降低催化裂化汽油硫和烯烃含量的技术途径

TECHNOLOGIES FOR REDUCTION OF SULFUR AND OLEFIN IN FCC NAPHTHA

介绍几种降低催化裂化汽油硫及烯烃含量的技术途径,比较这些技术的使用范围及其优缺点。重点介绍国内已工业化的降低催化裂化汽油硫和烯烃含量的技术,包括加氢异构脱硫降烯烃(RIDOS)技术,多产异构烷烃的催化裂化新工艺(MIP)技术等。指出,前加氢法(催化裂化原料加氢预处理)具有诸多优点,但装置投资高,难以满足清洁汽油φ(烯烃)<20％的要求。催化裂化汽油后加氢法中,对于高硫、低烯烃原料,宜采用选择性加氢脱硫技术;对高硫、高烯烃原料,宜采用加氢异构脱硫降烯烃技术。催化裂化降烯烃新工艺、催化剂和助剂具有投资少,见效快等优点,但难以满足汽油φ(烯烃)<20％,ω(硫)<800μg/g的标准。催化裂化降烯烃技术与加氢技术的组合可能是我国生产新标准清洁汽油的适宜途径。

Technologies for olefin and sulfur reduction in FCC naphtha are introduced and com-pared. More attention is focused on the technologies, which have been commercialized to reduce the sulfur and olefin in FCC naphtha, such as the maximum isoparaffin process, MIP, and the isomerization and desulfurization process of FCC naphtha via hydrogenation, RIDOS. It is pointed out that the pre-hydrotreating of FCC feedstock has many advantages but a higher equipment investment, and the olefin content in the FCC naphtha product can not reach the clean gasoline requirement of less than 20v%. As to the post hydrotreating of FCC naphtha, it is suitable to use selective hydrodesufurization for the naphtha feedstock with high sulfur and low olefin ; and RIDOS process is more suitable for the naphtha feedstock with high sulfur and high olefin. The new FCC process, MIP, and new FCC catalysts and ad-ditives for reducing the olefin content in FCC naphtha have the advantages of low investment, however, which stili have difficulties to satisfy the clean gasoline requirement of olefin content less than 20 v % and sulfur less than 800μg/g. The combination of FCC and hydrotreating technologies is a promising route for production of clean gasoline meeting the new gasoline standard.