Process for purifying aminomethylenephosphonic acids

Details Process for purifying aminomethylenephosphonic acids Process for purifying aminomethylenephosphonic acids

C - Chemistry, Metallurgy

07

F

260/530, 260/237

C07F 9/38 (2006.01) C07F 9/02 (2006.01) C07F 9/547 (2006.01) C07F 9/6524 (2006.01)

Patent

CA 2020950

High purity ethylenediaminetetra(methylene- phosphonic acid) and 1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetra(methylenephosphonic acid) are prepared by dissolving the aminomethylenephosphonic acid in an aqueous base, acidifying with a mineral acid at an elevated temperature to precipitate the crystals, maintaining the solution at an elevated temperature for a period of time sufficient to assure crystallization, cooling to a lower temperature and maintaining at that temperature for a time sufficient to precipitate the crystals and filtering the resulting crystals at that temperature, washing the crystals with water and recovering the desired high purity aminophosphonic acid. The ethylenediaminetetra(methylenephosphonic acid) is obtained in a purer state during its synthesis if the crystals are filtered hot without prior cooling.

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