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    • 8. 发明授权
    • Olefin oligomerization using surface modified molecular sieve catalyst
    • 烯烃低聚使用表面改性分子筛催化剂
    • US06403853B1
    • 2002-06-11
    • US09667167
    • 2000-09-21
    • Hayim AbrevayaRobert R. Frame
    • Hayim AbrevayaRobert R. Frame
    • C07C224
    • C07C2/12B01J29/85B01J37/0246B01J2229/37C07C2521/04C07C2521/06C07C2521/08C07C2521/12C07C2527/167C07C2529/85
    • In a process for the oligomerization of light olefins (e.g. propylene) to more valuable higher olefins (e.g. hexene), the use of a molecular sieve (e.g. SAPO-11) that has been acid washed has shown to provide superior selectivity to, and yield of, the desired product. These benefits are attributed to a reduction in non-selective acid sites as well as an increase in phosphorous content (in the case of SAPO molecular sieves) at the molecular sieve crystallite surface, a probable result of removing amorphous silicon aluminum phosphate acid, silicophosphorous acids, and/or phosphoric acids. Furthermore, this removal is likely accompanied by an increased accessibility of olefinic feed components to the so-called “selective” acid sites within the sieve pores. Post-synthesis acid washing of the molecular sieve has not only demonstrated a narrower carbon number distribution of olefin oligomers, but also improved the linearity of the oligomerized olefinic product slate in general. Such increases in linearity generally correspond to overall higher product values, when downstream applications such as plasticizer intermediates are considered.
    • 在将轻质烯烃(例如丙烯)低聚成更有价值的高级烯烃(例如己烯)的方法中,使用已经被酸洗的分子筛(例如SAPO-11)显示出提供优异的选择性和产率 的,所需的产品。 这些优点归因于在分子筛微晶表面上非选择酸性位​​点的减少以及磷含量的增加(在SAPO分子筛的情况下),去除非晶硅磷酸铝,硅磷酸的可能结果 ,和/或磷酸。 此外,这种去除可能伴随着烯烃进料组分对筛孔内所谓的“选择性”酸性位点的可接近性增加。 分子筛的合成后酸洗不仅表现出烯烃低聚物的较窄的碳数分布,而且通常改善了低聚烯烃产物的线性。 当下游应用如增塑剂中间体被考虑时,线性的这种增加通常对应于总体较高的产品值。