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Chemical pulping concepts, recovery and by-products

Chemical pulping is one of the main elements in today’s global restructuring of the forest industry. Growing number of pulp mills are located close to the equator and fast growing new fibre sources. Great expectations are placed upon pulp mills that are being reshaped into biorefineries. Whether your challenge lies in the vast new raw material base, recovering chemicals or utilization of by-products, VTT can help you to find the solution.

Optimization of raw materials and their processing

VTT has long experience in tailoring pulps from various fibre raw materials. We can help you to develop and use optimal pulping processes and conditions (cooking, bleaching) for the desired end-product properties. We can test and demonstrate the new product properties from raw material processing to end-product at laboratory and pilot scale.

Improvement of production efficiency

Quite commonly the goal of a customer solution work is to improve a pulp mill’s production efficiency and product quality. To reach the goal, we can offer e.g. a process audit with optimization and raw material studies. In addition to laboratory tests and pilot trials we conduct practical mill trials to evaluate e.g. the changes in pulp yield and pulp quality during process changes, as well as strength losses (fibre damage) along the fibre line.

The challenge in a pulp mill can be also in managing the process flows in the chemical recovery cycle. VTT offers in-depth knowledge of both chemical and physical characteristics of components and their behaviour, which is vital for controlling and developing the process and equipment. For example, the trend of raising the dry solids of black liquor has made it essential to thoroughly understand the composition of black liquor in order to prevent possible problems such as scaling and to ensure trouble-free operation of the evaporation plant and recovery boiler. Another recent example is the increased attention to the presence and thus the need for removal of non-process elements (NPE) in the chemical recovery process.

New opportunities with biorefineries

In the modern pulping and papermaking operations we see and want to offer fascinating opportunities for the integration of advanced biorefinery processes: isolation of chemicals and materials from different sources for various value-adding applications. For several decades we have successfully studied and developed new isolation and conversion processes, based particularly on the chemical pulping methods and different side-streams. Contact us to find out how we can co-operate for your future success.


Additional information

Terhi Saari
Customer Manager
+358 20 722 2541

Marjo Määttänen
Research Scientist
+358 40 702 9527

Additional information

Terhi Saari
Customer Manager
+358 20 722 2541

Marjo Määttänen
Research Scientist
+358 40 702 9527