- Process for the manufacture of alkylamino alkylene phosphonic acids
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A process for the manufacture of alkylamino alkylene phosphonic acids is disclosed. In detail, a specific phosphonate is reacted with an agent selected to yield an alkylamino moiety substituted by a radical selected from OH, OR', NH2, NHR', N(R')2, NH, N, S, S-S and SH in aqueous alkaline medium having a pH of 8 or higher at a temperature of 0°C or higher.
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Page/Page column 6; 7
(2008/12/06)
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- Process for the manufacture of aminopolyalkylene-phosphonic acid compounds
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A beneficial method for the manufacture of amino polyalkylene phosphonic acids, under substantial absence of hydrohalogenic acid, is disclosed. The method, in essence, is based on reacting narrowly defined ratios of phosphorous acid, an amine, a formaldehyde in presence of specific ranges of an acid catalyst having a pKa equal or inferior to 3.1. The inventive method is capable of yielding economically and quality operational/capacity advantages, in particular significantly reduced one-step cycle duration under exclusion of corrosion disadvantages and also is environmentally friendly without requiring, in that respect, anything more than nominal capital expenditures.
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Page/Page column 9; 13-14
(2008/06/13)
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