Process and apparatus for controlling the degree of...

Details Process and apparatus for controlling the degree of... Process and apparatus for controlling the degree of...

D - Textiles, Paper

21

C

9/36, 9/37

D21C 11/04 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1121953

16-234 PROCESS AND APPARATUS FOR CONTROLLING THE DEGREE OF CAUSTICIZATION IN THE PREPARATION OF WHITE LIQUOR FROM THE CHEMICALS RECOVERED FROM BLACK LIQUOR ABSTRACT OF THE DISCLOSURE Process and apparatus are 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; de- termining 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 caustici- zation 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.

330943

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