Inventors:
Timothy G. Bradley - Denver CO
Raymond L. McAdam - Littleton CO
Assignee:
Johns-Manville Corporation - Denver CO
International Classification:
C12H 100, A23L 230
Abstract:
A low beverage soluble iron content filter aid, especially diatomite, is disclosed, as is the method for its production, which comprises contacting the granular filter aid with tannic acid, gallic acid, or mixtures thereof, preferable in aqueous solution. Color control agents such as citric acid may also be present in the solution. The treated filter diatomite is useful in the filtration of vegetable based beverages, especially beer, wine, ale and fruit juices. The invention is also applicable to other filter aids which contain beverage soluble iron, such as perlite.