METHOD FOR RAPID DETERMINATION OF THE CONTENTS OF LIGNIN, MONOSACCHARIDES AND ORGANIC ACIDS IN THE PROCESS SOLUTIONS OF SULFITE PULPING

摘要

Abstract of the DisclosureThe invention relates to a method for rapid determina-tion of the contents of lignin, monosaccharides andorganic acids in the process solutions of sulfite pulping.According to the invention, any non-ionized compoundsthat disturb measurements of concentrations are separatedfrom the lignin material by fractioning by means of theion-exclusion technique. The measurements of concentra-tions are carried out by means of the UV-method,refractive-index method, and/or by means of the polari-metric method. The method in accordance with the inven-tion is usable for the controlling of sulfite cookingor other pulping or by-product production prosesses aswell as for the characterization of the spent liquor.