A NEW APPROACH TO MEASURINGPULP YIELDS IN A CONTINUOUSCOOKING SYSTEM, 2002 Kraft Pulp Yield Anthology

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We tried to establish the method to measure kraft-pulp yields. using the total organic carbon (TOC) values of black liquors. Lignin and carbohydrates in black liquors were separated by acidification. Then TOCs of black liquors(named as BL) and supernatant of acidified black liquors (named as ABL) were measured. A TOC ratio of ABL/BL (named as R) was suitable for a parameter of a, yield determination, because it was not influenced by avariation of liquor volumes. However the obtained relations between Rs and pulp yields in the laboratory experiments were different between the cooking methods. Because the ratios of a precipitated lignin, which meant the ratio of the precipitated lignin to the total lignin of black liquors, depended upon the cooking methods. One line arrelation between the corrected Rs (R’s) and pulp yields was given by considering the ratios of the precipitated lignin. We tried to predict the pulp yields in the continuous cooking system of the mill with this method. It could be shown that MCC operation and the addition of anthraquinone were effective for the increase of pulp yields.