Method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material
US8052953B2 · kind B2 · utility
14Cited by
5References
12Claims
0Family size
Inventor
Key dates
| Filing date | Jul 29, 2008 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Jul 29, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B17/903
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for recovering sulfuric acid from concentrated acid hydrolysate of plant cellulose material is disclosed. In some of the examples, the concentrated acid hydrolysate is mixed with a liquid organic precipitant, with the sugars in the hydrolysate being precipitated and separated out. The remainder is sulfuric acid and an organic solvent solution. The organic solvent is then separated by distillation or extraction, thereby obtaining the pure sulfuric acid solution. This precipitation method can recover above 90% sugars and acids with a small amount of organic precipitant, which greatly reduces the recovery cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.