Engineering and operation problems of microspherical alumina chromium catalysts for paraffin dehydrogenation

Mixture of the catalysts with different physical and mechanical properties (abrasion resistance, bulk density, fractional composition) is used for the unit of isobutane dehydrogenation in a fluidized bed OJSC «Nizhnekamskneftekhim» to increase the isoolefin production. There is analysis of the influence of fluidized bed height, circulation multiplicity, pressure drop in the reactor on the efficiency of unit dehydrogenation to find a causes of isobutylene yield decreasing and circulation multiplicity reducing, because it leads to by-products increasing. The main reason for reduction of the olefin yield is pressure drop increase in the reactor due to the restriction of tube free cross-section in wasteheat boilers and scrubbers lattices because of formation of solid, difficult to remove sediments, which consist of a potassium silicate, aluminum oxide, chromium oxide - component of weakest catalyst IM-2201. Rate of accumulation of the sediments is proportional to IM-2201abrasion, which increases after adding to it a high-strength impregnation catalysts. Combined exploitation of catalysts, obtained by spray-drying technology and impregnating of a supports, is not permitted for the pressure stabilization. The improving the aerodynamic characteristics is necessary, in particular, optimization of the fractional composition for self-exploitation more strength alumina-chromium catalyst impregnating type and providing the required height of fluidized bed, it have to be not less than 45 % of total height of the reactor. «Balanced» form of the catalyst, which is operated and circulated in the reactor-regenerator contour, should contain up to 30 wt.% granules smaller than 40 microns, for a required height fluidized bed without plashes, stable on the upper lattices , with less entrainment of dust granules and optimal circulation.

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