Abstract
This study demonstrated online monitoring of hydroxide, or effective alkali (EA), sulfide, and dissolved lignin in kraft wood pulping processes using flow injection analysis (FIA) and attenuated total reflection (ATR)-ultraviolet (UV) spectroscopy. The FIA technique was found to be effective in the resolution of ATR probe fouling in alkaline pulping liquors. Good spectral repeatability with a maximum relative standard deviation of the spectral intensity of less than 15% was obtained over a period of 5 days. Successful online monitoring of EA, sulfide, and dissolved lignin during laboratory pulping processes was demonstrated. The species concentrations measured by the ATR-UV sensor were found to be in excellent agreement with those obtained by traditional titration and conventional UV absorption measurements.
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