METHOD FOR ACID TREATMENT CONDITIONING OF A CATALYST IN THE PRODUCTION OF GLYCOLS

    公开(公告)号:US20190256446A1

    公开(公告)日:2019-08-22

    申请号:US16336140

    申请日:2017-09-28

    Abstract: Implementations of the disclosed subject matter provide methods for producing ethylene glycol from a carbohydrate feed which may include conditioning a heterogeneous hydrogenation catalyst by treatment with a protic acid resulting in an acid-conditioned heterogeneous hydrogenation catalyst. Next, in a reactor under hydrogenation conditions, the carbohydrate feed may be contacted with a bi-functional catalyst system comprising the acid-conditioned heterogeneous hydrogenation catalyst, and a soluble retro-Aldol catalyst. An intermediate product stream may be obtained from the reactor including ethylene glycol.

    PROCESS FOR THE PRODUCTION OF GLYCOLS
    3.
    发明申请

    公开(公告)号:US20180297920A1

    公开(公告)日:2018-10-18

    申请号:US15768034

    申请日:2016-10-18

    Abstract: A process for the production of glycols is provided, the process comprising contacting a saccharide-containing feedstock with hydrogen in the presence of a catalyst composition and a solvent, wherein the solvent comprises water and at least 25% by weight, based on the total weight of the solvent, of one or more alcohols selected from a C1 to C6 alcohol, a C1 to C6 polyalcohol, and a combination thereof.

    PROCESS FOR THE PREPARATION OF GLYCOLS
    5.
    发明申请

    公开(公告)号:US20180282249A1

    公开(公告)日:2018-10-04

    申请号:US15763714

    申请日:2016-09-27

    CPC classification number: C07C29/60 C07C29/132 C07C31/202 C07C31/205

    Abstract: A process for the preparation of glycols from a saccharide-containing feedstock comprising the steps of: (a) preparing a reaction mixture in a reactor vessel comprising the saccharide-containing feedstock, a solvent, a catalyst component with retro-aldol catalytic capabilities and a first hydrogenation catalyst comprising an element selected from groups 8, 9 and 10 of the periodic table; (b) supplying hydrogen gas to the reaction mixture in the reactor vessel; (c) monitoring the activity of the first hydrogenation catalyst; (d) preparing a second hydrogenation catalyst by contacting in a reactor a catalyst precursor comprising one or more elements selected from chromium and groups 8, 9, 10 and 11 of the periodic table with hydrazine to convert the catalyst precursor into the second hydrogenation catalyst; (e) when the hydrogenation activity declines, supplying the second hydrogenation catalyst to the reactor vessel to supplement the declined hydrogenation activity in the reactor vessel.

    METHOD FOR THE PRODUCTION OF GLYCOLS FROM A CARBOHYDRATE FEED

    公开(公告)号:US20190062243A1

    公开(公告)日:2019-02-28

    申请号:US15768964

    申请日:2016-10-16

    Abstract: Implementations of the disclosed subject matter provide methods for producing ethylene glycol from a carbohydrate feed may include contacting, in a first reactor under hydrogenation conditions, the carbohydrate feed with a bi-functional catalyst system. The bi-functional catalyst system may include a heterogeneous hydrogenation catalyst, and a soluble retro-Aldol catalyst. The carbohydrate feed may include a concentration of carbohydrate, in the total solution entering the first reactor, of 5-40 wt % in a solvent. An intermediate product stream may be obtained from the first reactor including ethylene glycol. The hydrogenation conditions may include a temperature in the range of from 180-250° C.

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