催化裂化C_4烃催化转化增产丙烯

Catalytic Conversion of Catalytic Cracking C_4 Hydrocarbon to Propylene

在小型固定流化床实验装置上,考察了4种有代表性的催化裂化C4烃在普通催化裂化催化剂上增产丙烯的反应规律,并对普通催化剂以及加入助剂时丙烯收率的变化进行了初步探索.实验结果表明,C4烃在反应温度为400～600℃内的催化转化,主要遵循正碳离子反应机理,C4烃部分催化转化生成丙烯;C4烃中的烷烃几乎不参加反应;低温对异丁烯和正丁烯转化有利,高温对2-丁烯转化有利;异丁烯的最佳反应温度为450℃左右;加入质量分数10%的LCC-A增产丙烯助剂,丙烯收率和芳烃收率分别提高到10%左右.

Reaction behaviors of propylene production by catalytic conversion of C4 hydrocarbon from different Fluidized Catalytic Conversion （FCC）plants in a confined fluidized bed reactor were investigated. Effects of various kinds of catalysts with additive on propylene yield were observed. In temperature range of 400--600 ℃,reactions of butene mainly conformed carbonium ion mechanism, butane basically did not participate reaction and optimal reaction temperature of isobutylene was 450℃ Reaction temperature below 500℃ was advantageous to conversion of isobutene and 1 - butene, and reaction temperature above 500℃ was advantageous to conversion of 2 - butylene. When LCC - A additive was added to catalyst, yields of propylene and aromatics would be up to about 10% ,respectively.