Washing of soda pulp cooked from rapeseed straw

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F16%3A39901673" target="_blank" >RIV/00216275:25310/16:39901673 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.17423/afx.2016.58.1.04" target="_blank" >http://dx.doi.org/10.17423/afx.2016.58.1.04</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17423/afx.2016.58.1.04" target="_blank" >10.17423/afx.2016.58.1.04</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Washing of soda pulp cooked from rapeseed straw

Popis výsledku v původním jazyce

The aim of this work was to investigate the displacement washing process of soda pulp cooked from rapeseed straw from the point of view of chemical-engineering analysis. 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 the dimensionless number known as the Péclet number characterizing the displacement of 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, 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.

Název v anglickém jazyce

Washing of soda pulp cooked from rapeseed straw

Popis výsledku anglicky

The aim of this work was to investigate the displacement washing process of soda pulp cooked from rapeseed straw from the point of view of chemical-engineering analysis. 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 the dimensionless number known as the Péclet number characterizing the displacement of 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, 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JJ - Ostatní materiály

OECD FORD obor

—

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Facultatis Xylologiae Zvolen

ISSN

1336-3824

e-ISSN

—

Svazek periodika

58

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

7

Strana od-do

35-41

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-84959933643