Digester - Separation of Lignocellulose and Residues on a Pilot Scale

The earth's circular and renewable raw materials are in demand and should be sufficient for a lot. increasing the need for research and development of them so that each element is put to good use. Separation of cellulose from forests, agriculture and the sea is a fundamental part of biorefinery and sustainable production. 

The pilot cooking plant is very flexible with efficient methods and equipment for simulation of all commercial cooking methods. RISE has extensive experience of various digesting systems and is continuously working on improvements in both sulphate and sulphite cooking.

Chip and alkalines  from the mill are used to simulate the existing digester in a laboratory environment under controlled conditions. The digesters can also be used as reactors in biorefinery investigations.

Wood chips of different types and sizes can be cooked at the same time in the same digester under the same processing conditions but still kept separate. The process conditions can be varied with regard to e.g. time, temperature, displacement of cooking liquids, concentrations in cooking liquids and cooking methods. Adding cooking liquids during the cooking process can be made. Batch and continuous cooking can be simulated.

The digester consists of a boiler body and nine accumulators for cooking liquids. It can be loaded with 10 kg of wood chips, which provides a sufficient amount of pulp to proceed with subsequent process steps such as bleaching and making paper, etc.

The digester is ideal for wood examinations and can be used for performance tests.

Wood variations such as wood species is also possible to investigate such as root-top, age (juvenile-mature), chemical composition, dimensions, forest rot, storage rot, dry content, size distribution, impurities, density and brightness.

RISE can also carry out surveys in the field of deforestation, such as wood and wood storage, debarking, chipping, chip storage, chip screening, bark content, wood content in bark fraction, dry-raw density. Studies on wood chips such as lignin content, hemicellulose.

Read more about our pilots. You can also analyse the liquor in all steps, such as organic compounds, metals, sulphite, sulphate and thiosulfate ions and extraktives.

See the film Pilot digester

Pre treatment reactor

Tough steaming can lower tearing resistance

Unique chip impregnation