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1. (WO1999008998) PROCESS FOR PRODUCING FORMAMIDE

Pub. No.:    WO/1999/008998    International Application No.:    PCT/JP1998/003656
Publication Date: Fri Feb 26 00:59:59 CET 1999 International Filing Date: Wed Aug 19 01:59:59 CEST 1998
IPC: C07C 231/02
C07C 233/03
Applicants: MITSUBISHI RAYON CO., LTD.

Inventors: IRIZAWA, Tadashi

OGURA, Kazumoto

TOGAWA, Hidetake

KAWARAGI, Mikiyoshi

TSUNEMI, Akira

Title: PROCESS FOR PRODUCING FORMAMIDE
Abstract:
A process for producing formamide through the reaction of methyl formate with ammonia, which comprises (1) reacting methyl formate with ammonia in a reactor in the presence of formamide in an ammonia to methyl formate molar ratio higher than 1, (2) feeding the reaction mixture to a separation column for low-boiling substances to distill off a low-boiling fraction through the column top, (3) taking out the residual liquid from the column bottom and feeding it to a product distillation column, (4) taking out formamide from the top of the product distillation column, and (5) discharging the high-boiling liquid fraction from the column bottom and circulating and feeding the fraction to the reactor or the separation column for low-boiling substances.