Partial autocausticization of alkali liquors for wood...

Details Partial autocausticization of alkali liquors for wood... Partial autocausticization of alkali liquors for wood...

D - Textiles, Paper

21

C

D21C 11/04 (2006.01) D21C 3/02 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2273591

A method is provided for the use of borates in the recausticization of alkali- containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from sodium carbonate-containing smelts in such pulp processes by autocausticization through the addition of limited amounts of borate. Autocausticization may be carried out at boron to carbonate molar ratios below 2:1 and at sodium to boron molar ratios exceeding 3:1, resulting in high reaction efficiency. Partial autocausticization using borate may also be combined with conventional lime recausticization for the regeneration of sodium hydroxide from sodium carbonate-containing smelts.

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