Production of anhydrous or substantially anhydrous formic acid

Details Production of anhydrous or substantially anhydrous formic acid Production of anhydrous or substantially anhydrous formic acid

C - Chemistry, Metallurgy

07

C

202/69, 260/529.

C07C 53/02 (2006.01) C07C 51/09 (2006.01) C07C 51/44 (2006.01) C07C 51/48 (2006.01)

Patent

CA 1135281

ABSTRACT OF THE DISCLOSURE: A process for the production of anhydrous or substantially anhydrous formic acid by hydrolysis of methyl formate which is carried out in a column and in which a) the hydrolysis 15 carried out in the middle section of the column, with water and methyl formate in counter- current, b) the resulting formic acid is extracted, in the lower section of the column, by means of a carboxylic acid amide of the general formula I Image I where Rl and R2 are alkyl, which may also be linked to form a 5-membered or 6-membered ring, or are cyclohexyl, and R3 is hydrogen or Cl-C4-alkyl, the sum of the carbon atoms in radicals R1, R2 and R3 being from 7 to 14, the carboxylic acid amide being 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 uncoverted 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.

341669

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