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    • 2. 发明公开
    • PROCEDE ET DISPOSITIF POUR LA REDUCTION DES COMPOSES AROMATIQUES POLYCYCLIQUES LOURDS DANS LES UNITES D'HYDROCRAQUAGE
    • PROCEDE ET ET DISPOSITIF POUR LA REDUCTION DES COMPOSES AROMATIQUES POLYCYCLIQUES LOURDS DANS LES UNITES D'HYDROCRAQUAGE
    • EP3237578A1
    • 2017-11-01
    • EP15817223.9
    • 2015-12-17
    • AXENS
    • SAUGE, ThibaultGONZALEZ LLAMAZARES, RobertoBONNARDOT, JérômeFRECON, Jacinthe
    • C10G47/00C10G7/00
    • The invention relates to a method and an apparatus for reducing the concentration of heavy polycyclic aromatic compounds (HPNA) in the recycling loop of hydrocracking units, said apparatus including a fractioning column. According to said method, a portion of the flow is drawn off from the fractioning column, which flow is present in the region of at least one tray (I) that is the feed tray or a tray located between the feed tray and said residue discharge point or, if stripping gas is injected, between the feed tray and said stripping gas injection point. A portion, or preferably all, of said flow that has been drawn off is recycled in the hydrocracking step, directly or after optional separation of the gases. The residue is completely purged. In a preferred embodiment, a portion of a flow is furthermore drawn off from the column, which flow is present in the region of at least one tray (II) located between the feed tray and the draw-off tray for the heaviest distillate fraction. After stripping, all or some of the gas is recycled in the column and the liquid is conveyed to the hydrocracking.
    • 本发明涉及用于降低加氢裂化装置循环回路中重质多环芳族化合物(HPNA)浓度的方法和装置,所述装置包括分馏塔。 根据所述方法,从分馏塔抽出一部分流体,该流体存在于作为进料盘的至少一个塔盘(I)或位于进料盘和所述残余物排放口之间的塔盘的区域中 或者如果注入汽提气体,则在进料盘和所述汽提气体注入点之间。 已经排出的所述流的一部分或优选全部在加氢裂化步骤中直接或在任选分离气体之后再循环。 残留物被完全清除。 在一个优选实施方案中,一部分流体进一步从塔中排出,该流体存在于位于进料塔盘和用于最重馏分的排出塔盘之间的至少一个塔盘(II)的区域中。 汽提后,全部或部分气体在塔中循环,液体输送到加氢裂化。