采用Co-Mo型催化剂在中型固定床加氢试验装置上考察催化裂化汽油选择性加氢脱硫过程中不同脱硫深度下循环氢中硫化氢含量对加氢脱硫反应和烯烃加氢饱和反应的影响.结果表明:硫化氢对加氢脱硫反应具有抑制作用,对烯烃加氢饱和反应具有促进作用,随着循环氢中硫化氢含量的增大,催化剂的选择性下降.不同反应苛刻度下,硫化氢对脱硫反应和烯烃加氢饱和反应的影响程度不同,在较低苛刻度条件下,控制产品硫质量分数不大于50 μg/g时,硫化氢对脱硫反应和烯烃加氢饱和反应的影响相对较大；在较高苛刻度条件下,控制产品硫质量分数不大于10 μg/g时,硫化氢对脱硫反应和烯烃加氢饱和反应的影响相对较小.%On a fix-bed hydrogenation pilot plant unit,the effect of H2S in recycle hydrogen on the hydrodesulfurization (HDS) and olefin saturation(HYD) reactions during FCC heavy naphtha selective hydrogenation process over Co-Mo catalyst was studied. The results showed that the existence of H2S could inhibit HDS reactions and promote HYD reactions, however, the selectivity of the catalyst decreased with the increase of H2S content in recycle hydrogen. Results also showed that the effect of H2S content in recycle hydrogen on HDS and HYD reactions was varied under various reaction severities: under relatively mild operation conditions to keep the total sulfur content of liquid product below 50 μg/g,the influence of H2S was significant; under relatively severe operation conditions to keep the total sulfur content of liquid product below 10 μg/g,the influence of H2S was less significant.
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