Ellen Y Lin

US Patent:

47556188, Jul 5, 1988

Filed:

Jun 2, 1987

Appl. No.:

7/057352

Inventors:

Duane A. Bude - St. Louis County MO
Ellen Y. Lin - Chesterfield MO

Assignee:

Anheuser-Busch, Incorporated - St. Louis MO

International Classification:

C07C 6988

US Classification:

560 68

Abstract:

A process for recovering active gallotannin for reuse comprising the extracting of dried schoene sludge (about 5% moisture) with a mixture of about 88 vol. % acetone--12 vol. % water to solubilize the gallotannins. The solvent is evaporated off, the residue is treated with water to solublize the gallotannins. After filtration, the clarified water solution is extracted with ethyl acetate. Evaporation of ethyl acetate leaves purified gallotannin which can be redissolved in water and spray dried to produce reusable powder. A preliminary step of separating yeast from the gallotannin protein complex involves treating with 60% acetone/40% H. sub. 2 O at room temperature before making the solution about 88:12 acetone:water.