4-hydroxybenzene Sulfonic Acid

Lingxian Chemical

Specifications

HS Code	109397
Name	4-Hydroxybenzene sulfonic acid
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Melting Point	~280 °C (decomposes)
Acidity Pka	1.43 (for the sulfonic acid group)
Odor	Odorless
Density	~1.6 g/cm³
Stability	Stable under normal conditions, but decomposes on heating
Name	4-hydroxybenzene Sulfonic Acid
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white crystalline powder
Solubility In Water	Soluble
Melting Point	~140 - 144 °C
Acidity	Weak acid
Odor	Odorless
Density	Approx. 1.5 g/cm³
Stability	Stable under normal conditions
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white crystalline powder
Solubility In Water	Soluble
Melting Point	280 - 285 °C (decomposes)
Acidity Pka	~2.6
Density	1.55 g/cm³
Odor	Odorless
Stability	Stable under normal conditions
Cas Number	98 - 67 - 9
Name	4 - hydroxybenzenesulfonic acid
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white crystalline solid
Solubility In Water	Soluble
Pka Value	ca. 2.6
Boiling Point	Decomposes
Melting Point	148 - 150 °C
Density	1.56 g/cm³
Flash Point	Non - flammable (in solid form)
Chemical Formula	C6H6O4S
Molar Mass	174.17 g/mol
Appearance	White to off - white crystalline powder
Solubility In Water	Soluble
Ph Of Aqueous Solution	Acidic
Boiling Point	Decomposes
Melting Point	~140 - 144 °C
Odor	Odorless
Density	~1.65 g/cm³
Stability	Stable under normal conditions
Name	4-hydroxybenzene Sulfonic Acid
Molecularformula	C6H6O4S
Molarmass	174.17 g/mol
Appearance	White to off - white solid
Solubilityinwater	Soluble in water
Odor	Odorless
Ph	Acidic
Meltingpoint	~150 - 155 °C
Boilingpoint	Decomposes before boiling
Stability	Stable under normal conditions
Hazardclass	Irritant (to skin, eyes, etc.)
Name	4-hydroxybenzene Sulfonic Acid
Molecular Formula	C6H6O4S
Molar Mass	174.17 g/mol
Appearance	White to off - white solid
Odor	Odorless
Solubility In Water	Soluble
Ph	Acidic
Melting Point	~130 - 135 °C
Boiling Point	Decomposes before boiling
Stability	Stable under normal conditions
Chemical Formula	C6H6O4S
Molar Mass	174.17 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Melting Point	140 - 144 °C
Boiling Point	Decomposes
Acidity Pka	Around 2.6
Odor	Odorless
Density	Approx. 1.65 g/cm³
Stability	Stable under normal conditions
Name	4 - hydroxybenzene Sulfonic Acid
Molecular Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Acidic Nature	Weak acid
Melting Point	~300 °C (decomposes)
Odor	Odorless
Pka Value	Around 2.6
Stability	Stable under normal conditions
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to light brown solid
Solubility In Water	Soluble
Pka Value	around 2.6
Melting Point	148 - 150 °C
Boiling Point	Decomposes
Density	1.56 g/cm³ (approximate)
Odor	Odorless
Ph Of Aqueous Solution	Acidic
Name	4-hydroxybenzene Sulfonic Acid
Molecularformula	C6H6O4S
Molarmass	174.174 g/mol
Appearance	White to off - white solid
Solubilityinwater	Soluble
Acidicnature	Weakly acidic
Meltingpoint	130 - 135 °C
Boilingpoint	Decomposes before boiling
Odor	Odorless
Density	Approx. 1.65 g/cm³
Stability	Stable under normal conditions
Name	4 - hydroxybenzene Sulfonic Acid
Chemical Formula	C6H6O4S
Molar Mass	174.17 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Melting Point	280 - 285 °C
Boiling Point	Decomposes
Pka Value	ca. 3.2
Density	1.55 g/cm³
Odor	Odorless
Stability	Stable under normal conditions
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to light - yellow crystalline solid
Solubility In Water	Soluble
Pka Value	Around 2.6
Melting Point	148 - 150 °C
Boiling Point	Decomposes before boiling
Density	1.509 g/cm³
Odor	Odorless
Flash Point	Non - flammable
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Melting Point	155 - 157 °C
Pka Value	ca. 0.98
Odor	Odorless
Density	1.65 g/cm³
Flash Point	Non - flammable
Stability	Stable under normal conditions
Name	4-hydroxybenzene Sulfonic Acid
Molecular Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Acidic Nature	Weakly acidic
Melting Point	~280 - 300 °C (decomposes)
Odor	Odorless
Stability	Stable under normal conditions
Flash Point	Non - flammable
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white crystalline powder
Solubility In Water	Soluble
Ph Of Aqueous Solution	Acidic
Melting Point	~140 - 144 °C
Boiling Point	Decomposes before boiling
Density	1.65 g/cm³
Odor	Odorless
Stability	Stable under normal conditions
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white crystalline powder
Solubility In Water	Soluble
Odor	Odorless
Melting Point	280 - 285 °C (decomposes)
Acidity	Weak acid
Density	1.65 g/cm³
Stability	Stable under normal conditions
Cas Number	98 - 67 - 9
Chemical Formula	C6H6O4S
Molar Mass	174.174 g/mol
Appearance	White to off - white solid
Solubility In Water	Soluble
Odor	Odorless
Melting Point	~150 - 155 °C
Pka Value	1.09 (first dissociation)
Density	1.51 g/cm³
Ph Of Aqueous Solution	Acidic
Stability	Stable under normal conditions

Packing & Storage

Packing	500g of 4 - hydroxybenzene Sulfonic Acid packaged in a sealed plastic bag.
Storage	4 - hydroxybenzene sulfonic acid should be stored in a cool, dry, well - ventilated area, away from heat sources and open flames. Keep it in tightly sealed containers to prevent moisture absorption and exposure to air, which could lead to chemical reactions. Store it separately from incompatible substances like strong oxidizers and bases to avoid potential hazards.
Shipping	4 - hydroxybenzene Sulfonic Acid should be shipped in well - sealed, corrosion - resistant containers. It must be transported in accordance with hazardous chemical regulations, ensuring proper ventilation and separation from incompatible substances.

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General Information

Frequently Asked Questions

What are the main uses of 4-hydroxybenzene Sulfonic Acid?

4-Hydroxybenzenesulfonic acid has a wide range of uses. In the industrial field, it is often used as an intermediary in organic synthesis. This compound can be used to prepare many important organic products, such as certain drugs, dyes and fragrances. In the preparation of drugs, 4-Hydroxybenzenesulfonic acid can become a key structural unit for synthesizing drug molecules through specific chemical reactions, and plays a crucial role in the efficacy of drugs.
In the field of dye manufacturing, it can be used as an important raw material to participate in the construction of dye molecules, endowing dyes with specific color and stability, so that dyes can better adhere to fabrics during printing and dyeing, and are not easy to fade.
In fragrance synthesis, 4-hydroxybenzenesulfonic acid can also play a role in assisting in the construction of the specific structure of fragrance molecules, giving the fragrance a unique aroma.
In addition, 4-hydroxybenzenesulfonic acid is also used in the preparation of surfactants. Surfactants are widely used in detergents, emulsifiers and other products. 4-hydroxybenzenesulfonic acid can be chemically reacted to become a part of the molecular structure of surfactants, enabling it to reduce the surface tension of liquids, thereby achieving functions such as cleaning and emulsification.
Furthermore, in some catalytic reactions, 4-hydroxybenzenesulfonic acid, due to its specific chemical structure, can play a catalytic role, accelerate the reaction process, improve the reaction efficiency, and reduce the energy conditions required for the reaction, which is of great significance to many chemical industrial production processes.
In summary, 4-hydroxybenzenesulfonic acid plays an important role in many fields such as organic synthesis, drugs, dyes, fragrances, surfactants, and catalytic reactions, and has a wide impact on industrial production and people's daily lives.

What are the Physical Properties of 4-Hydroxybenzene Sulfonic Acid

4-Hydroxybenzenesulfonic acid is one of the organic compounds. Its physical properties are quite unique, and its understanding is of great significance in the chemical industry.
Looking at its appearance, under room temperature and pressure, 4-Hydroxybenzenesulfonic acid is often in the state of white to light yellow crystalline powder. This form makes it easy to handle and measure in many reactions and applications. Its texture is fine, and the powder is easy to mix with other substances, which facilitates the development of chemical reactions.
In terms of solubility, 4-Hydroxybenzenesulfonic acid has good water solubility. Water can easily dissolve it, which makes it widely used in reactions in aqueous solutions. When dissolved in water, the substance can be uniformly dispersed in the form of ions, which is conducive to participating in various ionic reactions and also helps to improve the reaction rate and efficiency.
Melting point is also one of its important physical properties. The melting point of 4-hydroxybenzenesulfonic acid is within a specific range, which has a great impact on its separation, purification and storage. Knowing the melting point, it can be purified by controlling the temperature and using recrystallization to obtain high-purity products. At the same time, when storing, it is also necessary to choose suitable temperature conditions according to the properties such as melting point to ensure its stability.
Furthermore, 4-hydroxybenzenesulfonic acid has a certain degree of hygroscopicity. Because there are groups in its structure that can interact with water molecules, it is easy to absorb water from the air. This hygroscopicity requires special attention during storage and use. If the humidity of the storage environment is improper, or the water content changes, its chemical properties and use effect will be affected.
In summary, the physical properties of 4-hydroxybenzenesulfonic acid such as white to light yellow crystalline powder appearance, good water solubility, specific melting point and hygroscopicity have far-reaching effects on its application in chemical synthesis, pharmaceutical research and development, material preparation and other fields. Users need to be familiar with and make good use of these properties in order to maximize the effectiveness of the substance in various fields.

Chemical Properties of 4-Hydroxybenzene Sulfonic Acid

4-Hydroxybenzenesulfonic acid is an organic compound. Its properties are both hydroxy and sulfonic acid groups.
First, the sulfonic acid group is strongly acidic, and it is easy to ionize hydrogen ions in water, making the substance acidic and can neutralize with bases. For example, it interacts with sodium hydroxide to generate 4-hydroxybenzenesulfonic acid and water. This reaction is like the combination of strong acids and strong bases. The acid and base are mixed together, each showing its own characteristics and converting to each other.
Furthermore, the presence of hydroxyl groups gives it unique activity. The hydroxyl group can participate in the esterification reaction. In the case of carboxylic acid or its derivatives, under suitable conditions, the hydrogen atom in the hydroxyl group and the hydroxyl group in the carboxylic acid combine to form water, and the rest of the two are connected to form an ester. This process is like a delicate chemical "puzzle", and the parts are spliced according to specific rules.
At the same time, the benzene ring structure of 4-hydroxybenzene sulfonic acid also has an important influence. The benzene ring has a conjugated system and its properties are relatively stable, but it can also undergo substitution reactions. Because both the hydroxyl group and the sulfonic acid group are ortho-sites, electrophilic substitution reactions mostly occur in the ortho-sites of the hydroxyl group and the sulfonic acid group. For example, when interacting with halogenating agents, halogen atoms can replace hydrogen atoms in the ortho-sites of the benzene ring. This reaction
In addition, due to the presence of hydroxyl groups in the molecule, hydrogen bonds can be formed between molecules, which has a significant impact on their physical properties. For example, the melting boiling point will increase compared to similar compounds without hydrogen bonds, and the solubility in water may also increase due to the interaction between hydrogen bonds and water molecules. Just like hydrogen bonds build an invisible "bridge" between molecules to enhance their connection.

What is the production method of 4-hydroxybenzene Sulfonic Acid?

The preparation method of 4-hydroxybenzenesulfonic acid is based on the method of chemical synthesis in the past. The commonly used method is to use p-hydroxybenzoic acid and fuming sulfuric acid as raw materials.
First take an appropriate amount of p-hydroxybenzoic acid and place it in a special reactor. The kettle needs to be cast with a strong acid-resistant material to prevent acid attack. Then slowly add fuming sulfuric acid. This process needs to be extremely careful, because fuming sulfuric acid is highly corrosive and has strong chemical reaction activity. When adding, control its rate to prevent overreaction.
Add it up and raise the temperature of the reactor, but the temperature should not be too high. Usually maintain it within a specific range, about a suitable temperature range. This is determined by repeated tests and experience. At this temperature, a chemical reaction occurs between the two. During the reaction, the molecular structure in the kettle is rearranged and combined. After a series of complex chemical changes, the structure of hydroxybenzoic acid is gradually reversed, and the sulfonic acid group is cleverly connected to the benzene ring, resulting in 4-hydroxybenzene sulfonic acid.
After the reaction is completed, the product in the kettle is poured out, which often requires multiple subsequent treatment steps. The first step is neutralization. A moderate alkaline substance, such as sodium carbonate solution, is slowly added to the product to make the pH of the system tend to be neutral. This step aims to remove excess acid and form a salt that is easy to separate.
After neutralization, the resulting precipitate impurities are filtered out by filtration. The filtrate is evaporated and concentrated, so that the water in the solution gradually loses, and the concentration of 4-hydroxybenzenesulfonic acid gradually increases. When the solution is cooled to a certain extent, 4-hydroxybenzenesulfonic acid crystallizes and precipitates. After centrifugation, a relatively pure 4-hydroxybenzenesulfonic acid crystal can be obtained. Finally, the residual water on the surface of the crystal is removed by low temperature drying to obtain the finished product.

What are the precautions for 4-hydroxybenzene Sulfonic Acid during use?

4-Hydroxybenzenesulfonic acid, in chemical operation, need to pay attention to many key matters.
First safety protection. Because of its corrosive nature, contact can easily cause skin and eye burns. During operation, be sure to wear complete protective equipment, such as acid and alkali resistant gloves, protective glasses and protective clothing, etc., to prevent accidental contamination. If the skin is inadvertently touched, rinse with a lot of water immediately, and then seek medical treatment; if it splashes into the eyes, rinse with a lot of water immediately, and seek professional medical assistance quickly.
Furthermore, pay attention to the reaction conditions. When 4-hydroxybenzenesulfonic acid participates in the reaction, factors such as temperature, pH and reaction time have a significant impact on the reaction process and product purity. For example, a specific reaction requires to be carried out within a strict temperature range. If the temperature is too high, or side reactions increase, the purity of the product will decrease; if the temperature is too low, the reaction rate will be slow and time-consuming. Or some reactions have strict requirements on pH, and it is necessary to precisely control the pH of the system with the help of acid-base regulators to ensure the smooth progress of the reaction.
Storage should not be ignored. It should be placed in a cool, dry and well-ventilated place, away from fire and heat sources. Because of its hygroscopicity, moisture can easily affect the quality and performance. At the same time, it should be stored separately from oxidants, alkalis and other substances to avoid dangerous reactions. The storage area should also be equipped with suitable containment materials to prevent leakage accidents.
Ventilation conditions during operation are also critical. Due to the fact that irritating gases may be volatilized during certain operations, good ventilation can discharge harmful gases in time, reduce the risk of inhalation by operators, and ensure the safety of the working environment.
When taking 4-hydroxybenzenesulfonic acid, be sure to follow the exact dosage to avoid waste and excessive input causing adverse consequences. Weighing instruments need to be accurately calibrated to ensure accurate dosage. Be careful in the transfer and addition process to prevent spillage.
In chemical operations, careful control of all points of attention to 4-hydroxybenzenesulfonic acid can ensure safe and efficient operation, and ensure personnel safety and smooth production.