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    OBTAINING ANHYDROUS OR SUBSTANTIALLY ANHYDROUS FORMIC ACID BY HYDROLYSIS OF METHYL FORMATE
    113.
    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.

    SEPARATION OF AN AZEOTROPIC MIXTURE BY DISTILLATION IN A DISTILLATION COLUMN BY A PROCEDURE SIMILAR TO EXTRACTIVE DISTILLATION
    116.
    发明专利
    SEPARATION OF AN AZEOTROPIC MIXTURE BY DISTILLATION IN A DISTILLATION COLUMN BY A PROCEDURE SIMILAR TO EXTRACTIVE DISTILLATION 未知

    公开(公告)号：CA1222717A

    公开(公告)日：1987-06-09

    申请号：CA459954

    申请日：1984-07-30

    Applicant: BASF AG

    Inventor： KAIBEL GERD

    IPC: B01D3/36 ,  B01D3/40

    Abstract: A mixture which is azeotropic or which behaves almost azeotropically and is difficult to separate by distillation, is separated into two pure or substantially pure fractions by distillation, by adding a further component, using a procedure which is similar to extractive distillation and is carried out in a distillation column, a section of which is divided into a feed part and a take off part by means of a separating unit which is effective in the longitudinal direction and completely or partially prevents cross-mixing of liquid streams and/or vapor streams. In this process, the azeotropic mixture is fed as bleed streams to the feed part and to the take off part, in each case at or near the top, and one of the two pure or substantially pure fractions is removed as a top product from the distillation column while the other is removed as a side product from the take off part.

    CONTINUOUS PREPARATION OF FORMAMIDE
    118.
    发明专利
    CONTINUOUS PREPARATION OF FORMAMIDE 未知

    公开(公告)号：CA1213611A

    公开(公告)日：1986-11-04

    申请号：CA396091

    申请日：1982-02-11

    Applicant: BASF AG

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

    IPC: C07C231/02 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C233/03 ,  C07C102/06 ,  C07C103/127

    Abstract: Formamide is prepared continuously from methyl formate and ammonia, pure methanol being recovered, by a process wherein a) the reaction of methyl formate and ammonia is carried out predominantly in the liquid phase in the upper region of a reaction column R having a total of from 15 to 30 theoretical plates, b) the methanol formed in this reaction is removed, together with small amounts of formamide, from the column or the evaporator in vaporous form at the level of plates 1 - 5 (counted from the bottom), c) the formamide is removed from this methanol/ formamide mixture, together with small amounts of methanol, in a distillation column Dl and recycled to R, and d) the small amounts of methanol contained in the bottom product from R, which substantially consists of formamide and in this column should be at from 110 to 130.degree.C, are separated off in a distillation column D2.

    RECOVERY OF FORMIC ACID BY DISTILLATION
    120.
    发明专利
    RECOVERY OF FORMIC ACID BY DISTILLATION 未知

    公开(公告)号：CA1211736A

    公开(公告)日：1986-09-23

    申请号：CA455386

    申请日：1984-05-29

    Applicant: BASF AG

    Inventor： BOTT KASPAR ,  KAIBEL GERD ,  HARTMANN HORST ,  IRNICH RUDOLF ,  BUELOW HORST

    IPC: C07C53/02 ,  C07C51/00 ,  C07C51/44 ,  C07C67/00

    Abstract: Formic acid is recovered, by distillation, from its mixtures with solvents of the general formula I where R1 is hydrogen, methyl, ethyl or vinyl and R2 and R3 are each alkyl, cycloalkyl, aryl or aralkyl, or R2 and R3 together form a 1,4- or 1,5-alkylene group of 1 to 8 carbon atoms, with the provisos that the sum of the number of carbon atoms in R2 and R3 is 7 to 14 and that only one of these radicals is aryl, by a method in which the distillation is carried out in the presence of a carboxamide II which has a boiling point lower than that of the solvent I.

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