Patent ID: 6316621
Filing Date: 2001-11-13
Classification: B01J,C07D

Abstract:
A method for preparing triethylenediamine comprising contacting, under reaction conditions sufficient to produce triethylenediamine, a compound selected from the group consisting of hydroxyethylpiperazine, crude hydroxyethylpiperazine, N-aminoethyl piperazine, and ethanolamines, with a catalyst comprising a combination of an alkaline earth metal hydrogen phosphate and an alkaline earth metal salt wherein the molar ratio of phosphorus to alkaline earth metal in the combination is less than 1, said catalyst prepared by combining an aqueous phosphoric acid solution with an aqueous slurry of a substantially insoluble alkaline earth metal salt such that the molar ratio of phosphoric acid to alkaline earth metal salt is less than 1, to form a precipitate of the alkaline earth metal hydrogen phosphate containing residual alkaline earth metal salt, and filtering and drying the precipitate.