Dual-loop xylene isomerization process
    61.
    发明授权
    Dual-loop xylene isomerization process 有权
    双环二甲苯异构化工艺

    公开(公告)号:US5977420A

    公开(公告)日:1999-11-02

    申请号:US139463

    申请日:1998-08-25

    IPC分类号: C07C15/08 C07C1/00 C07C5/22

    CPC分类号: C07C15/08 C07C2529/00

    摘要: A method for increasing the efficiency of xylene isomerization by using a two stage isomerization process. In the first stage of the process, a C.sub.9.sup.+ aromatics feedstock is subjected to ethylbenzene conversion and xylene isomerization. Non-C.sub.8 aromatics are removed from the effluent, which is then processed in a second stage of the process to remove para-xylene and isomerize the para-xylene depleted effluent. The effluent from the second stage isomerization unit is then recycled into the inlet of the second stage of the process and a slip stream from the para-xylene separator is recycled to the feedstock and to the effluent of the ethylbenzene conversion unit. In this way, the production of para-xylene is maximized. In a preferred embodiment, toluene is co-fed into the feedstock to minimize the loss of xylenes during the ethylbenzene conversion reaction.

    摘要翻译: 一种通过使用两级异构化方法提高二甲苯异构化效率的方法。 在该方法的第一阶段,C9 +芳烃原料进行乙苯转化和二甲苯异构化。 从流出物中除去非-C 8芳族化合物,然后在该方法的第二阶段中处理以除去对二甲苯并使对二甲苯贫乏的流出物异构化。 然后将来自第二级异构化单元的流出物再循环到该方法的第二阶段的入口中,并且来自对二甲苯分离器的滑流再循环至原料和乙苯转化单元的流出物。 以这种方式,对二甲苯的生产最大化。 在优选的实施方案中,将甲苯共同进料到原料中以使乙苯转化反应期间二甲苯的损失最小化。

    Purification of Aromatic Feedstock
    68.
    发明申请
    Purification of Aromatic Feedstock 有权
    芳香原料的净化

    公开(公告)号:US20120048780A1

    公开(公告)日:2012-03-01

    申请号:US13186039

    申请日:2011-07-19

    申请人: Stephen H. Brown

    发明人: Stephen H. Brown

    IPC分类号: C10G25/00 B01J19/00

    摘要: The invention is a process for removing impurities from an aromatics stream and apparatus for the practice thereof, whereby trace olefins and dienes are removed from aromatic plant feedstocks using a reactor design that enables the product to be backmixed with the feedstock and that enables a feed/effluent heat exchanger.

    摘要翻译: 本发明是用于从芳族化合物流中除去杂质的方法及其实践的装置,其中使用能使产物与原料反混的反应器设计从芳族植物原料中除去痕量烯烃和二烯, 流出热交换器。

    Low corrosion in zeolite oligomerisation
    70.
    发明授权
    Low corrosion in zeolite oligomerisation 有权
    沸石低聚中的低腐蚀性

    公开(公告)号:US07880046B2

    公开(公告)日:2011-02-01

    申请号:US11914643

    申请日:2006-06-16

    IPC分类号: C07C2/02

    摘要: Water reacts on molecular sieve catalysts used in oligomerization reactions and forms oxygenated compounds, in particular organic acids that may cause corrosion problems downstream of the reactor, in particular in distillation tower overhead systems and downstream thereof. A lowering of the presence of water in the feed prior to contacting thereof with the molecular sieve brings a significant reduction in corrosion downstream. At the same time, it has a significant beneficial effect on catalyst activity and brings a significant extension of catalyst life. Lowering water in the feed is particularly effective when organic nitrogen-containing Lewis bases are present in the feed, even at low levels.

    摘要翻译: 水在低聚反应中使用的分子筛催化剂上反应,形成氧化化合物,特别是可能在反应器下游引起腐蚀问题的有机酸,特别是在蒸馏塔塔顶系统及其下游。 在与分子筛接触之前,进料中水分的降低导致下游腐蚀的显着降低。 同时对催化剂活性有显着的有益影响,催化剂寿命延长。 当有机含氮路易斯碱存在于进料中时,甚至在低水平下,降低进料中的水是特别有效的。