Degussa Aktiengesellschaft

Degussa - Huls Ag

Stefan Stockhammer

Elfriede Sextl

Wiltrud Schafer-Treffenfeldt

Karlheinz Drauz

Akos Kiss

Gunter Knaup

Gerard Richet

Andrea Preuss

Sems Yonsel

Heike Kinz

Wiltrud Schaefer-Treffenfeldt

Wiltrud Treffenfeldt

Gunter Weissland

A process for the separation and purification of pyrimidine derivatives, such as tetrahydropyrimidines, in particular 1,4,5,6-tetrahydro-2-methyl-4-pyrimidinecarboxylic acids (ectoine) from aqueous solutions by a combination of adsorption using inorganic solids and crossflow filtration.

Process for the separation of pyrimidine derivatives from aqueous

Process for separating and/or isolating organic compounds which are soluble in water, some of which are adsorbed on finely divided inorganic solids, by adsorption of this fraction and isolation of the loaded solid, which is characterised in that

Cross-flow filtration process for separating organic compound by

The invention relates to a process for removing amino acids and/or aminosulphonic acids from preferably aqueous solutions which contain these as impurities by adsorbing the amino acids on zeolites. Solutions to which the process according to the invention can be applied are produced, for example, from the industrial synthesis of oligopeptides in which the amino acids serving as starting materials are always present in solution, sometimes to a not inconsiderable residual concentration, together with the desired end product.

Process for separating amino acids and aminosulponic acids through

The invention relates to the removal of hydroxymonocarboxylic acids and tricarboxylic acids from aqueous solutions by adsorption on zeolites with a modulus of up to 400.

Process for isolating hydroxymonocarboxylic and tricarboxylic acids

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Freigericht, Germany

Stefan Stockhammer