Preparation method of dosage form flocculation decoloring agent
A technology of decolorizing agent and flocculation, which is applied in the field of preparation of one-dose flocculation decolorizing agent, can solve the problems of slow flocculation and sedimentation speed of decolorizing agent, cumbersome processing process, complicated process, etc., to improve decolorization and flocculation ability, reduce processing procedures, good effect
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[0020] A preparation method of a one-dose flocculation decolorant, comprising the following steps:
[0021] 1) Add formaldehyde solution, ammonium chloride, and urea to the reaction vessel in a weight ratio of 4:1-1.5:0.8-1.2, heat to 30-35°C, stop heating, and wait for the reaction system in the container to automatically heat up to 70-80°C After ℃, the reaction time of this step is controlled to be 0.6-1.5h, and the reaction time is calculated from the time when the three materials are added to the container;
[0022] 2) Lower the temperature of the reaction vessel to 45-55°C and add dicyandiamide, wherein the mass ratio of formaldehyde solution to dicyandiamide in step 1) is 2.8-3.5:1, and the temperature of the reaction system is raised to 70- 80℃, keep warm for 1-4h;
[0023] 3) Add water to the above system, the amount of water added accounts for 20-40% of the mass of formaldehyde solution in step 1), and then add soluble chloride salt, wherein, the mass of formaldehyde...
Embodiment 1
[0031] First add 500KG of formaldehyde solution with a concentration of 37% to the reaction kettle, then add 180KG of catalyst ammonium chloride and 139 KG of modifier urea, heat the reaction kettle while stirring continuously, stop heating after the temperature reaches 30°C, the inside of the reaction kettle is due to The temperature of the chemical reaction automatically rises to 75°C. After 1 hour of reaction, the reaction kettle is cooled to 50°C with cooling water, and 152 KG of dicyandiamide is added. The reaction heats up to 75°C. After 2 hours of heat preservation, 100 KG of deionized water is added. Continue to stir, add 30 KG each of ferrous chloride, magnesium chloride, and aluminum trichloride, add 20 KG of sulfuric acid with a mass percentage concentration of 30%, and the product obtained after completely dissolving is a high-efficiency decolorizer, and the appearance is light yellow transparent viscous liquid ,soluble in water. Take 1L of RGB red reactive dye was...
Embodiment 2
[0033] First add 500KG of formaldehyde solution with a concentration of 37% to the reaction kettle, then add 167KG of catalyst ammonium chloride and 125 KG of modifier urea, heat the reaction kettle while stirring continuously, and stop heating after the temperature reaches 35°C. The temperature of the chemical reaction automatically rises to 75°C. After 1 hour of reaction, the reactor cools down to 50°C with cooling water, then adds 167KG of dicyandiamide, and the reaction heats up to 80°C. After 1.5h of heat preservation, add 150 KG of deionized water Continue to stir, add 20 KG each of ferrous chloride, magnesium chloride, and aluminum trichloride, add 15 KG of sulfuric acid with a mass percentage concentration of 30%, and the product obtained after completely dissolving is a high-efficiency decolorizer, and the appearance is a light yellow transparent viscous liquid ,soluble in water. Take 1L of RGB red reactive dye wastewater with a chroma of 8000 times, add 10ml of the a...
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