New method for producing TETA by means of EDDN

摘要

A method for the production of triethylenetetramine (TETA) involves (a) reaction of ethylenediamine (EDA) with formaldehyde and hydrocyanic acid in a mol ratio of (1:1.5:1.5)-(1:2:2) to give ethylenediamine-diacetonitrile (EDDN), followed by (b) hydrogenation of EDDN in presence of a catalyst and a solvent. Independent claims are also included for (1) aminonitriles selected from piperazinylethylaminoacetonitrile (PEAN), aminoethyl-piperazinylacetonitrile (AEPAN) and cyanomethylpiperazinyl-ethylaminoacetonitrile (CMPEAN) (2) a method for the production of the above aminonitriles by reacting aminoethylpiperazine (AEPip) with formaldehyde cyanhydrin (FACH) .