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Displacement washing of soda pulp from rapeseed straw
Authors: Potůček František | Hájková Kateřina
Year: 2015
Type of publication: článek ve sborníku
Name of source: Proceedings 42nd International Conference of SSCHE
Publisher name: Slovenská spoločnosť chemického inžinierstva
Place: Bratislava
Page from-to: 155-163
Titles:
Language Name Abstract Keywords
cze Vytěsňovací praní natronové buničiny ze slámy řepky olejky Cílem práce bylo vyšetřit průběh vytěsňovacího praní natronové buničiny uvařené ze slámy řepky olejky. Matematickým zpracováním pracích vytěsňovacích křivek naměřených pro skokový vstupní signál bylo získáno Pécletovo kritérium, jehož hodnota charakterizuje průběh vytěsnění alkalického ligninu z vrstvy vláken buničiny. K detailnějšímu popisu vytěsňovacího praní byly vyhodnoceny ještě prací výtěžek, koeficient axiální disperze a hydraulický odpor vrstvy vláken. vytěsňovací praní; natronová řepková buničina; výtěžek praní
eng Displacement washing of soda pulp from rapeseed straw The aim of this work was to investigate the displacement washing process of soda pulp cooked from rapeseed straw. The displacement washing process was described by displacement washing curves recorded for alkali lignin like a tracer. The shape of the washing curves obtained experimentally indicated that the displacement of black liquor was non-ideal, i. e., it was between the ideal limits of plug flow and perfectly mixed flow. Mathematical treatment of the washing curves, which were obtained as a response to the step input signal, gave a dimensionless number known as the Péclet number characterizing the displacement of alkali lignin from the pulp pad. For detailed description of displacement washing process, further parameters, such as the traditional wash yield, as well as axial dispersion coefficient, were also evaluated. The preliminary results obtained showed that the differences in intrinsic properties between soda rapeseed and kraft wood fibres have an impact on the displacement washing of soda pulp. Similarly as for kraft softwood and hardwood fibres, the wash yield determined for soda rapeseed pulp was found to be lower than that for non-porous incompressible particles. Comparing our results for soda pulp with those reported for softwood and hardwood pulps earlier, the displacement front becomes irregular owing to the heterogeneity of soda pulp fibre bed having much greater hydraulic resistance. With respect to this fact, the greater scatter of the longitudinal dispersion coefficient was achieved for soda pulp fibres. displacement washing; soda rapeseed pulp; wash yield

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