Para Nitro Toluene 4-Nitrotoluene · CAS 99-99-0
Chelora Chemicals is a supplier of Para Nitro Toluene, the 4-substituted isomer of nitrotoluene used as a building block for p-toluidine, dye intermediates, rubber chemicals and agrochemical synthesis where this specific substitution pattern is required. Every consignment leaves with a batch-specific COA and the current SDS.
Also known as: 4-Nitrotoluene, p-Nitrotoluene, PNT, para-Nitrotoluol
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Price, lead time and a sample COA for Para Nitro Toluene, usually within one working day. We ship worldwide.
Request a Quote Email the DeskDocumentation
- Batch-specific COA (assay, isomer purity, melting point)
- Safety Data Sheet (SDS)
- UN 3446 dangerous-goods transport documents
- Third-party inspection on request
- Certificate of origin
What is Para Nitro Toluene?
Para Nitro Toluene, also known as 4-nitrotoluene, is a toluene ring carrying a nitro group at the 4-position relative to the methyl group, formula C₇H₇NO₂. It is supplied as a pale yellow crystalline solid or flakes, one of three positional isomers formed when toluene is nitrated.
Its value as an intermediate comes from the nitro group sitting directly across the ring from the methyl group, which gives it a distinct reactivity and melting behaviour compared with the ortho- and meta-nitrotoluene isomers formed alongside it. It is used across dye, rubber-chemical and agrochemical synthesis wherever this para-substitution pattern is the structural requirement.
Commercially it is produced by nitrating toluene with a mixed-acid system, then separating the para-isomer from the ortho- and meta- fractions by fractional distillation and crystallisation.
Handling follows standard precautions for a nitroaromatic — chemical-resistant gloves and eye protection, adequate ventilation, and storage away from incompatible materials such as strong oxidisers and strong acids.
Why Para Nitro Toluene specifically
- A specific nitro-methyl relationship. The para (4-) substitution pattern gives reactivity distinct from the ortho- and meta-nitrotoluene isomers.
- Dye intermediate. Reduced to p-toluidine, a key building block for azo dyes and pigments.
- Rubber & agrochemical building block. A starting material for rubber-chemical and agrochemical intermediate routes needing a para-nitrotoluene.
- Distinct from ortho- and meta-isomers. The melting point, reactivity and crystallisation behaviour differ enough from 2-nitrotoluene and 3-nitrotoluene that they are not interchangeable in most syntheses.
How Para Nitro Toluene is Manufactured
Para Nitro Toluene is produced by nitrating toluene, typically with a mixed nitric acid/sulfuric acid system, which generates a mixture of ortho-, meta- and para-nitrotoluene isomers.
- Nitration. Toluene is nitrated under controlled temperature with mixed acid, forming the three isomeric nitrotoluenes.
- Separation. The crude mixture is washed and the bulk of the meta-isomer is removed, since it forms the largest minor fraction.
- Purification. The remaining ortho-/para- mixture is fractionally distilled and crystallised to isolate the para-isomer to specification.
- Quality release and packing. Assay, melting point and isomer purity are confirmed against specification before the batch is packed and released.
Typical Commercial Specification
Figures below are representative of commercial-grade Para Nitro Toluene. Tell us your downstream route and the grade you need, and we will advise on the specification to order against.
| Parameter | Typical Value |
|---|---|
| Appearance | Pale yellow crystalline solid/flakes |
| Para Nitro Toluene content | 99% min by GC assay |
| Isomer purity | ortho- and meta-nitrotoluene, trace levels to grade |
| Melting point | To grade; purity indicator ahead of use |
Physical & Chemical Properties
| Property | Value |
|---|---|
| Chemical formula | C₇H₇NO₂ |
| Molecular weight | 137.14 g/mol |
| Appearance | Pale yellow crystalline solid/flakes |
| Melting point | About 52–54 °C |
| Boiling point | About 238 °C |
| Density | About 1.29–1.39 g/mL |
| Flash point | About 106 °C |
| Incompatibilities | Strong oxidisers, strong acids |
Behaviour in the process
Para Nitro Toluene's reactivity pattern is what dye, rubber-chemical and agrochemical intermediate producers are buying:
- Nitro-group reactivity. The nitro group can be reduced to the corresponding amine (p-toluidine) for downstream dye and rubber-chemical chemistry.
- Methyl-group reactivity. The methyl group supports side-chain functionalisation routes used in certain intermediate syntheses.
- Thermal stability. Stable under normal storage conditions away from strong oxidisers and strong acids.
Para Nitro Toluene and Related Nitroaromatics
Choosing between nitrotoluene isomers, or between a nitrotoluene and a nitroaniline, comes down to the position of the substituent and which functional group the target synthesis needs.
| Material | Substitution | When it is the right choice |
|---|---|---|
| Para Nitro Toluene | 4-NO₂, 1-CH₃ | Routes needing the para-nitro pattern specifically |
| ortho-Nitrotoluene | 2-NO₂, 1-CH₃ | Routes needing the ortho-nitro pattern instead |
| meta-Nitrotoluene | 3-NO₂, 1-CH₃ | Routes needing the meta-nitro pattern instead |
| Para Nitro Aniline | 4-NO₂, 1-NH₂ | Routes needing a pre-reduced amine rather than a nitrotoluene |
Stated plainly: a synthesis built around the para-nitro pattern on a toluene ring needs this specific isomer — the ortho- and meta-nitrotoluene isomers have different reactivity and are not drop-in substitutes.
Industries We Supply Para Nitro Toluene To
The same nitrotoluene isomer feeds a dye-intermediate manufacturer, a rubber-chemical producer and an agrochemical formulator. What changes is the downstream functionalisation chemistry and the documentation each requires.
Where Para Nitro Toluene is Used
In downstream functionalisation
Para Nitro Toluene's nitro group is carried through reduction, and its methyl group through side-chain chemistry, to build the target dye, rubber-chemical or agrochemical intermediate. The para-nitro position gives reactivity distinct from the ortho- and meta-isomers, which is often exactly why a route is designed around this material specifically.
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 reported alongside the main assay because ortho- and meta-nitrotoluene carryover affects downstream melting point and reaction selectivity.
- Para Nitro Toluene content — by GC assay, the primary grade measure.
- Isomer purity — ortho- and meta-nitrotoluene carryover, reported because it affects downstream chemistry.
- Melting point — reported because it is a sensitive indicator of isomer purity.
Common Process Problems & Likely Causes
| Symptom | Likely cause | What to check |
|---|---|---|
| Off-target reaction product | ortho- or meta-nitrotoluene isomer carryover | Isomer purity figure on the COA |
| Lower-than-expected melting point on receipt | Isomer carryover or incomplete separation | Melting point and isomer breakdown on the COA |
| Off-shade downstream dye product | Isomer carryover at the p-toluidine reduction stage | Isomer specification on the COA for the lot used |
Packaging, Storage & Shipping
- Standard packing. HDPE bags or fibre drums, typically 25 – 200 kg net, with larger bulk formats on contract supply.
- Moisture protection. Keep containers tightly sealed and store in a dry area to protect the crystalline material.
- 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. Commonly shipped under UN 3446 (Nitrotoluenes, solid), Class 6.1, Packing Group II — confirm the correct entry and packing group against your own current SDS before shipping.
Hazards & Safe Handling
Para Nitro Toluene is toxic if swallowed, in contact with skin or if inhaled, and may cause damage to organs through prolonged or repeated exposure. Standard precautions for a nitroaromatic and good laboratory and plant practice apply throughout handling.
- Skin and eye contact. Chemical-resistant gloves and goggles are standard practice for nitroaromatics; rinse thoroughly with water on contact.
- Inhalation. Use adequate ventilation when handling, given the material's toxicity and dust-forming nature.
- PPE. Chemical-resistant gloves, safety goggles and, where dust exposure is a concern, a suitable respirator.
- Fire. Combustible; keep away from open flame and strong oxidisers, which can increase fire and explosion risk.
Regulatory & Compliance Notes
Para Nitro Toluene is a registered specialty nitroaromatic. Because obligations differ by territory and use, the notes below are orientation rather than legal advice.
- GHS classification. Classified as toxic if swallowed, in contact with skin or if inhaled (Signal word: Danger); 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. Commonly shipped under UN 3446 (Nitrotoluenes, solid), Class 6.1, Packing Group II. Confirm the correct entry and packing group with your logistics/EHS team against your current SDS before shipping.
- HS code. Commonly declared under the nitro derivatives of hydrocarbons heading; confirm the exact tariff line with your customs broker for your jurisdiction.
We Supply Para Nitro Toluene Worldwide
Chelora Chemicals is a supplier and export partner, not a single-plant trader. We ship Para Nitro Toluene 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 Para Nitro Toluene 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 nitroaromatics. Para Nitro Aniline, ortho-nitrotoluene and other nitroaromatic isomers 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 Nitro Toluene — Common Questions
The questions our technical desk is asked most often about Para Nitro Toluene. If yours isn't here, call or email and you will reach someone who knows the chemistry.
What is the CAS number of Para Nitro Toluene?
The CAS number for Para Nitro Toluene (4-Nitrotoluene) is 99-99-0, and its EC number is 202-808-0. Its molecular formula is C₇H₇NO₂ with a molecular weight of 137.14 g/mol.
What is Para Nitro Toluene used for?
It is used as a building block for p-toluidine, dye and pigment intermediates, rubber-chemical intermediates and agrochemical synthesis requiring the para-nitro substitution pattern.
Do you supply Para Nitro Toluene worldwide?
Yes. Chelora Chemicals supplies and exports Para Nitro Toluene 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- and meta-nitrotoluene?
The nitro group's position relative to the methyl group is different — para (4-) versus ortho (2-) or meta (3-) — which changes the melting point, reactivity and which target molecules each isomer is suited for.
How is Para Nitro Toluene manufactured?
By nitrating toluene with a mixed nitric acid/sulfuric acid system, then separating and purifying the para-isomer from the ortho- and meta- fractions by distillation and crystallisation.
Is Para Nitro Toluene hazardous?
It is toxic if swallowed, in contact with skin or if inhaled, and may cause organ damage through prolonged exposure. Refer to the current SDS for your grade for the complete hazard classification.
What is the UN number and transport classification?
Nitrotoluenes are commonly shipped under UN 3446, Class 6.1, Packing Group II. Confirm the correct entry and packing group against your own current SDS before relying on it for shipping documentation.
What are the melting point, boiling point and density?
Typical figures are a melting point around 52–54 °C, a boiling point around 238 °C, and a density around 1.29–1.39 g/mL. Confirm against your own supplier's COA for batch-specific figures.
How should Para Nitro Toluene be stored?
In sealed containers, cool, dry and away from direct sun, heat, ignition sources and strong oxidisers or strong acids. Keep the crystalline material protected from moisture.
What purity grades do you offer?
Standard commercial grade is 99% minimum by GC assay, with isomer purity (versus ortho- and meta-nitrotoluene) and melting point reported on the COA.
What packing sizes and order quantities are available?
HDPE bags or fibre drums, typically 25–200 kg net, with larger bulk formats available on contract supply. Orders run from trial quantities up to repeat bulk loads.
Ready to source Para Nitro Toluene?
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.