| Molecular Formula | C32H26N12Na28S2 |
| Molar Mass | 784 |
| Physical and Chemical Properties | The chemical product is a light yellow powder. Soluble in water, the aqueous solution is blue fluorescent. The spectral absorption wavelength is 344 nm and the fluorescence emission wavelength is 432 nm. It is anionic. It can be used in the same bath with anionic surfactants, dyes and non-ionic surfactants. |
| Use | This product is used for cotton fiber, rayon, rayon, pulp fiber and other neutral bath whitening treatment, also used in synthetic detergent. |
1. Add 1500kg crushed ice water to the condensation reaction kettle and adjust the pH value with hydrochloric acid until the Congo red test paper turns slightly red. Then add 141kg of melamine and stir well. Prepare 139kg of DSD acid into a 10% aqueous solution and adjust the pH value to 6-7 with soda ash. Then add the DSD sodium salt solution dropwise to the aforementioned melamine solution, and adjust the pH value to 5-6 at any time with 10% pure alkali. After dripping, continue stirring for 1 hour until the amino group disappears, reaching the endpoint. Then add 140kg of 20% ammonia water for the second condensation, and adjust the pH value to 7-8 with 10% soda ash. React at 40 ℃ for another 2 hours. Then add 78.5kg of aniline and 62.0kg of sodium bicarbonate, and stir at 85 ℃ for about 1.5 hours. Maintain a pH value of 6-7. Finally, add 70kg of 20% ammonia water, continue to heat up to 110 ℃, and react for 2 hours.
2. Filter the above condensation reaction solution while it is hot, cool it to 90 ℃, and add hydrochloric acid to adjust the pH value to 2-2.5. Cooling, crystallization, kneading filter cake with alkali, drying, crushing, and mixing with 604kg of sodium sulfate to obtain 1000kg of fluorescent whitening agent RA finished product.
This product can be used according to general industrial chemical management. Gloves and protective glasses should be worn to avoid direct contact with the skin and eyes. If it comes into contact with the skin, rinse it with water and soap, and place it in a cool and dry warehouse to prevent exposure to sunlight and rain.
add 1 500 kg of crushed ice water into the condensation reactor, and adjust the pH value to Congo red test paper with hydrochloric acid. Then add 141 kg of cyanogen trioxide and stir well. In addition, 139kg DSD acid is prepared into a 10% aqueous solution, and the pH value is adjusted to 6-7 with soda ash. Then the sodium salt of DSD acid aqueous solution is added dropwise to the cyanuric chloride, and the pH value is adjusted to 5~6 with 10% soda ash at any time. After dropping, continue stirring for 1 h, and the end point will be reached when the amino group disappears. Then add 140kg 20% ammonia for the second condensation, and adjust the pH value to 7-8 with 10% soda ash. Then react at 40 ℃ for 2 h. Then 78.5kg aniline and 62.0kg sodium bicarbonate were added and stirred at 85 ℃ for about 1.5 h. Keep the pH value at 6~7. Finally, add 70kg 20% ammonia water, continue to raise the temperature to 110 ℃, and react for 2 h.
The above condensation reaction solution is filtered while hot, and the temperature is reduced to 90 ℃ and hydrochloric acid is added to adjust the pH value to 2~2.5. Cooling, crystallization, kneading the filter cake with alkali, drying, crushing, and mixing with 604 kg of sodium sulfate to obtain 1,000kg of fluorescent whitening agent RA finished product.