Evaluation of soap recovery efficiency from black liquor - analytical tools

Soap skimmings (“soap”) are typically recovered from black liquor in kraft mills that process a high percentage of softwood. In many mills, the recovery soap is inefficient, negatively impacting performance evaporators and boilers resulting loss potential revenue. A thorough evaluation mill requires measurement content at various sampling locations, especially around skimmer. The standard laboratory method for evaluating complex, multi-step relies on solvent extraction titration; most send these samples to an outside this analysis. study, 100 samples, with wide range concentrations, were tested by method. After additional dilution, each sample was also surface tension bubble pressure tensiometer. results found correlate very closely tests results. This alternate method, using measurements diluted produces rapid can be easily implemented which would facilitate much more frequent in-house evaluations performance.