Patents Assigned to Hopfen-Extraktrion HVG Barth, Raiser & Co.
  • Process for the production of decaffeinated tea
    Patent number: 4938977
    Abstract: 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.
    Type: Grant
    Filed: May 11, 1989
    Date of Patent: July 3, 1990
    Assignee: Hopfen-Extraktrion HVG Barth, Raiser & Co.
    Inventors: Manfred Gehrig, Adrian Forster