Process of removing calcium and obtaining sulfate salts from an aqueous sugar solution
US8273181B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2008 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jun 25, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A40/20
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a process for obtaining a product stream comprising one or more sulfate salts of potassium, sodium or ammonium from a sugar stream resulting from [processing a lignocellulosic feedstock, said sugar stream which includes calcium sulfate and one or more of these sulfate salts. The process comprises (i) treating the sugar stream to remove calcium, thereby producing a sugar stream containing substantially no calcium, and obtaining a salt stream comprising a calcium salt; (ii) choosing a feed stream that is either (a) a clarified salt stream derived from the salt stream of step (i) after removal of calcium therefrom; or (b) the sugar stream containing substantially no calcium that is produced in step (i); (iii) introducing the feed stream chosen in step (ii) to an ion exchange bed; and (iv) regenerating the ion exchange resin bed of step (iii) with sulfuric acid to produce the product stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.