A MATHEMATICAL-MODEL FOR NEUTRAL SULFITE PULPING OF VARIOUS BROADLEAVED WOOD SPECIES

A mathematical model for neutral sulfite pulping process was derived. This model represented by a linear logarithmic relationship of the mai n pulping characteristics (yield and lignin content) to time and tempe rature parameters, both determined by the H-factor, is expressed by a logarithmic straight line equation. The relationship of yield to ligni n content in the high yield pulps after neutral sulfite pulping is als o expressed by a logarithmic straight line equation. A suitable way to calculate the main characteristics of neutral sulfite pulping is the power form of the logarithmic straight line equation for the dependenc e of the ratio yield/lignin vs. lignin content, yield/H-factor vs. H-f actor, lignin/H-factor vs. H-factor and their mathematical equivalents (i.e. reciprocal ratio and/or product). A set of power equations char acterizing the relationships yield vs. lignin content as well as yield and lignin content vs. H-factor for woodpulps prepared by neutral sul fite pulping of various broadleaved wood species are given.