Process for the extraction of nonpolar constituents from plant material

US4946695A · kind A · utility

Assignee

• Hopfenextraktion HVG Barth, Raiser & Co. · DE

Inventors

• Adrian Forster · Wolnzach, DE
• Stefan Geyer · Dresden, DE
• Josef Schulmeyr · Wolnzach, DE
• Roland Schmidt · Lakewood, US
• Manfred Gehrig · Wolnzach, DE

Key dates

• Filing date: Mar 31, 1989
• Grant date: Aug 7, 1990
• Expiry date: Mar 31, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C12C3/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

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.