Akzo Nobel N.v.

Akzo Nobel Chemicals International B.v.

Teijin Twaron B.v.

Nouryon Chemicals International B.v.

Hans Lammers

Martin Heus

Tjerk Oedse Boonstra

Martinus Catharinus Tammer

Adrianus Maria Reichwein

Arie Volmer

Johannes Albertus Maria Meijer

Willem Koelewijn

Jim Lepage

Hendrikus J M Busschers

Willem G Haanstra

Wilhelmus Joannes Theodorus Maria Appelman

Johannes Wilhelmus Franciscus Lucas Seetz

Joldert Faber

Johannes Albertus Meijer

Process and station for stabilizing an aqueous solution of an iron salt of an organic acid with a ferric component and a ferrous component of less solubility than the ferric component, such as the aqueous solution based on the Fesalt of meso-tartaric acid. To stabilize the content of the dissolved ferric salt, the solution is at least partly subjected to electrolytic oxidation.

Stabilization of an aqueous solution of an organic iron salt

The present invention relates to a process comprising the reaction of a cyanide with an amino acid and an aldehyde, characterized in that the cyanide is a cyanide salt, the amino acid is aspartic acid and/or glutamic acid in the acidic form, and the process is performed under acidic pH by the addition of between 0 and 1 equivalent of an acid based on the amount of aspartic or glutamic acid.

Process to prepare a chelating agent or precursor thereof using a cyanide salt

The present invention relates to a process comprising the reaction of a cyanide with a hydrogen cyanide-reactive compound, characterized in that the cyanide is a cyanide salt and the process is an electrochemical process involving the transporting of a reaction mixture to which cyanide salt has been added through an electrochemical cell, in which process the cyanide salt reacts with the hydrogen cyanide-reactive compound while at least partly under the influence of an electric current the cyanide salt is acidified and the salt cation content is reduced.

Electrochemical process to prepare chemicals using a cyanide salt

The invention relates to a process for the production of an amino acid having at least one secondary or tertiary amino group and three or more carboxyl groups or its salt with less than an equivalent of alkaline metal based on the number of carboxyl groups, said process comprising reducing alkali metal ions from an aqueous solution of an alkali metal salt of an amino acid having at least one secondary or tertiary amino group and three or more carboxyl groups and acidifying the amino carboxylate starting material by first performing a chemical acidification step using an organic or inorganic acid to get a compound in which at least one of the groups is protonated, and in a subsequent step further acidifying the amino carboxylate starting material and reducing alkali metal ions from an aqueous solution of the partially acidified alkali metal salt of the amino acid having at least one secondary or tertiary amino group and three or more carboxyl groups by electrodialysis, wherein the electrodialysis is performed using a hydrogen ion permselective membrane on the anode side and a cation-permeable membrane on the cathode side.

Process to prepare amino acid-N, N-diacetic acid compounds

The present invention provides a process to prepare a halogenated carbonyl group-containing compound by electrochemically reacting the corresponding carbonyl group-containing compound with a hydrogen halide H&#x2014;X, an organic halide R'&#x2014;X and/or a halide salt M&#x2014;Xunder substantially water-free conditions, wherein X is a chlorine, bromine or iodine atom, R&#x2032; is an alkyl or aryl group that may be linear or branched, optionally containing one or more heteroatoms such as oxygen, nitrogen, chloride, bromide, fluoride or iodide of which the halogen atom X can be electrochemically split off, Mis a quaternary ammonium, alkaline earth metal, alkali metal or metal cation, and n is an integer of 1 to 5, depending on the valency of the metal cation M.

Electrochemical process to prepare a halogenated carbonyl group-containing compound

The invention pertains to an aqueous solution of a sodium salt xNayHof the chelating compound of formula I: wherein x=2.1&#x2013;2.7, y=0.9&#x2013;0.3, and x+y=3. The invention further pertains to a container comprising at least 0.5 kg of said aqueous solution and to a method of preparing an aqueous solution comprising at least 45 wt % of the sodium salt xNayHof the chelating compound of formula I from Na-HEDTA, comprising the steps of electrodialysing an aqueous solution containing less than 42 wt % of Na-HEDTA using a bipolar membrane, thereby converting the trisodium salt solution to the solution of the sodium salt of formula I with x=2.1&#x2013;2.7, y=0.9&#x2013;0.3, and x+y=3.

Aqueous solution of a sodium salt of HEDTA

A process for determining the polymer concentration in a spinning dope solution involves measuring the propagation velocity of ultrasonic sound in the solution. The process prevents fluctuations in the polymer concentration as much as possible, and is therefore highly suitable for application in the production of fibers with consistent properties. An ultrasonic device used in the process is easier to clean, install, and calibrate than other presently commercially available devices.

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Arnhem, Netherlands

Hans Lammers