Paper360 - November/December 2015 - (Page 24)

techlink | KAPPA NUMBER An Automated Solution to the kappa Number test by titration A PAPER 360° STAFF REPORT The delignification of woodchips during the krafting process in a pulp mill is the main quality parameter for the pulp. Kappa number is the variable that represents how much of the lignin, which is the binding element in the cellulose fibers, has been removed or degraded. The higher the Kappa number, the higher the bleaching chemicals cost. A low Kappa number means damaging the cellulose fibers, which affects pulp yield and strength. Because of its importance the Kappa number must be routinely monitored. There are different ways of testing for Kappa number. Many pulp mills have online analyzers that must be verified or "spot checked" for performance. In order to perform this verification, the TAPPI T236 method for determining Kappa number is commonly used. For some pulp mills, the titration is the only available mechanism for measuring the Kappa number. The TAPPI T236 method is lengthy and sensitive to variations in analytical technique. There are critical steps in the procedure, such as temperature measurement after a specific amount of time, reagent additions at a rapid rate, and other steps that if not executed properly could yield an inaccurate result. The method itself is validated and has been proven. However, it is up to each operator to properly execute the method. This can be challenging considering the many responsibilities each operator has on a daily basis. One way to improve the accuracy for a titration method and improve precision and consistency is to automate the process. The VpCI®-355 EcoCoat Water Barrier Coating for Paper or Linerboard Recyclable and 100% Repulpable 3431 Hogarth Street Eau Claire, WI 54703 Phone: (800) 4-CORTEC Fax: (715) 858-0360 Email: 24 Paper360º 673093_Cortec.indd 1 NOVEMBER/DECEMBER 2015 15/05/14 9:31 AM Kappa setup. difficulty with the Kappa number test is that there are many steps in the procedure before titration occurs. A Multi-Tasking Titration System, or Multi_T, has proven to be successful in accomplishing this task. The Multi_T is a PC-controlled titration system that allows for simultaneous tasks to be performed. It consists of a passive interface that houses electrode inputs connected to digital burettes which perform the reagent addition. The brain of the system is software on a PC which is what allows for the Kappa number test to be executed according to the TAPPI method. Reagent additions, temperature measurements, wait times, titration parameters and calculations are programmed into the software. Simply push the start button and the procedure is automated from start to finish. Multi_T runs through the entire process without operator intervention, thus eliminating the variability in results seen from operator to operator. Worker safety is also improved because there is no longer a need to frequently handle reagents. The Multi_T can also be used for the ABC, Black Liquor and Chlorate Residual test methods. Multi_T systems have been successfully integrated into several pulp and paper companies. References are available upon request. For more information contact Lab Synergy at:

Table of Contents for the Digital Edition of Paper360 - November/December 2015

Over the Wire
Proud to be a Papermaker
Solenis’ Total Mill Perspective Helps Mills Stay Competitive
Maintaining Knife Gate Valves
An Automated Solution to the Kappa Number Test by Titration
Higher Alloyed Composite Tubes Make Recovery Boilers Safer and More Efficient
TAPPI Journal Summaries
New Leadership Model Focuses on Caring, Compassion
Consolidation Watch
Association News
Online Exclusives
Index of Advertisers

Paper360 - November/December 2015