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    25.
    发明专利
    未知

    公开(公告)号：NO794080L

    公开(公告)日：1980-06-17

    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 ,  C07C53/02 ,  C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C67/00 ,  C07C

    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.

    OBTAINING ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID BY HYDROLYSIS OF METHYL FORMATE
    28.
    发明专利
    OBTAINING ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID BY HYDROLYSIS OF METHYL FORMATE 未知

    公开(公告)号：CA1238919A

    公开(公告)日：1988-07-05

    申请号：CA476766

    申请日：1985-03-18

    Applicant: BASF AG

    Inventor： BOTT KASPAR ,  KAIBEL GERD ,  MITTELSTAEDT ERICH ,  IRNICH RUDOLF

    IPC: C07C51/00 ,  B01J31/02 ,  C07B61/00 ,  C07C27/02 ,  C07C51/09 ,  C07C51/44 ,  C07C51/48 ,  C07C51/56 ,  C07C53/02 ,  C07C67/00 ,  C07C51/377

    Abstract: Anhydrous of substantially anhydrous formic acid is obtained by hydrolysis of methyl formate by a process in which, methyl formate is hydrolyzed in the presence of a carboxamide of the general formula (I): (I) where R1 is alkyl or hydrogen, R2 is alkyl, R3 is hydrogen or a C1 to C4 alkyl, and R1 and R2 may form part of a 5membered or 6-membered ring, and the sum of the carbon atoms in the radicals R1, R2 and R3 is from 1 to 14. The mixture formed during the hydrolysis is separated into its individual components in a first distillation column which is divided into a feed part and a take-off part by separating means which are effective in the longitudinal direction. During the process the hydrolysis mixture is fed into the feed part, while methanol and unreacted methyl formate are taken off as a top product and as a side product. Formic acid and the carboxamide of formula I (as extracting agent) are taken off as an anhydrous or substantially anhydrous bottom product. Water, preferably in liquid form, is removed from the take-off part. Finally the bottom product from the first distillation column is separated, in a second distillation column, into formic acid and the extracting agent. This process avoids decomposition of the products and does not require liquid-liquid extraction to remove water.

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