Abstract
Traditional chemical modifications of cellulose are usually done at low or medium consistencies. Processing at high solids content is expected to provide a leap forward in reduction of manufacturing costs such as minimization of chemical use, energy consumption and decreasing processing equipment size, while at the same time increasing reaction efficiency. In this research, high consistency modifications of cellulose were studied through cationization reaction. Four different laboratory scale high consistency reactors were tested and the effect of mixing on fiber properties was analyzed. All reactors decreased cellulose fiber length and no significant difference between cellulose starting consistencies and mixing time on fiber properties were found. The cationization reaction efficiency increased as the cellulose starting consistency increased in all of the tested reactors. In addition, mercerization of pulp as pretreatment, significantly increased reaction efficiency.
Highlights
Synthetic polymeric quaternary ammonium compounds are a class of conventional polyelectrolytes [1]
The cellulose materials used in this research were never-dried Enocell hardwood dissolving pulp (HWD) produced by Stora Enso, Finland and never-dried softwood kraft-grade (SWK) pulp produced by Mets€aFibre, Finland
Two different cellulose pulps were used in this research: hardwood dissolving pulp (HWD) and softwood kraft-grade pulp (SWK)
Summary
Synthetic polymeric quaternary ammonium compounds are a class of conventional polyelectrolytes [1] Article Nowe01349 adsorbent materials for dyes or heavy metal ions, flocculants in wastewater treatment and in cosmetics. Their disadvantages are that they are petroleum based, nonbiodegradable, and in many cases toxic to aquatic organisms [2]. Cationized cellulose as water-soluble derivatives or fibers are one important group of industrially produced cellulose derivatives that can be used to replace synthetic polyelectrolytes Their advantages are low cost, biodegradability and low toxicity [3, 4]. Cationized celluloses and other polysaccharides have been studied intensively in recent decades as flocculants, paper additives, hair care products and absorbent materials [3, 4, 5, 6, 7, 8]
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