Method for co-production of carboxylic acid and epsilon-caprolactone based on aerobic oxidation
AssigneeZhejiang University
InventorsShengming Ma, Jinxian Liu
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Abstract
The present invention discloses a newly high-efficiency method for co-production of carboxylic acid and ε-caprolactone based on the aerobic oxidation, that is, under the developed catalytic system, the aldehyde is oxidized to corresponding carboxylic acid while cyclohexanone is oxidized to ε-caprolactone, realizes the co-production of carboxylic acid and ε-caprolactone. The salient features of this method include the use of cheap and readily available substrates, mild reaction conditions, environmentally friendly, and easy operation. It can realize the co-production of carboxylic acid and high value-added ε-caprolactone.
Claims6
A method for co-production of carboxylic acid and ε-caprolactone based on aerobic oxidation, wherein, in the presence of oxygen, an aldehyde solution is added to a catalyst, organic solvent and cyclohexanone;
- the resulting mixture is stirred until the completion of the reaction, then the ε-caprolactone and carboxylic acid are obtained by column chromatography or distillation, and the reaction equation is shown in the following equation (A):
- wherein, R is a C2-C4 linear or branched alkyl group;
- the catalyst is selected from one or both of ferric nitrate nonahydrate and copper nitrate trihydrate;
- a reaction temperature is from room temperature to 50° C.;
- and
- the molar ratio of the aldehyde, cyclohexanone and catalyst is 250˜300:100:1˜10.
Dependencies are inferred from the claim text.