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Effect of composition and process variables on colloidal stability of Pinus radiata wood extractives


Stack, KR and Yaqoob, N and Ngwenya, E and Lewis, TW and Richardson, DE, Effect of composition and process variables on colloidal stability of Pinus radiata wood extractives, Fibre Value Chain 2017 Conference Technical Papers, 14-16 November 2017, Melbourne, pp. 107-115. ISBN 9780987168498 (2017) [Refereed Conference Paper]

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The effects of the interaction between process variables of pH, temperature, soluble calcium and dissolved organics (DOM) on the colloidal stability of Pinus radiata wood extractives at two different compositions representing the maximum and minimum in ester to acid ratio (EAR) were investigated. The EAR of the extracts was found to significantly affect the wood extract colloidal properties. Low EAR (EAR=0.31) extracts were found to be more unstable and more susceptible to deposition and destabilisation by soluble Ca than higher EAR (EAR=0.67) extracts. Complex interactions between the various process variables were found. In particular, the DOM level was found to cause both stabilisation and destabilisation depending on the DOM concentration and the pH. This was more apparent in the higher EAR extract. Predictive modelling of the effect of process variables on pitch deposition and colloidal stability was undertaken. Modelling of the individual wood extracts was found to be more reliable that the total extract and demonstrated that competing interactions between the process variables and their effect on the components was occurring.

Item Details

Item Type:Refereed Conference Paper
Keywords:Pinus radiata, wood extractives, colloidal stability, regression modelling, ester to acid ratio, dissolved organics
Research Division:Chemical Sciences
Research Group:Other chemical sciences
Research Field:Other chemical sciences not elsewhere classified
Objective Division:Manufacturing
Objective Group:Wood, wood products and paper
Objective Field:Paper products and pulp
UTAS Author:Stack, KR (Dr Karen Stack)
UTAS Author:Yaqoob, N (Dr Naila Yaqoob)
UTAS Author:Ngwenya, E (Dr Elkana Ngwenya)
UTAS Author:Lewis, TW (Associate Professor Trevor Lewis)
ID Code:122714
Year Published:2017
Deposited By:Chemistry
Deposited On:2017-11-23
Last Modified:2018-05-22

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