H_2S含量对加氢汽油中硫醇的影响

Impact of H_2S on mercaptan in hydrotreated gasoline

考察了Hydro-GAP技术循环氢中H2S含量对加氢汽油中硫醇的影响。结果表明,当循环氢中H2S体积分数低于0.06%时,加氢汽油中的硫醇含量与氢气单程通过时相当;当循环氢中H2S体积分数达到0.25%时,加氢汽油中的硫醇含量显著提高。在循环氢中H2S含量一定时,加氢汽油中的硫醇含量随反应温度的升高而降低。反应温度由260℃提高至380℃,循环氢中H2S体积分数为0.25%时,加氢汽油中的硫醇的质量分数由172μg/g降到42μg/g,降低幅度达到75.6%。由于Hydro-GAP技术采用较高的反应温度,并且催化剂上含有丰富的酸性中心,因而对烯烃与H2S反应生成硫醇具有抑制作用。

The impact of H2S in recycle hydrogen in Hydro-GAP process on mercaptan in hydrotreated gasoline is investigated. The results show that, when H2S in recycle hydrogen is lower than 0.06%, the mer- captan in hydrotreated gasoline is close to that in single pass of hydrogen. When H2S in recycle hydrogen is as high as 0.25%, the mercaptan in hydrotreated gasoline is apparently increased. At a fixed H2S in recycle hy- drogen, the mercaptan in hydrotreated gasoline goes down with rising reaction temperature. When the reaction temperature is raised to 380 ℃ from 260℃ and HiS in recycle hydrogen is 0.25%, the mercaptan in hydro- treated gasoline is reduced to 42 ppm from 172 ppm, which is a 75% reduction. As Hydro-GAP process is op- erated at a higher reaction temperature, and the catalyst have a large amount of active sites, it has an inhabita- tion effect on the reaction of olefins with H2S to produce mercaptan.