2results about How to "Reduce production pollution" patented technology

The utility model relates to the technical field of silicon material processing discloses multistage linkage type hammering crushing device for silicon material crushing, including hollow protective housing, the top rotation of hollow protective housing is connected with sealing mechanism, sealing mechanism is used for automatic to top seal, the inner wall rotation of hollow protective housing is connected with crushing mechanism, the left side fixed connection of hollow protective housing has drive mechanism, the front side fixed connection of hollow protective housing has dust extraction mechanism, sealing mechanism includes rotation axis no.

The invention discloses a method for preparing melatonin, and belongs to the technical field of drug synthesis. The method uses 5-methoxyindole and N-acetylglycine as raw materials, and prepares melatonin in a one-pot method through Friedel-Crafts acylation reaction, and obtains a melatonin competitor through recrystallization. The method for synthesizing melatonin provided by the invention avoids the low yield caused by step-by-step purification, has a short synthesis route, saves production costs and reduces pollution compared with traditional processes.