Hoechst Aktiengesellschaft

Clariant Corporation

Guenther Welt

Manfred Ziegelmayer

Manfred Sponheimer

Reinhard Doenges

Josef Hilbig

In the process and the apparatus, a gas stream is divided into three partial gas streams. The first partial gas stream transports the material to be ground into the grinding and friction space of a mill (26), while the second partial gas stream runs around the friction space in the mill. The third partial gas stream is connected to the output side of the mill and takes up the reduced and dried ground material, transported out of the mill by the first and second partial gas streams, in order to transport it to a separator (30).

Process and apparatus for simultaneously grinding and drying a material

Process and apparatus for simultaneously grinding and drying material to

A process and apparatus for screening cellulose ethers which have a finely fibrous or wad-like or woolly structure, wherein the process comprises the following steps:

Process for screening cellulose ethers

The present invention relates to a process and a device for selectively separating the solvents employed in the preparation and purification of products. In this connection the different solvents are removed from the product to be treated by means of mechanical separation and subsequent admission of steam, and are collected separately. As a result of this, mixing of solvents from the preparation and from the purification is avoided, so that the working up of a solvent mixture is superfluous. The proces and the device are preferably used in the process for producing starch ethers and cellulose ethers.

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Gau-Bischofsheim, Germany

Guenther Welt