Para Nitro Toluene Ortho Sulfonic Acid | 0121-03-9

Description :

Para Nitro Toluene Ortho Sulfonic Acid Supplier & Distributor in India

ChemicalBull is a reliable Para Nitro Toluene Ortho Sulfonic Acid supplier, distributor and exporter in India for optical brighteners, fluorescent whitening agents, dye intermediates, textile chemicals, paper chemicals and speciality chemical manufacturing.

Para Nitro Toluene Ortho Sulfonic Acid, commonly written as p-Nitrotoluene-o-sulfonic Acid and abbreviated as PNTOSA, is also known as 4-Nitrotoluene-2-sulfonic Acid and 2-Methyl-5-nitrobenzenesulfonic Acid. Its molecular formula is C₇H₇NO₅S, and its CAS Number is 121-03-9.

Buyers comparing Para Nitro Toluene Ortho Sulfonic Acid manufacturers and suppliers can contact ChemicalBull for assay, moisture, free acidity, impurity limits, COA, TDS, MSDS/SDS, packing, availability and commercial pricing.

Need PNTOSA for optical brighteners, textile whitening chemicals or dye-intermediate manufacturing? Share your required specification, quantity, packing and destination to receive current availability and pricing.

Quick Answer

Para Nitro Toluene Ortho Sulfonic Acid is an aromatic sulfonic-acid intermediate mainly used to manufacture stilbene-based fluorescent whitening agents, optical brightener intermediates and selected dyes.

Buyers should confirm assay, moisture basis, free acidity, insoluble matter, isomer profile and supplied physical form before ordering.

Overview of Para Nitro Toluene Ortho Sulfonic Acid

Para Nitro Toluene Ortho Sulfonic Acid contains nitro, methyl and sulfonic-acid functional groups on an aromatic ring. This structure makes it useful as a reactive intermediate in the manufacture of fluorescent whitening agents and colour chemicals.

The term “para nitro, ortho sulfonic” describes the position of the nitro and sulfonic-acid groups relative to the methyl group. Confirming the exact chemical identity is important because other Nitrotoluene Sulfonic Acid isomers have different structures and process behaviour.

PNTOSA is commonly used as a precursor in the manufacture of stilbene-based intermediates. These intermediates are further processed into optical brighteners used by textile, paper and detergent manufacturers.

Commercial grades may differ in assay, water content, free sulfuric acid, insoluble matter, colour and isomer-related impurities. Product calculations should therefore use the actual supplied assay rather than only the gross material weight.

Applications of Para Nitro Toluene Ortho Sulfonic Acid

Fluorescent Whitening-Agent Manufacturing

Fluorescent whitening-agent manufacturers use Para Nitro Toluene Ortho Sulfonic Acid as an important raw material for producing selected stilbene-based brightener intermediates.

These intermediates are processed further to manufacture optical brighteners that improve the visual whiteness and brightness of suitable finished products.

Manufacturers should confirm assay, isomer purity, moisture and free acidity because these parameters can affect reaction conversion, colour and downstream purification.

Optical Brightener Intermediates

PNTOSA is used in the production of intermediates required for selected optical brightener grades.

Depending on the manufacturing route, it may be processed through condensation, oxidation, reduction or further functionalisation stages. The exact process depends on the target brightener and approved production method.

Consistent raw-material quality helps control reaction efficiency, filtration, intermediate colour and finished-product performance.

Textile Whitening Chemicals

Textile-chemical manufacturers use PNTOSA-derived intermediates to produce fluorescent whitening agents for selected fibres and textile-processing systems.

These brighteners are designed to improve the apparent whiteness of compatible textile materials by modifying their response to ultraviolet and visible light.

Para Nitro Toluene Ortho Sulfonic Acid is an industrial intermediate rather than a finished textile brightener. It requires further chemical processing before use in textile formulations.

Paper Brightener Manufacturing

Paper-chemical companies may use brightening agents produced from stilbene-based intermediates in pulp, paper and coating applications.

PNTOSA serves as an upstream raw material for manufacturing selected intermediates used in these brightener systems. It is not normally added directly to paper as a finished whitening agent.

Raw-material consistency can affect the colour, purity and performance of the final brightener manufactured from it.

Detergent Optical Brighteners

Detergent-additive manufacturers use selected fluorescent whitening agents in laundry formulations to improve the visual brightness of compatible fabrics.

Para Nitro Toluene Ortho Sulfonic Acid may be used as an intermediate in producing certain stilbene-based brightener chemistries required for these formulations.

The suitability of the resulting brightener depends on its solubility, fibre affinity, formulation stability and compatibility with other detergent ingredients.

Dye and Colour-Chemical Intermediates

Dye and colour-chemical manufacturers use PNTOSA in selected synthesis routes for direct dyes, fluorescent products and related aromatic intermediates.

Its nitro and sulfonic-acid groups provide useful functionality for subsequent chemical conversion. Manufacturers should evaluate reaction selectivity, by-product formation, colour and purification requirements before changing the product source.

Speciality Chemical Manufacturing

Speciality chemical companies may use Para Nitro Toluene Ortho Sulfonic Acid as an aromatic building block in compatible multi-stage synthesis routes.

The required specification depends on the target intermediate, reaction method and finished-product requirements. Buyers should provide any controlled limits for free acidity, iron, insoluble matter, water and related isomers when requesting material.

Why Industrial Buyers Source PNTOSA from ChemicalBull

The performance of Para Nitro Toluene Ortho Sulfonic Acid depends on more than the stated assay. Moisture, free acidity, isomer composition, colour and insoluble matter can influence conversion, filtration and the quality of the resulting brightener or dye intermediate.

ChemicalBull assists procurement and technical teams with specification matching, batch-specific COA, TDS, MSDS/SDS, packing information and commercial documentation.

We support optical-brightener manufacturers, dye-intermediate producers, textile-chemical companies, paper-chemical manufacturers, detergent-additive companies and speciality chemical processors.

Buyers can share their required assay, moisture limit, free-acidity limit, application, quantity, packing and destination to receive a specification-matched commercial offer.

Buy Para Nitro Toluene Ortho Sulfonic Acid

ChemicalBull supplies Para Nitro Toluene Ortho Sulfonic Acid for fluorescent whitening agents, optical brightener intermediates, dyes and speciality chemical manufacturing across India and selected international destinations.

For accurate product matching, provide:

• Required chemical name or approved synonym

• Minimum assay

• Maximum moisture

• Free-acidity limit

• Controlled impurity or isomer limits

• End-use application

• Trial or recurring quantity

• Preferred packing

• Delivery destination

• Required documentation

Request PNTOSA Availability and a Commercial Quote

Our team will confirm the available specification, technical documentation, packing options, expected lead time and commercial pricing.

Frequently Asked Questions

1. What is Para Nitro Toluene Ortho Sulfonic Acid used for?

   It is mainly used as an intermediate for stilbene-based fluorescent whitening agents, optical brighteners, textile chemicals and selected dye intermediates.
   
   

2. What are the other names for PNTOSA?

   It is also known as p-Nitrotoluene-o-sulfonic Acid, 4-Nitrotoluene-2-sulfonic Acid and 2-Methyl-5-nitrobenzenesulfonic Acid.
   
   

3. Is PNTOSA a finished optical brightener?

   No. PNTOSA is an industrial intermediate that undergoes further chemical processing to produce selected optical brightener intermediates and finished fluorescent whitening agents.
   
   

4. What specifications should buyers confirm before ordering?

   Buyers should confirm assay, moisture, free acidity, colour, insoluble matter, isomer-related impurities, physical form, packing and batch documentation.
   
   

5. Where can I buy Para Nitro Toluene Ortho Sulfonic Acid?

   ChemicalBull supplies PNTOSA for optical brightener, dye-intermediate and speciality chemical manufacturing. Share your specification, quantity, packing and destination to request availability and pricing.

ChemicalBull supplies Para Nitro Toluene Ortho Sulfonic Acid across India, serving customers in Andhra Pradesh, Arunachal Pradesh, Assam, Bihar, Chhattisgarh, Goa, Gujarat, Haryana, Himachal Pradesh, Jharkhand, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Manipur, Meghalaya, Mizoram, Nagaland, Odisha, Punjab, Rajasthan, Sikkim, Tamil Nadu, Telangana, Tripura, Uttar Pradesh, Uttarakhand, and West Bengal, as well as the Union Territories of Andaman & Nicobar Islands, Chandigarh, Dadra & Nagar Haveli and Daman & Diu, Delhi, Jammu & Kashmir, Ladakh, Lakshadweep, and Puducherry. We serve pharmaceutical, chemical, research, academic, laboratory, manufacturing, and industrial customers with reliable nationwide delivery.