Use of tannic or gallic acid to produce low beverage soluble iron content filter aid
US4134857A · kind A · utility
10Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1977 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Feb 7, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/519
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.