The ketorenazone method, also known as Bergbau-Bayer-Whiffen method, was developed in the 1960s. It was first patented by Bergbau-Farsching, a subsidiary of the German Coal Mining Association. The process was improved by Bayer and Whiffen & Sons. Respectively, in the mid 1970s, large-scale industrialization and rapid development, is actually an improvement of the original Lacey law.
The main industrial production methods of hydrazine hydrate are laxi method, urea method, ketone nitrogen method and hydrogen peroxide method. The urea process is mainly used in China. 1. Urea oxidation method Mix 10% sodium hypochlorite solution with 30% liquid alkali, then cool, adjust the mix