How On-line Static Optics FTIR Can Replace Titration for Recausticizing Control -
Examples From the Field

ABSTRACT
Titration has long been used as the standard approach for measuring the makeup of green and white liquors, and the
output used to control the recausticizing process. Auto-titrators made this approach significantly less dangerous and
time-consuming, but they are not the perfect solution – with complicated maintenance, “black box” measurements
that don’t give confidence limits or other metrics, and the need to wait between measurements.
This work presents the use of a static optics FTIR spectrometer used specifically to measure and then control
recausticizing processes. It briefly explains the principles of static optics FTIR before delving in to case studies. Then
presents a case study of calibrating an instrument for use in a green liquor line designed to feed forward and control
the lime addition, including the challenges and setbacks experienced in commissioning the installation. Lastly the
initial results of a white liquor installation in a carbonate mill designed for feedback measurements are presented. 

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