Chemical materials are reacted under certain temperature, pressure and other conditions to achieve the required conversion rate and yield of the reaction. In chemical processes such as oxidation, reduction, metathesis, vulcanization, isomerization, polymerization, separation, etc., it is often necessary to maintain a precise specified temperature during operation to ensure the progress of the process and the stability of the product. For example, in the process of potassium chloride crystallization, cooling crystallization is a very important process. The use of refrigeration chillers can effectively increase the output and ensure product stability.