Recovery of formic acid by distillation

Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound

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562609, 203 57, B01D 334

Patent

active

045512086

ABSTRACT:
Formic acid is recovered, by distillation, from its mixtures with solvents of the general formula I ##STR1## where R.sup.1 is hydrogen, methyl, ethyl or vinyl and R.sup.2 and R.sup.3 are each alkyl, cycloalkyl, aryl or aralkyl, or R.sup.2 and R.sup.3 together form a 1,4- or 1,5-alkylene group, in each case of not more than 8 carbon atoms, with the provisos that the sum of the number of carbon atoms in R.sup.2 and R.sup.3 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 is selected from the group consisting of formamide, acetamide, propionamide and the same compounds substituted by N-methyl or N,N-dimethyl, and which has a boiling point lower than that of the solvent I.

REFERENCES:
patent: 3951755 (1976-04-01), Sartorius et al.
patent: 4217460 (1980-08-01), Hohenschutz et al.
patent: 4262140 (1981-04-01), Bott et al.
patent: 4326073 (1982-04-01), Wolf et al.

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