Hag Gf Aktiengesellschaft

Nateco2 Gmbh + Co. Kg

Hopfen-extraktion Hvg Bart, Raiser & Co.

Hopfenextraktion Hvg Barth, Raiser & Co.

Hopfen-extraktrion Hvg Barth, Raiser & Co.

Manfred Gehrig

Josef Schulmeyr

Stefan Geyer

Adrian Forster

Roland Schmidt

Otto G Vitzthum

Peter Werkhoff

Manfred Barthels

Birgit Forchhammer

Karin Simon

Hans Wienges

Martin Ketterer

A pressure vessel arrangement comprises an external pressure vessel and at least one insert basket in the pressure vessel for receiving a substance to be treated which is exposable to a pressure fluid which is feedable to the pressure vessel and the insert basket. There is provided a control device for the internal pressure prevailing in the insert basket, in particular in the form of a switchable pressure compensation line connecting the interior of the insert basket directly to the surroundings, i.e. not via the pressure vessel.

Pressure vessel arrangement comprising an external pressure vessel and at least one insert basket

The invention relates to a method for decaffeinating tea (). The method involves of using, as an extraction agent, a carbon dioxide which is compressed of a pressure greater than 50 and up to 100 MPa.

Method for decaffeinating tea

This invention relates to a process for extracting nonpolar constituents from natural substances such as hops with simultaneous separation of residues of nonpolar plant protectives (fungicides/insecticides). In a first step, the plant protective as well as other ingredients that are soluble under the chosen conditions is extracted with compressed gases, and in a subsequent stage, the dissolved mixture is passed through an adsorbent and the plant protective is selectively removed from the mixture.

Process for the extraction of nonpolar constituents from plant material

By the extraction with CO.sub.2 at 60 to 150 bar and 20.degree. to 70.degree. C., an aroma enriched fraction is taken from the moistened black tea, said fraction being added again to already decaffeinated and dried tea. Decaffeination starts after the aroma fraction has been obtained by pumping carbon dioxide at a pressure of between 150 to 500 bar and a temperature of between 10.degree. to 100.degree. C. through a bulk moistened tea. The solvent charged with caffeine is passed over an adsorber or purified by reduction of density.

Process for the production of decaffeinated tea

The invention relates to a process for extracting nonpolar constituents from hops with simultaneous separation of residues of nonpolar plant protectives. In a first step the plant protective as well as other ingredients that are soluble under the chosen conditions are extracted with compressed gases, and in a subsequent stage the dissolved mixture is passed through an adsorbent and the plant protective is selectively removed from the mixture.

Process for the extraction of nonpolar constituents of hops

There is provided a novel procedure for the extraction of a high proportion of the potential bitterness resins from hops by extracting the hops with super critical carbon dioxide at pressures of about 100 to 300 bar temperatures above 100.degree. C.

Process for the extraction of hop substances

The invention relates to a process for recovering caffeine adsorbed to activated carbon by treating the loaded activated carbon with formic acid.

Recovery of caffeine adsorbed to activated carbon

The invention relates to a process for recovering caffeine adsorbed to activated carbon with simultaneous regeneration of the activated carbon in which the caffeine-loaded activated carbon is treated with water at a pressure of at least 86 bar and at a temperature of at least 300.degree. C.

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Wolnzach, Germany

Manfred Gehrig