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Home Products 4-Nitroaniline-2-Sulfonic Acid

Sulfonic Acid Series Sulfamic Acid Series Guanidine Series

Sulfonic Acid Series

Sulfamic Acid Series

Guanidine Series

4-Nitroaniline-2-Sulfonic Acid

Specifications

HS Code	626564
Chemical Formula	C6H6N2O5S
Molecular Weight	218.19 g/mol
Appearance	Yellow to brown crystals or powder
Solubility In Water	Slightly soluble
Melting Point	280 - 282 °C
Boiling Point	Decomposes before boiling
Density	1.66 g/cm³
Acidity Pka	Relevant acidic groups have specific pKa values related to sulfonic acid and other acidic moieties
Stability	Stable under normal conditions, but may decompose on heating or in contact with strong oxidizing agents
Hazardous Nature	Harmful if swallowed, inhaled or in contact with skin; may cause irritation

As an accredited 4-Nitroaniline-2-Sulfonic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

Packing & Storage

Packing	25 - kg bags of 4 - Nitroaniline - 2 - Sulfonic Acid, well - sealed for chemical storage.
Storage	4 - Nitroaniline - 2 - Sulfonic Acid should be stored in a cool, dry, well - ventilated area, away from heat sources and open flames. Keep it in a tightly - sealed container to prevent moisture absorption and exposure to air. Store it separately from oxidizing agents, reducing agents, and bases, as these may react with it, and ensure the storage area is accessible for easy handling in case of emergencies.
Shipping	4 - Nitroaniline - 2 - Sulfonic Acid should be shipped in tightly - sealed containers, protected from moisture and heat. It must comply with relevant hazardous chemical shipping regulations to ensure safe transportation.

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General Information

Historical Development

4 - Nitroaniline - 2 - Sulfonic Acid is also a product of chemistry. Looking back at its historical development, chemists in the past have been working tirelessly on the path of chemical exploration. At the beginning, the understanding of the properties and reactions of many compounds was still shallow.
However, with the passage of time, scholars have devoted themselves to research and made progress in experiments. After countless attempts and failures, the method of synthesizing 4 - Nitroaniline - 2 - Sulfonic Acid was finally discovered. During this process, various reaction conditions were explored in detail, and temperature, reagent ratio, etc. were repeatedly debugged.
From the initial ignorance and exploration to the gradual clarification of its synthesis path, the wisdom and perseverance of chemical craftsmen were fully demonstrated. The birth of 4 - Nitroaniline - 2 - Sulfonic Acid is an important symbol in the development of chemistry, laying the foundation for subsequent research and application in many fields.

Product Overview

4 - Nitroaniline - 2 - Sulfonic Acid is an important product in the chemical industry. This product has unique properties and often takes the form of [specific color and morphology]. Its preparation requires delicate chemical processes, and under suitable reaction conditions, it is converted from specific reactants according to the established process.
In industrial use, it plays a key role in the field of dye synthesis. With its own structural characteristics, it can endow dyes with excellent color and stability, making the dyed product bright and long-lasting. In the pharmaceutical field, it is a key intermediate, assisting the development of many drugs, and has a profound impact on drug activity and efficacy.
However, caution is required when handling this product. Due to its certain chemical activity, contact with specific substances or encounter uncomfortable environments, or cause adverse reactions. Therefore, strict safety procedures need to be followed, properly stored and used to ensure personnel safety and smooth production.

Physical & Chemical Properties

The physicochemical properties of 4-nitroaniline-2-sulfonic acid are quite critical. Looking at its physical properties, it is often in a solid state, with a yellowish color or a crystalline form, and a subtle glow can be seen in sunlight.
When it comes to chemical properties, it is acidic. Because it contains sulfonic acid groups, it can neutralize with alkali substances, just like yin and yang. On the stage of chemical reactions, the nitro and amino groups of 4-nitroaniline-2-sulfonic acid can participate in various reactions, such as nitro groups can be reduced and amino groups can be replaced, just like dancers on the stage. Its solubility also varies in organic solvents. It may be partially soluble in some polar solvents, while it is more insoluble in non-polar solvents. This property is related to its separation and purification.

Technical Specifications & Labeling

4 - Nitroaniline - 2 - Sulfonic Acid is also a chemical product. The technology of its creation, the quality of raw materials, the quality of reverse parts, and the order of steps are all in it. If you want to obtain 4 - Nitroaniline - 2 - Sulfonic Acid, you need to precisely control the quality and force of the reaction, and the appropriate catalysis.
And (commodity), including the chemical formula, molecular weight, external shape, melting and boiling, solubility, etc. Its outer layer or powder, or crystal, the chemical formula clarifies its constituent elements, and the molecular weight helps to determine its properties. Knowing its melting temperature and solubility, it is easy to use and use. In this way, the technical specifications (commodity quality) can be improved before the product of 4-Nitroaniline-2-Sulfonic Acid can be used.

Preparation Method

The method of making 4 - Nitroaniline - 2 - Sulfonic Acid requires the preparation of raw materials first. Starting with aniline, it is co-placed with sulfuric acid and heated to obtain aniline sulfonic acid. In this step, the temperature should be controlled to prevent side reactions.
times, take the obtained aniline sulfonic acid and mix it with nitric acid and sulfuric acid. Slowly enter it, stabilize its temperature, and make nitrification to obtain 4 - Nitroaniline - 2 - Sulfonic Acid. This process requires heavy temperature control and speed control, otherwise the yield may be low and there may be many impurities.
After the reaction is completed, the product is precipitated by an appropriate method. It can be cooled, crystallized, and filtered to obtain crude products, and then recrystallized to purify them. During this period, the solvent is selected to control temperature and time to improve the purity of the product. The setting of the device is also related to success or failure. It is appropriate to make the materials mix evenly and transfer heat smoothly, and to prepare equipment for temperature control and pressure control to ensure the smooth reaction.

Chemical Reactions & Modifications

Taste the industry of chemical industry, in the change of matter, there are endless wonders. Today there is 4 - Nitroaniline - 2 - Sulfonic Acid, which is related to the reaction and modification of chemistry, and is worth studying.
The chemical reaction of the husband requires the adjustment of temperature and pressure, accompanied by an appropriate agent, to be able to go smoothly. The process is also the clutch between molecules, like the contract between yin and yang, with subtle changes. If you want to get a pure product, you must be careful to observe all ends and do not let impurities disturb it.
As for modification, it is related to the sublimation of its quality. Either adjust its structure, or change its sexual characteristics, hoping to be used in a wider area. However, the way of modification is not achieved overnight, and it is necessary to try it again and again, and analyze the results in detail to achieve the best.
Our chemical researchers should inherit the wisdom of the ancient sages, the principle of minimalism, and the nature of exploring things. They are the refinement of 4-Nitroaniline-2-Sulfonic Acid, and try their best to promote the prosperity of chemical industry.

Synonyms & Product Names

4-Nitroaniline-2-sulfonic acid, also known as p-nitro-o-aminobenzenesulfonic acid. Looking at its name, it is a chemical synthesis. It is widely used in the field of chemical industry. Or it can be used as a dye intermediate to add to the brilliant color; it can also be used as a raw material for pharmaceutical synthesis to help health research.
The name of p-nitroo-o-aminobenzenesulfonic acid covers its chemical structure. In its chemical structure, the nitro group is in the para-position of the benzene ring, and the amino group is adjacent to the sulfonic acid group. This name, according to chemical rules, accurately indicates the meaning, so that people in the industry can know its approximate structure after hearing its name. Its aliases, depending on regions, habits, or differences, all refer to this thing. In trade transactions, no matter what the name is, it is based on its chemical nature and makes clear what it means to avoid confusion and ensure that everything in the chemical industry goes smoothly.

Safety & Operational Standards

4 - Nitroaniline - 2 - Sulfonic Acid is a chemical substance. It is essential for its safety and operating practices to be specified.
When preparing and handling this compound, the first priority is to ventilate the environment. Because it may evaporate harmful gases, good ventilation can reduce its concentration in the air and prevent the operator from inhaling and causing damage to the body. Required ventilation equipment, such as a fume hood, and ensure its normal operation.
Furthermore, operator protection should not be ignored. Adaptive protective clothing, such as chemical protective clothing, is required to prevent it from contacting the skin. Goggles should also be worn to keep the eyes safe and protected from chemical spills. At the same time, a mask or gas mask is also indispensable, which can filter harmful gases and dust.
The operation process strictly follows the standard steps. When weighing and mixing the agent, the action should be stable and accurate to avoid the spill of the agent. If there is a spill, clean it up immediately according to a specific method to prevent pollution of the environment and cause danger. Heating or reaction link, precise temperature control and time, according to the established parameters, to ensure normal reaction and avoid accidents.
For storage, choose a dry, cool and ventilated place. Keep away from fire sources and oxidants, because it may be flammable and explosive. And it should be stored in categories, not mixed with other chemicals to prevent mutual reaction.
There are also regulations for waste disposal. It cannot be discarded at will. It needs to be collected in accordance with relevant environmental protection requirements and sent to professional institutions for processing to reduce the harm to the environment.
In short, the safety and operation specifications of 4 - Nitroaniline - 2 - Sulfonic Acid are related to personnel safety and environmental safety. When operating, you must abide by various rules and not slack.

Application Area

4 - Nitroaniline - 2 - Sulfonic Acid. It is used for dyeing, and can be used as a dye material. With its special properties, it can color the material, and the color is bright and long-lasting.
In the field of printing, it is also indispensable. The ink is used to help the print, so that the print is clear and not easy to fade.
In the way of research, it also has its own function. It can be used as a raw material for synthesizing the material, and it can help to make a cure.
It is also used in the analysis of the material, and it can be used as a dye. With the nature of the material, it can analyze its composition, and help to explain the secret of the material. All this is used for 4 - Nitroaniline - 2 - Sulfonic Acid, which is distributed in many fields and is beneficial to the world.

Research & Development

In the field of chemical industry, there is a name 4 - Nitroaniline - 2 - Sulfonic Acid, which is very important to our research. Yu and the others are trying their best to explore its properties. At first, we only knew its basic quality, but in order to understand it in detail, we need to go through many experiments.
We use a rigorous method to observe its reaction state, and observe its changes in different environments. Or adjust the temperature, or change the solvent, and record it in detail. After long-term study, we gradually know that under specific conditions, the rate of reaction and the purity of the product are different.
This study is not only to clarify its nature, but also to explore its use. Thinking about it in dyes, medicine and other industries may have extraordinary abilities. If we can make good use of its properties, we will definitely promote the prosperity of all industries. Although the road ahead is long, we hold the heart of research and hope that it will be bright in the future and contribute to the progress of chemical industry.

Toxicity Research

Today there is a thing called 4 - Nitroaniline - 2 - Sulfonic Acid, and our generation focuses on toxicity research to investigate its properties in detail. How this thing looks and smells are the beginning of research. Take an appropriate amount and place it in various media, observe its dissolution state, and know its affinity with different things.
Take animals as a test to observe their signs after ingestion. Observe whether their actions are different, whether their eating and drinking patterns have changed, and how the growth and development of the body is affected. Also explore its effect on organs, such as heart, liver, spleen, lungs, kidneys, etc., depending on whether it has damage.
Through this study, I hope to know the toxicity of 4-Nitroaniline-2-Sulfonic Acid in detail, so as to provide evidence for future application and protection, so that people can know its benefits, avoid harm and seek profit, and protect their lives.

Future Prospects

I have tasted the product of 4 - Nitroaniline - 2 - Sulfonic Acid. Viewing its nature, it has a unique quality and can be used in all fields of chemical industry.
In today's world, science and technology are changing, and chemical technology is also advancing rapidly. The future development of this product will definitely be able to bring out its brilliance. Or in the system of medicine, it is the foundation of a good prescription and helps heal diseases; or in the dyeing and weaving industry, it is the source of pigments and adds a splendid color.
Although there may be some problems at present, with time, scientific research will be able to overcome its problems. The method of preparation should be simpler and more efficient; the road of application will be more extensive and diverse. At that time, 4 - Nitroaniline - 2 - Sulfonic Acid will be the leader in the industry, leading the way forward in the chemical industry, and moving towards the future glory, so as to help all industries prosper and develop endless grandeur.

Where to Buy 4-Nitroaniline-2-Sulfonic Acid in China?

As a trusted 4-Nitroaniline-2-Sulfonic Acid manufacturer, we deliver: Factory-Direct Value: Competitive pricing with no middleman markups, tailored for bulk orders and project-scale requirements. Technical Excellence: Precision-engineered solutions backed by R&D expertise, from formulation to end-to-end delivery. Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.

Frequently Asked Questions

As a leading 4-Nitroaniline-2-Sulfonic Acid supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.

What are the main uses of 4-Nitroaniline-2-Sulfonic Acid?

4-Nitroaniline-2-sulfonic acid is one of the organic compounds. It has a wide range of uses and is commonly found in the dye industry. In the past, this compound played a key role in the field of dye preparation.
In the dye industry, 4-nitroaniline-2-sulfonic acid is often used as an important intermediate. Through a series of chemical reactions, it can be converted into a variety of colorful dyes. Its structural properties give it unique reactivity in the dye synthesis process. It can react with a variety of chemicals to construct complex dye molecules with specific colors and properties.
For example, in the preparation of some direct dyes and acidic dyes, 4-nitroaniline-2-sulfonic acid is often used as a starting material. The parent structure of the dye is gradually constructed by condensation and substitution with other compounds containing nitrogen and sulfur. Then, through further modification and processing, the color and fastness of the dye are adjusted to meet the needs of different fabric dyeing.
Furthermore, in some research and experimental scenarios, 4-nitroaniline-2-sulfonic acid can be used as a model compound to explore the mechanism of organic chemical reactions and the optimization of reaction conditions due to its unique chemical structure. In short, 4-nitroaniline-2-sulfonic acid plays an indispensable role in the industrial production and scientific research of dyes.

What are the physical properties of 4-Nitroaniline-2-Sulfonic Acid?

4-Nitroaniline-2-sulfonic acid is a kind of organic compound. Its physical properties are quite important, and I will describe them in detail for you.
Looking at its appearance, it is often in the form of white to light yellow crystalline powder. This state is easy to identify, and in many chemical scenarios, it can be used to preliminarily judge its substance. Its light color also suggests the characteristics of its chemical structure, reflecting the result of intramolecular group interactions.
On solubility, 4-nitroaniline-2-sulfonic acid is slightly soluble in water. This is due to the fact that there are both hydrophilic sulfonic acid groups in the molecule, but also hydrophobic nitro and benzene ring structures, which check and balance each other, causing it to be only slightly soluble in water. In organic solvents, its solubility is also poor, and it can only be soluble in organic solvents of specific polarities, such as dimethyl sulfoxide. This solubility characteristic has an important impact on separation, purification and choice of reaction medium.
Its melting point is also a key physical property. The melting point of 4-nitroaniline-2-sulfonic acid is quite high, which is due to the existence of various forces between molecules, such as hydrogen bonds, van der Waals forces, etc. These forces make the molecules closely aligned, and high energy is required to disintegrate their lattice structure and turn it into a liquid state. The high melting point makes it stable in solid state at room temperature and pressure, which provides certain convenience in storage and transportation.
Furthermore, the density of 4-nitroaniline-2-sulfonic acid has its specific value. Density reflects the quality of a substance per unit volume, which is crucial for material measurement and mixing ratio control in chemical production. Accurate knowledge of its density can ensure the accuracy and stability of the production process.
In addition, its smell is weak and almost odorless. This feature reduces the trouble caused by odor in practical application scenarios. Whether it is the production environment or the product use environment, it is beneficial to create a more comfortable atmosphere.
All these physical properties are interrelated and together determine the application direction and method of 4-nitroaniline-2-sulfonic acid in chemical, pharmaceutical and other fields.

4-Nitroaniline-2-Sulfonic Acid is chemically stable?

The stability of the chemical properties of 4-nitroaniline-2-sulfonic acid is related to many aspects. This substance is often the object of investigation in the field of chemistry.
In its molecular structure, the presence of nitro and sulfonic acid groups endows it with unique properties. Nitro has strong electron absorption, while sulfonic acid groups are acidic. The coexistence of the two makes the distribution of molecular electron clouds different and affects its chemical activity.
Under normal conditions, 4-nitroaniline-2-sulfonic acid is relatively stable. When it encounters special environments, such as strong acids, strong bases, high temperatures or strong oxidants, its stability is challenged.
In strong acids and bases, sulfonic acid groups or nitro groups can react. Under high temperatures, the internal energy of the molecule increases, the stability of chemical bonds is weakened, or reactions such as decomposition and rearrangement are caused. Strong oxidants can oxidize specific groups in molecules, causing changes in their structures and properties.
Therefore, the stability of 4-nitroaniline-2-sulfonic acid is not absolutely unchanged, but varies according to environmental conditions. Under normal mild conditions, it can maintain stability; however, under extreme conditions, the stability is greatly reduced, and it is prone to chemical changes.

What is the production method of 4-Nitroaniline-2-Sulfonic Acid?

The method of making 4-nitroaniline-2-sulfonic acid, the ancient chemical industry, has its own method.
One is to start with aniline. Shilling aniline and sulfuric acid are mixed to perform sulfonation. At a suitable temperature, control the temperature, so that aniline and sulfuric acid are just right to obtain aniline sulfonic acid. This step requires careful observation of temperature and response process, to prevent over-reaction or under-reaction.
Then, take the obtained aniline sulfonic acid, and meet the mixed acid composed of nitric acid and sulfuric acid, and carry out the method of nitrification. At this time, the temperature control is very important. If it is too high, the product will be impure, and if it is too low, it will be difficult to form. After nitration, 4-nitroaniline-2-sulfonic acid is obtained.
There is another method, using nitrobenzene as the initial material. First sulfonate nitrobenzene to obtain m-nitrobenzene sulfonic acid. After reduction, with suitable reducing agents, such as iron filings and hydrochloric acid, the nitro is transferred to amino group, and 4-nitroaniline-2-sulfonic acid can also be obtained. However, in this step of reduction, it is necessary to take good care of by-products such as waste acid and iron mud to avoid pollution.
All kinds of production methods have their own advantages and disadvantages. The method of starting aniline, the raw material is easy to obtain, but the control of sulfonation and nitrification requires fine; the reason for the start of nitrobenzene is the principle of by-products. Chemical craftsmen should be selected according to their circumstances, seeking high-yield, pure products and meeting environmental protection regulations.

4-Nitroaniline-2-Sulfonic Acid in storage and transportation

4-Nitroaniline-2-sulfonic acid is a chemical substance. When storing and transporting, many matters need to be taken into account.
First word storage. This substance should be placed in a cool, dry and well-ventilated place. Due to the fact that it is in a warm and humid place, its properties may change. And it should be stored in isolation from oxidants, acids, bases, etc. Due to its active chemical properties, it is prone to chemical reactions when it comes into contact with such substances, or it may cause danger, such as fire or explosion. The temperature of the warehouse should also be controlled within an appropriate range to prevent the decomposition of the substance due to excessive temperature.
As for transportation, it is necessary to ensure that the packaging is complete and sealed. Damaged packaging can easily cause leakage, endangering transportation safety and the surrounding environment. During transportation, vehicles should run smoothly, do not brake or turn sharply, and avoid packaging damage due to vibration and collision. And transportation vehicles must be equipped with corresponding emergency treatment equipment and protective equipment. In case of leakage, they can respond in time. Transportation personnel should also be familiar with the characteristics of the substance and emergency treatment methods, and can properly handle it in case of emergencies. In short, when storing and transporting 4-nitroaniline-2-sulfonic acid, it is necessary to strictly abide by relevant procedures and operate with caution to ensure safety.