Cyclohexanone is an important chemical raw material, widely used in fibers, synthetic rubber, industrial coatings, pharmaceuticals, pesticides, organic solvents and other industries.
Cyclohexanone is the main intermediate for the synthesis of caprolactam and adipic acid, and it is also a raw material for the preparation of spices, rubber antioxidants, adhesives, vinegar and fruit preservative phenolic phenol, and can also be used as fine chemical auxiliaries.
The traditional way to produce cyclohexanone is to produce cyclohexanol by hydrogenation of cyclohexanol, and then to reduce the cyclohexanol to the ring chamber by chemical method. There are two conventional preparation methods: One is in zinc catalyzed by 400 to 500 °C under oxidative dehydrogenation to cyclohexanone; The other was prepared by adding chromic acid catalyst with bleaching powder as oxidizing agent under weak acid condition. Among them, there is a problem, that is, there is no ideal catalyst, or the reaction conditions are harsh; or chromic acid is a toxic carcinogen, polluting the environment.
With the further study of sodium tungstate, the scholars found that the synthesis of adipic acid with cyclohexanone can be successfully catalyzed by sodium tungstate and hydrogen peroxide, scholars try again, using sodium tungstate as the main compound of hydrogen peroxide (H2O2), adding oxalic acid or phosphomolybdic acid and other acidic oxidant, made of tungstate compound catalytic agent. Through the catalysis of sodium tungstate composite catalyst, the synthesis process of the ring tunnel is quite smooth, the conclusion is that when the reaction temperature is 80 °C and the reaction time is 6h, only a small amount of tungstic acid compound catalyst mixture is used, the cyclohexanone yield is 98.2%, and the efficiency is 20% higher than the traditional chromic acid oxidizer.
Practice has proved again that sodium tungstate and hydrogen peroxide mixture can not only catalyze the synthesis of adipic acid from cyclohexanone, it also catalyzes the synthesis of cyclohexanol by cyclohexanone and may be a good catalyst for this type of chemical material, the most important thing is that sodium tungstate combined with hydrogen peroxide is not only effective, but also environmentally friendly, and can provide a better production environment for enterprises and society.
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