How do you convert cyclohexanone to adipic acid?
The conversion of cyclohexanone to adipic acid can be carried out using selective heteropoly compounds as catalysts. H5[α-BW12O40] catalyst convert cyclohexanone to adipic acid up to 48% while H4[α- SiW12O40] only 1%.
How does nitric acid work on cyclohexanone?
KA oil is firstly oxidized into cyclohexanone, and then cyclohexanone reacts with nitric acid to form dione which is catalytically oxidized to AA as well as a small portion of glutaric acid and succinic acid.
Which oxidation conditions are used in the industrial transformation of cyclohexanone to adipic acid?
The optimum conditions for the oxidation of cyclohexanol were 25 mg of catalyst, 120 °C, 15 bar oxygen pressure, and 8 h. Furthermore, this catalyst retained its catalytic activity with 84% conversion and 70% selectivity for adipic acid production after four cycles.
How is adipic acid produced?
Adipic acid is produced from a mixture of cyclohexanone and cyclohexanol called KA oil, the abbreviation of ketone-alcohol oil. The KA oil is oxidized with nitric acid to give adipic acid, via a multistep pathway. Related processes start from cyclohexanol, which is obtained from the hydrogenation of phenol.
How is cyclohexanone converted to adipic acid?
The product of adipic acid was characterized using GC-MS, FT-IR,1H-NMR and 13C-NMR spectroscopy. The results show that cyclohexanone could be converted into adipic acid by using H5 [α-BW12O40] H4 [α-SiW12O40] as catalysts, whereas H4 [α-PVMo11O40] did not shows catalytic activity in this reaction.
How does the oxidation of cyclohexanone take place?
The oxidation of cyclohexanone proceeds in the same way as that of cyclohexanol, provided sufficient nitrous acid is present. In the absence of HNO 2 the oxidation does not proceed at all at low temperatures.
What happens to the double bond in adipic acid?
More vigorous oxidation can result in the complete cleavage of the carbon-carbon double bond, leading to the formation of various carbonyl compounds, with the specific product dependent on the substitution pattern of the alkene and on the nature of the oxidant used.
How is adipic acid prepared from castor oil?
Adipic acid otherwise rarely occurs in nature. Nylon 6,6- a polymer of adipic acid and 1,6-diaminohexane Adipic acid was commonly obtained by oxidation of castor oil with nitric acid (splitting of the carbon chain close to the OH group), but it is also obtained by oxidation of cyclohexanone or cyclohexene.
