Effect of Industrial Grade MgO with Different Particle Sizes on the Bleaching of Poplar Chemi-Thermomechanical Pulp

Zhang, Junhua; Liu, Wei; Han, Song; Hou, Qingxi; Li, Yang; Wang, Yan; Long, Zhaoxia

doi:10.1021/ie400140z

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Poplar wood chips were impregnated with sodium hydroxide solution (8%, w / v ) for 2 h at 100 °C and then separated into fibers by a split corotating twin-screw extruder to obtain a chemithermomechanical pulp (CTMP) [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

Preparation of Molded Fiber Products from Hydroxylated Lignin Compounded with Lewis Acid-Modified Fibers Its Analysis

et al. 2021

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In this study, molded fiber products (MFPs) were prepared from lignin compounded with Lewis acid-modified fibers using enzymatic hydrolysis lignin (EHL) as a bio-phenol. The fibers were modified and compounded entirely through hot-pressing. To improve the reactivity of enzymatic lignin, hydroxylated enzymatic hydrolysis lignin (HEHL) was prepared by hydroxylation modification of purified EHL with hydrogen peroxide (H2O2) and ferrous hydroxide (Fe(OH)3). HEHL was mixed uniformly with Lewis acid-modified fibers on a pressure machine and modified during the molding process. The purpose of Lewis acid degradation of hemicellulose-converted furfural with HEHL was to generate a resin structure to improve the mechanical properties of a MFPs. The microstructure of the MFP was shown to be generated by resin structure, and it was demonstrated that HEHL was compounded on Lewis acid-modified fibers during the molding process. The thermal stability of the MFP with composite HEHL did not change significantly owing to the addition of lignin and had higher tensile strength (46.28 MPa) and flexural strength (65.26 MPa) compared to uncompounded and modified MFP. The results of this study are expected to promote the application of high lignin content fibers in molded fibers.

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Section: Methodsmentioning

confidence: 99%

Preparation of Molded Fiber Products from Hydroxylated Lignin Compounded with Lewis Acid-Modified Fibers Its Analysis

et al. 2021

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“…Peroxide Bleaching. The bleaching were applied by following the previously reported methods [21]. 40 g of oven-dried poplar CTMP; 3.5% total alkali charge (on NaOH) of which 50% of NaOH was replaced with industrial grade MgO (molar ratio); 0.3% DTPA; 2.0% Na 2 SiO 3 ; 6.0% H 2 O 2 ; 20% pulp consistency; at 80°C for 90 min.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Pretreatments for Removing Metal Ions from Industrial Grade Magnesium and Its Application during the Alkaline H2O2 Bleaching Process of Poplar Chemi-thermomechanical Pulp (CTMP)

Xu¹,

Liu²

2015

Proceedings of the 2015 2nd International Workshop on Materials Engineering and Computer Sciences

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The objective of this work is to evaluate the effect of applying industrial grade MgO with different grades of metal impurity partially substituting NaOH as the alkali source on the hydrogen peroxide bleaching process. In this study, the effects of pretreatments, such as washing in deionized water, washing in deionized water combined with chelating by EDTA, grinding by grinding machine, and grinding by grinding machine combined with chelating by EDTA pretreatments, on the removing of metal impurity from the industrial grade MgO were investigated. The residual H 2 O 2 of bleaching effluent and the bleached pulp properties were determined. The results showed that pretreatments had positive effects on the removal of metal ions from industrial grade MgO, but there were no obvious effects on pulp properties. The bleached pulp applied MgO that was pretreated by washing in deionized water combined with chelating by EDTA had a similar brightness (75.91%) with control sample (75.41%), but which could cut16.73% of H 2 O 2 consumption during the bleaching.

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“…In addition, poplar is suitable for making CTMP because of its light wood color and good liquid absorbency. 15 On the basis of that mentioned above, besides preextraction of hemicelluloses, it is expected that CTMP will save the refining energy consumption as well as improve the pulp properties through autohydrolysis pretreatment. In our previous work, we studied the release of acetic acid and its effect on the dissolution of carbohydrates in autohydrolysis pretreatment of poplar and investigated the influence of the pretreatment intensity on the characteristics of autohydrolysis liquor and properties of the resultant pulp.…”

Section: Introductionmentioning

confidence: 99%

“…As the chemical compositions of wood chips are changed after autohydrolysis pretreatment, the resultant CTMP would be even closer to those of the chemical pulp side, and it may find more interesting application fields (e.g., as a furnish in middle ply for paper board, where brightness is less of a concern). In addition, poplar is suitable for making CTMP because of its light wood color and good liquid absorbency . On the basis of that mentioned above, besides preextraction of hemicelluloses, it is expected that CTMP will save the refining energy consumption as well as improve the pulp properties through autohydrolysis pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Achieving Refining Energy Savings and Pulp Properties for Poplar Chemithermomechanical Pulp Improvement through Optimized Autohydrolysis Pretreatment

Hou

Liu

et al. 2014

Ind. Eng. Chem. Res.

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Pretreatment of biomass is expected to improve the pulp properties and facilitate the main components in the raw materials to be better used. In this work, the refining energy consumption and properties of the poplar chemithermomechanical pulp (CTMP) from different autohydrolysis pretreatment intensities of wood chips were investigated, and the pulp bleaching ability was also studied. The results showed that the CTMP with autohydrolysis pretreatment at a severity factor of 3.47 could have a 26% energy reduction in pressurized refining, a 60% energy saving in PFI refining, and 44% and 46% increases in tensile and tear indices, respectively. Autohydrolysis pretreatment prior to pulping could result in CTMP with a higher water retention value, higher fines content, better strength properties, lower shives content, and lower bulk and ISO brightness after PFI refining. The brightness of CTMP can be improved by alkaline peroxide bleaching.

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Effect of Industrial Grade MgO with Different Particle Sizes on the Bleaching of Poplar Chemi-Thermomechanical Pulp

Cited by 5 publications

References 7 publications

Preparation of Molded Fiber Products from Hydroxylated Lignin Compounded with Lewis Acid-Modified Fibers Its Analysis

Preparation of Molded Fiber Products from Hydroxylated Lignin Compounded with Lewis Acid-Modified Fibers Its Analysis

Evaluation of Pretreatments for Removing Metal Ions from Industrial Grade Magnesium and Its Application during the Alkaline H2O2 Bleaching Process of Poplar Chemi-thermomechanical Pulp (CTMP)

Achieving Refining Energy Savings and Pulp Properties for Poplar Chemithermomechanical Pulp Improvement through Optimized Autohydrolysis Pretreatment

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