Clean Oxidation Of Cyclohexene To Adipic Acid By Hydrogen Peroxide

Adipic acid is a most important organic synthetic intermediate and can be applied widely. Much attention has been paid for its green synthesis process because of disadvantages in current technology. In this thesis,H2O2 was used as oxidant in the synthesis of adipic acid from cyclohexene, and the following aspects of research works were mainly carried out:1. The glycine phosphotungstate was prepared, and was characterized by FT-IR, TG-DSC, and elementary analysis. The complex was an effective catalyst in the oxidation of cyclohexene to adipic acid under mild condition in high yield of 95.1% and excellent selectivity of 99.8%. The pH value of the reaction system had a significant effect on the yield of adipic acid, and the yield of adipic acid increased with the decrease of pH value.2. Based on the cyclohexene-H2O2 reaction system, a series of bifunctional surfactant-type peroxotungstates were synthesized with sodium tungstate and surfactants such as dodecyl trimethyl ammonium bromides, and as-synthetic catalysts were characterized by FT-IR spectroscopy, TG-DSC and elementary analysis. Their catalytic properties were studied, and the experimental results showed that the catalysts exhibited high catalytic activites in the oxidation of cyclohexene to adipic acid with 30% H2O2 under organic solvent- and cocatalyst-free conditions.3. The supported catalyst PW/SiO2 was prepared. Experimental results of characterization techniques and catalysis reactions showed that the ultrasonic dispersion was better than any other selected method, and the best HPW loading amount is 40%. The catalyst exhibited good activity in the synthesis of adipic acid.4. A method for simultaneous determination four organic acids by reversed-phase high performance liquid chromatography was developed. The pH of mobile phase was controlled by buffer solution to keep the dicarboxylic acid nonionized. Both the product and the byproducts in the mother liquor were analysized using this method.