Md. Sarwar JAHAN, Md. Milton HOSEN, Md. Mostafizur RAHMAN

Comparative study on the prebleaching of bamboo and hardwood pulps produced in Kharnaphuli Paper Mills

In order to lower bleaching costs, various prebleaching methods have been investigated. In the current work 3 prebleaching methods, peroxyformic acid, oxygen, and xylanase, were investigated in bamboo and hardwood kraft pulp produced by Kharnaphuli Paper Mills. Among these 3 methods, peroxyformic acid showed the most promising results. Peroxyformic acid prebleaching reduced kappa numbers by 38% and 30% and increased brightness by 12.2% and 8.6% in hardwood and bamboo pulp, respectively. Using 30 kg ClO2 t-1 of pulp, hardwood pulp attained 77.2% brightness, while peroxyformic-acid-prebleached pulp attained 86% brightness without a reduction in viscosity in D0EpD1 bleaching sequences. To achieve 80% brightness, peroxyformic acid prebleaching saved 33% ClO2, while oxygen prebleaching saved 17% ClO2. Xylanase prebleaching was not an efficient method for these pulps. Bamboo pulp showed lower bleachability than hardwood pulp. The papermaking properties of the bleached pulps did not show significant variation after prebleaching, with the exception of tear index in peroxyformic-acid-prebleached pulp. When considering bleachability and papermaking properties, peroxyformic acid was the best prebleaching option for reducing ClO2 consumption.

Anahtar Kelimeler:

Key words: Mixed hardwood and bamboo pulp, prebleaching, peroxyformic acid, brightness

Comparative study on the prebleaching of bamboo and hardwood pulps produced in Kharnaphuli Paper Mills

Keywords:

Key words: Mixed hardwood and bamboo pulp, prebleaching, peroxyformic acid, brightness,

PDF

___

Bajpai P, Bhardwaj NK, Bajpai PK, Jauhari MB (1994) The impact of xylanases on bleaching of eucalyptus kraft pulp. J Biotechnol 38: 1–6.
Brage C, Eriksson T, Gierer J (1991) Reactions of chlorine dioxide with lignins in unbleached pulps. Part I. Holzforschung 45: 23–
Fernandez EO, Young RA (1996) Properties of cellulose pulps from acidic and basic processes. Cellulose 3: 21–44.
Gierer J (1982) The chemistry of delignification. A general concept. Part II. Holzforschung 36: 55–64.
Gierer J, Imsgard F (1977) The reactions of lignins with oxygen and hydrogen peroxide in alkaline media. Svensk Papperstidning 16: 510–518.
Gustavsson C, Sjöstrom K, Al-Dajani W (1999) The influence of cooking conditions on the bleachability and chemical structure of kraft pulps. Nordic Pulp Paper Research J 14: 71–81.
Hortling B, Poppius K, Sundquist J (1991) Formic acid/peroxyformic acid pulping IV. Lignins isolated from spent liquors of threestage peroxyformic acid pulping. Holzforschung 45: 109–120.
Ikeda T, Hosoya S, Tomimura Y, Magara K, Takano I (1999a) Sulfuric acid bleaching of kraft pulp I: bleaching of hardwood and softwood kraft pulps. J Wood Sci 45: 233–237.
Ikeda T, Tomimura Y, Magara K, Hosoya S (1999b) Sulfuric acid bleaching of kraft pulp II: behavior of lignin and carbohydrate during sulfuric acid bleaching. J Wood Sci 45: 313–318.
Ikeda T, Tomimura Y, Magara K, Ishihara M, Hosoya S (1999c) Sulfuric acid bleaching of kraft pulp III: reactivity of kraft pulping resistant structures under acidic conditions. J Wood Sci 45: 417–424.
Jahan MS, Chowdhury DAN, Islam MK, Ahmed FN (2006) Elemental chlorine free and total chlorine free bleaching of soda-AQ cotton stalks pulps. J Asiatic Soc Bangladesh 32: 179–186.
Jahan MS, Lee ZZ, Jin Y (2005) Organic acid pulping of rice straw, part-II: bleaching and beating. Cellulocse Chem Technol 39: 85–
Jahan MS, Rubaiyat A, Sabina R (2007) Influence of cooking conditions on pulp properties in kraft pulping. Japan TAPPI J 61: 1307–1373.
Kantalinen A, Sundquist J, Linko M, Viikari L (1991) The role of reprecipitated xylan in the enzymatic bleaching of kraft pulp. In: Proceedings of the 6th International Symposium of Wood and Pulping Chemistry 1: 493–500.
Lawrence W, McKelvey RD, Johnson DC (1980) The peroxyacetic acid oxidation of a lignin-related β-aryl ether. Svensk Papperstidn 83: 11–18.
Lindgren BO (1971) Chlorine dioxide and chlorite oxidations of phenols related to lignin. Svensk Papperstidning 83: 363–369.
Masura V (1993) Delignification and degradation of kraft pulp during oxygen bleaching. Cellul Chem Technol 27: 201–215.
McDonough TJ (1996) Oxygen delignification. In: Pulp Bleaching: Principles and Practice (Eds. CW Dence, DW Reeve). TAPPI Press, Atlanta, pp. 213–239.
Mire M, Mlayah BB, Delmas M, Bravo R (2005) Formic acid/acetic acid pulping of banana stem (Musa cavendish). Appita J 58: 393–396.
Mohta D, Upadhaya JS, Kapoor SK, Roy AK, Roy DN (1998) Oxygen delignification of soda and soda-AQ bagasse pulps. TAPPI J 81: 184–187.
Perez DDS, Terrones MGH, Grelier S, Nourmamode A, Castellan A (1998) Peroxyformic acid pulping of Eucalyptus grandis wood chips and sugar cane bagasse in one stage and characterization of the isolated lignins. J Wood Chem Technol 18: 333–365.
Sahin HT, Young RA (2008) Auto-catalyzed acetic acid pulping of jute. Ind Crops Prods 28: 24–28.
Samuelson OH, Ojteg UO (1994) Optimized oxygen bleaching of kraft pulp treated with nitrogen dioxide. TAPPI J 77: 127–133.
Siddhartha DW, Surendra PK, Singh P (2010) Prebleaching of mixed hardwood pulp with sulphuric acid. J Indian Acad Wood Sci 7: 30–35.
Strumila G, Rapson H (1975) Reaction products of neural peracetic acid oxidation of model lignin phenols. Pulp Paper Can 76: 72–
Sun RC, Tomkinson J, Zhu W, Wang SQ (2000) Delignification of maize stems by peroxymonosulfuric acid, peroxyformic acid, peracetic acid, and hydrogen peroxide. 1. Physicochemical and structural characterization of the solubilized lignins. J Agric Food Chem 48: 1253–1262.
Suurnakki A, Kantelinen A, Buchert J, Viikari L (1994) Enzymeaided bleaching of industrial softwood kraft pulps. TAPPI J 77: 111–116.
Tolan JS, Collins J (2004) Use of xylanase in the production of bleached, unrefined pulp at Marathon Pulp Inc. Pulp & Paper Canada 105: 7 T167–T169.
Vicuña R, Escobar F, Osses M, Jara A (1997) Bleaching of eucalyptus kraft pulp with commercial xylanases. Biotechnol Lett 19: 575–578.
Viikari L, Kantelinen A, Sundquist J, Linko M (1994) Xylanases in bleaching: from an idea to the industry. FEMS Microbiol Rev 13: 335–350.
Viikari L, Ranua M, Kantelinen A, Sundquist J, Linko M (1986) Bleaching with enzymes. In: Proceedings of the 3rd International Conference of Biotechnology on Pulp and Paper Industry, Stockholm, Sweden, pp. 67–69.
Young RA, Davis JL (1986) Organic acid pulping of wood. Part II: acetic acid pulping of aspen. Holzforschung 40: 99–108.
Yuan Z, Ni Y, Heiningen AV (1998) An improved peracetic acid bleaching process. Appita J 51: 377–380.