Para Nitrobenzoic Acid
A nitro-substituted benzoic acid, supplied as 4-nitrobenzoic acid for use as a carboxylic acid intermediate across dye, pigment and fine chemical manufacture.
What is Para Nitrobenzoic Acid?
Para Nitrobenzoic Acid, formally 4-nitrobenzoic acid, is a pale yellow crystalline powder built on a benzene ring carrying a carboxylic acid group at C-1 and a nitro group at C-4.
That arrangement makes the molecule a widely used building block. The carboxylic acid function is readily esterified or converted to acid chlorides and amides, while the nitro group provides a route to the corresponding amino acid on reduction — the combination underpins its role as a starting point for dye, pigment and pharmaceutical intermediate synthesis.
At Chelora Dyes, Para Nitrobenzoic Acid is crystallised and dried to a controlled particle profile and low moisture, so esterification, amidation and reduction reactions downstream run cleanly and give consistent, reproducible results batch to batch.
- Appearance
- Pale yellow crystalline
- Odour
- Faint, characteristic
- Solubility
- Hot water, alcohol, alkali
- Function
- Carboxylic acid intermediate
- Grade
- Technical / pigment
Nitro-substituted benzoic acid
- Molecular formulaC7H5NO4
- Molecular weight167.12 g/mol
- IUPAC name4-Nitrobenzoic acid
- Functional groupsCarboxylic acid, nitro
- CAS number62-23-7
Technical product information
Standard specification for Chelora Dyes' technical grade Para Nitrobenzoic Acid. Custom-grade and bulk specifications are available on request.
| Chemical name | Para Nitrobenzoic Acid |
|---|---|
| Synonyms | 4-Nitrobenzoic acid, p-Nitrobenzoic acid, PNBA |
| CAS number | 62-23-7 |
| Molecular formula | C7H5NO4 |
| Molecular weight | 167.12 g/mol |
| Assay (purity) | ≥ 98.0% |
| Appearance | Pale yellow crystalline powder or needles |
| Melting point | 238–241°C |
| Moisture content | ≤ 0.5% |
| Insoluble matter | ≤ 0.2% |
| Solubility | Slightly soluble in cold water; soluble in hot water, alcohol and dilute alkali |
| Packaging | 25 kg / 50 kg bags, 500–1000 kg jumbo bags |
| Shelf life | 24 months in sealed original packaging |
Applications of Para Nitrobenzoic Acid
Dye & pigment intermediates
Converted to esters, amides and reduced amine derivatives used across dye and pigment manufacture.
Pharmaceutical intermediates
A well-established starting material for local anaesthetic and preservative intermediate synthesis.
Fine chemical synthesis
Feeds esterification and amidation routes toward specialty aromatic intermediates.
Reduction chemistry feedstock
Reduced to 4-aminobenzoic acid derivatives for further downstream synthesis.
Analytical reagents
Used as a reference compound in analytical and laboratory-scale synthesis work.
Custom synthesis
Supplied to order for custom manufacturing and contract synthesis projects.
Why choose Chelora Dyes
Consistent purity
Assay controlled at ≥98% with moisture and colour verified before dispatch.
Full documentation
COA, SDS, and regulatory data supplied with every shipment.
Flexible volumes
From 25 kg bags to jumbo-bag bulk quantities.
Technical support
Process, conversion, and compliance guidance from our chemistry team.
Storage and guidelines
- Store in tightly sealed original packaging in a dry environment.
- Keep in a cool, dry, well-ventilated area away from direct sunlight and heat.
- Protect from moisture pickup — the powder can cake if exposed to humid air.
- Segregate from strong oxidising agents and strong alkalis.
- Use compatible containers: lined HDPE bags or drums.
- Re-seal bags promptly after use to preserve moisture and assay specification.
Handling precautions
Para Nitrobenzoic Acid is a fine crystalline powder that can cause irritation to skin, eyes and the respiratory tract if handled without controls.
Use dust control measures, chemically resistant gloves, and eye protection during weighing, charging, and any bulk handling operation.
Provide local exhaust ventilation where dust generation is likely, and avoid breathing dust.
Refer to the full Safety Data Sheet for exposure limits, spill containment, disposal, and first-aid measures before use.
Frequently asked questions
What is Para Nitrobenzoic Acid used for?
Para Nitrobenzoic Acid is used as a carboxylic acid intermediate in dye, pigment and fine chemical manufacture, and is a common starting material for further esterification, amidation and reduction chemistry toward aminobenzoic acid derivatives.
How is Para Nitrobenzoic Acid related to Para Nitrobenzamide?
Para Nitrobenzoic Acid is the parent carboxylic acid from which Para Nitrobenzamide, the corresponding primary amide, is typically prepared; both share the same nitro-substituted benzene ring.
Is Para Nitrobenzoic Acid soluble in water?
It is only slightly soluble in cold water but dissolves more readily in hot water, alcohol and dilute alkali, where the carboxylic acid group forms a soluble salt.
What purity do you supply?
Standard technical grade is supplied at a minimum assay of 98%, with moisture and melting range held within tight limits. Higher assay grades can be manufactured to order.
What packaging sizes are available?
25 kg and 50 kg multiwall paper or HDPE-lined bags, with bulk supply available in 500 kg and 1000 kg jumbo bags.
How should it be stored, and for how long?
In sealed original packaging in a cool, dry, ventilated store away from strong oxidisers and alkalis. Shelf life is 24 months from manufacture when storage conditions are maintained.
Is it hazardous to handle?
It is an irritant and should be handled with standard PPE, dust control and adequate ventilation. Review the Safety Data Sheet before any handling operation.
Do you provide a Certificate of Analysis?
Yes. Each batch ships with a Certificate of Analysis and Safety Data Sheet covering assay, moisture, appearance and melting point.
