Process for the recovery of heat and chemicals from spent liquor
US5230773A · kind A · utility
3Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 31, 1990 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Aug 31, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S159/34
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a process for the recovery of heat and chemicals from a mixture of ashes and spent liquor by carrying out the final concentrating (2) of the liquor, and its feeding (8) into the soda recovery unit (5), under pressure and at a temperature higher than the atmospheric boiling point of the liquor. According to the invention, the ashes (1) are not mixed with the waste liquor (7) until after the final concentrating (2) of the liquor, and the mixture is further expansion evaporated (4) before the thus concentrated pressurized liquor is fed into the soda recovery unit (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.