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    Method for producing alkali methylates
    233.
    发明专利
    Method for producing alkali methylates 未知

    公开(公告)号：AU3008501A

    公开(公告)日：2001-06-18

    申请号：AU3008501

    申请日：2000-12-08

    Applicant: BASF AG

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

    IPC: B01D1/28 ,  C07C29/70 ,  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

    236.
    发明专利
    未知

    公开(公告)号：DE19907532A1

    公开(公告)日：2000-08-31

    申请号：DE19907532

    申请日：1999-02-22

    Applicant: BASF AG

    Inventor： BRUNNER MELANIE ,  HENKELMANN JOCHEM ,  KAIBEL GERD ,  KINDLER ALOIS ,  KNOLL CHRISTIAN ,  RUST HARALD ,  TRAGUT CHRISTIAN

    IPC: C07C29/17 ,  C07C29/42 ,  C07C29/74 ,  C07C31/18 ,  C07C33/044

    Abstract: The invention relates to a method for preparing at least one unsaturated alcohol (B). The method comprises the following steps (I) to (III): (I) reaction of at least one alkali or alkaline earth hydroxide with at least one alcohol (A) in at least one organic solvent (L) so that a mixture (G-I) is obtained which contains at least the alcohol (A), the solvent (L) and an alcoholate (AL); (II) reaction of at least one carbonyl compound of the general structure R-CO-R' with at least one alkine of the general structure R"-CC-H and the mixture (G-I) obtained in step (I) above, so that a mixture (G-II) is obtained which contains at least the alcohol (A), the solvent (L) and an unsaturated alcohol (B); and (III) distillation of the mixture (G-II) obtained in step (II) above so that the at least one alcohol (B) and a mixture (G-III) containing the solvent (L) and the alcohol (A), are obtained. Said method is characterized in that the solvent (L) and the alcohol (A) obtained in step (III) are fed back to step (I) as a mixture.

    237.
    发明专利
    未知

    公开(公告)号：DE19852691A1

    公开(公告)日：2000-05-18

    申请号：DE19852691

    申请日：1998-11-16

    Applicant: BASF AG

    Inventor： OOST CARSTEN ,  STROEZEL MANFRED ,  ETZRODT HEINZ ,  WELLER DIETMAR ,  RHEUDE UDO ,  KAIBEL GERD ,  KRUG THOMAS ,  SPISKE LUISE ,  JAEDICKE HAGEN

    IPC: B01J31/14 ,  C07B61/00 ,  C07C45/67 ,  C07C45/74 ,  C07C49/203

    Abstract: Preparation of unsaturated ketones by reaction of the corresponding alpha , beta -unsaturated alcohol with an alkyl acetoacetate compound in the presence an organo-aluminum catalyst at constant temperature, with separation and continuous removal of CO2 and alcohol formed. Preparation of unsaturated ketones of formula (I) by reaction of the corresponding alpha , beta -unsaturated alcohol of formula (II) with an alkyl acetoacetate compound of formula (III) in the presence of 0.1-5 mole% (based on (III)) of an organo-aluminum catalyst with separation and continuous distillative removal of CO2 and alcohol of formula R3OH formed during reaction, in a reactor containing a fractionation column, where: (A) (II) is added to the reaction mixture together with the organic catalyst without additional solvent and (III) is then added to this mixture; (B) the reaction temperature is kept constant between 175-220 degrees C; (C) the content of (III) is kept at a constant level between 0.1-10 wt.% during the reaction. R1, R3 = 1-4C alkyl; R2 = 4-30C aliphatic, cycloaliphatic or cycloaliphatic-aliphatic; a, b = optional additional bonds.

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