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    PROCESS FOR THE OBTENTION OF ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID
    61.
    发明专利
    PROCESS FOR THE OBTENTION OF ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID 未知

    公开(公告)号：DE3060960D1

    公开(公告)日：1982-11-25

    申请号：DE3060960

    申请日：1980-04-03

    Applicant: BASF AG

    Inventor： WOLF DIETER DR ,  SCHMIDT RUDOLF DR ,  BLOCK ULRICH DR ,  SCHOENMAKERS HARTMUT DR ,  BOTT KASPAR DR ,  KAIBEL GERD

    IPC: C07C53/02 ,  C07C27/02 ,  C07C51/00 ,  C07C51/09 ,  C07C51/42 ,  C07C51/44 ,  C07C51/48 ,  C07C67/00

    Abstract: Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein (a) methyl formate is hydrolyzed, (b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained, (c) the bottom product of distillation (b), consisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid, (d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation, (e) the top product obtained from this distillation and consisting of all or part of the water introduced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distillation column of stage (b), (f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separated by distillation into anhydrous or substantially anhydrous formic acid and the extractant, and (g) the extractant leaving stage (f) is recycled to the process.

    METHOD FOR PRODUCING ALKALI METHOXYDES
    64.
    发明专利
    METHOD FOR PRODUCING ALKALI METHOXYDES 未知

    公开(公告)号：HU229495B1

    公开(公告)日：2014-01-28

    申请号：HU0301074

    申请日：2000-12-08

    Applicant: BASF AG

    Inventor： GUTH JOSEF ,  FRIEDRICH HOLGER ,  STERZEL HANS-JOSEF DR ,  KAIBEL GERD ,  BURKART KIRSTEN ,  HOFFMANN ELKE

    IPC: C07C29/70 ,  B01D1/28 ,  C07C29/80 ,  C07C31/30

    Abstract: Alkali metal methoxides are prepared from aqueous alkali metal hydroxide, which may have been admixed with methanol, and methanol in a reaction column having at least 5, preferably from 15 to 30, theoretical plates between the feed point for the aqueous alkali metal hydroxide and the feed point for the methanol. The gaseous methanol/water mixture formed in the reaction is fractionated in a rectification column. In one variant of the invention, the trays chosen for the reaction column configured as a bubble cap tray, valve tray or sieve tray column are trays in which not more than 5%, preferably

    67.
    发明专利
    未知

    公开(公告)号：DK1339658T3

    公开(公告)日：2007-12-27

    申请号：DK01996522

    申请日：2001-11-15

    Applicant: BASF AG

    Inventor： BOHNER GERD ,  KINDLER KLAUS ,  PAHL MELANIE ,  KAIBEL GERD

    IPC: C07C11/167 ,  B01D3/14 ,  C07C7/04

    Abstract: A process for obtaining pure 1,3-butadiene from crude 1,3-butadiene by distillation is carried out in a dividing wall column in which a dividing wall is located in the longitudinal direction of the column to form an upper common column region, a lower common column region, a feed section and an offtake section.

    69.
    发明专利
    未知

    公开(公告)号：DE102006024903A1

    公开(公告)日：2007-11-29

    申请号：DE102006024903

    申请日：2006-05-24

    Applicant: BASF AG

    Inventor： PINKOS ROLF ,  KAIBEL GERD ,  DAHLHOFF ELLEN ,  WINDECKER GUNTHER ,  HEIMANN JENS

    IPC: C07D307/60 ,  C07C55/10

    Abstract: 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).

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