Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-I-22INFLUENCE OF ORGANIC HELATES ON THE OXIDIZATIONPROCESS OF CYCLOHEXANEMudryy S.O., Reutskyy V.V., Ivashchuk O.S.National University «Lvivs’ka Polytechnika», Institute of Chemistry and ChemicalTechnology, Department of Technology of Organic Products,Ukraine, Lviv, 12, St. Bandery str., e-mail: ivaschuk@polynet.lviv.uaBy the reactions of oxidization in industry get a lot of organic substances. For providingof high-rate reactions use the catalysts. The main problem in industrial process is very lowconversion of cyclohexane.Process of oxidization of cyclohexane in presence helates and naftenate of cobalt isinvestigated at 418K and pressure of 1 MPa. The duration of reaction is about 60 min. Theconcentration of basic catalyst (cobalt naftenate (CN)) is about 10-5 ÷ 10-4 mol/l.It is known that these catalysts strongly influence on speed of the process, but practicallydoes not influence on composition of reactionary mixture.Use as catalyst cobalt soluble helate (CSH) allowed to attain in times of identical reactionof conversion more high on 40%, than at the use of cobalt naftenate, and selectivity a purposeproducts remained without changes.Process in present of catalysts cobalt insoluble helate (CIH) and cobalt pirazol polichelat(CPP) results in a growth speed of oxidization a cyclohexane. Thus, if the use of CPP resultsin the insignificant growth of conversion which is arrived at in times of identical –approximately on 10%, application of CIH results in a growth conversion practically in 5times. Alike results are observed on influence of these catalysts CIH and CPP on totalselectivity after having a special purpose products: use of CPP provides the same selectivitypractically, as well as in presence the CN, and here the use of CIH does not allow even atconversion of cyclohexane to 1% to attain selectivity more high after 80%.Use cobalt helates catalyst does not change substantially the ratio of purpose products –cyclohexanol (CHL) and cyclohexanone (CHN). At conversion of cyclohexane approximately4% it is within the limits of 1,5-1,9. Use the catalyst CIH results in some decline of thiscorrelation (0,7 comparatively with 1,6 at the use cobalt naftenate), but such result it isattained only at conversion of cyclohexane to 1%, so as on this catalyst, attaining higherconversion of cyclohexane was not succeeded.Taking into account the structure of investigational catalysts, it is possible to draw aconclusion, that increase of oxidization speed at application of catalyst CSH, which isespecially notedly observed on the initial stage of reaction, can be caused being in thestructure of him ligand of peroxide groups which are initiator of oxidization process.Therefore, is perspective to continue research in this direction.252