PROCESS FOR PRODUCING AMINO METHYLENE PHOSPHONIC ACIDS
1334834 Preparing aminomethylene phosphonic acids JON A BENCKISER GmbH 19 May 1972 [30 June 1971] 23696/72 Addition to 1278030 Heading C2P An aminomethylene phosphonic acid is obtained by reacting an N-substituted alphaamino mono- or poly-carboxylic acid or an alkali metal salt thereof with phosphor...
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Zusammenfassung: | 1334834 Preparing aminomethylene phosphonic acids JON A BENCKISER GmbH 19 May 1972 [30 June 1971] 23696/72 Addition to 1278030 Heading C2P An aminomethylene phosphonic acid is obtained by reacting an N-substituted alphaamino mono- or poly-carboxylic acid or an alkali metal salt thereof with phosphorous acid at 90 to 160 C. in the presence of a dehydrating agent, e.g. acetic- or propionic-anhydride, P 2 O 5 or concentrated H 2 SO 4 . The process is suitably effected by heating the phosphorous acid to above 90 C., e.g. to 110-130 C., adding the amino acid with stirring and then adding the dehydrating agent slowly to the mixture, followed by further stirring preferably at between 120 and 140 C. Examples are given for the production of nitrilo-tri(methylene phosphonic acid) and ethylene diamine tetra(methylene phosphonic acid). |
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