Chromophore und Cellulosealterung
Abstract
The research project "Chromopres and cellulose aging" addresses the generation of chromophoric substances in cellulosic matrices and its underlying chemical mechanisms, novel opportunities to analyze chromophores and their presurcors on a molecular level, and new ways to minimize yellowing and optimize pulp bleaching sequences. The six work packages (WP1 - WP6) cover three closely interrelated topics. WP1 to WP3 address the question how process conditions and individual bleaching steps influence the content of carbonyls (precursor moieties for chromophores) in cellulose. This requires appropriate analytical methodology to be optimized and newly developed (chromatographic and spectroscopic techniques). The second group of work packages (WP4 - WP5) deals with metal ion management and the influence of metal ions on product quality (pulp, fibers, paper). The connection between chromophores and impurities, such as metal ions or extractives from the starting material) is studied. In order to optimize bleaching sequences, the mechanisms and products of the degradation of key chromophores under standardized bleaching conditions are investigated in WP6, building on results of the previous "Chromophore I" project.
keywords cellulose cellulosic pulp pulp bleaching chromophores fibers paper yellowing aging molar mass distribution bleaching sequences
Publikationen
Project staff
Thomas Rosenau
Univ.Prof. Dipl.-Chem. Dr.rer.nat. DDr.h.c. Thomas Rosenau
thomas.rosenau@boku.ac.at
Tel: +43 1 47654-77411, 77471
Project Leader
01.10.2014 - 30.06.2018
Antje Potthast
Univ.Prof. Dipl.-Chem. Dr.rer.nat. Antje Potthast
antje.potthast@boku.ac.at
Tel: +43 1 47654-77412, 77471
Sub Projectleader
01.10.2014 - 30.06.2018
Ute Henniges
Assoc. Prof. Dr. Ute Henniges
ute.henniges@boku.ac.at
Project Staff
01.10.2014 - 30.06.2018
BOKU partners
External partners
Lenzing AG
none
partner
ÖZEPA
Dr. Yvonne Groiss
partner
Zellstoff Pöls Aktiengesellschaft
none
partner
Sappi Austria Produktions-GmbH & Co. KG
none
partner