Trisodium 4,5-Dihydroxy-3-(4-Sulphonatophenylazo)Naphthalene-2,7-Disulphonate

This is a chemical substance, the Chinese name is 4,5-dihydroxy-3- (4-sulfobenzene) naphthalene-2,7-disulfonate trisodium salt. Its chemical properties are as follows:
This compound contains sulfonic acid groups, which endow it with good water solubility. It is easy to dissociate into ionic form in aqueous solution. It can be uniformly dispersed in water due to the interaction between sulfonic acid groups and water molecules. This property makes it have important applications in many aqueous systems. The azo structure (-N = N-) in the
molecule not only gives it a specific color, but also affects the distribution and energy state of the molecular electron cloud due to the existence of the conjugated system, resulting in the absorption of specific wavelengths of light, resulting in color. This is crucial in the field of dyes and can be used to dye various types of fibers, fabrics, etc. The presence of two hydroxyl groups (-OH) increases the polarity of the molecule and enhances the ability to form hydrogen bonds with other molecules, which not only affects its solubility, but also affects its interaction with other substances containing hydrogen bond receptors or donors. In some chemical reactions or material modification, hydroxyl groups can participate in the reaction and change the structure and properties of the substance.
As a sodium salt form, it enhances the stability and solubility of the compound. In different chemical environments, sodium cations are relatively stable, and redox reactions are not easy to occur, which helps to maintain the overall structure and properties of the compound. In industrial production and practical applications, this stability ensures the reliable performance of the substance during storage and use.

This is a chemical substance called trisodium 4,5-dihydroxy-3- (4-sulfobenzene-azo) naphthalene-2,7-disulfonate. Its application field is quite wide and it is important in many industries.
In the printing and dyeing industry, this substance is often used as a reactive dye. Because of its unique chemical structure, it can chemically react with fibers to form a stable covalent bond, making dyed fabrics bright in color and excellent in fastness. It can be used for dyeing natural fibers such as cotton, linen, silk, and some synthetic fibers. It is widely used in textile printing and dyeing factories.
In the paper industry, it can be used as a paper dye. It can give paper a specific color, and because of its strong binding force with paper fibers, it is not easy to fade, ensuring that the paper color lasts for a long time. It is common in the production of various colored papers.
In the leather industry, it also has excellent performance as a leather dye. It can penetrate deep into the interior of leather to achieve uniform dyeing, improve the aesthetics of leather, and at the same time enhance the light resistance and washable properties of leather. It is widely used in the dyeing process of leather products.
In the field of ink manufacturing, this substance can be used as an ink colorant. With its good solubility and stability, it ensures smooth ink writing and bright color, and plays a key role in all kinds of writing inks and printing inks.
In summary, trisodium 4,5-dihydroxy-3- (4-sulfobenzene-azo) naphthalene-2,7-disulfonate has become an indispensable material in the printing and dyeing, papermaking, leather and ink manufacturing industries due to its unique chemical properties and properties.

This is a method for preparing Trisodium 4,5-dihydroxy-3- (4-sulfobenzene-azo) naphthalene-2,7-disulfonate. The method requires multiple steps, which are described in the ancient method as follows:
First, prepare raw materials. Take an appropriate amount of naphthalene-based compounds and choose the best quality one as the base. Then prepare the raw materials containing sulfonyl, hydroxyl, benzene-azo and other functional groups, all of which must be pure and refined, and the impurities must be removed to avoid hindering the reaction.
The second is the step of sulfonation. In a clean kettle, put the naphthalene-based raw materials and add sulfonating reagents, such as concentrated sulfuric acid. The temperature should be controlled at a suitable degree, usually between tens and hundreds of degrees Celsius, depending on the specific situation. The duration also needs to be accurate, long is excessive, short is insufficient. Sulfonation aims to introduce sulfonyl groups on the naphthalene ring to form sulfonation intermediates. The reaction needs to be observed frequently to ensure the appropriate sulfonation.
After the coupling reaction. After the sulfonation is completed, the temperature is lowered to a suitable temperature, and the phenazo-containing raw materials are slowly added. This process must be cautious to prevent overreaction. Control the pH value within a specific range and adjust it with acid-base reagents. The coupling reaction needs to be in a suitable environment to make the phenazo group connect to a specific position in the naphthalene ring and form the key structure of the target.
Then the hydroxylation reaction. After the coupling product is obtained, a hydroxyl reagent is introduced and reacted under the corresponding conditions. In this step, the temperature, duration and the proportion of reagents are also used to make the hydroxyl group accurately added to the 4,5 position of the naphthalene ring to form 4,5-dihydroxy-3- (4-sulfobenzene) naphthalene-2,7-disulfonate intermediate.
The last is a salt-forming reaction. The above intermediate is reacted with sodium base, and the amount of sodium base should be accurate, so that the intermediate is Trisodium 4,5-dihydroxy-3- (4-sulfobenzene) naphthalene-2,7-disulfonate. After the reaction is completed, it is separated and purified by methods such as crystallization, filtration, washing, etc., to remove impurities and obtain pure products.
All these steps require fine operation and precise control conditions to obtain high-quality Trisodium 4,5-dihydroxy-3- (4-sulfobenzenazo) naphthalene-2,7-disulfonate.

Wen Jun inquired about the market price range of "Trisodium 4,5 - Dihydroxy - 3 - (4 - Sulphonatophenylazo) Naphthalene - 2,7 - Disulphonate". However, this item is in the market, and its price varies for many reasons.
First, the quality has a great impact on the price. If it has high purity and few impurities, it is suitable for high-standard industrial or scientific research needs, and the price must be high; on the contrary, if it is of poor quality, the price will be low.
Second, the purchase quantity is also the key. For large purchases, due to the scale effect, the supplier may have a discount, and the unit price will be reduced; for small purchases, it is difficult to enjoy this benefit, and the price may be higher.
Third, the market supply and demand situation affects the price. The demand is strong and the supply is limited, and the price tends to rise; if the supply exceeds the demand, the price will drop.
Fourth, products from different origins have different prices due to cost differences. Advanced production areas with good technology, cost control, or price advantages.
To sum up, in order to determine the exact price range, the above factors need to be carefully considered. Generally speaking, in the general chemical market, the price may range from tens of yuan to hundreds of yuan per kilogram, but the specific still needs to consult various suppliers and compare each report to obtain the exact number.

The question I heard from you is about the environmental impact of Trisodium 4,5-dihydroxy-3- (4-sulfobenzene-azo) naphthalene-2,7-disulfonate. This compound is often used as a dye or auxiliary in industry.
Its impact on the environment is the first to involve aquatic ecology. If this substance enters the water body inadvertently, it may cause harm to aquatic organisms. Because it has certain chemical activity, or interferes with the physiological processes of aquatic organisms, such as affecting their respiration, feeding and reproduction. At high concentrations, it may pose a direct threat to the survival of fish, plankton, etc., and reduce the population.
Furthermore, the soil environment is also affected by it. If wastewater containing this compound is used for irrigation or remains in the soil, it will affect the community structure and function of soil microorganisms. Soil microorganisms are crucial in soil fertility maintenance and organic matter decomposition. If they are disturbed, the soil ecological balance will be easily damaged, resulting in a decrease in soil quality and plant growth.
In terms of atmospheric environment, although it is less likely to evaporate directly into the atmosphere, during the production process, if it is not handled properly, it may cause dust to fly, and particles containing this compound will enter the atmosphere, affecting air quality and potentially harming the human respiratory tract.
And this compound may be difficult to degrade in the environment, and the long-term accumulation is even more harmful. Or through the food chain transmission and enrichment, causing organisms at the high end of the food chain to be more affected, endangering the stability of the entire ecosystem.