Solid bleaching composition for edible oils
US4443379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1982 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Mar 17, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11B3/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition useful for the adsorptive bleaching of edible oils, particularly of vegetable oils, is disclosed. The composition consists essentially of a major portion of bleaching clay and a minor portion of an alumino-silicate zeolite preferably of the faujasite-type structure. The zeolite used has its base exchange sites occupied by alkaline earth metal and/or transition metal cations, wherein the transition metal cations employed exclude those of the Group VIII metals. Preferably, the zeolite is a calcium-, magnesium-, or lanthanum-exchanged Y-zeolite. The presence of the zeolite in the bleaching composition significantly improves the removal of free fatty acids from the oil while permitting simultaneous removal of color impurities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.