A RECYCLING METHOD FOR A FLUIDIZED BED MICROSPHERE CATALYST

摘要

A recycling method for a fluidized bed microsphere catalyst, wherein mixing the catalysts to be recycled with the raw materials for preparation of fresh microsphere catalysts in certain proportion, glue milling the slurry, then spray drying and calcining under high temperature, then a microsphere catalyst having low abrasion index and suitable particle size distribution can be obtained. The method comprises the following steps: 1) mixing the catalysts to be recycled with virgin molecular sieve, binder, promoter, pore forming agent, and deionized water, based on the weight of dry oxides, pulping, the weight percent of the catalysts to be recycled not more than 80% of the total dry oxides of the mixtures; 2) glue milling the slurry by a glue mill to get the particle diameter of solid particles lower than 20µm, the particle diameter of 90% solid particles lower than 10µm, the particle diameter of 70% solid particles lower than 5µm; 3) spray drying to prepare a microsphere sample; 4) calcining the microsphere sample under 500-800° C in an oxygen containing atmosphere to obtain a fluidized bed microsphere catalyst. The prepared catalyst is suited for use in the conversion of oxygenates to olefins.