Obtaining anhydrous or substantially anhydrous formic acid...

Details Obtaining anhydrous or substantially anhydrous formic acid... Obtaining anhydrous or substantially anhydrous formic acid...

C - Chemistry, Metallurgy

07

C

202/69, 260/529.

C07C 51/377 (2006.01) C07C 51/09 (2006.01) C07C 51/44 (2006.01) C07C 51/48 (2006.01) C07C 53/02 (2006.01)

Patent

CA 1238919

ABSTRACT OF THE DISCLOSURE: Anhydrous of substantially anhydrous formic acid is obtained by hydrolysis of methyl formate by a process in which, methyl formate is hydrolyzed in the presence of a carboxamide of the general formula (I): Image (I) where R1 is alkyl or hydrogen, R2 is alkyl, R3 is hydrogen or a C1 to C4 alkyl, and R1 and R2 may form part of a 5- membered or 6-membered ring, and the sum of the carbon atoms in the radicals R1, R2 and R3 is from 1 to 14. The mixture formed during the hydrolysis is separated into its individual components in a first distillation column which is divided into a feed part and a take-off part by separating means which are effective in the longitudinal direction. During the process the hydrolysis mixture is fed into the feed part, while methanol and unreacted methyl formate are taken off as a top product and as a side product. Formic acid and the carboxamide of formula I (as extracting agent) are taken off as an anhydrous or substantially anhydrous bottom product. Water, preferably in liquid form, is removed from the take-off part. Finally the bottom product from the first distillation column is separated, in a second distillation column, into formic acid and the extracting agent. This process avoids decomposition of the products and does not require liquid-liquid extraction to remove water.

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