Comparative Studies of Chlorine Dioxide Reactions with Muconic Acid Derivatives and Lignin Model Compounds

2006 ◽  
Vol 26 (2) ◽  
pp. 153-164 ◽  
Author(s):  
Yahya Hamzeh ◽  
Gerard Mortha ◽  
Dominique Lachenal ◽  
Jean Christophe Hostachy ◽  
Christophe Calais
Keyword(s):  
Chlorine Dioxide ◽  
Comparative Studies ◽  
Model Compounds ◽  
Muconic Acid ◽  
Lignin Model Compounds ◽  
Lignin Model

scholarly journals Effect of lignin structure on adsorbable organic halogens formation in chlorine dioxide bleaching

2019 ◽  
Vol 6 (2) ◽  
pp. 182024 ◽  
Author(s):  
Lisheng Shi ◽  
Jiayan Ge ◽  
Shuangxi Nie ◽  
Chengrong Qin ◽  
Shuangquan Yao
Keyword(s):  
Chlorine Dioxide ◽  
Model Compound ◽  
Pulp Bleaching ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model Compound ◽  
Lignin Model ◽  
Organic Halogens ◽  
Adsorbable Organic Halogens ◽  
Lignin Structure

Adsorbable organic halogens (AOX) are formed in pulp bleaching as a result of the reaction of residual lignin with chlorine dioxide. The natural structure of lignin is very complex and it tends to be damaged by various extraction methods. All the factors can affect the study about the mechanism of AOX formation in the reaction of lignin with chlorine dioxide. Lignin model compounds, with certain structures, can be used to study the role of different lignin structures on AOX formation. The effect of lignin structure on AOX formation was determined by reacting phenolic and non-phenolic lignin model compound with a chlorine dioxide solution. Vanillyl alcohol (VA) and veratryl alcohol (VE) were selected for the phenolic and non-phenolic lignin model compound, respectively. The pattern consumption of lignin model compounds suggests that both VA and VE began reacting with chlorine dioxide within 10 min and then gradually steadied. The volume of AOX produced by VE was significantly higher than that produced by VA for a given initial lignin model compound concentration. In a solution containing a combination of VA and VE in chlorine dioxide, VE was the dominant producer of AOX. This result indicates that the non-phenolic lignin structure was more easily chlorinated, while the phenolic lignin structure was mainly oxidized. In addition, AOX content produced in the combined experiments exceeded the total content of the two separate experiments. It suggested that the combination of phenolic and non-phenolic lignin structure can promote AOX formation.

scholarly journals Oxidation of Lignin Model Compounds with Chlorine Dioxide and Chlorite. Reactions with Stilbenes.

1974 ◽  
Vol 28b ◽  
pp. 847-852 ◽  
Author(s):  
Bengt O. Lindgren ◽  
Torsten Nilsson ◽  
Tommy Liljefors ◽  
Jan Sandström
Keyword(s):  
Chlorine Dioxide ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model

Kinetics study of oxidation of the lignin model compounds by chlorine dioxide

2014 ◽  
Vol 241 ◽  
pp. 410-417 ◽  
Author(s):  
Shuangxi Nie ◽  
Xinliang Liu ◽  
Zhengmei Wu ◽  
Lei Zhan ◽  
Guodong Yin ◽  
...  
Keyword(s):  
Chlorine Dioxide ◽  
Kinetics Study ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model

Oxalate formation during ClO2 bleaching of bamboo kraft pulp

2020 ◽  
Vol 35 (1) ◽  
pp. 18-24
Author(s):  
Hailong Li ◽  
Chao Du ◽  
Shujuan Ge ◽  
Mengru Liu
Keyword(s):  
Chlorine Dioxide ◽  
Kraft Pulp ◽  
Reaction System ◽  
Kappa Number ◽  
Pulp Bleaching ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Bleaching Process ◽  
Prolonged Reaction Time ◽  
Lignin Model

AbstractThis study aimed to investigate the oxalate formation mechanism during chlorine dioxide ({\mathrm{ClO}_{2}}) bleaching of bamboo kraft pulp, and thus explore favourable {\mathrm{ClO}_{2}} bleaching conditions to better control oxalate formation. The amount of oxalate formed varied linearly with {\mathrm{ClO}_{2}} dosage within the whole research range, while it rose exponentially within the first 90 mins of pulp bleaching. Then the actual bleaching process was simulated by reacting {\mathrm{ClO}_{2}} with three representative lignin model compounds and comparatively studied. The rule of oxalate formation in the simulated reaction system was identical to that in pulp bleaching by {\mathrm{ClO}_{2}}, except for oxalate production by veratraldehyde with prolonged reaction time. Under identical conditions, vanillin formed the highest amount of oxalate, while veratraldehyde formed the least. Furthermore, the amount of oxalate formed increased by 19.59 mg/kg when the kappa number of the delignified pulp was reduced by one unit. Considering the satisfactory pulp brightness and decreased oxalate formation, the recommended conditions for {\mathrm{ClO}_{2}} bleaching of bamboo kraft pulp were a {\mathrm{ClO}_{2}} dosage of 4 %, 60 °C and 70 mins.

Molecular basis of laccase bound to lignin: insight from comparative studies on the interaction of Trametes versicolor laccase with various lignin model compounds

RSC Advances ◽  
2015 ◽  
Vol 5 (65) ◽  
pp. 52307-52313 ◽  
Author(s):  
Ming Chen ◽  
Guangming Zeng ◽  
Cui Lai ◽  
Jian Li ◽  
Piao Xu ◽  
...  
Keyword(s):  
Comparative Studies ◽  
Molecular Basis ◽  
Trametes Versicolor ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model ◽  
Binding Orientation

Binding orientation of lignin model compounds in laccase.

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