Process for increasing the solids content of black liquor at its recovery in a sulfate pulping process
US4857146A · kind A · utility
4Cited by
1References
12Claims
0Family size
Inventor
Key dates
| Filing date | Jun 6, 1986 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Jun 6, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/03
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a process of increasing the solids content of black liquor at its recovery in a sulfate pulping process. According to the invention, the liquor is first heated at a pressure which is so high that no boiling occurs at the heating temperature, after which the liquor is led to a tank where its pressure is released to a value below the saturation pressure of steam at the relative temperature of the liquor such that water is evaporated. The liquor thus concentrated can be led to the liquor combustion in the recovery process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.