Effect of fiber modification with carboxymethyl cellulose on the efficiency of a microparticle flocculation system
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Sedat Ondaral
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Orçuun Kurtuluş
Abstract
Carboxymethyl cellulose (CMC) has been used widely to enhance dry strength of paper and uniformity of sheet in the papermaking industry. Besides these positive effects, it may affect the fines retention and dewatering processes negatively. These negative effects are mainly seen when fiber modifications with high CMC dosages are studied in laboratory scale. In this paper, the effect of fiber modification with CMC on the deposition of precipitated calcium carbonate (PCC) and on the dewatering process in the presence of cationic polyacrylamide (CPAM)/bentonite microparticle flocculation system is examined. It was determined that fiber modification with 10 mg g−1 of CMC decreased PCC deposition at the initial addition of CPAM and gave better PCC deposition at 2 mg g−1 of CPAM. It was also observed that PCC deposition on unmodified fibers is higher at lower CPAM concentration. PCC deposition was found as almost stable after a maximum value obtained at 0.5 mg g−1 of bentonite concentration for fiber modified with 40 mg g−1 of CMC. This indicates that interaction between CPAM and bentonite particles changed due to higher surface charge and CMC conformation on fibers. Results of the dewatering experiments showed that CMC modification increased the drainage time due to a denser and more plugged sheet. This negative effect was compensated with higher concentrations of CPAM and bentonite. On the other hand, dewatering is also affected by the mass ratio of CMC and CPAM, which was not the optimum one in this study at lower of CPAM. Thus, the increase in the drainage time in the presence of CMC on the fiber surface could be also caused by incorrect ratios of chemicals because the effect of CMC on the drainage time was not observed at higher concentrations of CPAM.
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© 2010 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Application of polyaniline as an efficient and novel adsorbent for azo dyes removal from textile wastewaters
- Enzymatic synthesis and analytical monitoring of terpene ester by 1H NMR spectroscopy
- Effect of fiber modification with carboxymethyl cellulose on the efficiency of a microparticle flocculation system
- Synthesis, crystal structure, and thermal analysis of a copper(II) complex with imidazo[4,5-f]1,10-phenantroline
- Hydrothermal synthesis of core-shell structured PS@GdPO4:Tb3+/Ce3+ spherical particles and their luminescence properties
- Optical characterisation of organosilane-modified nanocrystalline diamond films
- Synthesis, optical, and spectroscopic characterisation of substituted 3-phenyl-2-arylacrylonitriles
- A new group of potential antituberculotics: N-(2-pyridylmethyl)salicylamides and N-(3-pyridylmethyl)salicylamides
- Synthesis and antimicrobial properties of new 2-((4-ethylphenoxy)methyl)benzoylthioureas
- Synthesis, characterisation, and biological activity of three new amide prodrugs of lamotrigine with reduced hepatotoxicity
- Comparative study of CTAB adsorption on bituminous coal and clay mineral
- Density of the systems (NaF/AlF3)—AlPO4 and (NaF/AlF3)—NaVO3
- Semiquinol and phenol compounds from seven Senecio species
- Determination of the enthalpy of fusion of K3NbO2F4
