Duphar International Research Bv

Glatt Gmbh

Robert Grande

Dietmar C Naunapper

Harrie R De Lange

Mathieu J Van Dam

Cornelis J De Kluizenaar

Karlheinz J Wehrle

The invention relates to a method of isolating sterols in commercial quantities from sterol-containing material by subjecting a solution of this material to a column-chromatographic separation; for isolating cholesterol from cholesterol-containing material, silica gel is preferably used as a column packing and a mixture of, for example, heptane and acetone is preferably used as an eluent.

Method of isolating sterols in commercial quantities from

The invention relates to a method of drying a solid wetted with a solvent or solvent mixture by causing superheated vapour of the solvent or solvent mixture as a carrier medium to flow through the material to be dried in an evaporation room, the solvent or solvent mixture evaporating and being carried along with the carrier medium, and by then causing the evaporated solvent or solvent mixture to condense from the carrier medium, if desired after compression thereof, in a cooling device. During this drying process a sub-ambient pressure is provided in the evaporation room and the temperature in the evaporation room is controlled by adjusting the sub-ambient pressure, if desired, in combination with an additional temperature controlling means. The inventiona also relates to a device for using the above method.

Method and apparatus for drying a solid material wetted with a solvent

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Weesp, Netherlands

Robert Grande