C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
202/84, 260/529.
C07C 53/02 (2006.01) C07C 51/09 (2006.01) C07C 51/48 (2006.01)
Patent
CA 1135282
Abstract of the disclosure: Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein a) methyl formate is hydrolyzed, b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained, c) the bottom product of distillation (b), con- sisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid, d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation, e) the top product obtained from this distil- lation and consisting of all or part of the water intro- duced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distil- lation column of stage (b), f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separ- ated by distillation into anhydrous or substantially anhydrous formic acid and the extractant, and e) the extractant leaving stage (f) is recycled to the process.
348294
Block Ulrich
Bott Kaspar
Kaibel Gerd
Schmidt Rudolf
Schoenmakers Hartmut
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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