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Introduction to Kraft Pulping and Bleaching Course
This introductory to intermediate-level course will help you expand your overall understanding of kraft pulp mill operations and broaden your awareness of how one part of the process affects other operations. With this knowledge, you'll be better equipped to troubleshoot quality problems and feel more confident in your interactions among process engineers and operators.
Webinars
Events
Towards Better Understanding of Void Volume in Press Nips Webinar
Papermaking Technology Operations Committee Webinar
TAPPI News
There is No Place Like Home
There is No Place Like Home Do you know where Sumter, South Carolina is located? Eric Fletty and I didn’t either. The genesis of our adventure began nearly three years ago from a conversation with
TAPPI News
Old Home Week
Old Home Week Above are 15 of the 21 in attendance who were not camera shy. It never ceases to amaze me, when TAPPI Members come together for a corporate visit or TAPPI conference with 100-5,000
TAPPI News
Paper Shows up in the Strangest Places—Who Says Our Industry Is Not Creative?
Paper Shows up in the Strangest Places—Who Says Our Industry Is Not Creative? What's in your hometown? I have adopted nine cities in my career in this industry, but my hometown was and remains to be
News
APPI plants trees to commemorate its 100th anniversary
To help celebrate its 100th anniversary in 2015, TAPPI, along with RockTenn, Valmet, TREES Atlanta, and members of the Dekalb County community, planted 100 trees in Decatur, Georgia.
News
TAPPI's southeast Ambassador's program identifies knowledge that pulp mills need
Earlier this year, TAPPI members and staff visited several pulp mills in the southeastern U.S., as part of the TAPPI Ambassador program.
News
Engineered Softwood Could Transform Pulp, Paper, Biofuel Industries
April 20, 2015. Scientists today demonstrated the potential for softwoods to process more easily into pulp and paper if engineered to incorporate a key feature of hardwoods.
Journal articles
Effects of calcium on sodium salt scaling with the presence of resin acids and fatty acids, TAPPI Journal June 2026
ABSTRACT: Reintroducing tall oil soap or its related products into high dry solids black liquor has been found to reduce sodium salt scaling in falling film evaporators. Aside from resin acids and fatty acids, which are the likely scale inhibitors, calcium is reintroduced into black liquor because of the relatively high calcium content of tall oil soap. One concern is that this increase in calcium content might lead to the formation of additional calcium and sodium scales in evaporators. In this work, we investigated the relationship among trace amounts of calcium, sodium salts, resin acids, and fatty acids in a controlled system using a model salt solution and a benchtop setup. We studied the effects of the calcium carbonate addition and calcium carbonate scales on sodium salt scaling in the presence of resin acids and fatty acids. We found that some calcium carbonate is incorporated in the precipitated sodium crystals, and the suspended sodium crystals become larger and more compact with increasing calcium carbonate concentration. Experiments in the benchtop setup show that precipitating calcium carbonate scale on the heat exchanger does not lead to a higher rate of sodium salt scaling. The solubility of calcium carbonate is not affected by the addition of resin acids and fatty acids. These findings indicate that the reduction in sodium salt scaling through the addition of tall oil soap is primarily related to resin acids and fatty acids, rather than to calcium or to interactions between calcium and mixtures of resin and fatty acids.