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

Nie, Shuangxi; Liu, Xinliang; Wu, Zhengmei; Zhan, Li; Yin, Guodong; Yao, Shuangquan; Song, Hainong; Wang, Shuangfei

doi:10.1016/j.cej.2013.10.068

Cited by 86 publications

(54 citation statements)

References 26 publications

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“…The experimental results showed the order of H + reaction was smaller, which indicates that H + plays a catalytic role in the reaction. H + concentration has an influence on AOX formation (Nie et al 2014). AOX formation increased from 0.42 to 0.68 kg.t -1 pulp when the H + concentration increased from pH 3 to pH 2.…”

Section: Effect Of Ph On Aox Formationmentioning

confidence: 99%

“…Many recent studies have focused on pulp bleaching kinetics (Hart and Rudie 2012;Nie et al 2014). Therefore, there were only three main factors considered in this paper: the effects of ClO2, H + , and lignin on the formation of AOX.…”

Section: Establishment Of Kinetics Modelmentioning

confidence: 99%

“…Therefore, there were only three main factors considered in this paper: the effects of ClO2, H + , and lignin on the formation of AOX. Referring to chemical reaction kinetics and the basis of existing research (Tarvo et al 2010;Nie et al 2014), the kinetic model for AOX formation during the ClO2 bleaching of eucalyptus kraft pulp can be expressed as Eq. 1,…”

Section: Establishment Of Kinetics Modelmentioning

confidence: 99%

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Kinetics of Adsorbable Organic Halogen Formation During the First Chlorine Dioxide Bleaching Stage of Eucalyptus Kraft Pulp

Zhu¹,

Yao²,

Lei³

et al. 2016

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The emission standard for adsorbable organic halogen (AOX) has been adjusted as a mandatory assessment indicator in the papermaking industrial pollutants emission standards of China. To provide a theoretical basis to reduce AOX formation, a kinetic model of the first chlorine dioxide bleaching stage (D0) is presented for elemental chlorinefree (ECF) bleaching of eucalyptus kraft pulp. . R 2 was greater than 0.9, which means that the model was shown to have high prognostic ability and feasibility. In the D0 stage, mostly lignin was removed and the reaction was fast. Much AOX was formed at the beginning of bleaching, and the reaction rate was primarily determined by the lignin content and chlorine dioxide dosage. H + existed primarily as a catalyst and had little influence on AOX formation. The AOX formation occurs easily, as the reaction activation energy is less than 30 kJ.mol -1 .

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Section: Effect Of Ph On Aox Formationmentioning

confidence: 99%

Section: Establishment Of Kinetics Modelmentioning

confidence: 99%

Section: Establishment Of Kinetics Modelmentioning

confidence: 99%

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Kinetics of Adsorbable Organic Halogen Formation During the First Chlorine Dioxide Bleaching Stage of Eucalyptus Kraft Pulp

Zhu¹,

Yao²,

Lei³

et al. 2016

BioResources

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“…The traditional bleaching of CEH has been replaced by ECF and TCF bleaching technology [1]. In recent years, chlorine dioxide was adopted as the main reagent of bleaching [2,3]. The advantage is that the formation of dioxins and absorbable organic halogens (AOx) was reduced in effluent [4,5].…”

Section: Introductionmentioning

confidence: 99%

Absorbable Organic Halide Reduction Research in Elemental Chlorine-Free Bleaching of Eucalyptus Kraft Pulp

Yao¹,

Gao²,

Zhu³

et al. 2017

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ABSTRACT:The parameters of elemental chlorine-free (eCf) bleaching (D 0 E p D 1 ) of eucalyptus kraft pulp were optimized to reduce aox formation. The optimal conditions were pulp concentration 10%, Clo 2 dosage 2.8%, ph 3.5, temperature 60°C, time 60 min at D 0 ; h 2 o 2 dosage 1.25%, alkali dosage 2.0%, temperature 65°C, time 105 min at E p ; Clo 2 dosage 0.2%, ph 4.5, temperature 60°C, time 55 min at D 1 . aox formation was 0.553 kg.tp -1 , each stage was 0.470 kg.tp -1 , 0.060 kg.tp -1 and 0.023 kg.tp -1 , respectively. Compared with un-optimized aox formation decreased by 23.7%.The brightness and viscosity was 84.36% iSo, 834.6 mL.g -1 . in fact, good quality of the pulp was obtained when aox formation has fallen dramatically. These provide a theoretical basis for reducing the produce of aox and realizing the clean bleaching.

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“…Therefore, in order to understand the difference in abilities to hydrolyze polysaccharides (especially glucan) into monosaccharides using H2SO3 and two other acids, MGPα was selected as the carbohydrate model compound (Bragd et al 2000;Ciriminna et al 2000;Nakagawa et al 2015). Creosol and vanillyl alcohol as lignin model compounds (Carvalho et al 1998;Nie et al 2014) were employed to check their effect on glucose yield during acid hydrolysis. The molecular structures of three models are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Decomposition Study of Methyl α-D-Glucopyranoside (MGPα) and Lignin Model Compounds for better Glucose Yield during Sulfurous Acid Treatment

et al. 2017

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From the perspective of bio-refinery, sulfurous acid (H2SO3) treatment of lignocellulosic biomass is attractive because of its ability to act both as an acid catalyst and as a sulfonation agent. Therefore, its capability to hydrolyze polysaccharides (especially glucan) into monosaccharides was compared with two other acids, hydrochloric and sulfuric acids. The decomposition of methyl α-D-glucopyranoside (MGPα) in these three acids, hydrochloric, sulfuric, and sulfurous acids were studied. In addition, p-creosol and vanillyl alcohol were introduced to check whether it is possible to convert polysaccharides (such as hemicelluloses) into monosaccharides during the sulfurous acid treatment. The results showed that the decomposition of MGPα is much slower in H2SO3 than in HCl and H2SO4. The ligninsulfonic acid resulting from the lignin sulfonation reaction can be expected to improve the efficiency of hydrolysis of polysaccharides into monosaccharides during sulfurous acid treatment. Moreover, a higher actual yield of glucose was obtained in this case than in the other two acids. .

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

Cited by 86 publications

References 26 publications

Kinetics of Adsorbable Organic Halogen Formation During the First Chlorine Dioxide Bleaching Stage of Eucalyptus Kraft Pulp

Kinetics of Adsorbable Organic Halogen Formation During the First Chlorine Dioxide Bleaching Stage of Eucalyptus Kraft Pulp

Absorbable Organic Halide Reduction Research in Elemental Chlorine-Free Bleaching of Eucalyptus Kraft Pulp

Decomposition Study of Methyl α-D-Glucopyranoside (MGPα) and Lignin Model Compounds for better Glucose Yield during Sulfurous Acid Treatment

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