ABC Titration: Analysis of alkali, carbonate, hydroxide, and sulfide in pulping liquors

Význam tématu

Monitoring of key chemical species in Kraft pulping liquors ensures efficient recovery of cooking chemicals and stability of downstream processes.

Cíle a přehled studie / článku

This application note describes the implementation of the Metrohm 2060 Process Analyzer for continuous online determination of active alkali (AA), effective alkali (EA), total titratable alkali (TTA), carbonate, hydroxide and sulfide in white, green and black liquors to support closed-loop process control in pulp production.

Použitá metodika a instrumentace

• ABC titration method conforming to SCAN-N 30:85 for simultaneous quantification of alkali, carbonate, hydroxide and sulfide.
• Thermometric titration module for online sulfate monitoring.
• 2060 Process Analyzer platform featuring a modular wet part, expandable reagent cabinets and integrated industrial PC.
• Sample preconditioning systems including cooling/heating, pressure reduction, degassing and filtration to handle hot and corrosive streams.

Hlavní výsledky a diskuse

• Reliable measurement ranges: 0.1–3 mol/L CO₃²⁻ and S²⁻; 0.1–6 mol/L OH⁻; 0.1–8 mol/L total alkali.
• Continuous online data provides rapid feedback, enabling tighter control of the causticizing and recovery loops.
• Thermometric titration accelerates analysis time and removes the need for toxic reagents.

Přínosy a praktické využití metody

• Enhanced causticizing efficiency and chemical recovery yield.
• Reduced variability in total and effective alkali measurements.
• Automated sampling and analysis improve operator safety and lower spill risk.
• Faster return on investment through minimized downtime and optimized reagent consumption.

Budoucí trendy a možnosti využití

Integration of advanced data analytics, AI-driven predictive control, IoT connectivity and expanded analyte panels will further optimize pulping operations and resource efficiency.

Závěr

The Metrohm 2060 Process Analyzer delivers a robust, scalable solution for real-time monitoring of critical chemical parameters in Kraft pulping, driving improved efficiency, safety and sustainability in paper manufacturing.

Reference

• Application Note AN-PAN-1004 ABC Titration: Analysis of alkali, carbonate, hydroxide and sulfide in pulping liquors.
• Standard method SCAN-N 30:85 of the pulp and paper industry.