Methods to determine the number cover or lignin content of the pulp, and to analyze the lignin content of the pulp, and automated procedure for the determination of line number cover

摘要

Methods to determine the number cover or lignin content of the pulp, and to analyze the lignin content of the pulp, and automated procedure for the determination of number line cover ".This invention describes a new method to measure number cover or lignin content of the pulp from Kraft based on measuring voltamu00e9trica catalytic reactions involving lignin and redox mediators.This method comprises measuring the rate of regeneration of a catalyst of oxidation-reduction of lignin in the presence of pulp, followed by its oxidation at an electrode voltamu00e9trico.The intensity of the current generated on the surface of the electrode catalysed is shown to be proportional to the amount of lignin present in the pulp.In the types of pulp (soft wood, hard wood or deslignificada by oxygen), linear relationships can be obtained between the intensities of the current generated and a range of numbers cover.The characteristics of redox and the concentration of the mediator, and the rate of scanning voltage of the procedure voltamu00e9trico,They are among the parameters that can be tuned to the linear relation obtained with number cover of various pulps.Automation of this method may lead to the development of a new analyzer electro cover on the line to be used for process control of pulping or bleaching.