Henkel Kommanditgesellschaft Auf Aktien

Henkel Kommanditgesellschaft

Norbert Kuehne

Wilfried Raehse

Willi Wuest

Franz-Josef Carduck

Ansgar Behler

Jochen Jacobs

Horst Upadek

Manfred Biermann

Kathleen Paatz

Konrad Engelskirchen

Werner Pichler

Coated enzyme preparation for detergents and cleaning formulations

Process for the removal of inorganic salts

A process and apparatus for the separation and purification of cellulose ethers and other cellulose derivatives in a filter unit at relatively high temperatures and with narrow-mesh filters, employing a pressure vessel having candle filters to which pressure is introduced for separation of the suspension liquid, for the removal of residual liquid from the filter cake formed, and also for washing the filter cake.

Process for the separation and purification of cellulose ethers and

A process for working up aqueous, electrolyte-containing suspensions of highly swellable layer silicates by which highly swellable layer silicates are isolated substantially free from electrolyte from an aqueous electrolyte-containing suspension in a reasonable time by multi-stage membrane filtration wherein the second and every following membrane stage, the concentrate is diluted, for example with fully deionized water, to maintain pumpability.

Process for working up aqueous electrolyte-containing suspensions of

The invention is a process for the separation of biotechnologically produced valuable materials from a fermenter broth by crossflow microfiltration and/or ultrafiltration, in which at least two modules arranged in series and fitted with porous membranes are used per stage, to produce concentrate and a permeate which contains the valuable material. The pressure of the permeate is controlled so that the absolute pressure on the permeate side is at different absolute pressure in each module.

Process for the separation of biotechnologically produced valuable

The invention relates to a process for the separation of biotechnologically produced valuable materials form a cell suspension by crossflow microfiltration to obtain an high specific permeate flux while retention stays near 0% for long periods. To enable crossflow microfiltration to be carried out on an industrial scale in biotechnology in the separation of biotechnologically produced extracellular valuable materials from a cell suspension, particularly in the separation of alkaline protease for recovering enzyme, under economically acceptacle conditions, alkaline protease of relatively high molecular weight, more especially enzyme &gt;20,000 daltons, is separated from a fermenter solution using polysulfone tubes having micropore diameters of from 0.3 to 0.5 .mu.m at a rate of flow of the fermenter solution of from 3 to 6 m/s parallel to the membrane surface and with a pressure difference between the concentrate side and the permeate side of 2 bar, the ratio of the mean pore diameter of the membrane to the size of the microorganisms remaining in the concentrate being between 0.15 and 0.85

Crossflow microfiltration process for the separation of

An improved reactor (and process using the same) comprising multistage stirrer elements and baffles, which has particular dimensional ratios between the reactor diameter, the width and spacing of the stirrer elements, and the baffles. The reactor is particularly adapted for the production of polysaccharide ethers, especially cellulose ethers.

Reactor and its use in polysaccharide ether production

A process for the production of carboxyalkyl celluloses having an average degree of substitution of at least 1.0. The process comprises up to 3 stages, but without any intermediate purification. The preferred suspension medium is isopropanol. In each stage of the process, the carboxyalkylating agent is used in quantities of less than 2.5 moles per mole of anhydroglucose unit and the alkylating agent in quantities of less than 5 moles per mole of anhydroglucose unit. The total water content of the system throughout the reaction as a whole must not exceed 450% by weight, based on the quantity by weight of cellulose used. Water contents of from 80 to 250% by weight are preferred.

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Haan, Germany

Norbert Kuehne