IN-SITU REGENERATION OF THE COKED Y-ZEOLI TE UNDER SUPERCRITICAL CONDITIONS BY EXAMPLE OF ETHYLBENZENE DISPROPORTIONATION

In this paper the in-situ regeneration of deactivated catalyst were st udied by means of dissolving the coke or coke precursores with supercr itical reaction fluids. In a gradientless recycle reactor the kinetic investigation were performed on a zeolite-14 under supercritical condi tions with ethylbenzene disproportionation as test reaction and butane as inert component. By comparing the experimental results under super critical conditions and at normal pressure, it was found that a large power of the coke extraction exists under supercritical conditions. Th e influences of experimental conditions (temperature, pressure and fee d molar fraction) on the ethylbenzene disproportionation and the coke removal were discussed. Under optimal supercritical conditions a long time experiment over 24 h was performed in an integral reactor, it tur ns out that the above 50% conversion level of ethylbenzene can be kept during the whole experimental time.