Akzo Nobel N.v.

Akzo Nobel Chemicals International B.v.

Axel Carstens

Martin Heus

Tjerk Oedse Boonstra

Manfred F Bergfeld

Ludwig Eisenhuth

Cornelia Adriana De Wolf

Adrianus Maria Reichwein

James N LePage

Edwin Rudolf Antony Bang

Johanna Hendrika Bemelaar

Jim Lepage

Christian Blaufelder

Alexey Borisovich Zaitsev

Wouter Jan Veenis

Reinhard Broucek

Hartmut Ahrens

The present invention relates to a chelating agent precursor that contains glutamic acid N,N-diacetic acid (GLDA) and/or methylglycine N,N-diacetic acid (MGDA) wherein at least one of the carboxylic acid groups is present as a carboxylic acid derivative selected from the group of amides, anhydrides, and esters, combinations thereof, and salts thereof, provided that it is not the triethyl ester of GLDA, the triethyl mono-t-butyl ester of GLDA, the tri-t-butyl ester of GLDA, the monobenzyl tri-t-butyl ester of GLDA, any ester or amide that contains azacycloalkane groups, any amide that contains biotin groups, any amide that contains minoethylcarbamoyl based amide groups, (S)-diethyl 2,2'-(1-benzyloxy)-1,5-dioxo-5-(prop-2-ynylamino)pentan-2-ylazanediyl-diacetate, diethyl 2,2&#x2032;-(5-(3-azidopropylamino)-1-(benzyloxy)-1,5-dioxo-pentan-2-ylazanediyl-diacetate, the trimethyl ester of MGDA, the monomethyl ester dimethylamide of MGDA, the dibenzyl ester of MGDA, the dibenzyl mono t-butyl ester of MGDA, the di t-butyl ester of MGDA, the di-t-butyl-monobenzyl ester of MGDA, N,N-bis(benzyloxycarbonylmethyl)-N&#x2032;-methoxycarbonyl-methyl-alanine amide, or N,N-bis(tert-butoxycarbonyl)-N&#x2032;-methoxycarbonylmethyl-alanine amide, and esters of GLDA immobilized on a gel, and that the amide is not the amide of ammonia, to a fluid containing the above chelating precursor and a liquid, and to the use of a chelating agent precursor of MGDA and GLDA and fluids containing them in an application wherein delayed acidity or the chelating capacity is useful, such as in descaling, bleaching, cleaning, and treating oil and/or gas-containing subterranean formations.

Chelating agent precursors, fluids containing them, and their use

The present invention relates to new salts, complexes, crystals, solutions, dispersions, and slurries of threonine-N,N-diacetic acid or derivatives thereof, to formulations containing those, to processes to prepare those, and to the use thereof.

Salts, crystals, complexes, and derivatives of threonine diacetic acid, a process to prepare threonine diacetic acid, and the use thereof

The present invention relates to glutamic acid N,N-diacetic amide, potassium or sodium glutamate N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, potassium or sodium glutamate N-acetic amide N-acetonitrile, to processes to prepare such compounds and the use thereof.

Glutamic acid N,N-diacetic amide, glutamic acid N-acetic amide N-acetonitrile, alkali metal salts thereof, process to prepare them and their use

The invention relates to a process for preparing betaines of formula (I) wherein R represents a C -C hydrocarbon group, and R and R independently represent a C -C hydrocarbon group, comprising reacting an aqueous solution of an ethoxylated quaternay ammonium compound of formula (II) wherein R , R , and R have the same meaning as described above and X represents a suitable anion, with oxygen or an oxygen-containing gas under alkaline conditions in the presence of a supported and promoted Pt catalyst at a temperature ranging from room temperature to 70&deg; C. Preferably, use is made of a Pt/Bi/C catalyst. The invention process is particularly suitable for converting choline chloride into betaine, which is used as an animal feed

Process for preparing betaines

Process for producing ester quats

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Kleve, Germany

Axel Carstens