Title:
METHOD OF OBTAINING ANHYDROUS OR ALMOST ANHYDROUS FORMIC ACID
Document Type and Number:
Japanese Patent JPS5583730
Kind Code:
A
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.
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Inventors:
KASUPAA BOTSUTO
GERUTO KAIBERU
HERUBUIHI HOFUMAN
OTSUTOO KURATSUTSUAA
GERUTO KAIBERU
HERUBUIHI HOFUMAN
OTSUTOO KURATSUTSUAA
Application Number:
JP16091479A
Publication Date:
June 24, 1980
Filing Date:
December 13, 1979
Export Citation:
Assignee:
BASF AG (DE)
International Classes:
C07C51/00; C07C51/09; C07C51/44; C07C53/02; C07C51/48; C07C67/00; (IPC1-7): C07C51/09; C07C51/48; C07C53/02