Research and development of solvolysis pulping. (V). Process engineering for solvolysis pulping.

Process intensification in mechanical pulping

Process intensification is a term used in the chemical process industry for major improvements in the process design leading to radical changes in process complexity, equipment size and efficiency. We suggest that a similar approach is applied in the pulp and paper industry. We have focused on the production of mechanical pulp, but a similar approach can be applied to other areas within the pul...

SOM Based Analysis of Pulping Process Data

Mechanism of Solvolysis of Orthophosphoramidates

The data on the solvolysis of orthophosphoramidates are collected and rationalized into two groups: a mechanism involving a unimolecular decomposition of the compounds where nitrogen contains a positive charge, and a bimolecular one for molecules with uncharged nitrogen involving the entering and leaving groups at right angles to each other. The first mechanism is invoked for all acid catalyzed...

Pulping Catalysts in Trees

Several hardwood and softwood trees were analyzed for anthraquinone-type components. Wood samples were reduced to a small size and extracted with an organic solvent; the extracts were then concentrated and analyzed by gas chromatography-mass spectroscopy. Low levels of AQ and anthrone components were detected using a sensitive selected-ion monitoring technique. Ten out of seventeen hardwood sam...

Wood and Fibre Mechanics Related to the Thermomechanical Pulping Process

The main objective of this thesis was to improve the understanding of some aspects on wood and fibre mechanics related to conditions in the thermomechanical pulping process. Another objective was to measure the power distribution between the rotating plates in a refiner. The thesis comprises the following parts: – A literature review aimed at describing fracture in wood and fibres as related to...