Mixed solvent extraction of hops
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United States of America Patent
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Mar 26, 1985
Grant Date -
N/A
app pub date -
Feb 3, 1982
filing date -
Feb 3, 1982
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Expired
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Abstract
An improved process for the selective extraction of the alpha acids contents of hops using liquid carbon dioxide as solvent is described. Solubility of the alpha acids in liquid carbon dioxide is enhanced by addition of a minor amount of a selected organic substance which: (1) is non-reactive with the alpha acids of interest, and (2) has the following physical properties: (a) is completely soluble in liquid carbon dioxide in the operating conditions and concentrations employed, and (b) is itself a solvent for the alpha acids of interest. Preferably the organic substance is a 1 to 4 carbon atom aliphatic alcohol in an amount of about 0.1 to about 30 volume percent.
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