Basf Aktiengesellschaft

Wintershall Holding Gmbh

Basf Se Corporation

Jörg Therre

Hartwig Voβ

Wolfgang Siegel

Klaus Ebel

Gerd Kaibel

Udo Rheude

Werner Aquila

Hermann Gies

Stephan Freyer

Matthias Kiefer

Rajan Hollmann

Andrea Herold

Bernd Marler

Thomas Letzelter

Julia Kristiane Schmidt

Melanie Pahl

Carsten Groning

Tobias Käppler

Christian Fleck

Sascha Rollie

Florian Lehr

Bernd Leonhardt

Tillmann Faust

Carsten Schwalb

Andrea Hlubek

Hansjörg Rettenmaier

Ulrich Schafer-Luderssen

The presently claimed invention is directed to a method for the preparation of an aqueous solution comprising at least one beta-glucan comprising at least the steps of a) fermentation of at least one fungal strain in an a fermentation broth, b) addition of at least one acid to the fermentation broth to adjust the pH to a value in the range of &#x2265;2.0 to &#x2264;4.0 and c) filtration of the fermentation broth to obtain an aqueous solution comprising the at least one beta-glucan and at least one beta-glucan that is obtained by this method.

Method for preparing an aqueous solution of beta-glucan

A process for the preparation of aqueous solutions of glucans having a &#x3b2;-1,3-glycosidically-linked main chain and side groups having a &#x3b2;-1,6-glycosidic bond by fermentation of fungal strains. The fungal strains secrete the glucans into the fermentation broth, in an aqueous culture medium, and the separation of the glucans from the fermentation broth is effected using asymmetrical filter membranes.

Process for the preparation of homopolysaccharides

The present invention relates to template-free clathrasils whose framework comprises essentially SiO, wherein the crystals of the clathrasils have the platelet-like morphology of a sheet silicate. The present invention further relates to a process for preparing these template-free clathrasils and also to their use as absorbent, as seed crystals for the synthesis of clathrasil membranes of the same zeolite type and in the form of dense layers which function as gas separation membranes having a molecular sieving action.

Template-free clathrasils and clathrasil membranes

A process for preparing glyoxal monoacetals of the formula I, ##STR1## where R.sup.1 and R.sup.2, which can be identical or different, are C.sub.1 -C.sub.4 alkyl or C.sub.2 -C.sub.4 alkenyl involves reacting a mixture of glyoxal and glyoxal bisacetals of the formula II, ##STR2## where R.sup.1 and R.sup.2 have the meaning given above, with an excess of an alcohol of the formula R.sup.1 OH or R.sup.2 OH or mixtures of these in the presence of an acid catalyst until reaction equilibrium is achieved.

Preparation of glyoxal monoacetals

Allyl alcohols are isomerized in aqueous solution in the presence of protonic acids, with the pH of the reaction mixture being adjusted to the range from 2 to 5 with an acid concentration below 0.16 mol per liter of the reaction mixture or with a buffer which comprises the protonic acid.

Isomerization of allyl alcohols

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Worms, Germany

Jörg Therre