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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/34985
Title: Lipophilic extractives in process waters during manufacturing of totally chlorine free Kraft pulp from eucalypt wood
Authors: Gutiérrez Suárez, Ana ; Romero Sánchez, Javier; Río Andrade, José Carlos del
Keywords: Wood extractives
Kraft pulping
TCF bleaching
Paper pulp manufacturing
Issue Date: 2001
Publisher: Elsevier
Citation: Chemosphere 44(5): 1237-1242 (2001)
Abstract: The chemical composition of lipophilic extractives from process waters throughout a “totally chlorine free” (TCF) bleaching sequence after Kraft pulping of eucalypt wood has been studied. These compounds are among the most problematic wood constituents for both TCF and “zero liquid effluent” (ZLE) processes, since they tend to accumulate in circuits resulting in the formation of the so-called pitch deposits causing serious problems in the pulp and paper industry. Pitch deposits collected at different parts of the pulp mill were also characterized and their composition compared with that of lipophilic compounds in process waters and Eucalyptus globulus wood. The identification of these compounds from process waters, wood and pitch deposits was performed by gas chromatography and gas chromatography-mass spectrometry using short and medium-length high temperature capillary columns. Sterols, sterol esters, steroid ketones and steroid hydrocarbons were the main compounds identified. These chemical species arise from eucalypt wood extractives that survive the pulping and are released from pulp into the process waters during the bleaching process. Finally, they can deposit in pulp and on different parts of the mill or remain suspended in process waters being discharged in effluents.
Description: 1 Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, P.O. Box 1052, 41080-Seville, Spain 2 ENCE, Centro de Investigación y Tecnología, Ctra. Campañó, Ribeiro-Vao, 36157-Pontevedra, Spain; E-mail address: delrio@irnase.csic.es (J.C. del Río)
URI: http://hdl.handle.net/10261/34985
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