VERFAHREN ZUR HERSTELLUNG VON 1,4-BUTANDIOL
    6.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON 1,4-BUTANDIOL 有权
    用于生产1,4-丁二醇

    公开(公告)号:EP1073620A1

    公开(公告)日:2001-02-07

    申请号:EP99920693.1

    申请日:1999-04-16

    摘要: The invention relates to a method for producing 1,4-butanediol and possibly η-butyrolactone and tetrahydrofurane by oxidation of butane or benzol into a product flow containing maleic anhydride, absorption of maleic anhydride from the product flow by means of an inert, high-boiling solvent in an absorption stage, which yields a liquid absorption product, and esterification of said liquid absorption product with a C1-C5 esterification alcohol in an esterification step, yielding an esterification product containing the corresponding diester and high-boiling inert solvent. This is followed by hydrogenation of the esterification product, which results in an hydrogenation product containing the products 1,4-butanediol and optionally η-butyrolactone and tetrahydrofurane as well as the esterification alcohol. The hydrogenation product is separated by distillation into the products and the esterification alcohol and the esterification alcohol is returned to the esterification zone. Prior to hydrogenation the esterification product is separated by distillation under reduced pressured into the diester and the inert solvent, the inert solvent is returned to the absorption stage and the diester is hydrogenated in the liquid phase on a fixed-bed catalyst.

    VERFAHREN ZUR HERSTELLUNG VON ALKALIMETHYLATEN
    9.
    发明公开
    VERFAHREN ZUR HERSTELLUNG VON ALKALIMETHYLATEN 有权
    用于生产碱金属甲醇盐

    公开(公告)号:EP1242345A1

    公开(公告)日:2002-09-25

    申请号:EP00990689.2

    申请日:2000-12-08

    IPC分类号: C07C29/70 C07C29/80

    摘要: The invention relates to a method for producing alkali methylates from an aqueous alkaline lye that is optionally mixed with methanol and methanol in a reaction column, said column comprising at least 5, preferably 15 to 30 theoretical trays between the inlet of the alkaline lye and the site of addition of the methanol. According to the inventive method, the vapor methanol-water mixture formed during the reaction is separated in a reaction column. According to an embodiment of the invention, the reaction column that is configured as a bubble-tray, valve-tray or sieve-plate column is provided with trays, each letting through maximally 5 %, preferably ≤ 1 % of the liquid. In another embodiment of the invention, the reaction column that is provided with a double jacket is configured as a column that is filled with fillers or oriented packings at a temperature in the double jacket that is 3 to 10 °C higher than the temperature in the inner of the column. In all sections of the column diameter that correspond to more than 2 % of the total column diameter, the average ratio of the liquid flow to the vapor flow with respect to the liquid is not exceeded by more than 15 %, preferably by not more than 3 %.