Wintershall Aktiengesellschaft

Wacker-chemie Gmbh

Wintershell Ag

Kai-Udo Sewe

Fritz Wagner

Walter Lindorfer

Walter Lindoerfer

Hans-Jurgen Hofmann

Willibald Burger

Michael Geck

Wilhelm Jahn-Held

Walther Schulz

Christoph Syldatk

Ludwig Esterbauer

Siegmund Lang

Zu-yi Li

Burkhard Ziebolz

Uwe Matulowic

Reinhard Mueller-Hurtig

Axel Oberbremer

Wendelin Dewenter

Egbert Ristau

Method for drying out rock containing immobile formation water within

The microbial decontamination of soils contaminated with hydrocarbons, in particular with mineral oils, by microbial oxidation is improved by a process in which in addition to supplying the oxygen necessary for degradation, by aeration, soluble nutrients, water and soluble or dispersed biosurfactants as such or mixed with chemical surfactants are metered into the contaminated soils directly or into the removed contaminated soil layers, in one or more batches at time intervals, in an amount such that the formation of toxic intermediates which slow down or block microbial degradation in prevented, the accessibility of mineral oils and their products for the microorganisms is simultaneously increased and, as a result, accelerated, virtually complete mineralization by respiration to CO.sub.2 and H.sub.2 O is effected.

Microbial decontamination of soils contaminated with hydrocarbons, in

Solid particles of various sizes are separated from viscous liquids, for example biomass from liquids of biotechnological processes, by pressure filtration by subjecting the inhomogeneous or homogenized suspension, without or after only a little dilution, to a pressure filtration whereby the solid particles of various sizes are retained according to size in a plurality of, in particular in from 1 to 3, superposed or juxtaposed filter stages on filter layers of various depths and on filter surfaces and are separated from the viscous liquid.

Separation of solid particles of various sizes from viscous liquids

Rhamnolipids with high surface activity are produced micro iologically in high yield per g of dry cell substance using Pseudomonas spec. DSM 2874 in the form of growing, resting and immobilized cell mass in an aqueous medium containing at least one assimilable carbon source at a pH of 6.7 to 7.3 and a temperature of 30.degree. to 37.degree. C. Two new rhamnolipids with only one .beta.-hydroxydecanoic acid residue in the molecule and defined as .alpha.-L-rhamnopyranosyl- and 2-O-.alpha.-L-rhamnopyranosyl-.alpha.-L-rhamnopyranosyl-.beta.-hydroxydeca noic acid with a molecular weight of 334 and 480, respectively, are obtained.

Process for the biotechnical production of rhamnolipids including

Anionic, surface-active trehalose lipids, in which different organic acids are bound to a trehalose molecule by an ester linkage, are prepared by aerobically cultivating trehalose-producing microorganisms, capable of assimilating hydrocarbons, under growth-limiting conditions, but without limiting the oxygen.

Trehalose lipid tetraesters

Growing community of inventors

Barnstorf, Germany

Kai-Udo Sewe