Quality of catalytically prepared polyalkylene polyamines

Abstract From the Canadian patent

Process for the improvement of the quality of polyalkylene polyamines prepared by the reaction of (1) ammonia and/or an alkyleneamine compound having at least two amino groups and an alkanolamine compound having at least one amino group in the presence of a catalytically effective amount of a metal acid phosphate and at a temperature and pressure sufficient to form the polyalkylene polyamine. When the polyalkylene polyamines, being produced by the process have a dark, black color which is measured as a Gardner Color Standard Number of at least 15 on the Gardner Color Scale and/or have a burnt or scorched odor the, inclusion of a sufficient amount of hydrogen with the ammonia and/or …