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Flocculation efficiency of chitosans for papermaking applications

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Nicu, Raluca and Bobu, Elena and Miranda Carreño, Rubén and Blanco Suárez, Ángeles (2013) Flocculation efficiency of chitosans for papermaking applications. Bioresources, 8 (1). pp. 768-784. ISSN 1930-2126

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Official URL: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_08_1_Nicu_768_Flocculation_Efficiency_Chitosan



Abstract

Bio-polymers have a large interest as environment-friendly alternatives to synthetic additives in papermaking. In this work, the behavior of three chitosans with different molecular weights and cationic charges were investigated as flocculation additives in papermaking on two systems: calcium carbonate (GCC) and pulp/GCC suspension. Comparison was made with two traditional cationic polymers used in wet end chemistry (poly-diallyldimethyl-ammonium chloride (PDADMAC) and poly-ethylene imine (PEI)). Flocculation efficiency was evaluated by flocculation parameters (mean floc size and number of counts) and by floc behavior under shear conditions, using a focused beam reflectance measurement (FBRM) technique. Results indicated different behaviors between the three chitosans when they were used for the flocculation of GCC and pulp/GCC suspensions. Chitosans were found to be more efficient over PDADMAC and PEI for flocculating small particles of the GCC suspension, but less efficient for increasing floc sizes, regardless of their MW or CCD. Flocculation parameters for pulp/GCC suspensions suggested the flocculation behavior of chitosan was close to that of PEI, but chitosan had higher efficiency and affinity towards cellulose fibers


Item Type:Article
Palabras clave (otros idiomas):Flocculation; Chitosan; Wet end additive; FBRM; Molecular weight; Charge density
Subjects:Sciences > Chemistry > Paper industry
Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Environmental conditions
Sciences > Chemistry > Chemistry, Technical
ID Code:26409
Deposited On:28 Nov 2014 11:58
Last Modified:28 Nov 2014 11:58

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