Process for recovering energy and chemicals from spent liquor in pulp preparation
US4872950A · kind A · utility
Inventors
Key dates
| Filing date | Nov 17, 1987 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Nov 17, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Eenrgy and process chemicals are recovered from spent liquor in pulp preparation by thermally decomposing the spent liquor to solid and gaseous products at an elevated pressure and with addition of oxygen. The supply of oxygen should be less than that stoichiometrically required for a complete combustion and the temperature at the decomposition should be below the temperature at which a melt is formed. After recovery of sulfur-containing compounds the gas formed can give off energy in a gas turbine, thereafter generate steam and finally be used for drying fuel which is subsequently gasified under pressure and provides a further contribution of energy in the form of a combustible gas. Process chemicals are recovered from the solid products in known manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.