METHOD OF CATALYST REGENERATION Russian patent published in 2014 - IPC B01J38/30 B01J38/34 B01J38/12 B01J38/16 B01J38/18 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of catalyst regeneration. First claimed method of regeneration is characterised by the fact that spent catalyst from reactor is introduced into first regenerator with fluidised bed, where it contacts oxygen-containing gas flow and, randomly, with water vapour to realise reaction of coke burning under conditions of regeneration, including range of temperatures from 550°C to 750°C, the average time of catalyst exposure being from 0.5 min to 6 min with ratio of vapour to oxygen-containing gas flow by weight being within the interval from 0 to 0.1. Obtained mixture of partly restored catalyst and smoke gas is introduced into second regenerator with fluidised bed and contacts water vapour and additional flow of oxygen-containing gas to realise further reaction of regeneration under conditions of regeneration including range of temperatures from 550°C to 700°C, the average time of catalyst exposure being in the range from 3 min to 30 min and oxygen-containing gas flow. Ratio of vapour to oxygen-containing gas flow by weight is selected in the range from 0 to 500. After that, regenerated catalyst is introduced into reactor. Second claimed method of catalyst regeneration is characterised by the fact that spent catalyst from reactor is introduced into regenerator with dense fluidised bed, where it contacts flow of oxygen-containing gas and vapour to realise reaction of coke burning under conditions of regeneration, including range of temperatures from 550°C to 750°C, the average time of catalyst exposure being in the interval from 4 min to 30 min and presence of water vapour. Ratio of vapour to oxygen-containing gas flow by weight is selected in the interval from 0 to 0.2, with vapour being introduced into regenerator with dense fluidised layer. After that, regenerated catalyst is introduced into reactor.

EFFECT: regeneration of catalysts by claimed methods makes it possible to improve their selectivity.

23 cl, 2 dwg, 4 tbl, 2 ex