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Evaluation of soap recovery efficiency from black liquor — analytical tools, TAPPI Journal April 2023
ABSTRACT: Soap skimmings (“soap”) are typically recovered from black liquor in kraft mills that process a high percentage of softwood. In many mills, the recovery of soap is inefficient, negatively impacting performance of evaporators and recovery boilers and resulting in loss of potential revenue. A thorough evaluation of soap recovery performance in a kraft mill requires measurement of soap content in black liquor at various sampling locations, especially around the soap skimmer.The standard laboratory method for evaluating soap content in black liquor is a complex, multi-step process that relies on solvent extraction and titration; most mills send these samples to an outside laboratory for this analysis. In this study, 100 black liquor samples, with a wide range of soap concentrations, were tested by the standard solvent extraction method. After additional dilution, each sample was also tested for surface tension with a bubble pressure tensiometer. The results were found to correlate very closely with the solvent extraction tests results. This alternate method, using surface tension measurements of diluted black liquor samples, produces rapid results and can be easily implemented in most kraft mills, which would facilitate much more frequent in-house evaluations of soap recovery performance.
Journal articles
Characterization of refined papermaking pulps using hydrodynamic parameters from filtration analysis, TAPPI JOURNAL May 2015
Characterization of refined papermaking pulps using hydrodynamic parameters from filtration analysis, TAPPI JOURNAL May 2015
Journal articles
Setting the record straight, TAPPI JOURNAL, July 1998, Vol. 81(7)
Setting the record straight, TAPPI JOURNAL, July 1998, Vol. 81(7)
Journal articles
New opportunities in the South American pulp and paper business, TAPPI JOURNAL, June 1998, Vol. 81(6)
New opportunities in the south american pulp and paper business, TAPPI JOURNAL, June 1998, Vol. 81(6)
Journal articles
Design guidelines for continuous emissions monitors and predictive emissions monitors, TAPPI JOURNAL, March 1998, Vol. 81(3)
Design guidelines for continuous emissions monitors and predictive emissions monitors, TAPPI JOURNAL, March 1998, Vol. 81(3)
Journal articles
Improving industrial powerhouse operations with an energy management system, TAPPI JOURNAL, March 1998, Vol. 81(3)
Improving industrial powerhouse operations with an energy management system, TAPPI JOURNAL, March 1998, Vol. 81(3)
Journal articles
Synthetic lubricant use in pulp and paper mills, TAPPI JOURNAL, November 1998, Vol. 81(11)
Synthetic lubricant use in pulp and paper mills, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)
Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)
Journal articles
Environmental progress at Howe Sound Pulp & Paper, TAPPI JOURNAL, September 1998, Vol. 81(9)
Environmental progress at howe sound pulp & paper, TAPPI JOURNAL, September 1998, Vol. 81(9)
Journal articles
Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)
Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)