| Molecular Formula | C15H14ClN2O2S |
| Molar Mass | 335.8 |
| PH | 7~7.5 |
| Physical and Chemical Properties | The chemical product is a light yellow powder with reddish purple fluorescence. Melting point 218 ℃. Insoluble in water, but can be evenly dispersed in water as a stable suspension. Soluble in ethanol, N,N-dimethylformamide, ethylene glycol, ether and other organic solvents. 1% of the aqueous dispersion is neutral. It is of pyrazoline type and can be bathed with anionic, cationic and non-ionic surfactants. |
| Use | Use this product is used for whitening of white acrylic fiber and brightening of light-colored fiber. It is not suitable for the same bath with sodium chlorite bleach, but it can resist hydrogen peroxide bleach and bleach containing reducing agent. Can also be used for acetic acid and three acetic acid fiber, polyamide fiber and polyester fiber whitening treatment. Dosage is 1%~ 1.2%, |
1. Add a certain amount of water and 520kg of sulfonamide to the reactor, add hydrochloric acid, cool to 0 ℃, and then add a 30% sodium nitrite aqueous solution composed of 20kg of NaNO2. Perform diazotization for backup.
2. Dissolve 250kg of sodium bisulfite in water and adjust the pH value to 6.5-7.0. Then add the aforementioned backup solution (diazonium solution) dropwise to the reducing solution at a temperature of 20-30 ℃. After the drop is completed, raise the temperature to 80-90 ℃, react for 1 hour, and then slowly add hydrochloric acid. Bring the pH value to 1-2. After dripping, react at 90-95 ℃ for 1 hour. Cool the material to room temperature, adjust the pH value to neutral, precipitate sulfamethoxazole, filter, wash with water, and dry to obtain sulfamethoxazole.
3. Add 550kg of p-chloroacetophenone, 250kg of paraformaldehyde, and 325kg of morpholine to the condensation kettle in sequence, then add ethanol as a solvent. Under stirring, add 600kg of concentrated hydrochloric acid dropwise, gradually raise the temperature, reflux for 8 hours, let it cool overnight, filter, and wash the filter cake with a small amount of ethanol to obtain a white crystalline Mannich alkali.
4. Add the obtained chlorosulfonyl phenyl hydrazine and Mannich base to the cyclization reactor with ethanol in advance, adjust the pH value to 3-4 with hydrochloric acid under stirring, and reflux for 5 hours. Cooling, filtering, drying to obtain light yellow powder crystals, crushing to 10um. Obtain acrylic whitening agent DCB.
This product can be managed according to general industrial chemicals. When using it, gloves and protective glasses should be worn to avoid direct contact with the skin and eyes. If it gets on the skin, rinse with water and soap. Place in a cool and dry warehouse to prevent exposure to sunlight and rain.
add a certain amount of water and 520 kg of sulfonamide into the reaction kettle, add hydrochloric acid, cool to 0 ℃, then add 30% sodium nitrite aqueous solution prepared by 20kg NaNO2 for diazotization for standby.
Dissolve 250 kg of sodium bisulfite with water and adjust the pH value to 6.5~7.0. Then the above-mentioned standby liquid (diazonium liquid) is added dropwise to the reducing liquid, the temperature is maintained at 20~30 ℃, after dropping, the temperature is increased to 80~90 ℃, the reaction is 1 h, and then hydrochloric acid is slowly added dropwise. Make the pH value to 1~2. Dropping at 90~95 ℃ for 1 h. Cold the material to room temperature, adjust the pH value to neutral, so that sulfanilazine precipitation, filtration, water washing, drying, sulfanilazine.
550 kg of p-chloroacetophenone, 250 kg of paraformaldehyde and 325 kg of morpholine are sequentially added into the condensation kettle and ethanol is added as solvent. 600 kg of concentrated hydrochloric acid is added dropwise under stirring, the temperature is gradually increased, the temperature is refluxed for 8 h, the temperature is gradually increased, the temperature is refluxed for 8 h, the temperature is left to cool overnight, the filter cake is filtered and washed with a small.
The obtained chlorosulfonyl phenylhydrazine, Mannich alkali, was sequentially added into a cyclization kettle that was previously put into ethanol, and the pH value was adjusted to 3-4 with hydrochloric acid under stirring, and refluxed for 5 h. Cool, filter, dry to light yellow powder crystals, pulverize to 10 μm. Acrylic whitening agent DCB was obtained.