原料族组成对汽油馏分催化裂解反应性能的影响

Effect of gasoline hydrocarbon composition on the performance of catalytic pyrolysis

利用多产低碳烯烃催化剂NHC-516,在小型固定流化床实验装置上对催化裂化汽油、焦化汽油和直馏汽油的催化裂解性能进行了实验研究,考察了不同原料族组成对催化裂解产物分布、低碳烯烃收率以及催化裂解液相产物族组成的影响。结果表明:乙烯的收率随着反应温度的升高呈抛物线增长;催化汽油和焦化汽油的丙烯收率远高于直馏汽油的丙烯收率;烯烃与链烷烃有协同作用,烯烃能够加速链烷烃的反应速率,这是焦化汽油干气收率高的主要原因;在有烯烃存在时,芳烃会生成大量的焦炭;烯烃和链烷烃是生成低碳烯烃的主要来源,是催化裂解的理想组分。

The catalytic pyrolysis of FCC gasoline, coker gasoline and distilled gasoline for maximizing light olefins were investigated in a fixed fluidized bed reactor over a catalyst NHC -516. The influence of the composition of feedstocks on the pyrolysis product distribution, the yields of light olefins and the liquid products were studied. The results showed that the ethylene content increased in a parabola shape with the reaction temperature. The yields of propylene of FCC gasoline and coker gasoline were significantly higher than that of distilled gasoline. The olefins could accelerate the reaction of paraffins because of a synergistic effect between them, which was responsible for high content of dry gas in the pyrolysis products of coker gasoline. In the existence of olefins, aromatics could form a great deal of coke. It could drawn that olefins and paraffins were the main resource to produce light olefins, and so they were the ideal gasoline components for catalytic pyrolysis.