Aqueous fractionation of biomass based on novel carbohydrate hydrolysis kinetics
US6228177A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Apr 14, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/04
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
A multi-function process for hydrolysis and fractionation of lignocellulosic biomass to separate hemicellulosic sugars from other biomass components comprising extractives and proteins; a portion of a solubilized lignin; cellulose; glucose derived from cellulose; and insoluble lignin from said biomass comprising: PA1 a) introducing either solid fresh biomass or partially fractioned lignocellulosic biomass material with entrained acid or water into a reactor and heating to a temperature of up to about 185.degree. C.-205.degree. C. PA1 b) allowing the reaction to proceed to a point where about 60% of the hemicellulose has been hydrolyzed in the case of water or complete dissolution in case of acid; PA1 c) adding a dilute acid liquid at a pH below about 5 at a temperature of up to about 205.degree. C. for a period ranging from about 5 to about 10 minutes; to hydrolyze the remaining 40% of hemicellulose if water is used. PA1 d) quenching the reaction at a temperature of up to about 140.degree. C. to quench all degradation and hydrolysis reactions; and PA1 e) introducing into said reaction chamber and simultaneously removing from said reaction chamber, a volumetric flow rate of dilute a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.