SOLUBILITY OF SODIUM OXALATE IN KRAFT BLACK LIQUORS, 19PEERS

Oxalate is both present in wood and formed during pulping. The amount of oxalate present in wood largely depends on the ground the wood is grown on as oxalate is used by plants and trees to bind excess cations such as calcium. The source of oxalate formation in pulping is unknown, but it has been found to depend on wood species and pulping conditions. Sodium oxalate scaling is most prevalent in mills pulping tropical hardwoods, but it is also found in the scales in high solids lines after the concentrators in mills pulping softwoods.  There is very limited solubility data for sodium oxalate in black liquor. This study measures the solubility limit in different black liquors through a temperature range below 100 oC of black liquor evaporators at different black liquor dry solids and discusses the implications for kraft pulp mills.  

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