D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
9/36.6
D21H 21/48 (2006.01) B41M 5/00 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1282210
TITLE OF THE INVENTION A process for recovering sodium hydroxide from an alkaline pulp waste liquor ABSTRACT OF THE DISCLOSURE Sodium hydroxide is recovered from an alkaline waste liquor containing substantially no sulfur compounds discharged from a process comprising soda cooking wood fibers, washing and optionally bleaching, by the direct causticization pro- cess capable of functioning as a system. This process com- prises: a step (a) of adding a carbon dioxide-containing gas to the black liquor as it is or after concentrated to adjust the pH of the black liquor to 9.5 to 12.5 (at a solid con- centration of black liquor 40 %, 80 °C), a step (b) of concentrating the above described black liquor to a solid concentration of 50 to 95 %, a step (c) of adding the above described carbon dioxide-treated and concentrated black liquor, oxygen and iron oxide to a combustion furnace, subjecting the mixture to combustion and thus burning organic substances and convert- ing inorganic soda components into sodium carbonate and sodium carbonate into sodium ferrite, and a step (d) of hydrolyzing the thus resulting pro- duct to recover sodium hydroxide and recycling the recovered iron oxide to the above described step (c).
520222
Hasegawa Keiji
Ito Hayami
Iwahashi Kouji
Kikuoka Kazuma
Machida Osamu
New Oji Paper Company Limited
Riches Mckenzie & Herbert Llp
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