2,5-Dichloro Nitro Benzene
A high-purity chlorinated nitroaromatic supplied as the direct precursor to 2,5-dichloroaniline and as an intermediate for pigment and dye manufacture.
What is 2,5-Dichloro Nitro Benzene?
2,5-Dichloro Nitro Benzene — 25DCNB — is a pale yellow crystalline solid produced by nitrating para dichlorobenzene, which places the nitro group on the only positions available between the two chlorines.
Its role is almost entirely as a precursor. Hydrogenation gives 2,5-dichloroaniline, the diazo component that anchors a family of azo pigments, and the chlorine positions established at the nitration stage carry through unchanged into the finished colour.
At Chelora Chemicals, 25DCNB is crystallised and refined with isomer content, melting range, and moisture held to specification, so that catalytic reduction proceeds to consistent yield without catalyst fouling.
- Appearance
- Pale yellow crystalline flakes
- Odour
- Faint aromatic
- Solubility
- Insoluble in water; soluble in alcohol, ether, benzene
- Function
- Chemical intermediate
- Grade
- Technical
Formula diagram
Nitro group with chlorines at the 2 and 5 positions
- Molecular formulaC6H3Cl2NO2
- Molecular weight192.00 g/mol
- IUPAC name1,4-Dichloro-2-nitrobenzene
- Functional groupsNitro, aryl chloride
- CAS number89-61-2
Technical product information
Standard specification for Chelora Chemicals' technical grade 2,5-Dichloro Nitro Benzene. Custom-grade and bulk specifications are available on request.
| Chemical name | 2,5-Dichloro Nitro Benzene |
|---|---|
| Synonyms | 25DCNB, 2,5-Dichloronitrobenzene, 1,4-Dichloro-2-nitrobenzene |
| CAS number | 89-61-2 |
| Molecular formula | C6H3Cl2NO2 |
| Molecular weight | 192.00 g/mol |
| Assay (purity) | ≥ 99.0% |
| Appearance | Pale yellow crystalline flakes |
| Melting point | 54–56°C |
| Boiling point | 267°C |
| Flash point | > 130°C (closed cup) |
| Isomer content | ≤ 0.5% |
| Moisture | ≤ 0.2% |
| Packaging | 25 kg bags, 500 kg jumbo bags, molten tanker |
| Shelf life | 24 months from date of manufacture |
Applications of 2,5-Dichloro Nitro Benzene
2,5-Dichloroaniline route
Hydrogenated to 2,5-dichloroaniline, the diazo component used across azo pigment manufacture.
Organic pigments
Feeds the pigment chain producing yellow, orange, and red organic colourants.
Azo dye intermediates
Converted into chlorinated diazo components for dye synthesis.
Agrochemical intermediates
Used in crop-protection routes requiring a dichlorinated aromatic core.
Pharmaceutical intermediates
Applied where an activated chlorine allows selective nucleophilic substitution.
Specialty chemicals
Used in biocide and specialty amine derivative manufacture.
Why choose Chelora Chemicals
Every batch of 2,5-Dichloro Nitro Benzene 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 40°C — the product melts near 55°C and cakes in hot storage.
- 03Keep away from heat, sparks, open flame, and direct sunlight.
- 04Segregate from strong oxidising agents, strong bases, and reducing agents.
- 05Control dust during bag handling; re-seal opened packaging promptly.
- 06Prevent release to drains, surface water, and soil; the product is hazardous to aquatic life.
Handling precautions
25DCNB is toxic by inhalation, ingestion, and skin absorption. It is for industrial use by trained personnel only.
Absorbed material can affect the blood by forming methaemoglobin. Chemical-resistant gloves, coveralls, eye protection, and respiratory protection are required.
Control dust during bag emptying, sieving, and charging, and use local exhaust ventilation at all transfer and melting points.
Hydrogenation of this product is strongly exothermic and requires its own process risk assessment, relief design, and catalyst handling controls.
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-Dichloro Nitro Benzene used for?
Principally as the precursor to 2,5-dichloroaniline, which goes into azo pigments and dyes. It also serves agrochemical and specialty chemical routes needing a dichlorinated aromatic core.
How is 25DCNB manufactured?
By nitrating para dichlorobenzene. Because the two chlorines occupy the 1 and 4 positions, the nitro group can only enter beside one of them, which makes the reaction unusually clean compared with other dichlorobenzene nitrations.
Why is this nitration more selective than others?
Symmetry. Para dichlorobenzene has only one type of available position, so nitration gives essentially one product. Nitrating the ortho isomer, by contrast, produces a mixture of 3,4- and 2,3-dichloronitrobenzene that must be separated.
What is the relationship between 25DCNB and 25DCA?
25DCNB is the nitro compound and 2,5-dichloroaniline is what you get by reducing it. Both are supplied in this range, and the nitro specification sets the ceiling on the amine's purity.
How does it differ from 3,4- and 2,3-dichloronitrobenzene?
All three share the formula C6H3Cl2NO2 and a weight of 192.00, differing only in chlorine placement. 25DCNB leads to pigments, 34DCNB to herbicides, and 23DCNB to pharmaceutical and agrochemical routes.
Is it soluble in water?
No. It is practically insoluble in water but dissolves in alcohols, ether, acetone, and aromatic solvents, so downstream chemistry runs in organic media or on the melt.
Why does the flake cake in the bag?
The melting point is around 55°C, so material stored in a hot warehouse can soften and fuse. Cool, palletised storage out of direct sun prevents this without affecting assay.
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 0.2%. 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 trial work.
Is 25DCNB hazardous?
Yes. It is acutely toxic by several routes, harmful on repeated exposure, and hazardous to aquatic life. Trained personnel, dust control, and full PPE are required 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.