Degussa Aktiengesellschaft

Heike Kinz

Elfriede Sextl

Akos Kiss

Sems Yonsel

Stefan Stockhammer

Wiltrud Schafer-Treffenfeldt

Gerhard Zimmer

Wiltrud Schaefer-Treffenfeldt

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

Aqueous hydrogen peroxide solutions contain variable amounts of carbon compounds following their production by the so-called anthraquinone process. Various methods are known for separating out carbon compounds, including those using organic ion exchangers or macro-porous organic adsorber resins. Described is a process using a solid adsorption agent, which can be regenerated without causing any problems, whereby the carbon content is reduced. The solid adsorption agent is a zeolite from the set of dealuminised H-Y-zeolites with a (SiO.sub.2 /Al.sub.2 O.sub.3) ratio equal to or greater than 20 or H-mordenites with a (SiO.sub.2 /A1.sub.2 O.sub.3) ratio of at least 20.

Process for reducing the carbon content of aqueous hydrogen peroxide

A process for the separation of amino acids from aqueous solutions by adsorption on zeolites of different types. It is unnecessary to separate the biomass prior to the treatment.

Process for the separation of amino acids from aqueous solutions

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Hanau, Germany

Heike Kinz