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http://dx.doi.org/10.7584/ktappi.2015.47.4.081

Effect on Bleaching Efficiency by Chelating Treatment in Sugarcane Bagasse DEDP Bleaching Process  

Lee, Jai-Sung (Department of Wood and Paper Science, Chungbuk National University)
Song, Woo-Yong (Department of Wood and Paper Science, Chungbuk National University)
Park, Jong-Moon (Department of Wood and Paper Science, Chungbuk National University)
Shin, Soo-Jeong (Department of Wood and Paper Science, Chungbuk National University)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.47, no.4, 2015 , pp. 81-87 More about this Journal
Abstract
Soda-AQ pulp made from sugarcane bagasse (SCB) were bleached in element chlorine free (ECF) sequence. To reduce chlorine dioxide use, final peroxide bleaching was introduced. Prior to peroxide bleaching, different chelating chemicals were applied for comparative analysis in ISO brightness and viscosity. When using equal total chlorine dioxide usage (4.5%), bleached SCB pulp using chelate and hydrogen peroxide (DEDQP) was reached 86.8% (DTPA), 86.4% (EDTA) ISO brightness, whereas bleached pulp using only hydrogen peroxide (DEDP) reached at 81.2% ISO brightness. Viscosity of DEDQP bleached pulp was 25.6 cPs (DTPA), 25.2 cPs (EDTA), And DEDP bleached pulp was shown 18.0 cPs viscosity. Decreasing of transition metal by chelate process led to improvements in final brightness along with higher viscosity. Due to EDTA is 5-7 times cheaper than DTPA, EDTA is recommended as chelating chemical prior to peroxide bleaching.
Keywords
ECF bleaching; brightness; chlorine dioxide; sugarcane bagasse; chelate; hydrogen peroxide;
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