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Ionic Liquid–Liquid Extraction and Supported Liquid Membrane Analysis of Lipophilic Wood Extractives from Dissolving-Grade Pulp

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Abstract

In this study, the extraction of lipophilic wood extractives from dissolving pulp samples using ionic liquid–liquid extraction and a two phase hollow fibre supported liquid membrane was investigated. Ionic liquids are capable of dissolving a range of organic and polymeric compounds and are biodegradable, with a negligible vapour pressure. Pulp samples were dissolved in a suitable amount of molten 1-butyl-3-methylimidazolium chloride to give 5 % cellulose solution. Pure cellulose was regenerated by adding water and filtered off. The ionic liquid-aqueous filtrate was first extracted for lipophilic extractives using liquid–liquid extraction. Then, a two phase hollow fibre supported liquid membrane extraction of lipophilic extractives was performed to extract the derivatized compounds prior to analysis by gas chromatography mass spectrometry. The operational parameters of this sample preparation approach were optimised using sterols and fatty acid methyl esters. The variation of enrichment factors and extraction efficiency with respect to liquid membrane, extraction time, stirring speed and sample pH were observed and used to get the optimal parameters. The approach was used in the analysis of oxygen bleached dissolving pulp samples in which main compounds identified were fatty acids, sterols, fatty alcohols, steroid hydrocarbons and ketones. These compounds were similar to those obtained using molecular solvent extraction method, which indicated the absence of chemical reaction between extractives and ionic liquid used.

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Acknowledgments

Authors are grateful to the University of Johannesburg, for research facilities and CSIR, Forestry and Forestry Product Centre, Durban, South Africa for funding the study.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science, University of Johannesburg, Box 17011, Doornfontein, Johannesburg, 2028, South Africa

    Kessy F. Kilulya, Titus A. M. Msagati, Bhekie B. Mamba & J. Catherine Ngila

  2. School of Chemistry, University of KwaZulu-Natal, Durban, South Africa

    Tamara Bush

Authors
  1. Kessy F. Kilulya
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  2. Titus A. M. Msagati
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  3. Bhekie B. Mamba
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  4. J. Catherine Ngila
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  5. Tamara Bush
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Correspondence to Titus A. M. Msagati.

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Kilulya, K.F., Msagati, T.A.M., Mamba, B.B. et al. Ionic Liquid–Liquid Extraction and Supported Liquid Membrane Analysis of Lipophilic Wood Extractives from Dissolving-Grade Pulp. Chromatographia 75, 513–520 (2012). https://doi.org/10.1007/s10337-012-2225-5

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  • DOI: https://doi.org/10.1007/s10337-012-2225-5

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