6-Chloro-2,4-dinitroaniline
A heavily substituted nitroaniline supplied as a diazo component for disperse dye and organic pigment manufacture.
What is 6-Chloro-2,4-dinitroaniline?
6-Chloro-2,4-dinitroaniline — 6C24DNA — is a yellow crystalline powder carrying an amine with two nitro groups and a chlorine around the ring. It is among the most heavily substituted colour bases in commercial use.
That substitution is deliberate. Each electron-withdrawing group deepens the shade of the resulting azo dye and improves its fastness, which is why bases of this type dominate the deep navy and black end of the disperse dye range used on polyester.
At Chelora Chemicals, 6C24DNA is crystallised and refined with assay, melting range, and moisture held to specification. As a dinitroaromatic it carries thermal sensitivity alongside its toxicity, and is supplied only to users equipped to handle both.
- Appearance
- Yellow crystalline powder
- Odour
- Faint, characteristic
- Solubility
- Practically insoluble in water; soluble in acetone and polar organics
- Function
- Diazo component / intermediate
- Grade
- Technical / dye
Formula diagram
Aniline carrying two nitro groups and a chlorine
- Molecular formulaC6H4ClN3O4
- Molecular weight217.57 g/mol
- IUPAC name6-Chloro-2,4-dinitroaniline
- Functional groupsPrimary aromatic amine, nitro, aryl chloride
- CAS number3531-19-9
Technical product information
Standard specification for Chelora Chemicals' technical and dye grade 6-Chloro-2,4-dinitroaniline. Custom-grade and bulk specifications are available on request.
| Chemical name | 6-Chloro-2,4-dinitroaniline |
|---|---|
| Synonyms | 6C24DNA, 2-Chloro-4,6-dinitroaniline, 6-Chloro-2,4-DNA |
| CAS number | 3531-19-9 |
| Molecular formula | C6H4ClN3O4 |
| Molecular weight | 217.57 g/mol |
| Assay (purity) | ≥ 98.0% |
| Appearance | Yellow crystalline powder |
| Melting point | 145–150°C |
| Isomer content | ≤ 0.5% |
| Moisture | ≤ 0.5% |
| Residue on ignition | ≤ 0.2% |
| Packaging | 25 kg bags, 200 kg drums |
| Shelf life | 24 months from date of manufacture |
Applications of 6-Chloro-2,4-dinitroaniline
Disperse dyes
Diazotised as a colour base for deep navy, blue, and black disperse dyes on polyester.
Azo dye manufacture
Feeds azo chemistry where strong electron withdrawal is needed for shade depth.
Organic pigments
Used as a diazo component in high-fastness pigment manufacture.
Dye intermediates
Applied where a heavily substituted aniline base is required.
Specialty chemicals
Used in the synthesis of substituted nitroaromatic derivatives.
Analytical standards
Supplied as a reference material for aromatic amine testing.
Why choose Chelora Chemicals
Every batch of 6-Chloro-2,4-dinitroaniline 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 ≥98% 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 200 kg drums and full container loads.
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 well below the melting range and never heat above the recommended handling temperature.
- 03Keep away from heat, sparks, open flame, and direct sunlight.
- 04Segregate from strong bases, reducing agents, and strong oxidising agents.
- 05Control dust rigorously and avoid skin contact at every transfer point.
- 06Prevent release to drains, surface water, and soil.
Handling precautions
6C24DNA is toxic by inhalation, ingestion, and skin absorption and may cause an allergic skin reaction. It is for industrial use by trained personnel only.
Dinitroanilines are absorbed through intact skin and cause methaemoglobin formation. Chemical-resistant gloves, coveralls, eye protection, and respiratory protection are required.
Dinitroaromatics store considerable energy and can decompose exothermically if overheated or contaminated. Drying and any heated processing require documented thermal assessment and temperature control.
Control dust during bag emptying, milling, and charging, and use local exhaust ventilation at all transfer points.
The product stains skin and surfaces strongly; treat any yellow discolouration as evidence of contact and wash immediately.
Refer to the full Safety Data Sheet for exposure limits, spill response, and first-aid measures before use.
Frequently asked questions
What is 6-Chloro-2,4-dinitroaniline used for?
It is a diazo component for disperse dyes, particularly the deep navy and black shades applied to polyester, and for high-fastness organic pigments.
Why does heavy substitution give deeper shades?
Each electron-withdrawing group on the diazo component pulls electron density through the azo linkage, shifting absorption toward longer wavelength. Two nitro groups plus a chlorine push the colour well into the deep blue and black range.
Does it need a special diazotising agent?
Almost always. With two nitro groups the amine is extremely weakly basic and will not diazotise usefully with sodium nitrite in dilute acid. Nitrosyl sulfuric acid is the standard route for bases of this type.
How does it differ from 2,4-dinitroaniline?
The added chlorine increases electron withdrawal further and improves the fastness of the finished dye, at the cost of a weaker, harder-to-diazotise amine.
Is it soluble in water?
Practically insoluble. It dissolves in acetone, DMF, and similar polar organics, and requires strongly acidic conditions for diazotisation.
What are the thermal hazards?
Dinitroaromatics store significant energy and can decompose exothermically if overheated or contaminated. Drying and heated processing need temperature control and a documented thermal assessment before scale-up.
What purity do you supply?
Standard grade is supplied at a minimum assay of 98% with isomer content at or below 0.5% and moisture at or below 0.5%. Tighter specifications can be produced to order.
What packaging sizes are available?
25 kg bags and 200 kg drums, with full container loads for bulk users. Samples are available for shade and coupling trials.
Is 6C24DNA hazardous?
Yes. It is toxic by several routes, skin-absorbable, a possible skin sensitiser, thermally sensitive, and hazardous to aquatic life. Dust control, PPE, and thermal controls are all required.
Are there regulatory restrictions on azo colourants?
Several jurisdictions restrict azo dyes that can release certain aromatic amines in consumer textiles and leather. Check whether your finished-article market imposes limits before committing to a route using this base.
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.