Process for obtaining light olefins by dehydrogenation of corresponding paraffins

一种通过相应链烷烃脱氢得到轻质烯烃的方法，包括：a)在温度为450－800℃，压力为0.1－3绝对大气压，GHSV空速为100－10000小时#+[-1]的操作条件下，在反应器中所述的链烷烃与催化体系反应，该催化体系含有氧化铬，氧化锡，至少一种碱金属氧化物(M)和氧化铝载体，该氧化铝载体为δ或θ相或混合的δ+θ或θ+α或δ+θ+α相，并用氧化硅改性，其中：-铬，表示为Cr#-[2]O#-[3]，其含量为6－30％(重量)；-锡，表示为SnO，其含量为0.1－3.5％(重量)；-碱金属，表示为M#-[2]O，其含量为0.4－3％(重量)；-氧化硅的含量为0.08－3％(重量)，用氧化铝补足到100，b)在再生器中通过燃烧催化体系表面上的积炭再生所述的催化体系，操作温度高于400℃。 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 DEG C, at a pressure of between 0.1 and 3 Atm absolute and with a GHSV space velocity of between 100 and 10000 h, 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 DEG C.