Our product, High Quality Sulphanilic acid CAS 121 - 57 - 3 With Good Price, is a high - grade chemical compound. The CAS number 121 - 57 - 3 is a unique identifier for this substance, which ensures its proper identification in the chemical industry. Its chemical formula is C₆H₇NO₃S. It appears as a white to slightly reddish - brown crystalline powder.
In terms of purity, our sulphanilic acid has a very high purity rate, usually exceeding 98%. This high purity makes it suitable for a variety of applications where precision and quality are crucial. The melting point of sulphanilic acid is around 288 - 290°C (decomposes). It is slightly soluble in cold water but more soluble in hot water. It is also soluble in alkaline solutions.
1. **Dye and Pigment Industry**: Sulphanilic acid is an important intermediate in the production of dyes. It can be used to synthesize a wide range of azo dyes, which are known for their bright colors and good fastness properties. These dyes are used in the textile industry to color fabrics, as well as in the paper and leather industries.
2. **Pharmaceutical Industry**: In the pharmaceutical field, it can serve as a raw material for the synthesis of some drugs. It plays a role in the production of certain antibacterial and antipyretic drugs due to its chemical reactivity and structure.
3. **Analytical Chemistry**: It is used as a reagent in analytical chemistry. For example, it can be used in the determination of nitrite in water samples. The reaction between sulphanilic acid and nitrite under specific conditions can produce a colored compound, which can be measured spectrophotometrically to determine the concentration of nitrite.
1. **Handling Precautions**: When handling sulphanilic acid, it is necessary to wear appropriate personal protective equipment, such as gloves and goggles. Avoid inhalation of dust and contact with skin and eyes. In case of contact, immediately rinse with plenty of water and seek medical advice if necessary.
2. **Dissolving in Water**: If you need to dissolve sulphanilic acid in water, it is recommended to use hot water for better solubility. Stir the solution gently to ensure complete dissolution. The solution should be prepared in a well - ventilated area.
3. **Chemical Reactions**: When using sulphanilic acid in chemical reactions, strictly follow the reaction conditions and procedures. For example, in the synthesis of dyes, control the reaction temperature, pH value, and the amount of reactants accurately to ensure the quality of the final product.
**Case 1: Textile Dyeing**
A textile factory needed to produce a batch of bright - colored cotton fabrics. They used our sulphanilic acid as an intermediate to synthesize an azo dye. First, they dissolved sulphanilic acid in hot water and then carried out a diazotization reaction under controlled conditions. After that, they coupled the diazonium salt with a suitable coupling agent. The resulting dye was used to dye the cotton fabrics. The dyed fabrics showed excellent color fastness and bright colors, meeting the high - quality requirements of the market. The factory was able to increase its product competitiveness and sales volume.
**Case 2: Nitrite Detection in Water**
A water treatment plant needed to monitor the nitrite content in the water supply. They used sulphanilic acid as a reagent in the analytical procedure. They took a water sample, added a specific amount of sulphanilic acid solution and other necessary reagents. After a certain reaction time, they measured the absorbance of the solution using a spectrophotometer. Based on the calibration curve, they accurately determined the nitrite concentration in the water. This helped the water treatment plant to take appropriate measures to ensure the safety of the water supply.
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This is William, CEO of Zhishang Chemical Co., Ltd.
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