NOVEL LACTIC ACID RECOVERY PROCESS
    41.
    发明申请

    公开(公告)号:US20170204045A1

    公开(公告)日:2017-07-20

    申请号:US15324898

    申请日:2015-07-10

    Inventor: Jose Leboreiro

    CPC classification number: C07C67/54 C07C67/03 C07C67/08 C12P7/56 C07C69/68

    Abstract: A novel two step distillation process for recovering lactic acid and ethyl lactate from still bottoms is described. In comparison to conventional distillation processes, this process involves a reaction and a second distillation which converts the lactic acid monomer and other lactic acid species that remain in the still bottoms after a first, conventional distillation step into ethyl lactate by simultaneously esterifying and transesterifying all lactic acid species present in the still bottoms.

    Process for acid dehydration of sugar alcohols

    公开(公告)号:US09630974B2

    公开(公告)日:2017-04-25

    申请号:US14771825

    申请日:2014-02-21

    CPC classification number: C07D493/04

    Abstract: A process is described for the acid-catalyzed dehydration of a sugar alcohol, wherein the catalyst comprises a water-tolerant Lewis acid. In particular embodiments, the catalyst comprises a homogeneous water-tolerant Lewis acid, especially a homogeneous Lewis acid selected from the group consisting of bismuth (III) triflate, gallium (III) triflate, scandium (III) triflate, aluminum triflate, tin (II) triflate and indium (III) triflate. Such catalysts are effective for dehydrating both of sorbitol and the 1,4-sorbitan dehydration precursor of isosorbide, and bismuth (III) triflate particularly is beneficial for dehydrating mannitol to isomannide.

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