Process for production of extra low color cane sugar
US6174378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Aug 19, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC13B20/165
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
A process for purifying cane sugar from an aqueous composition thereof comprises the steps of (a) contacting an aqueous cane sugar feed composition with sufficient lime to increase the pH of the composition to at least about 9.5; (b) filtering the composition through a membrane having a pore size no greater than about 0.5 microns and having a molecular weight cutoff no less than about 5 kD, thereby producing a retentate and a permeate; and (c) contacting the permeate with sufficient carbon dioxide, or other materials designed to precipitate calcium and lower the pH, to adjust the pH to about 6.5-9.0. The feed composition preferably is cane juice, cane syrup, an aqueous composition of raw sugar, a cane sugar refinery stream, or a mixture of one or more such materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.