During the production of organic pigments, the reaction between aromatic primary amines and nitrous acid (in a strong acid medium) to form diazonium salts is called diazotization.
The cis diazotization process involves first adding an appropriate amount of water to the color base, then adding a specified amount of hydrochloric acid, and slowly adding sodium nitrite under low temperature and continuous stirring to complete the diazotization reaction. The diazotization temperature is 5-10 ℃ and the time is about 10 minutes. If the reaction temperature is too high or the time is too short, good diazotization results cannot be obtained. The most ideal way for this process is to use artificial ice or cold water cooling to control the reaction temperature of the entire process.
The traditional way is to build large ice factories or purchase large ice blocks, which are manually crushed and added to reaction vessels. Due to the limitations of the production process and use of large ice blocks, the efficiency of pigment production is low, and energy consumption and labor intensity of workers are high.
SNOWKEY has developed a large-scale ice production, storage, and flexible pneumatic conveying system specifically for the cooling production process of chemical reaction vessels; The equipment has a small footprint, high energy efficiency, and can produce and store flake ice according to plan. The entire process is fully automated, with low ice temperature and fast conveying speed, reducing a large amount of labor. It has been successfully applied in a large number of similar projects both domestically and internationally.