PROCESS FOR OBTAINING LIGHT OLEFINS BY THE DEHYDROGENATION OF THE CORRESPONDING PARAFFINS

摘要

A process for obtaining light olefins by the dehydrogenation of the corresponding paraffins, consisting: a) in reacting in a reactor, operating at a temperature of between 450 and 800.degree.C, at a pressure of between 0.1 and 3 Atm absolute and with a GHSV space velocity of between 100 and 10000 h-1, said paraffins with a catalytic system containing chromium oxide, tin oxide, at least one alkaline metal oxide (M) and an alumina carrier, in delta or theta phase or in mixed delta + theta or theta + alpha or delta + theta + alpha phases, modified with silica, in which: - the chromium, expressed as Cr2O3, is in a quantity of between 6 and 30 % by weight; - the tin, expressed as SnO, is in a quantity of between 0.1 and 3.5 % by weight; - the alkaline metal, expressed as M2O, is in a quantity of between 0.4 and 3 % by weight; - the silica is in a quantity of between 0.08 and 3 % by weight, the complement to 100 being alumina, b) in regenerating said catalytic system in a regenerator by burning the coke deposited on its surface operating at a temperature of more than 400.degree.C.