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    • 5. 发明申请
    • CONVERSION OF OXYGENATE TO PROPYLENE WITH SELECTIVE HYDROGEN TREATMENT OF HEAVY OLEFIN RECYCLE STREAM
    • 通过选择性氢处理重型油脂循环流程将氧化剂转化为丙烯
    • WO2006033759A3
    • 2006-09-14
    • PCT/US2005030075
    • 2005-08-25
    • UOP LLCKALNES TOM NWEI DANIEL HGLOVER BRYAN K
    • KALNES TOM NWEI DANIEL HGLOVER BRYAN K
    • C07C1/00
    • C07C11/06C07C1/20C07C2529/40C07C2529/80C07C2529/85Y02P20/52Y02P20/582Y02P20/584
    • The average cycle propylene selectivity of an oxygenate to propylene (OTP) process using one or more fixed or moving beds of a dual-function oxygenate conversion catalyst with recycle of one or more C4+ olefin-rich fractions is substantially enhanced by the use of selective hydrotreating technology on these C4+ olefin-rich recycle streams to substantially eliminate detrimental coke precursors such as dienes and acetylenic hydrocarbons. This hydrotreating step helps hold the build-up of detrimental coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling a substantial improvement in propylene average cycle yield. The propylene average cycle yield improvement enabled by the present invention over the prior art system but without the use of the hydrotreating step on the C4+ olefin-rich recycle stream is of the order of 1.5 to 5.5 wt-% or more.
    • 使用一种或多种具有一种或多种富含C4 +烯烃的级分的再循环的双功能含氧化合物转化催化剂的固定床或移动床的含氧化合物对丙烯(OTP)方法的平均循环丙烯选择性通过使用选择性加氢处理 这些富含C4 +烯烃的循环物流的技术基本上消除了有害的焦炭前体,如二烯和炔烃。 该加氢处理步骤有助于将催化剂上的有害焦炭沉积物的积聚保持在基本上不降低双功能催化剂活性,含氧化合物转化率和丙烯选择性的水平,从而可以显着提高丙烯平均循环产率。 本发明相对于现有技术的系统而言,丙烯平均循环产率的改进,但不使用在富含C4 +烯烃的再循环料流上的加氢处理步骤为1.5〜5.5重量%以上。