C.I. Direct Red 13, Disodium Salt (8Ci)Disodium 4-Amino-3-[(E)-(4'-{2-[(2E)-2-Imino-8-Oxo-6-Sulfonato-2,8-Dihydronaphthalen-1-Yl]Hydrazino}Biphenyl-4-Yl)Diazenyl]Naphthalene-1-Sulfonate

C.I. Direct Red 13, disodium salt (8Ci), this is an important chemical substance. Its main use is quite extensive, in the dyeing and weaving industry, often used as a fabric dyeing agent. Because of its good dyeing properties, it can make the fabric appear bright and long-lasting red, so it is very popular in the field of textile printing and dyeing. After dyeing the fabric, it has a brilliant color and is not easy to fade, which can meet the high requirements of various fabrics for color.
In the paper industry, C.I. Direct Red 13, disodium salt (8Ci) is also useful. It can be used for paper dyeing, giving paper a unique red hue, improving the visual effect of paper, and applied to the production of specific types of paper, such as art paper, decorative paper, etc., to add the aesthetics and uniqueness of paper.
Furthermore, in leather processing, it can also be used to dye leather. The dyed leather is full of color and excellent texture, enhancing the market competitiveness of leather products and meeting the needs of the leather products industry for color richness. In short, C.I. Direct Red 13, Disodium Salt (8Ci) in dyeing, papermaking, leather and other industries, with its excellent dyeing properties, plays an indispensable role in adding color to products in various industries.

C.I. Direct red 13, disodium salt (8Ci), used in various industries in different situations. In the dyeing and weaving industry, its color is fresh and firm, and it is often colored for fabrics, so that the cloth is bright red, and the color does not fade for a long time. It can dye cotton, hemp, silk and other fibers into colorful fabrics.
In the paper industry, it is also used. It can give paper a unique red color, or add color to decorative paper, or be used for specific types of paper to make its appearance more distinctive and improve the visual effect of paper products.
In the leather dyeing industry, C.I. direct red 13, disodium salt (8Ci) can make the leather with bright red, enhance the beauty of the leather, and help the leather color uniform, improve the quality and commercial value of leather products.
However, when using it, it is necessary to precisely control the dosage and process conditions according to industry specifications and product requirements. Too much dosage may cause too deep color and inappropriate; improper process, or affect the dyeing effect, such as uneven, poor fastness, etc. Therefore, each industry uses this dye carefully according to its own characteristics to achieve the best effect and become a fine product.

C.I. Direct Red 13, Disodium Salt (8Ci) This substance has a lot of potential effects on human health. It may be toxic. After exposure, mild ones can cause skin discomfort, such as itching, redness and swelling, and severe ones can damage internal organs. Long-term exposure to the environment containing this substance, respiratory tract or irritation, can cause cough, asthma, and even more, or increase the risk of lung diseases.
Furthermore, it may be carcinogenic. Although the exact evidence is not sufficient, relevant studies suggest that its chemical structure is similar to some carcinogens, and long-term exposure may increase the risk of cancer. And if the substance is ingested orally, it may interfere with the normal physiological functions of the human body, affect the digestive system, and cause nausea, vomiting, and abdominal pain.
In addition, C.I. direct red 13, if disodium salt enters the water source, is ingested through drinking water, or accumulates in the body, it will damage the liver and kidney and other detoxification organs, resulting in abnormal function. Its residue in the environment, or passed through the food chain, indirectly affects human health. Therefore, for such substances, be careful and try to avoid contact to prevent them from endangering health.

C.I. Direct Red 13, The stability of disodium salt (8Ci) in the environment needs to be considered from a variety of factors.
The chemical structure of this substance has a great impact on its stability. The strength and type of chemical bonds in its structure determine its reactivity under different environmental conditions. If the chemical bond is stable, it is more difficult to be destroyed by external factors, and the stability is good; conversely, if the chemical bond is easy to break, it is easy to change in the environment.
Temperature is also a key factor. Under high temperature, the molecular movement intensifies, the chemical reaction rate accelerates, or the substance decomposes and deteriorates. If it is in a low temperature environment, the molecular movement slows down and the chemical reaction is also inhibited, and the stability may be improved.
Furthermore, the effect of pH (pH) should not be underestimated. In acidic or alkaline environments, the substance may chemically react with acid and alkali, resulting in structural changes and impaired stability. In neutral or near-neutral environments, it is less affected by pH and has relatively high stability.
Light conditions also play a role. After some compounds are irradiated, they absorb light energy and excite, triggering photochemical reactions and causing structural changes. If C.I. direct red 13 disodium salt is sensitive to light, the stability will be reduced under light.
In addition, the presence of other substances in the environment or chemical reactions with the substance affect its stability. Such as oxidizing or reducing substances, or triggering oxidation-reduction reactions, changing their chemical forms.
In summary, the stability of C.I. Direct Red 13, disodium salt (8Ci) in the environment depends on many factors such as chemical structure, temperature, pH, light and surrounding substances. All factors are intertwined to affect its stability in the environment.

To prepare C.I. direct red 13, disodium salt (8Ci), this is a priority for fine chemical synthesis. The production process has three key steps.
The first is raw material pretreatment. Select high-quality aromatic amine compounds, such as p-aminoazobenzene, which need to be purified by distillation, recrystallization, etc., to ensure that the purity is above 99%. This is the basis for the smooth subsequent reaction. Due to the presence of impurities in the raw material, or the skewing of the reaction, the product is impure.
The second is a coupling reaction. In an appropriate reactor, control low temperature, generally 5-10 ° C, and mix the diazonated aromatic amine with a specific naphthol derivative. The diazotization reaction requires precise preparation of the amount of sodium nitrite and acid to ensure the stable formation of diazonium salts. When coupling, the stirring rate is also critical. The materials must be uniformly mixed to promote the efficient progress of the reaction, generate key intermediates, and lay the foundation of the product structure.
The other is salting out and refining. After the reaction is completed, the temperature is cooled to room temperature, and an appropriate amount of sodium chloride is added to salting out to precipitate the product. After that, it is filtered and washed to remove impurities. Then it is recrystallized with an organic solvent, such as ethanol, acetone, etc., to further improve the purity. After the drying process, high-purity C.I. direct red 13, disodium salt (8Ci), and its color, stability and other indicators are all up to the excellent standard.