Apparatus for controlling the degree of causticization in the preparation of white liquor from the chemicals recovered from black liquor
US4311666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1980 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Feb 11, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium carbonate concentration of green liquor fed to the causticization; determining the sodium carbonate concentration of white liquor resulting from the causticization; and controlling the degree of causticization within a predetermined range while taking both sodium carbonate concentrations into account, so as to maintain the degree of causticization of the white liquor within the range despite variations in sodium carbonate concentration of the green liquor and variations in calcium oxide content of the calcium oxide added for causticization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.