Thyssenkrupp Industrial Solutions Ag

Uhde Inventa-fischer Gmbh

Uhde Gmbh

Thyssenkrupp Uhde Gmbh

Wolfgang Tietz

Peter Wasserscheid

Joachim Schulze

Rainer Hagen

Armin Börner

Udo Muhlbauer

Udo Mühlbauer

Shashank Ghanegaonkar

Klaus Kuehlein

Klaus Kühlein

Klaus-Dieter Göhler

Adam B Verweij

Isabel Waengler

Willi Techlin

Ivan Shuklov

Adam Bastiaan Verweij

Klaus-Dieter (deceased) Goehler

Andreas BÖSMANN

Klaus-Dieter GÖHLER

Disclosed is a test and test apparatus used to determine whether lactic acid is suitable for polymerization. The test apparatus comprises a) means for the polycondensation of the lactic acid to form a pre-polymer, b) means for depolymerization of the prepolymer to form dilactide, and c) means for carrying out analytical methods to determine at least one of the dilactide yield and/or the racemization, wherein lactic acid which is suitable for polymerization exhibits a dilactide yield of &#x3e;90% and a racemization of &#x3c;5%.

Quality test for polymerizable lactic acid and method for producing same

Disclosed is a method for removing and purifying carboxylic acids from fermentation broths, comprising removing biomass and any solids present from the fermentation broth, finely cleaning up the biomass-free and solids-free fermentation broth by nanofiltration, and removing the carboxylic acid from the finely cleaned, biomass-free, and solids free fermentation broth by adsorption to one or more solid phases having tertiary amino groups.

Method for purifying carboxylic acids from fermentation broths

A mixture of cyclic diesters derived from lactic acid and in cases a mixture of a racemate of dilactide may be produced in several different processes. In some instances, the process can thereby start from the corresponding alpha-hydroxycarboxylic acids, the corresponding cyclic diesters or oligomers of the corresponding alpha-hydroxycarboxylic acids.

Method for the production of a mixture of lactide derivatives

A process for removing, isolating and purifying dicarboxylic acid from fermentation broths, which includes the following steps: 1) removal of the biomass and any solids present from the fermentation broth in two successive stages, 2) removal of the dicarboxylic acid solution from the biomass-free fermentation broth by simulated moving bed (SMB) chromatography, 3) fine purification of the dicarboxylic acid solution, 4) multistage evaporative concentration and crystallization, and 5) separation and drying of the crystals.

Process for removing, isolating and purifying dicarboxylic acids

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Biendorf, Germany

Wolfgang Tietz