中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

97 records (took 0.028 seconds)

    47.
    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.

    PRODUCTION OF ANHYDROUS FORMIC ACID
    48.
    发明专利
    PRODUCTION OF ANHYDROUS FORMIC ACID 未知

    公开(公告)号：AU528657B2

    公开(公告)日：1983-05-05

    申请号：AU5729680

    申请日：1980-04-10

    Applicant: BASF AG

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

    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.

Patent Agency Ranking