A Method for Integrated Optimization of Chlorine Dioxide Delignification of Bagasse Pulp

Yin, Yongjun; Song, Xueping; Li, Chongxin; Nie, Shuangxi

doi:10.15376/biores.13.1.1065-1074

Cited by 4 publications

(6 citation statements)

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“…The quality of pulp after bleaching is not only affected by bleaching temperature, but also by chemical dosages and bleaching time. According to our previous work, the brightness of pulp increases as the dosage of chemicals increases, and the brightness of pulp decreases when the bleaching temperature declines [20,21,28].…”

Section: System Configuration Of Typical Bleaching Processmentioning

confidence: 99%

“…According to the law of conservation of energy, the steam consumption of each stage can be obtained by dividing the energy required to provide each stage of slurry temperature increase by the latent heat of steam. The calculation equation of a single bleaching stage can be expressed by Equation ( 2) [28].…”

Section: Objective Functionmentioning

confidence: 99%

“…here, m p is the yield of bleached pulp; t/h; d p is the dryness of air-dried pulp and d p = 90%; c f (1.423) and c w (4.187) are the specific heat of the fiber and water respectively, kJ/(kg*K) [28]. C p = 10%, the concentration of the pulp; T out,i is the bleaching temperature of stage i, • C; T in (25) is the temperature of pulp entering the bleaching tower, • C; l i is the ratio of cellulose degradation in stage i, %; I s is the steam enthalpy, I s = 2855.5 kJ/kg (at 0.5 MPa, 200 • C).This paper focuses on minimizing the steam consumption, so the objectives function of optimization model (F(x)) can be expressed by Equation ( 10) according to Equations ( 1) and (2).…”

Section: Objective Functionmentioning

confidence: 99%

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A Method to Reduce Steam Consumption of ECF Bleaching Based on Operation Optimizing

Chen

Ma²,

Liu

et al. 2021

Processes

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Development of paper industry has been restricted by resources, energy and environment deeply; further reducing energy consumption becomes an urgent problem to be solved. In this paper, the calculating model of steam consumption in bleaching process is established under the premise of ensuring product quality and controlling bleaching cost. Then, an optimization model for minimizing steam consumption is constructed. Compared with before optimization, the steam consumption of the optimized bleaching system reduced by 19.48% (0.5014 t/adt) at a loss of 0.11% brightness (0.1 ISO%) and 5.17% viscosity (33 mL/g). The amount of chemicals should be increased to ensure the quality of the pulp while decreasing the bleaching temperature to reduce steam consumption, the cost of bleaching pulp has decreased by 1.62% (3.19 USD/adt) after optimization. The verification experiments showed all the pulp quality indices can meet the requirements of bleached pulp.

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Section: System Configuration Of Typical Bleaching Processmentioning

confidence: 99%

Section: Objective Functionmentioning

confidence: 99%

Section: Objective Functionmentioning

confidence: 99%

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A Method to Reduce Steam Consumption of ECF Bleaching Based on Operation Optimizing

Chen

Ma²,

Liu

et al. 2021

Processes

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“…Isoaho et al studied the degradation of AOX in the wastewater of cork sulfate pulp mill and found AOX removal rate was about 70% under certain Fenton reaction conditions (Isoaho et al, 2012). Some research about modeling, optimization of pulp bleaching had been done to reduce pollutant generation and bleaching costs in our previous work (Yin et al, 2018;Ma et al, 2020). At present, most of the studied focus on how to reduce AOX emissions theoretically in view of generation mechanism (Zhu et al, 2016(Zhu et al, , 2017Dai et al, 2016), and there are few studies on controlling AOX emissions by mathematical model.…”

Section: Introductionmentioning

confidence: 99%

Study on Measurement Model of Lignin Content in Pulp After Alkaline Extraction

Chen

Yin

et al. 2021

Journal of Environmental Engineering and Landscape Management

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Because kappa number cannot accurately represent the lignin content in the pulp after alkaline extraction, lead to the excessive dosage of bleaching chemicals added and the pollutant content increases. In order to accurately determine the dosage of bleaching agent, reduce pollutant emissions, a prediction model of lignin content of pulp was established by analyzing the correlation between lignin content and alkaline extraction conditions in this paper. The results show that the established soft sensor model can accurately measure lignin content, it is helpful to determine the amount of bleaching agent more accurately, reduce pollutant generation after pulp bleaching.

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“…Moreover, oxidation formed less toxic furan aldehydes and permits a better enzymatic convertibility of cellulose than for the steam-exploded material [20]. To this group belong all pretreatments that involved chemical reactions for the lignocellulosic structure disruption by means of organic or inorganic acids [21], alkali [22], organic solvents ( organosolv ) [23], and oxidative reagents as ozone [24] or active chlorine [25]. Recent developments have indicated that the effects of biological combined with oxidation pretreatment permits to improve the efficiency of delignification and enzymatic saccharification [26].…”

Section: Introductionmentioning

confidence: 99%

Lignin Degradation Efficiency of Chemical Pre-Treatments on Banana Rachis Destined to Bioethanol Production

et al. 2018

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Valuable biomass conversion processes are highly dependent on the use of effective pretreatments for lignocellulose degradation and enzymes for saccharification. Among the nowadays available treatments, chemical delignification represents a promising alternative to physical-mechanical treatments. Banana is one of the most important fruit crops around the world. After harvesting, it generates large amounts of rachis, a lignocellulosic residue, that could be used for second generation ethanol production, via saccharification and fermentation. In the present study, eight chemical pretreatments for lignin degradation (organosolv based on organic solvents, sodium hypochlorite, hypochlorous acid, hydrogen peroxide, alkaline hydrogen peroxide, and some combinations thereof) have been tested on banana rachis and the effects evaluated in terms of lignin removal, material losses, and chemical composition of pretreated material. Pretreatment based on lignin oxidation have demonstrated to reach the highest delignification yield, also in terms of monosaccharides recovery. In fact, all the delignified samples were then saccharified with enzymes (cellulase and beta-glucosidase) and hydrolysis efficiency was evaluated in terms of final sugars recovery before fermentation. Analysis of Fourier transform infrared spectra (FTIR) has been carried out on treated samples, in order to better understand the structural effects of delignification on lignocellulose. Active chlorine oxidations, hypochlorous acid in particular, were the best effective for lignin removal obtaining in the meanwhile the most promising cellulose-to-glucose conversion.

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A Method for Integrated Optimization of Chlorine Dioxide Delignification of Bagasse Pulp

Cited by 4 publications

References 0 publications

A Method to Reduce Steam Consumption of ECF Bleaching Based on Operation Optimizing

A Method to Reduce Steam Consumption of ECF Bleaching Based on Operation Optimizing

Study on Measurement Model of Lignin Content in Pulp After Alkaline Extraction

Lignin Degradation Efficiency of Chemical Pre-Treatments on Banana Rachis Destined to Bioethanol Production

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