Continuous preparation of formamide

Details Continuous preparation of formamide Continuous preparation of formamide

C - Chemistry, Metallurgy

07

C

202/87, 260/556.

C07C 102/06 (1985.01) C07C 103/127 (1985.01)

Patent

CA 1213611

Abstract of the Disclosure: Formamide is prepared con- tinuously from methyl formate and ammonia, pure methanol being recovered, by a process wherein a) the reaction of methyl formate and ammonia is carried out predominantly in the liquid phase in the upper region of a reaction column R having a total of from 15 to 30 theoretical plates, b) the methanol formed in this reaction is removed, together with small amounts of formamide, from the column or the evaporator in vaporous form at the level of plates 1 - 5 (counted from the bottom), c) the formamide is removed from this methanol/ formamide mixture, together with small amounts of metha- nol, in a distillation column Dl and recycled to R, and d) the small amounts of methanol contained in the bottom product from R, which substantially consists of formamide and in this column should be at from 110 to 130°C, are separated off in a distillation column D2.

396091

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