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A simple and practical pulp kappa test method for process control in pulp production

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image of Process Control and Quality

Through permanganate measurements, this study demonstrates a simple, rapid, practical, and direct spectrophotometric pulp kappa test method through one calibration with a standard pulp sample of known kappa number. Two permanganate absorption measurements were made in both the testing and standard pulp-permanganate reacting solutions for kappa calculation, one at the beginning of the reaction and the other at about 2-3 min into the reaction. The measured kappa numbers of 13 blended hardwood pulps and another 45 pulps from laboratory pulping of 10 hardwood and softwood species in a kappa number range of 10-70 are reported. The results showed excellent agreement with those obtained by the standard TAPPI kappa method. The effect of the pulp-permanganate reaction temperature on measured kappa number using the present method is also presented. The method has the potential for on-line kappa monitoring in pulp production.


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