Measurement by Raman spectroscopy of Kappa number of chemical pulp

摘要

(57) a rapid method for online expression spectroscopic measurement of Kappa number and / or lignin content in the [summary] wood pulp is provided. Unlike the commercial measurement methods that are currently available, this method makes it possible to measure lignin content independently of the pulp concentration and species variations. Subjected to a monochromatic visible light source to the sample (2) are; Remove the high concentration sample of wood pulp from the manufacturing process of (1) chemical pulp This method, scattered light obtained as a (3) Results and the Raman spectrum, recorded over the wave number range which is determined in advance to provide a scattered light intensity measurements - Raman; uncorrected (4) the sample -, baseline correction - one of the scattered light intensity, - the Raman - integral and / or determined over the wave number range of lignin content, cellulose content and a defined pre combinations of different concentrations indicated; Raman (5) an unknown sample - the scattered light intensity measurements, lignin content, cellulose content and a known concentration Kappa number and / or lignin content of the wood pulp is 5-110, preferably about 5 to 20 pulp concentration level sample or cellulose content of any level, the relationship between the scattered light intensity - a combination of Raman indicated As can be accurately measured over a range of Kappa number, the step of correlating in either multivariate calibration or univariate calibration.