MATHEMATICAL-MODEL FOR ACID SULFITE PULPING PROCESS

The mathematical model for acid sulphite pulping process is represented by a linear logarithmic straight line dependence of the main characteristics of pulping, i.e. yield and lignin content in pulp versus time and temperature parameters, both determined by the H-factor. The logarithmic plot of the ratio and product of the mentioned characteristics and parameters of pulping is linear for the content of lignin in pulp lower than 15 % and the value of H-factor higher than 100. The most suitable way for the calculation of the main characteristics of pulping is using a power form of the logarithmic straight line dependence of the ratio yield/lignin vs. lignin content, yield/H-factor vs. H-factor, lignin/H-factor vs. H-factor and their mathematical equivalents, i.e. reciprocal ratios and/or products. Individual constants of the model for sulphite pulping of spruce wood expressed by means of a logarithmic straight line equation for dependence studied, are summarized in Tables.