Two stage continuous hydrolysis of plant biomass to sugars
US4427453A · kind A · utility
Inventor
Key dates
| Filing date | Oct 15, 1981 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Oct 15, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC13K1/02
- WIPO fieldFood chemistry
- WIPO sectorChemistry
Abstract
Process and apparatus for the continuous hydrolysis of plant biomass containing cellulose and hemicellulose. Chopped biomass is treated in a first stage in the presence of dilute acid, at temperatures and pressure conditions under which the hemicellulose and, partially, the cellulose are hydrolyzed during a first reaction to pentoses and partially, hexoses, whereupon the reaction mixture pressure is suddenly released and the hydrolysate is separated from the biomass, and in at least a further stage, cellulose in the biomass is hydrolyzed in the presence of dilute mineral acid and under more severe temperature and pressure conditions, to hexoses, whereupon again the reaction mixture pressure is suddenly released and the hydrolysate is separated from the remaining biomass, and in which the neutralized hydrolysate, is further processed for the production of sugars, wherein each hydrolysis stage comprises as reaction chamber, a continuously operating horizontal tube digester containing horizontal conveyor devices, the digester being connected on the entrance side with a conical worm filler with a perforated cone casing for the injection of the biomass and the outlet side is fitted with…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.