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    A METHOD FOR THE PREPARATION OF 1,2-PROPANEDIOL
    23.
    发明公开
    A METHOD FOR THE PREPARATION OF 1,2-PROPANEDIOL 审中-公开

    公开(公告)号：EP3988530A1

    公开(公告)日：2022-04-27

    申请号：EP20203029.2

    申请日：2020-10-21

    Applicant: Evonik Operations GmbH

    Inventor： WIEDERHOLD, Holger ,  BOLZ, David ,  GLATZ, Patrick

    IPC: C07C29/48 ,  C07C31/20 ,  B01J3/00

    Abstract: 1,2-propanediol is prepared by a method comprising step a) of reacting propene with hydrogen peroxide at 50 to 110 °C in the presence of a catalyst mixture comprising a phase transfer catalyst and a polytungstophosphate in a liquid reaction mixture comprising an aqueous phase with a maximum apparent pH of 6 and an organic phase; step b) of separating the reaction mixture into an aqueous phase (P a ) comprising 1,2-propanediol and an organic phase (P o ); step c) of recycling at least part of the separated organic phase (P o ) to step a); step d) of recovering 1,2-propanediol from the aqueous phase (P a ); and step e) of reacting a tungstate with hydrogen peroxide and phosphoric acid at 5 to 40 °C in the presence of the phase transfer catalyst in a liquid mixture comprising an aqueous and an organic phase, followed by passing at least a part of the resulting organic phase comprising the polytungstophosphate and phase transfer catalyst to reaction step a).

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