life | 24 months from date of manufacture |
Applications of 2,5-Dichloroaniline
Azo pigments
Diazotised and coupled to produce yellow, orange, and red organic pigments for inks and coatings.
Textile dyes
Supplies chlorinated diazo components for azo dyes with good wash and light fastness.
Agrochemical intermediates
Converted into amide and urea derivatives used in crop protection synthesis.
Pharmaceutical intermediates
Provides a chlorinated aniline core for amide and heterocycle formation in fine chemical routes.
Printing inks
Feeds pigment grades formulated for packaging, publication, and industrial ink systems.
Specialty chemicals
Used in the synthesis of optical brighteners, biocides, and other chlorinated amine derivatives.
Why choose Chelora Chemicals
Every batch of 2,5-Dichloroaniline 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% 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.
- 02Keep below 30°C — the product softens and cakes as it approaches its melting range.
- 03Protect from air and light exposure to limit discolouration.
- 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
25DCA is toxic by inhalation, ingestion, and skin absorption. It is for industrial use by trained personnel only.
Chlorinated anilines can be absorbed through intact skin and may affect the blood by forming methaemoglobin. Chemical-resistant gloves, coveralls, eye protection, and respiratory protection are required.
Because the melting point is low, warm-weather storage and transport can produce partially molten material — check drums and bags before opening and avoid skin contact with the liquid phase.
Contain all spills and dispose of waste through licensed chemical waste routes; the product is very toxic to aquatic organisms with long-lasting effects.
Refer to the full Safety Data Sheet for exposure limits, spill response, and first-aid measures before use.
Frequently asked questions
What is 2,5-Dichloroaniline used for?
It is an intermediate used mainly as a diazo component in azo pigment and dye manufacture, and as a building block for agrochemical and pharmaceutical intermediates. It is not used as a finished product.
How does 2,5-DCA differ from 3,4-DCA?
Both have the formula C6H5Cl2N and a molecular weight of 162.02, but the chlorine positions differ. 2,5-DCA melts around 50°C and dominates pigment and dye chemistry; 3,4-DCA melts around 71°C and is used mainly for herbicides. Substituting one for the other changes the downstream product entirely.
Why does the ortho chlorine matter in pigment chemistry?
A chlorine directly next to the amino group hinders rotation and changes how the finished pigment molecules stack in the crystal lattice. That packing controls shade, tinting strength, and heat stability, which is why pigment makers specify the isomer precisely.
Is it soluble in water?
Only slightly. It dissolves readily in alcohols, ether, acetone, and aromatic solvents. For diazotisation it is normally dissolved in acid before treatment with sodium nitrite.
Why does the product cake or clump in the bag?
Its melting point is only 47–50°C, so flakes can soften and fuse during warm-weather storage or transport. Keeping the store below 30°C and on pallets away from direct sun prevents most caking.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 99% with isomer content at or below 0.5% and moisture at or below 0.3%. Tighter specifications can be manufactured to order.
What packaging sizes are available?
25 kg bags, 500 kg jumbo bags, and molten product in heated tankers. Lab and pilot samples are available for trial work.
How long can it be stored?
24 months from date of manufacture in sealed original packaging under the recommended conditions. Some surface discolouration may develop over time without affecting assay.
Is 2,5-Dichloroaniline hazardous?
Yes. It is classified as acutely toxic by several routes, harmful on repeated exposure, and very toxic to aquatic life with long-lasting effects. Handling requires trained personnel, engineering controls, and full PPE per the Safety Data Sheet.
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.