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Mechanism of pitch adsorption on carboxyl methyl dextran surfaces


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Murray, G, Stack, KR, McLean, DS, Shen, W and Garnier, G 2009 , 'Mechanism of pitch adsorption on carboxyl methyl dextran surfaces' , Appita Journal, vol. 62, no. 1 , pp. 64-69 .

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The direct adsorption of pitch particles
onto pulp fibres was investigated as a
pitch control strategy. The affinity of colloidal
pitch for carboxyl methyl dextran
(CMD) surfaces was studied by surface
plasmon resonance (SPR) spectroscopy
and optical microscopy. CMD was selected
as model surface representing the cellulose
and hemicellulose fractions of the
pulp fibres. The dynamics of adsorption
and desorption of concentration pulses of
colloidal pitch on carboxy methyl dextran
were followed at the solid-liquid interface
in real time by SPR. The parameters
investigated were temperature, pitch concentration
and sequence of pitch build up.
The direct adsorption of pure colloidal
pitch onto pulp fibres is not an option for
papermaking. This is because of the very
low chemical affinity measured between
pitch and the model CMD polysaccharide.
Virtually no pitch remains adsorbed by
chemical interaction on CMD surfaces
submitted to low shear. In spite of its low
affinity for polysaccharides, colloidal pitch
can be carried by fibres as the low desorption
rate might not allow full particle
desorption during the time frame of the
forming process, and some physical
entrapment might also occur. Pitch has a
stronger affinity for pitch covered surfaces
than for polysaccharides.

Item Type: Article
Authors/Creators:Murray, G and Stack, KR and McLean, DS and Shen, W and Garnier, G
Keywords: Pitch adsorption, surface plasmon resonance (SPR), carboxy methyl dextran, liquid-solid interface, paper making.
Journal or Publication Title: Appita Journal
ISSN: 1038-6807
Additional Information:

Copyright 2009 Appita Journal

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