A LINEAR LOGARITHMIC RELATIONSHIP OF YIELD VS KAPPA-NUMBER AND YIELD VS LIGNIN CONTENT FOR SULFITE, KRAFT AND SODA PULPS

The relationship between yield and kappa number and/or lignin content of pulps prepared by acid Mg-sulphite, acid Ca-sulphite, magnefite, kr aft and soda pulping of Norway spruce and beech woods was studied. The relation of the yield on kappa number or lignin content can be expres sed by logarithmic straight-line equations or power equations. A set o f power equations characterizing the relationship yield vs. kappa numb er and/or lignin content in pulp prepared by the studied delignificati on procedures is given. A method of mathematical and graphical lineari zation used for deriving the relationship yield vs. kappa number and/o r lignin content is suitable for the evaluation of a set of significan tly scattered experimental data.