Nouryon Chemicals International B.v.

Akzo Nobel Chemicals International B.v.

Hubertus Johannes Jongen

Adrianus Maria Reichwein

Marjolein Groote

Martin Heus

Elwin Schomaker

Roy Gérard Doppen

Albertus Jacobus Maria Bouwman

The present invention relates to alanine N-acetic acid precursors of formula (i) COOM-CH(CH3)&#x2014;NH&#x2014;(CH2CN), wherein M is hydrogen (alanine N-monoacetonitrile), or (ii) COOM-CH(CH3)&#x2014;N&#x2014;(CH2CN)2, wherein 0 to 50% of all M is sodium or potassium and 50 to 100% of all M is hydrogen (alanine N,N-diacetonitrile and its partial sodium or potassium salts) comprising L-alanine to D-alanine in a range of from 75:25 to 50:50 (L:D), or (iii) COOM-CH(CH3)&#x2014;N&#x2014;(CH2CONH2)2, wherein M is hydrogen (alanine N,N-diacetamide), in the form of crystals, and relates to a process to prepare these precursors and their use, especially to give MGMA or MGDA.

Crystals of alanine N-acetic acid precursors, process to prepare them and their use

The present invention relates to a process to prepare N,N'-di(2-hydroxybenzyl) ethylenediamine-N,N&#x2032;-diacetic acid and salts thereof (HBED) comprising a reaction between formaldehyde, ethylenediamine diacetic acid or a salt thereof (EDDA) and phenol, wherein the reaction mixture contains 0.2 to 1.1 molar equivalents of alkali metal ions on the basis of the molar amount of EDDA and the reaction mixture is processed by a step in which at least part of the organic compounds other than the formed HBED are removed from the reaction mixture, and optionally recycled, during which step at least 50% and up to and including 100% of the alkali metal ions in the reaction mixture are potassium ions, to products obtainable by such process and their use.

Process to prepare phenolic ethylenediamine diacetic acid compounds

The present invention relates to a process to prepare N,N'-di(2-hydroxybenzyl) ethylenediamine-N,N&#x2032;-diacetic acid and salts thereof comprising a reaction between formaldehyde, ethylenediamine diacetic acid or a salt thereof and phenol at a pH of between 3 and 7 and a temperature below 60&#xb0; C. wherein the reaction mixture contains 0.2 to 1.1 molar equivalents of alkali metalions on the molar amount of EDDA.

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Gendringen, Netherlands

Hubertus Johannes Jongen