FREMGANGSM}TE TIL KONTINUERLIG FREMSTILLING AV NITRILOTRIACETONITRIL

1303788 Nitrilotriacetonitrile KNAPSACK AG 22 April 1971 [26 May 1970] 10791/1 Heading C2C Nitrilotriacetonitrile (NTN) is made by reacting a salt of ammonia with a non-oxidizing acid with formaldehyde and HCN in an aqueous acid phase, at 50-110‹ C., completing the reaction, and separating the reaction mixture into firstly crystalline NTN and secondly an aqueous acid phase as the mother liquor, which comprises subjecting a product obtained by primary reaction of an aqueous solution of the said ammonium salt with an aqueous formaldehyde solution, the said ammonium salt and the said formaldehyde being used in a molar ratio greater than 1: 6, to reaction with a stoichiometric proportion being based on the amount of formaldehyde which has reacted with the ammonium salt in the said primary reaction.