METHOD FOR PREVENTING FUMARIC ACID DEPOSITS IN THE PRODUCTION OF MALEIC ACID ANHYDRIDE
    5.
    发明申请
    METHOD FOR PREVENTING FUMARIC ACID DEPOSITS IN THE PRODUCTION OF MALEIC ACID ANHYDRIDE 审中-公开
    在制备马来酸酐时防止含氟酸沉积物的方法

    公开(公告)号:US20090143601A1

    公开(公告)日:2009-06-04

    申请号:US12300571

    申请日:2007-05-16

    IPC分类号: C07D307/60

    CPC分类号: C07C51/573 C07C57/145

    摘要: The present invention provides a process for preventing fumaric acid deposits in the preparation of maleic anhydride, comprising the following steps:a) absorption of a C4-dicarboxylic acid or of a derivative from a crude product mixture into an organic solvent or water as an absorbent,b) removal of the C4-dicarboxylic acid or of a derivative from the absorbent,the absorbent thus recovered being catalytically hydrogenated fully or partly and recycled fully or partly into the absorption stage (a).

    摘要翻译: 本发明提供了一种在制备马来酸酐中防止富马酸沉积的方法,包括以下步骤:a)将C4-二羧酸或衍生物从粗产物混合物中吸收到作为吸收剂的有机溶剂或水中 b)从吸收剂中除去C4-二羧酸或衍生物,这样回收的吸收剂被完全或部分催化氢化,或者完全或部分地再循环到吸收阶段(a)中。