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

conference contribution
posted on 2023-05-23, 12:57 authored by Karen Stack, Naila YaqoobNaila Yaqoob, Ngwenya, E, Trevor LewisTrevor Lewis, Richardson, DE
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.

History

Publication title

Fibre Value Chain 2017 Conference Technical Papers

Pagination

107-115

ISBN

9780987168498

Department/School

School of Natural Sciences

Publisher

Appita Inc.

Place of publication

Australia

Event title

Fibre Value Chain 2017 Conference

Event Venue

Melbourne

Date of Event (Start Date)

2017-11-14

Date of Event (End Date)

2017-11-16

Rights statement

Copyright 2017 Appita, Inc.

Repository Status

  • Restricted

Socio-economic Objectives

Paper products and pulp

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    University Of Tasmania

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