METHOD OF PRODUCING AMINOALKYLENE PHOSPHONIC ACID Russian patent published in 2014 - IPC C07F9/38 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing industrially used acids of formula: (X)_a[N(W)(Y)_2-a]_z, where X denotes optionally substituted C₁-C₂₀₀₀₀₀ linear, branched, cyclic or aromatic hydrocarbon, ZPO₃M₂, [V-N(K)]_n-K, [V-N(Y)]_n-V or [V-O]_x-V; where V denotes optionally substituted C_2-50 linear, branched, cyclic or aromatic hydrocarbon; Y = ZPO₃M₂, [V-N(K)]_n-K or [V-N(K)]_n-V; x = 1 to 50000; z = 0 to 200000 and ≤ the number of carbon atoms in X; a = 0 or 1; n = 0 to 50000; Z - C_1-6alkylene; M = H; W = H, X and ZPO₃M₂; K = ZPO₃M₂ or H. The method includes adding P₄O₆ to an aqueous reaction medium containing a homogeneous Bronsted acid, wherein P₄O₆ is hydrolysed to phosphorous acid, and said aqueous medium contains an amine of formula (X)_b[N(W)(H)_2-b]_z, where b = 0 or 1, and the amine is added at the same time as P₄O₆ or after hydrolysis of P₄O₆; water after hydrolysis from 0 to 40 wt %, pH during the entire hydrolysis period is kept below 5 with subsequent addition of formaldehyde and a homogenous Bronsted acid with pKa≤3.1 and a heterogeneous Bronsted acid, with the ratios: (a) phosphorous acid, (b) amine, (c) formaldehyde and (d) Bronsted acid: (a):(b) 0.05:1 to 2:1; (c):(b) 0.05:1 to 5:1; (c):(a) 5:1 to 0,25:1; and (b):(d) 40:1 to 1:5; where (a) and (c) denote the number of moles, (b) denotes the number of moles, multiplied by the number of N-H groups in the amine, (d) denotes the number of moles, multiplied by the number of available protons per mole catalyst.

EFFECT: novel efficient method of producing aminoalkylene phosphonic acids is disclosed.

14 cl, 10 ex