FIELD: chemistry.
SUBSTANCE: aminopolyalkylene phosphonic acid is obtained in the presence of not more than 0.4 wt % halogen of hydrogen acid with respect to phosphorous acid, wherein all N-H groups of the amine are converted to 50% or more of the corresponding alkylene phophonic acids. Reaction of phosphorous acid (a), amine (b) and formaldehyde (c) takes place in the presence of an acid catalyst (d) with pKa ≤ 3.1, which is homogeneous with respect to the reaction medium, in the ratio: (a):(b) between 0.1:1 and 1.5:1, (c):(b) between 0.2:1 and 2:1, (c):(a) between 3:1 and 0.5:1 and (b):(d) between 40:1 and 1:5, where (a) and (c) denote number of moles, (b) denotes number of moles multiplied by number of N-H groups in the amine, (d) denotes number of moles multiplied by number of free protons in one mole of catalyst.
EFFECT: shorter duration of the single-step cycle, prevention of corrosion, achieving better environmental and economical factors.
20 cl, 64 ex, 35 tbl
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Authors
Dates
2010-10-27—Published
2005-11-07—Filed