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    Process for making propene oxide
    1.
    发明申请
    Process for making propene oxide 有权

    公开(公告)号：US20230120363A1

    公开(公告)日：2023-04-20

    申请号：US18046150

    申请日：2022-10-12

    申请人： Evonik Operations GmbH ,  thyssenkrupp Industrial Solutions AG

    发明人： Maik Bernhard ,  Juliette Halli ,  Marc Brendel ,  Sören Götz ,  Hans-Christian Dietz

    IPC分类号： C07D301/12 ,  C07D303/04 ,  C07D301/32

    摘要： A process for making propene oxide involves reacting propene with hydrogen peroxide in the presence of methanol, a titanium zeolite epoxidation catalyst, and nitrogen containing compounds present in an amount of from 100 to 3000 mg/kg of hydrogen peroxide. Non-reacted propene is separated from the reaction mixture; the propene depleted reaction mixture Is continuously distilled in a distillation column providing an overhead product stream containing propene oxide and methanol and a bottoms product stream; and propene oxide is separated from the overhead product stream. An acid is added to the propane depleted reaction mixture and/or to the distillation column at the same level or above the feed point for the propene depleted reaction mixture and/or contacted to the feed to the distillation column to provide an apparent pH in the bottoms product stream of from 3 to 4.5, which reduces the nitrogen content of the separated propene oxide.

    PROCESS FOR PREPARING AN EPOXIDATION CATALYST
    3.
    发明申请
    PROCESS FOR PREPARING AN EPOXIDATION CATALYST 有权

    公开(公告)号：US20220097028A1

    公开(公告)日：2022-03-31

    申请号：US17034410

    申请日：2020-09-28

    申请人： Dow Technology Investments LLC

    发明人： Mohmed A. Syed ,  Apoorva Kulkarni ,  Vera P. Santos Castro ,  Victor J. Sussman ,  John C. Mckeen ,  Cathy L. Tway ,  Clifford S. Todd

    IPC分类号： B01J23/50 ,  B01J37/02 ,  B01J37/14 ,  C07D301/10 ,  C07D303/04 ,  B01J21/04

    摘要： A process for preparing a silver-containing catalyst for the selective oxidation of ethylene to ethylene oxide including the steps of: (a) providing a multimodal support, (b) preparing an impregnation solution comprising a silver component, (c) impregnating, at least once, the multimodal support of step (a) with the silver-containing impregnation solution of step (b) to form an impregnated support; (d) subjecting the impregnated multimodal support from step (c) to a removal means, such as a centrifuge, at least once, for a time sufficient to remove impregnated silver impregnation solution from the multimodal support and to control the amount of silver in the pores of the multimodal support by selectively removing impregnated silver impregnation solution from a set of larger pores in the multimodal support; (e) roasting, at least once, the multimodal support after the step (d); (f) optionally, repeating the impregnation step (c), (g) optionally, repeating the centrifugation step (d), and (h) optionally, repeating the calcination step (e).