Method for producing n-phosphonomethyl iminodiacetic acid

摘要

The invention relates to a method for producing N-phosphonomethyl iminodiacetic acid by reacting iminodiacetic acids with phosphorous acid and formaldehyde in an aqueous solution, in the presence of a strong mineral acid. The invention is characterised in that the reaction is carried out at a temperature of 110 to 150 DEG C in an atmosphere containing inert gas. The main advantages of this method are the high yields and purity with regard to the N-phosphonomethyl iminodiacetic acid and the almost stoichiometric need for educts, in addition to the lower quantity of waste that is associated with the same.