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    5.
    发明专利
    未知

    公开(公告)号：NO149470B

    公开(公告)日：1984-01-16

    申请号：NO794080

    申请日：1979-12-13

    Applicant: BASF AG

    Inventor： BOTT KASPAR ,  KAIBEL GERD ,  HOFFMANN HERWIG ,  KRATZER OTTO ,  IRNICH RUDOLF

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

    Abstract: A process for the production of anhydrous or substantially anhydrous formic acid by hydrolysis of methyl formate which is carried out in a column having an upper fractionating section, a middle hydrolysis section and a lower extraction section and in which (a) the hydrolysis is carried out in the middle section of the columm, with water and methyl formate in countercurrent, (b) the resulting formic acid is extracted, in the lower section of the column, by means of a carboxylic acid amide which is fed into the lower end of the middle section of the column, (c) the extract phase, consisting in the main of formic acid and the carboxylic acid amide, is distillatively dehydrated, or substantially dehydrated, in the lower section of the column, (d) the methanol and uncovered methyl formate are removed by fractional distillation in the upper section of the column and (e) the pure formic acid or concentrated aqueous formic acid is distilled from the anhydrous or substantially anhydrous extract phase in a second column, leaving the carboxylic acid amide.

    PROCESS FOR PRODUCING CARBOXYLIC ACID CHLORIDES
    8.
    发明专利
    PROCESS FOR PRODUCING CARBOXYLIC ACID CHLORIDES 未知

    公开(公告)号：HU202181B

    公开(公告)日：1991-02-28

    申请号：HU206589

    申请日：1989-05-02

    Applicant: BASF AG

    Inventor： DECKER MARTIN ,  FRANZISCHKA WOLFGANG ,  IRNICH RUDOLF ,  SAUERWALD MANFRED

    IPC: B01J31/04 ,  C07B61/00 ,  C07C51/00 ,  C07C51/60 ,  C07C53/38 ,  C07C53/42 ,  C07C67/00

    Abstract: Acid chlorides are prepared by reaction of carboxylic acids or anhydrides thereof with phosgene in the presence of a carboxamide of the formula I in which R denotes a radical of the formulae R denotes an alkyl radical having 2 to 9 carbon atoms, R denotes an alkyl radical having 1 to 9 carbon atoms, R and R denote hydrogen atoms or alkyl radicals having 1 to 9 carbon atoms, the two radicals R and R can also represent a hydrocarbon radical which completes the molecule portion to give a heterocycle, it being possible for the alkyl and hydrocarbon radicals mentioned additionally to contain substituents which are inert under the reaction conditions.

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