Bionorica Ag

Heinz-Walter Joseph

The invention concerns a method for obtaining dry plant extracts under mild conditions, in which a liquid plant extract is introduced into a vacuum drying equipment having a multi-shaft stirrer extending through a cylindrical mixing and drying chamber and with its own drive, together with a chopper rotating through a stator, and the liquid plant extract is dried at a vessel shell temperature of 20&#xb0; C. to 50&#xb0; C., a product temperature between 20&#xb0; C. and 40&#xb0; C., a pressure between 0.5 and 1,000 mbar, a stirrer rotation speed of greater than 0 to 10 rpm and a chopper rotation speed of 200 to 800 rpm, characterized in that the liquid plant extract is sprayed into the mixing and drying chamber through at least one nozzle above the liquid level in the latter, at a pressure differential of &#x3e;100 mbar between the drying chamber and the reservoir, whereby the nozzle(s) each create(s) a droplet spray cone of &#x2267;30&#xb0; in at least one spatial direction, the average droplet size of the liquid plant extract sprayed in is &#x2266;300 &#x3bc;m and the discharge capacity of the nozzle(s) is smaller than or equal to the evaporator capacity the drying equipment.

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Berg, Germany

Heinz-Walter Joseph