Preparation of formic acid

Details Preparation of formic acid Preparation of formic acid

1985-05-09

1993-04-27

Prescott, Arthur C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

203 15, 203 58, C07C 5144, B01D 340

Patent

active

052064336

ABSTRACT:
Anhydrous or substantially anhydrous formic acid is prepared by hydrolyzing methyl formate in the presence of a formamide and then obtaining the formic acid from the hydrolysis mixture by distillation, by a method in which the hydrolysis is carried out in the presence of 0.5-3 moles, per mole of methyl formate, of a water-soluble formamide of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each alkyl or together form an alkylene group, giving a 5-membered to 7-membered ring, with the proviso that the sum of the carbon atoms in R.sup.1 and R.sup.2 is 5 or 6 and, in the case of an alkylene group, a carbon atom which is not directly bonded to the N atom can be replaced by an oxygen atom.

REFERENCES:
patent: 4076594 (1978-02-01), Buelow et al.
patent: 4218568 (1980-08-01), Hohenschutz et al.
patent: 4262140 (1981-04-01), Bott et al.
patent: 4326073 (1982-04-01), Wolf et al.
Migrdichian, V. Organic Synthesis, vol. 1 Reinhold Publishing Corp., N.Y., p. 377 (1957).
Grant, J., Hackh's Chemical Dictionary, 4th ed., McGraw-Hill Book Co., 1969, pp. 34-35.

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