The preparation of this product is mainly divided into two steps.
Preparation of reaction liquid
Equipped with neutral orange RL solution.
Equipped with alkaline rose essence B solution.
Mutual precipitation
Operation method
500 parts of pure water are first injected into the dissolution barrel, heated to above 95 ℃, 3 parts of NO are added and dissolved under stirring, then 7.5 parts of neutral orange RL are added, heated to boiling, until completely dissolved, and heated to a total volume of 750-800 parts. Adjust the pH value to 6.5~8 with 10% acetic acid, filter, keep warm and reserve.
Dissolve 22 parts of alkaline rose essence B in 250 parts of hot water, filter, and adjust the volume to 900 parts for later use.
Add the two batches of neutral orange RL solution prepared above into the reaction kettle, heat to 95 ℃, adjust the volume to 1600~1800 parts, and adjust the temperature to 80 ℃, I .e. add the alkaline rose essence B solution to precipitate and react with each other. The outer layer of the infiltration circle test is pink as the end point. Press and filter at about 70 ℃, rinse with 50 ℃ water, and dry the filter cake at 75 ℃.