Impact of dissolved lignin in oxygen delignification and chlorine dioxide stages
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چکیده
منابع مشابه
Influence of Nonprocess Elements on Lignin Structure During Oxygen Delignification
A series of kraft pulps were prepared in which the level of calcium was selectively enriched and depleted. These pulps were then oxygen delignified, and the pulps were characterized according to kappa number and viscosity. The residual lignin samples were isolated via acid-hydrolysis and characterized by NMR techniques. The results indicated that the presence of nonprocess elements could impact...
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A hardwood-based biorefinery process starting with hot-water extraction (HWE) is recommended in order to remove most of the hemicelluloses/xylans before further processing. HWE may be followed by delignification in acetone/water in the presence of oxygen (AWO) for the production of cellulose and lignin. In this study, the HWE-AWO sequence was evaluated for its effectiveness at removing lignin f...
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Chemical pulps are produced by chemical delignification of lignocelluloses such as wood or annual non-woody plants. After pulping (e.g., kraft pulping), the remaining lignin is removed by bleaching to produce a high quality, bright paper. The goal of bleaching is to remove lignin from the pulp without a negative effect on the cellulose; for this reason, delignification should be performed in a ...
متن کاملTransition Metal-catalysed Oxidation of Lignin Model Compounds for Oxygen Delignification of Pulp
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متن کاملChlorine Dioxide and Chlorite
The primary purpose of this chapter is to provide public health officials, physicians, toxicologists, and other interested individuals and groups with an overall perspective on the toxicology of chlorine dioxide and chlorite. It contains descriptions and evaluations of toxicological studies and epidemiological investigations and provides conclusions, where possible, on the relevance of toxicity...
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ژورنال
عنوان ژورنال: TAPPI Journal
سال: 2016
ISSN: 0734-1415
DOI: 10.32964/tj15.3.167