FCC汽油S Zorb反应吸附脱硫过程中不饱和烃加氢反应的研究

S Zorb工艺可以将FCC汽油的硫质量分数降至小于10μg/g,但在脱硫过程中,由于反应体系中引入了H2,在吸附剂表面既发生了硫化物的脱硫反应,也不可避免地存在导致汽油辛烷值损失的不饱和烃的加氢反应。对比分析了中国石化上海高桥分公司S Zorb原料汽油和产品汽油的组成,从热力学和动力学角度分析了这些加氢反应对体系组分变化的影响,计算了标准压力下不同温度下的反应平衡常数K和Gibbs反应自由能ΔrGm,并采用四阶龙格-库塔法计算了每个反应的反应速率常数,这些数据可以为S Zorb装置工艺参数的进一步优化提供参考。

STUDY ON HYDROGENATION OF UNSATURATED HYDROCARBON DURING FCC GASOLINE DESULFURIZATION BY S Zorb PROCESS

The S-Zorb process can reduce the sulfur content of gasoline to less than 10μg/g. However, the hydrogenation reactions of olefins and aromatics occur inevitably during S-Zorb adsorption desulfurization, leading to some octane number loss. In order to optimize the S-Zorb operation, the comparative analysis of the compositions of feed and product of S-Zorb unit of Shanghai Gaoqiao branch was conducted to see the influence of hydrogenation reactions on change of compositions from the point of view of thermodynamics and kinetics. The equilibrium constants and Gibbs free energies at different temperatures were calculated under the normal pressure. And the reaction rate constants were figured out by the 4th order Runge-kutta method.