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Dilute acid/metal salt hydrolysis of lignocellulosics
Published online: Apr 27, 2009
| Geographical region | Europe |
|---|---|
| Subject | Lignocellulosic hydrolysis |
| Issue date | Apr 1, 2009 |
| Title | Dilute acid/metal salt hydrolysis of lignocellulosics |
| Patent Number | EP1307576 B1 |
| Patent Application Number | EP1307576 A1 |
| Assignee | Midwest Research Inst, USA |
| Relevance | A method for hydrolyzing lignocellulosic material under conditions to obtain higher fermentable sugars involving dilute acid hydrolysis process. |
| Type of claims | Grant |
| Overview | This patent discloses a process for converting lignocellulosic biomass such as softwood, hardwood into fermentable sugars by acid impregnated biomass particles. The advantage of the process includes reduction in the cost of steam and equipment, limits the degradation of desirable sugars and formation of toxic byproducts due to kinetic constraints and provides complete hydrolysis of the lignocellulosic substrate. The process comprises, A) impregnating a lignocellulosic feedstock with a mixture of an amount of aqueous solution of a dilute acid catalyst and a metallic salt catalyst sufficient to hydrolyze hemicellulose and cellulose fractions to provide higher overall fermentable sugar yields than is obtainable hydrolyzing with dilute acid alone, B) loading the impregnated lignocellulosic feedstock into a reactor and heating at a temperature of between 120°C to 240°C for 1 to 30 minutes and cooling the impregnated lignocellulosic feedstock and mixture of aqueous solution of dilute acid catalyst (H2SO4, HCl, etc) and metallic salt catalyst (ferrous sulfate, aluminium sulfate, etc) to less than 105°C and C) recovering the water soluble sugars. |
| Related patent documents |
US Patent publications
US4529699 - Process and installation for obtaining ethanol by the continuous acid hydrolysis of cellulosic materials (1985)
Not Listed |
| Patent Document | Full Patent Document [external link] |
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