Analytical Instrumentation & Environmental Monitoring


LiquiSonic analysers in pulp and paper

October 2019 Analytical Instrumentation & Environmental Monitoring

One of the important steps in the pulp and paper industry is the alkaline sulphate process, where lignin is separated from the fibrous material: due to economic and environmental reasons, the chemicals used in this process need to be recycled.

In the recycling process the black liquor will be concentrated and burned to remove organic materials like lignin. In addition to energy, this recovery process generates a smelt with high salt content, the base material for green liquor. Through causticising with lime, the sodium carbonate in green liquor is converted to sodium hydroxide and reused in white liquor for the next pulping process.

By using LiquiSonic analysers, each process step can be inline monitored and set in an optimal way. The system provides an optimised quality control and productivity increase, especially through fast process monitoring while liquor recycling.

• The analyser finds many applications in the pulp and paper industry:

• Real-time concentration monitoring of all liquor.

• Phase detection and separation in different process steps.

• Black liquor evaporation monitoring.

• Incoming goods control.

• Recycled white liquor control.

Advantages of LiquiSonic technology

• Robust and maintenance-free even for hot (up to 200°C) and high coating liquors.

• Layer-free, no steam wash system necessary.

• No frequent mounting and dismounting for maintenance and cleaning.

• Reduced laboratory costs.

• Highly accurate inline concentration measurement of green, black and white liquor (up to 0,1 wt%).

• Ideal lime dosage in causticising.

• Enhancement of operational safety.




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