Method for preparing caprolactone from cyclohexanone by catalytic oxidation

Abstract

The invention relates to a method for preparing caprolactone through cyclohexanone catalytic oxidation. The method comprises the following steps that: raw materials, namely cyclohexanone, oxidant, solvent and catalyst, are respectively added to a reaction vessel; the reaction vessel is heated to at a temperature between 40 and 100 DEG C; constant temperature reaction is carried out for 1-15 hours; after the reaction is finished, the raw materials are cooled and separated, and then a finished product of caprolactone can be obtained, wherein the catalyst contains 50-100 percent of zinc oxide and 50-0 percent of other metallic oxide in weight percentage; the solvent is nitrile; the oxidant is hydrogen peroxide or peracetic acid. High caprolactone yield and selectivity can be obtained by adopting the method provided by the invention; meanwhile, the catalyst used in the method is low in price, easy to get and simple to prepare, contains no halogen element, has high stability, and can be used repeatedly.

Description

【Technical field】 [0001] The invention relates to the field of industrial catalysis in the petrochemical industry, in particular to a method for preparing caprolactone by catalytic oxidation of cyclohexanone. 【Background technique】 [0002] ε-caprolactone is an important organic synthesis intermediate, mainly used for the synthesis of polycaprolactone and copolymerization or blending modification with other esters; ε-caprolactone can also be used as a strong solvent to dissolve many Polymer resin, which has good solubility for some insoluble resins, such as it can dissolve chlorinated polyolefin resin and "ESTANE" polyurethane resin. Among them, polycaprolactone (PCL) is a linear aliphatic polyester obtained by ring-opening polymerization of ε-caprolactone (ε-CL). [0003] The synthesis of ε-caprolactone has difficulties in raw material quality, production safety and product stability, etc., so its synthesis technology is very difficult. At present, only a few companies in ...

AI Technical Summary

Problems solved by technology

The synthetic methods of ε-caprolactone reported in the current literature also include the use of peroxyacid oxidation, low-concentration H 2 o 2 , O 2 Air etc. are oxidant oxidation cyclohexanone to synthesize ε-lactone and biological oxidation method, but these methods have the following disadvantages: the activity of the catalyst is low, the yield and selectivity of caprolactone are poor, the catalyst is not easy to recycle, etc.