Methanol is converted in light molecular olefins C.sub.2 -C.sub.4 with
93-100% degree of transformation and more than 90% selectivity in which
more than 80% are ethylene and propylene upon a microspherical catalyst
based on SAPO-34 zeolite, with continuous reaction-regeneration in a
fluidized bed reactor-regenerator system. Ethylene/propylene ratio is
changed in relatively large limits 0.69-1.36, by the modification of
reaction temperature and space velocity of the feed.
