Method for preparing high-qualityparticulate fluorescent whitening agent
A fluorescent whitening agent, granular technology, applied in the direction of bleaching products, textiles and papermaking, washing composition dyes, etc., can solve the problems of high heavy metal ion content, low product bulk density, high impurity content, etc., to achieve simple preparation method, Reduce the harm to the human body and the environment, and increase the effect of bulk density
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Embodiment 1
[0010] Embodiment 1: common type granular CXT product:
[0011] Add 1000 liters of water to the reaction kettle, add 800 kg of ice, adjust the pH to 1-3, add 100 kg of cyanuric chloride, add 300 g of cyanuric chloride, emulsify for 1 hour, and perform a shrinkage reaction at 0-10 ° C to dissolve 10% 98kg of pure DSD acid was put into the same reactor within 2 hours. After the reaction reached the end point, 48.5kg of aniline was also put into the same reactor to carry out the double shrinkage reaction. After the reaction reached the end point, the reaction material liquid was transferred In the three-shrink reaction kettle, add 50kg of morpholine in the alkaline medium, and turn the crystal at 130°C. After the crystal transformation is completed, the feed liquid is cooled and separated by pressure filtration. The obtained filter cake is beaten in a beating pot, and then used The diaphragm is pumped to the prilling tower for granulation at 250°C, and then graded and standardize...
Embodiment 2
[0013] Example 2: Improved granular CXT product:
[0014] Add 1000 liters of water to the reaction kettle, add 800 kg of ice, adjust the pH to 1-3, add 100 kg of cyanuric chloride, add 300 g of cyanuric chloride, emulsify for 1 hour, and perform a shrinkage reaction at 0-10 ° C to dissolve 10% 98kg of pure DSD acid was put into the same reactor within 2 hours. When the reaction was about to end, 25kg of ethylenediaminetetraacetic acid (EDTA) was added, and the reaction reached the end point. Then 48.5kg of aniline is also put into the same reactor to carry out the double shrinkage reaction. After the reaction reaches the end point, the reaction feed liquid is transferred to the triple shrinkage reactor. In the alkaline medium, add 50kg of morpholine and 10kg of sulfuric acid at the same time , crystallized at 130°C, after the crystallization was completed, the feed liquid was cooled, and then the feed liquid and heavy metals were separated by pressure filtration, and the obtai...
Embodiment 3
[0016] Example 3: High quality granular CXT product:
[0017] Add 1000 liters of water to the reaction kettle, add 800 kg of ice, adjust the pH to 1-3, add 100 kg of cyanuric chloride, add 300 g of cyanuric chloride, emulsify for 1 hour, and perform a shrinkage reaction at 0-10 ° C to dissolve 10% 98kg of pure DSD acid was put into the same reactor within 2 hours. When the reaction was about to end, 25kg of ethylenediaminetetraacetic acid (EDTA) was added. After the reaction reached the end, 48.5kg of aniline was also put into the same reactor. In the middle, carry out the two-shrinkage reaction, after the reaction reaches the end point, transfer the reaction feed liquid to the three-shrinkage reactor, add 50 kg of morpholine in the alkaline medium, and add 10 kg of sulfuric acid at the same time, and crystallize at 130 ° C. After the crystallization is completed, Cool the feed liquid, and then separate the feed liquid and heavy metals by pressure filtration. The obtained filt...
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