Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Collections
Journal articles
Magazine articles
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
Setpoint: Marking a Milestone, Paper360°January/February 2015 -15JANPA06
SetPoint: Marking a Milestone, Paper360º January/February 2015
Journal articles
Readers Respond: SEPTEMBER/OCTOBER 2014 , Paper360°January/February 2015 -15JANPA08
Readers Respond, Paper360º January/February 2015
Journal articles
A U.S. Biorefinery Industry Is Emerging, Paper360° January/February 2015 - 15JANPA18
A U.S. Biorefinery Industry Is Emerging, Paper360º January/February 2015
Journal articles
TAPPI Journal Summaries for October 2014 issue, Paper360° January/February 2015 - 15JANPA26
TAPPI JOURNAL Summaries, Paper360º January/February 2015
Journal articles
ADVANCED MANUFACTURING: Mapping Our Future, Paper360° January/February 2015 - 15JANPA30
Mapping Our Future, Paper360º January/February 2015
Journal articles
ASPI NEWS, Paper360° January/February 2015 - 15JANPA37
ASPI News, Paper360º January/February 2015
Journal articles
Understanding coating strength at the molecular and microscopic level, TAPPI JOURNAL June 2015
Understanding coating strength at the molecular and microscopic level, TAPPI JOURNAL June 2015
Journal articles
TAPPI Centennial: A Celebration 100 Years in the Making, Paper360° March/April 2015 -15MARPA14
TAPPI Centennial: A Celebration 100 Years in the Making, Paper360º March/April 2015
Journal articles
Precision Alignment of Winders, Paper360° March/April 2015 -15MARPA28
Precision Alignment of Winders, Paper360º March/April 2015