SYNERGETIC EFFECT OF ALKALINE EXTRACTION AND XYLANASE TREATMENT ON CHLORINE DIOXIDE BLEACHING OF WHEAT STRAW PULP
Enhanced chlorine dioxide bleaching of wheat straw pulp by synergetic effect of alkaline extract and xylanase treatment (X) was investigated. The results demonstrated that the efficiency of ClO2 delignification (D) with single xylanase pretreatment was not improved significantly. Using the XDP and DXP bleaching sequences, the aided-bleaching effect of xylanase was limited and the final brightness was increased only by 1.5 points. However, xylanase treated pulp reduced the consumption of H2O2 by 25％ to 33.3％ in subsequent H2O2 (P) bleaching stage. By combining peroxide-reinforced extraction (EP) and xylanase treatment with the XDEPP and DXEPP bleaching sequences, the final brightness was enhanced up to 5.4 points over controls. With the same sequences, xylanase treated pulp reduced the charge of ClO2 by 17％ to 20％, equivalent to savings of 2kg ClO2 t-1 pulp, while still maintaining a comparative final brightness. The analysis of UV-Vis spectroscopy of chromophores released from xylanase-treated pulps showed a characteristic peak at 280 nm, indicating the presence of lignin or lignin-derived compounds in the released coloring matter.
alkaline extraction xylanase chlorine dioxide bleaching wheat straw pulp
Zhao Deqing Chen Kefu Ping Qingwei Yang Runan
Dalian Polytechnic University,Dalian,116034,China State Key Laboratory of Pulp and Paper Engineering State Key Laboratory of Pulp and Paper Engineering, South China University of Technology,Guangzhou, Dalian Polytechnic University,Dalian,116034,China
国际会议
广州
英文
550-553
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）