Analytical Instrumentation & Environmental Monitoring

Concentration monitoring for pulp and paper

October 2018 Analytical Instrumentation & Environmental Monitoring

In the pulp and paper industry, the alkaline sulphate process, which is where fibrous material is separated from lignin, is important. These chemicals need to be recycled, due to environmental and economic reasons, so it is vital that this process runs smoothly.

To get it wrong can cause complications and cost time and money.

SensoTech’s LiquiSonic analysers monitor the process

What actually happens?

Lignin, an organic material, and others like it, are removed through a process that concentrates and burns the black liquor. What is produced through this recovery process is a smelt with high salt content as well as energy, providing the base material for green liquor. The sodium carbonate in green liquor, through the causticising with lime, is converted to sodium hydroxide, which is reused in white liquor for the next pulping process.

The LiquiSonic analysers monitor each step inline, in an optimal manner, which leads to productivity increases as well as optimised quality control.

What are the applications?

• Green liquor concentration is monitored in real-time.

• In different processes, phase detection and separation occurs.

• Black liquor evaporation monitoring.

• Control of incoming goods.

• Control of recycled white liquor.

What are the advantages?

• Steam washing is not necessary as it is layer free.

• Laboratory costs are reduced.

• In causticising, there is ideal dosage of lime.

• Maintenance free processes even with high temperatures (200°C) and liquors with high coating.

• No dismounting and remounting required for cleaning or maintenance.

• Accurate inline concentration measurement for black, white and green liquor.

• Enhanced operational safety.

For the high demands that are placed on sensor technology in the pulp and paper industry, SensoTech sensors have been built to withstand the harsh working environment and can be adapted to existing process conditions.

For more information contact Morton Controls, +27 86 100 0393,,


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Suspended solids sensor
April 2020, Morton Controls , Sensors & Transducers
Morton Controls, in partnership with Quadbeam, has introduced the Stormwater and Wastewater sensor, the SWW, the newest suspended solids sensor/turbidity meter available. Quadbeam has created an incredibly ...

Carbon dioxide monitoring
April 2020 , Analytical Instrumentation & Environmental Monitoring
Monitoring devices able to detect high levels of carbon dioxide have been introduced to the local market to help detect poor air quality that can lead to sick building syndrome. Distributed and supported ...

Process monitoring in laboratories – the smart analyser
April 2020 , Analytical Instrumentation & Environmental Monitoring
LiquiSonic Lab is specifically designed for laboratory applications and as a portable system in process plants. It is provided with a splash water-proof housing, hence is also suited for rough operating ...

Robots in the time of Covid-19
April 2020 , Analytical Instrumentation & Environmental Monitoring
The contagion of Covid-19 has swept through the lives of people across the globe, disrupted industries and had a dramatic impact on the world’s economy. Some analysts predict the pandemic’s impact could ...

Turbidity sensor with IO-Link
March 2020, Morton Controls , Sensors & Transducers
Digitisation has branched into industry under the keyword Industry 4.0. IO-Link offers significant advantages when it comes to reliably controlling the entire system technology in process control with ...

CIP design, planning and installation
February 2020, Morton Controls , System Integration & Control Systems Design
A complete system for a company specialising in the transport of liquid food.

Hygienic limit switches for processes
February 2020, Morton Controls , Maintenance, Test & Measurement, Calibration
Process and storage vessels incorporate limit switches to prevent overfilling of a tank or vessel (full indicator) or dry running of a pump (empty indicator). Anderson-Negele’s NCS series are ideally ...

High-speed level measurement
February 2020, Morton Controls , Level Measurement & Control
Morton Controls in partnership with Anderson-Negele has introduced the innovative NSL-F level sensor based on a modular device platform. The new platform strategy used with this sensor is based on a building-block ...

Capacitive level limit switch
February 2020, Morton Controls , Level Measurement & Control
The Capanivo level limit switch can be used in most solids and liquids as a full or empty detector. The robust, glass reinforced PPS (polyphenylene sulphide) sensor is suitable for food applications while ...

Rotary paddle switch with rope extension for point level measurement in silos
February 2020, Morton Controls , Level Measurement & Control
Limit detection is required in most silos and containers to avoid overfilling or unnecessary downtime. The sensor needs to deal with an assortment of process conditions within a wide range of industries. ...