Cyclohexanone is the organic compound and the carbonyl carbon atoms included in saturated cyclic ketone in the six-member ring. It’s colorless transparent liquid with earthy. When it contains trace amount of phenol, it has the flavor of mint. Impurity content is light yellow and with storage time impurities generated. In water it becomes white to yellowish gray with strong pungent odor. Mixed with air blast extremely is the same as the open chain saturated ketones. Cyclohexanone is mainly used as organic synthetic raw material and solvent in industry, for example it can dissolve cellulose nitrate and paint. 

 

Adipic acid is also known as fatty acid and is a kind of important organic dibasic acid. It can occur as salt reaction, esterification and amidation reaction. And it can be condensed into a polymer with diamine or glycol. Adipic acid is binary carboxylic acid industry of important significance in industry and also plays an important role in such aspects as chemical industry, medicine production, organic synthesis and lubricant manufacturing. Its production is in the second place in all binary carboxylic acid.

 

The main production method of adipic acid is nitric acid oxidation method which takes a mixture of cyclohexanol and cyclohexanone as raw materials,or two steps of cyclohexane oxidation. Yield and selectivity are high, but the equipment corrosion is serious. Therefore, by improving production process to develop new catalytic system, improve the reaction selectivity and the development of atom economy reaction, using non-toxic harmless raw materials under the non-toxic harmless reaction conditions to produce adipic acid is the diligent direction of the related departments of scientific research workers. Compared with the traditional oxidant, hydrogen peroxide is a kind of green oxidants and clean oxidant.

 

Here is the experiment method of sodium tungstate catalyzing cyclohexanone to synthesize of adipic acid: 30% hydrogen peroxide (H2O2) as oxidant, sodium tungstate as catalyst, clean and catalyze oxidation

cyclohexanone to synthesize adipic acid in the presence of various ligands. Early experiments in situ synthesize tungstate--organic peroxide coordination complex catalyst. Without organic solvent, the product can be obtained by simple phase separation after reaction. at the same time, because of mild reaction condition, it’s easy to operate and does not produce toxic or harmful by-products.

 

Through this method we can draw the conclusions as follows: using sodium tungstate as catalyst, acid reagent as the ligand, the reaction of sodium tungstate catalyzing cyclohexanone to synthesize of adipic acid has obtained the good effect. Its oxidation condition is mild and the reaction is easy to control. All the reaction is clean and non-pollution which conforms to the requirements of the current green synthesis.