Bed Efficiency and Volumetric Mass Transfer Coefficient as Mass Transport Parameters of Displacement Pulp Washing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F19%3A39914662" target="_blank" >RIV/00216275:25310/19:39914662 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.cellulosechemtechnol.ro/pdf/CCT9-10(2019)/p.929-938.pdf" target="_blank" >http://www.cellulosechemtechnol.ro/pdf/CCT9-10(2019)/p.929-938.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Bed Efficiency and Volumetric Mass Transfer Coefficient as Mass Transport Parameters of Displacement Pulp Washing

Popis výsledku v původním jazyce

The long-fibred spruce sulphite and kraft pulps, as well as short-fibred soda pulp cooked from rapeseed straw were subjected to displacement washing under laboratory conditions. Pure water was used as wash liquid, the conductivity of which was described by the permeability. The unmovable pulp bed was characterised by its average effective flow porosity, specific resistance, and equivalent pore diameter. The displacement washing process was divided into two periods. The first period, when spent liquor was displaced from the inter-fibre pores, was described by bed efficiency. The transport of solute in the second period, when leaching prevails, was characterised by the volumetric mass transfer coefficient. The results obtained showed that the bed efficiency increases with increasing Péclet number, however, it decreases with increasing dimensionless dispersion length. The bed efficiency obtained for long-fibred spruce pulps was found to be greater compared to that for short-fibred soda rapeseed pulp. The average volumetric mass transfer coefficient determined for all pulp types had an increasing trend with increasing superficial wash water velocity.

Název v anglickém jazyce

Bed Efficiency and Volumetric Mass Transfer Coefficient as Mass Transport Parameters of Displacement Pulp Washing

Popis výsledku anglicky

The long-fibred spruce sulphite and kraft pulps, as well as short-fibred soda pulp cooked from rapeseed straw were subjected to displacement washing under laboratory conditions. Pure water was used as wash liquid, the conductivity of which was described by the permeability. The unmovable pulp bed was characterised by its average effective flow porosity, specific resistance, and equivalent pore diameter. The displacement washing process was divided into two periods. The first period, when spent liquor was displaced from the inter-fibre pores, was described by bed efficiency. The transport of solute in the second period, when leaching prevails, was characterised by the volumetric mass transfer coefficient. The results obtained showed that the bed efficiency increases with increasing Péclet number, however, it decreases with increasing dimensionless dispersion length. The bed efficiency obtained for long-fibred spruce pulps was found to be greater compared to that for short-fibred soda rapeseed pulp. The average volumetric mass transfer coefficient determined for all pulp types had an increasing trend with increasing superficial wash water velocity.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Cellulose Chemistry and Technology

ISSN

0576-9787

e-ISSN

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Svazek periodika

53

Číslo periodika v rámci svazku

9-10

Stát vydavatele periodika

RO - Rumunsko

Počet stran výsledku

10

Strana od-do

"929–938"

Kód UT WoS článku

000497989700011

EID výsledku v databázi Scopus

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