P-Phenylene Diamine-2,5-Disulfonic Acid

P-p-phenylenediamine-2,5-disulfonic acid, this is a chemical substance. It has a wide range of uses and is a key intermediate in the dye industry. Due to its unique structure and specific chemical activity, it can synthesize colorful dyes through various chemical reactions. To prepare azo dyes with bright color and good stability, P-p-phenylenediamine-2,5-disulfonic acid is often used as the starting material. Through diazotization, coupling and other steps, the structure of dye molecules is carefully constructed to give fabrics, leather and other materials a brilliant color.
In the field of medicine, it also has potential uses. Its chemical properties can make it participate in the synthesis of certain drug molecules. Drug developers are expected to obtain compounds with specific pharmacological activities by modifying and modifying their chemical structures. For example, it may be used to develop anti-tumor drugs by adjusting their structures so that they can precisely act on specific targets of tumor cells, thereby inhibiting the growth and proliferation of tumor cells.
In the field of materials science, it has also made a name for itself. It can be used to prepare functional polymer materials. Polymerize with other monomers to generate polymers with special properties. These polymers may have good electrical conductivity, optical properties, etc., and show broad application prospects in electronic devices, optical materials and other fields. For example, the preparation of conductive polymers can be used in flexible electronic circuits, sensors, etc., providing strong support for the development of emerging technologies.

P-Phenylene Diamine-2,5-Disulfonic Acid, Chinese name p-phenylenediamine-2,5-disulfonic acid, this substance has many physical properties. It is a solid at room temperature, and it is white to light gray crystalline in appearance. The crystal shape is regular and the texture is fine.
When it comes to solubility, it is soluble in water, and it can slowly dissociate in water, release ions, and form a uniform and stable solution. This property is due to the hydrophilicity of the sulfonic acid group in its molecular structure, which is easy to form hydrogen bonds between the sulfonic acid group and the water molecule, which prompts the substance to dissolve in water. And its solubility in hot water is higher than that in cold water. Due to the increase in temperature, the thermal movement of molecules intensifies, and it is easier to overcome the interaction between lattice energy and water molecules. The melting point of
is quite important. After accurate measurement, the melting point is in a specific temperature range. The melting point is the critical temperature at which the substance changes from solid to liquid. At this temperature, the molecule obtains enough energy to overcome the lattice binding, the lattice structure disintegrates, and the material state changes. The stability of the melting point of this substance provides a key basis for its application in many chemical production processes, which is conducive to controlling the reaction conditions and product quality.
The density of p-phenylenediamine-2,5-disulfonic acid is also an inherent property, and it has a certain mass per unit volume. This physical quantity is of great significance in the aspects of material ratio, storage and transportation. Knowing its density, it can accurately calculate the volume or mass of the substance required, ensure the accuracy of the production process, and provide important reference for the selection of storage containers and the planning of transportation space.
In addition, the substance has hygroscopicity to a certain extent. Because polar groups such as sulfonic acid groups in the molecule easily interact with water molecules in the air, water molecules are adsorbed on the surface. Hygroscopicity will affect its storage conditions, and it needs to be stored in a dry environment, otherwise it may agglomerate due to excessive moisture absorption, affecting subsequent use performance and product quality.

P-p-phenylenediamine-2,5-disulfonic acid, the chemical properties of this substance are relatively stable. Its stability comes from many aspects. From the analysis of molecular structure, the benzene ring structure has high stability. Because of the conjugation system, the electron cloud can be uniformly delocalized, which reduces the molecular energy and enhances the stability. The benzene ring in P-p-phenylenediamine-2,5-disulfonic acid is like a solid cornerstone, laying the foundation for the stability of the whole molecule.
Furthermore, the disulfonic acid group is connected to the benzene ring, and the sulfonic acid group has strong electron absorption. The conjugation effect formed by it and the benzene ring can further stabilize the electron cloud structure of the benzene ring Moreover, the sulfonic acid group itself has a high S-O bond energy, stable structure, and is difficult to break. The distribution of two sulfonic acid groups at specific positions in the benzene ring also contributes to the stability of the overall molecular configuration to a certain extent, so that the intermolecular force is maintained in a more appropriate range.
At the same time, the amino group is connected to the benzene ring, and the conjugation effect of the amino group will increase the electron cloud density of the benzene ring, but it interacts with the electron-withdrawing interaction of the sulfonic acid group. To a certain extent, it maintains the equilibrium of the molecular electron cloud distribution and avoids chemical reactions caused by excessive deviation of the electron cloud, thereby enhancing the stability of the chemical properties of the substance.
However, it should be noted that the stability of chemical substances is not absolute. Under certain extreme conditions, such as high temperature, strong acid-base, strong oxidant and other environments, the stability of P-p-phenylenediamine-2,5-disulfonic acid will be challenged, and the chemical bonds in the molecule may be broken or rearranged, causing its chemical properties to change. However, under normal temperature, pH and general chemical environment, the chemical properties of the substance are relatively stable.

The process of preparing p-phenylenediamine-2,5-disulfonic acid is very delicate. In the past, p-nitrochlorobenzene was first taken, and the sulfonation technique was used to make the sulfonic acid group enter its 2 and 5 positions, so that p-nitrochlorobenzene-2,5-disulfonic acid was obtained. This step requires strict control of the reaction temperature, time and amount of sulfonating agent to make the reaction go forward, and the yield is quite good.
Then, the nitro group is converted to amino group by reduction method. Iron powder or sulfide base is often used as reducing agent to promote the reaction in a specific acid-base environment. However, after the reduction of iron powder, the residue is not easy to dispose of and pollutes the environment; although sulfide base is slightly better than iron powder, it is also insufficient.
Today's new methods are mostly catalytic hydrogenation. Appropriate catalysts, such as palladium carbon, are selected to directly reduce p-nitrochlorobenzene-2,5-disulfonic acid to p-phenylenediamine-2,5-disulfonic acid under a certain temperature and pressure in a hydrogen atmosphere. This method is clean and efficient, the product is pure, and there is no iron sludge, which is gradually becoming more and more important in the industry.
Or there are those who start with p-phenylenediamine and obtain the target by sulfonation. It is also necessary to fine-tune the reaction conditions to ensure that the sulfonic acid group is just in the position of 2 and 5, so as to become a good product. In short, the progress of the process is to improve the yield, the quality is excellent, and the environment is good.

The price of P-p-phenylenediamine-2,5-disulfonic acid in the market varies depending on quality and quantity. If it is of high quality and pure, the price must be higher than that of regular products. If you buy in large quantities, the price may be slightly reduced; if you buy in small quantities, the price may be slightly higher.
In the past, the price of this product changed every time according to the supply and demand of the market. When there is a large number of people in need, if there is a lack of supply, the price will increase; conversely, if the supply exceeds the demand, the price will be reduced. However, today's market price is also affected by many parties, such as the price of raw materials, the new technology, the difference in taxes, and the cost of transportation.
To know the exact price, it is advisable to consult all merchants. In the chemical market, the price of each merchant may be different, and it must be compared in detail to determine the approximate price. However, roughly speaking, the price per kilogram may vary from tens of yuan to hundreds of yuan. This is only a guess, and the actual price must be determined by asking the merchants in the market.