Applied paper chemistry -: Influence of surfactant structure on bubble size and foaming in bubble columns:: Focus on flotation de-inking

被引:6
作者
Beneventi, David
Belgacem, M. Naceur
Garre, Bruno
机构
[1] Ecole Francaise Papeterie Ind Graph, INPG, LGP2, UMR5518, F-38402 St Martin Dheres, France
[2] Ctr Tech Ind Papiers Cartons & Celluloses, F-38044 Grenoble 9, France
关键词
non-ionic surfactants; adsorption; air bubble size; foam; flotation de-inking;
D O I
10.3183/npprj-2006-21-05-p702-709
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
The stabilization of air bubbles and foaming in the presence of nonyl phenol ethoxylate surfactants and sodium dodecyl sulphate were investigated by using a laboratory bubble column. Images of air bubbles were taken at increasing surfactant dosage and corresponding bubble size distributions were correlated with surfactant type and concentration, showing that the longer the PEO chain the more pronounced bubble stabilization. Model equations proposed in the literature were used to explain the influence of surfactants molecular structure on liquid film drainage and bubble stabilization. The foaming behaviour of surfactant solutions was evaluated by measuring the thickness of the foam layer generated at the top of the bubble column after 1 min bubbling. Bubble size distributions and bubble retention time in the column were used to interpret the foaming behaviour of tested surfactants, to define a foaming criterion and to draw some conjectures on the role of surfactant structure during flotation de-inking.
引用
收藏
页码:702 / 709
页数:8
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