Prediction models of pulp components based on the quality indices in bleaching process

Ma, Zhichao; Chen, Shaoxu; Yin, Yongjun; Lu, Xiaodan; Zhou, Yanying; Lin, Ting‐Tse

doi:10.1007/s10668-020-00755-5

Cited by 5 publications

(5 citation statements)

References 15 publications

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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 Equations ( 2) and ( 3), it can be seen that when the number of bleaching stages, pulp concentration (C p,i ) and initial bleaching pulp temperature (T in ) are determined, the steam consumption of the bleaching process is mainly affected by the bleaching temperature. From our previous research, it can be found that the bleaching temperature will affect the brightness, viscosity and the cost of bleaching [20,21,28].…”

Section: Objective Functionmentioning

confidence: 99%

“…In view of the above-mentioned problems, the paper hopes to establish a systematically mathematical model of the bleaching system to reduce the energy consumption of the bleaching process. Relevant models of the bleaching process established in our previous research are the basis of this study, such as pulp quality models measured by brightness, viscosity and Kappa number [20], and correlation between chlorine dioxide bleaching and components of pulp [21]. Additionally, results from this past work are employed to develop mathematical relationships between the operating conditions, e.g., the amount of chemicals, bleaching temperature and energy consumption.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…18,19 We also studied the effects of operating conditions on the three components (cellulose, hemicellulose, and lignin) in bleached pulp and steam consumption in our previous study. 20 The above research results will be the basis for the establishment of models between the operating conditions and AOX emission as well as pulp quality indices. Then, an optimization model for minimizing AOX emission can be constructed.…”

Section: Introductionmentioning

confidence: 98%

“…The variables that affect AOX and pulp quality have been the subject of numerous studies. Pulp quality is typically measured by brightness, the Kappa number, and viscosity. , We also studied the effects of operating conditions on the three components (cellulose, hemicellulose, and lignin) in bleached pulp and steam consumption in our previous study . The above research results will be the basis for the establishment of models between the operating conditions and AOX emission as well as pulp quality indices.…”

Section: Introductionmentioning

confidence: 98%

Optimizing Bleaching Operating Conditions Based on Mathematical Programming to Reduce AOX Emissions

Yin

Chen

Ma³

et al. 2022

ACS Omega

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This study describes the optimization of a eucalyptus elemental chlorine-free (ECF) bleach plant to reduce adsorbable organic halogen (AOX). The correlations between operating conditions of each stage and pulp quality indices as well as the AOX content in wastewater are analyzed, taking an ECF bleaching technology (D0EpPD1) as an example. The calculation models of pulp quality indices and AOX content in wastewater are established. Then, an optimization model aiming at minimizing AOX emission is structured. The model shows a good simulation effect because the errors between the calculated and experimental values are within 6.3%. By analyzing the impact of various operating conditions on AOX emissions, it was found that chlorine dioxide reduced in the D0 stage has the greatest impact on AOX. The optimization results show that AOX can be reduced from 90.84 to 79.58 kg/h, a decrease of 12.5%. The verification experiment results based on the optimized operating conditions showed that the experimental results are in good agreement with the calculated results of the optimization model, and the effect of reducing AOX based on the optimization model is obvious.

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Effect of eucalyptus globulus pulp properties on fock reactivity

Cunha,

Simões

2024

Cellulose

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Dissolving-grade pulps serve as the primary material for producing regenerated cellulose fibers, and their utilization is steadily increasing. Despite extensive research efforts, it remains necessary to deepen our understanding of the inherent factors that impact pulp reactivity apart from the well-known degree of polymerization. The Fock reactivity test is commonly used to quantify the reactivity of cellulose pulp by measuring the percentage of cellulose that reacts with carbon disulfide. Dissolving pulps typically require a reactivity of over 90%. Hemicellulose content, intrinsic viscosity, cell wall porosity, crystallinity, and accessible area of four different pulps were characterized and distinct treatments were employed to try to separate the effect of different pulp properties and assess their effect on Fock reactivity. Hemicelluloses removal by xylanase and cold caustic treatments (86% removal) increased the Fock reactivity by 30%, from 55.7% to 71.3%. Assuming the hemicelluloses are fully accessible by the CS2, cellulose reactivity increased from 35.6% to 69.5%,but at the expense of an intrinsic viscosity decrease from 990 cm3/g to 689 cm3/g. This unexpected intrinsic viscosity decrease can be due to the cellulose de-shielding effect provoked by hemicellulose removal and some cellulose degradation during cold caustic extraction. Vibrational impact ball-milling applied on a pulp with 5% hemicellulose content notably boosted Fock reactivity by 56%, from 54% to 84.5%, but two pulp properties, intrinsic viscosity, and crystallinity, decreased concurrently due to the high-energy treatment. This phenomenon complicates identifying a direct correlation between heightened reactivity and a single parameter. To address this, endoglucanase treatment was used to separate intrinsic viscosity from crystallinity, clarifying their contributions to changes in Fock reactivity. Unfortunately, the effect of a given physical or bio/chemical pulp treatment affects more than one pulp property, always including the cellulose degree of polymerization, which has made it difficult to isolate the pulp properties that affect Fock reactivity. Several processes have been tested to obtain pulp with dissolving potential.

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Prediction models of pulp components based on the quality indices in bleaching process

Cited by 5 publications

References 15 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

Optimizing Bleaching Operating Conditions Based on Mathematical Programming to Reduce AOX Emissions

Effect of eucalyptus globulus pulp properties on fock reactivity

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