CELLULOSE
·
2024
·
IF 4.9
Gan Peng,Zhang Kai,Li Jinze,Xu Qixi,Yang Guihua,Zhang Yunlai,Dong Xinchuang,Wang Baobin,Zhang Lei,Chen Jiachuan
This study focuses on using agricultural straw—specifically sugarcane bagasse—as the raw material and employs single-factor optimization and response surface modeling strategies to develop a low-temperature NACO pulping process. A mathematical prediction model was constructed to explore the leaching patterns of chemical components in sugarcane bagasse, reveal the reaction mechanism of selective lignin removal through the new oxygen-alkali synergistic approach, and elucidate the green pulping mechanism of the low-temperature NACO method. The research findings indicate that at a temperature as low as 114.3 °C and a Na 2 CO 3 / NaOH mass ratio of 1.86, the paper pulp exhibits optimal performance, with a freeness yield of 52.83%, a viscosity of 675.77 ml/g, a whiteness of 40.95% ISO, and a kappa number of 19.85. At this condition, only 43.96% of the silicon element enters the black liquor. Response surface variance analysis shows that the studied variables have statistically significant effects on different response levels, with all correlation coefficients (R 2 ) greater than 0.93, indicating that the model has good predictive capability for the low-temperature NACO pulping process. Finally, the paper produced from the pulp under the optimal conditions exhibits excellent physical properties, with a tear index of 4.9 kPa·m 2 ·g⁻ 1 , burst index of 3.8 mN·m 2 ·g⁻ 1 , tensile index of 70.9 N·m·g⁻ 1 , and ring crush index of 11.6 N·m·g⁻ 1 , which are 1.9, 1.8, 1.6, and 2.3 times, respectively, compared to the performance of paper made by traditional oxygen-alkali chemical pulping methods.
研究领域:
制浆与造纸工程
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 25
·
IF 1.768
Zhengbin Tian,Lei Zong,Rujie Niu,Xiao Wang,Yan Li,Shiyun Ai
Conversion of lignin derived from lignocellulosic biomass to bio-oil has the promising potential to significantly reduce petroleum dependence. For that purpose, it is necessary to search for a low-cost lignin source. In this study, lignin sample was separated from straw pulping black liquor by HCl-precipitation, followed by extraction with a mixture of dioxane and water. The content of lignin in the total black liquor solid reached up to 34.8%, determined by UV spectroscopy, and the yield could account for 74.4% of the total lignin composition. The structure of lignin was investigated by various spectroscopic techniques such as FTIR, 1 H-NMR, XRD, and XPS. The structural analysis revealed that recovered lignin preserved basic lignin structure, but had relatively lower amount of β-O-4 linkages. The molecular weights were studied through THF-eluted GPC showing that separated lignin had the low M n , which was favorable for the full degradation process during conversion of lignin to bio-oil. Therefore, a feasible solution for effective utilization of lignin in straw pulping black liquor as feedstock for bio-oil was proposed in the study. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42057.
研究领域:
生物质能
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Jing Li,Jia-Nan Tian,Zhao-Jun Liu,Shu-Hui Zhang,Xin-Yue Zhang,Han-Min Wang,Qing-Xi Hou
The structure of wood poses significant challenges for Chemi-thermomechanical pulp (CTMP) pulping process, particularly in achieving efficient chemical penetration and uniform distribution within woodchips. While alkali pre-impregnation is known to enhance pulp bleachability, this work advances prior work by systematically correlating lignin’s structural evolution under optimized pretreatment conditions with the bleaching performance of poplar woodchips (PWCs)-derived CTMP. The results show that the content of the main linkages, e.g. , β - O -4 and β - β , in lignin were significantly reduced 29.58 % and 21.00 %, respectively, after alkali pre-impregnation, and the number of aromatic regions including guaiacyl (G), syringyl (S) and para-coumaric acid ester (PCE) units reduced, confirming the partial depolymerization of lignin. The optimum pre-impregnation conditions, including 6 % alkali charge at 70 °C for 30 min, were beneficial to achieving a satisfied pulp brightness (74.73 % ISO). This work would highlight the critical role of alkali pre-impregnation techniques in CTMP pulping and bleaching processes.
研究领域:
林业工程
·
制浆造纸科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Heng Liu,Xiaoqian Chen,Shuzhen Ni,Zongquan Li,Na Liu,Yingjuan Fu
An effective removal of lignin could reduce the chromogenic groups of lignin in pulp. Herein, corn stover was pulped via the formic acid to investigate the effects of cooking time and temperature on the crude pulp properties. The strong hydrogen ion action of formic acid helped inhibiting both the re-polymerization of degraded lignin molecules and the subsequent adsorption on fiber. The brightness of the crude pulp could reach 51.5 %ISO with the increased lightness and decreased yellowness. The effective lignin removal reduced the residual lignocellulosic bundles in the crude pulp with the increased cooking temperature and time. The lowest lignin content of 3.5 %, α-cellulose content of 94.0 %, and Kappa number of 9.3 were obtained. Meanwhile, the lignin and monosaccharide content in the black liquor could reach 13.3 % and 28.5 %, respectively. The number-average molecular weight of lignin was as low as 818 g/mol. These were helpful to form the hydrogen bonds between fibers, thus enhancing the tensile and burst index of paper sheets. The tensile, burst and tearing indices of the corresponding crude pulp were 47.5 N·m/g, 1.42 kPa·m 2 /g and 6.53 mN·m 2 /g, respectively. This work provided valuable practical significance for studying the performance of straw pulp by high temperature formic acid cooking.
研究领域:
制浆造纸
·
生物质化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2024
·Vol. 31
·期 13
·8279-8293
·
IF 4.9
Hu Songnan,Li Peiyuan,Zhang Saisai,Huang Liulian,Chen Lihui,Hu Hui-Chao
The pulp industry, one of the oldest and largest chemical industries globally, plays a critical role in biomass utilization. Increasing kraft pulp yield has long perplexed researchers and engineers. Given that methyl mercaptan (MeSH) can be self-produced during the kraft pulping process, revisiting MeSH-assisted yield enhancement technology offers great attraction for pulp industry. MeSH’s strong nucleophilicity enables its consumption through both demethylation and non-demethylation reactions. Investigating the MeSH’s evolution at typical pulping conditions is crucial for achieving higher recovery rate of MeSH. This study found that higher pulping temperatures, increased alkali charge, and larger Na 2 S ratios improve the recyclable residual MeSH content in black liquors, increasing it from 17 to 36%. Under moderate pulping conditions, the residual MeSH content was approximately 30% of the original MeSH. Dimethyl sulfide (DMS), a valuable demethylation product of lignin or hemicellulose by MeSH, was found in black liquors at levels up to 15% of the original MeSH. Approximately half of MeSH participated in non-demethylation reactions and could not be recycled. X-ray photoelectron spectroscopy (XPS) analysis of separated kraft lignins suggested the generation pathway and chemical structure of new methylsulfur (MeS)-containing lignin. For economic balance and profitability, DMS recycling is proposed as cost compensation, or by adopting partial MeSH-assisted kraft pulping in batch digesting systems.
研究领域:
化学工程
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生物质利用
·
制浆造纸工业
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xiaohui Guo,Yingjuan Fu,Fawei Miao,Quanshui Yu,Na Liu,Fengshan Zhang
Thermal acetic acid/sodium acetate hydrolysis (ASH) on poplar wood chips were carried out to obtain functional xylooligosaccharide, then the hydrolyzed wood chips were subjected to kraft pulping (KP) to fractionate cellulose and lignin. The separated three fractions were extensively characterized for further utilization in view of the integral biorefinery concept. The extraction efficiency of hemicelluloses by ASH strongly depends on the buffer ratio of the acetic acid/sodium acetate buffer solution. The ASH facilitated producing a high ratio of xylooligosaccharides with high molecular weight, while prevented further degradation of the saccharides, and simultaneously inhibited the condensation of lignin facilitating the subsequent kraft delignification. The obtained cellulose pulps had higher intrinsic viscosities as compared with the traditional autohydrolysis-KP process. Moreover, the ASH-KP process delivered a high purity of lignin with relatively high molecular weight. Therefore, the proposed integrated fractionation strategy is conducive to convert the lignocellulosic components into bio-based functional materials.
研究领域:
林业工程
·
生物炼制
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Penghua Zhao,Jiachuan Chen,Lei Zhang,Chenglong Qiu,Baobin Wang,Jinze Li,Kai Zhang,Guihua Yang
Heteroatom-doped porous carbon has become a key material in the field of supercapacitors (SCs) and the oxygen reduction reaction (ORR). Here, eucalyptus pulping red liquor was used as the starting material for a straightforward one-step NH4Cl-assisted carbonization technique that produced a nitrogen and sulfur codoped bifunctional porous carbon material. The sulfur in sodium lignosulfonate was used as a S atom dopant. NH4Cl added to the red liquor can not only produce NaCl as a template but also as a nitrogen source. The resulting carbons possess rich hierarchical porous structures and high specific surface area (1092 m2 g–1) and ID/IG ratio (1.04), leading to remarkable electrocatalytic activity with a specific capacitance of 326 F g–1 at 0.5 A g–1 for capacitance and an identical onset and half-wave potentials of 0.988 V vs reversible hydrogen electrode (RHE) and 0.847 V vs RHE for the ORR, as compared with the benchmark Pt/C catalyst. Furthermore, when BLC-N/S-1000 was used as an electrocatalyst in an air electrode of a zinc–air battery, it showed superior long-term stability for 356 h at 5 mA cm–2 and 20 min/cycle. Results in the present work pave a new green method to convert abundant low-cost biomass into high-end heteroatom-doped carbons with rich hierarchical porous structures for electrochemical energy devices.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Fermentation-Basel
·
2024
·Vol. 10
·期 5
·247
·
IF 3.3
Jinxun Lei,Zhihong Xu,Yong Chen,Guo Yu,Zexiang Liu,Shuangfei Wang,Jian Zhang,Kelin Li,Li Xie
The lignin derivatives generated during pulping might be responsible for the suboptimal performance of anaerobic reactors during the treatment of pulping wastewater. However, the exact mechanisms by which these derivatives exert influence remain unclear. This study investigated the influence of lignin derivatives, simulated using humic acids (HAs), in anaerobic granular sludge (AnGS). Compared to the enzymes present during floc-bonding and granule-bonding, the HAs impeded the conversion of unhydrolyzed substrates into methane and caused considerable inactivation of free enzymes. Simultaneously, the HAs suppressed agglomeration and weakened the strength of the AnGS. Furthermore, calcium ions helped maintain the integrity of the sludge structure. Therefore, the inhibition of extracellular enzymes using lignin derivatives delays the methanation of unhydrolyzed substrates, resulting in a reduced biomass within AnGS reactors owing to sludge disintegration and biomass loss. This study serves as a reference for investigating the persistent risks originating from lignin derivatives associated with using anaerobic granular-sludge bed reactors to treat pulping wastewater.
研究领域:
环境工程
·
废水处理
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2025
·
IF 4.8
Li Peiyuan,Hu Songnan,Huang Suyue,Zhang Saisai,Hu Hui-Chao
Increasing kraft pulp yield has long been a critical objective in the pulp and paper industry. In recent years, methyl mercaptan (MeSH) has been recognized as an effective additive for enhancing kraft pulping yields in both softwood and hardwood. To elucidate the underlying mechanisms, this study investigates the impact of MeSH introduction on bamboo kraft pulping, with a focus on understanding its role in enhancing delignification efficiency and protecting carbohydrates. A comparative analysis on kraft lignin reveals that MeSH introduction significantly reduces lignin’s molecular weight by approximately 30%, and the phenolic hydroxyl group content drastically increases by 21.7%. That promotes the dissolution of kraft lignin in pulping liquors, thus accelerating delignification and shortening H-factor by 29.5% and lowering alkali charge by 2%. Analysis of polymerization degree (with a 56% reduction in its decrease) and reducing end group content (decreasing by 12%) in cooked dissolving pulps verifies that MeSH inhibits both carbohydrate peeling reactions and alkaline hydrolysis, and the primarily contribution is on the protective effect on cellulose (82.1%). Therefore, we believe that the main mechanism using MeSH as additives includes two aspects, i.e., accelerating delignification and preventing carbohydrate degradation, which collectively promotes the yield increase of bamboo kraft pulp by 2.8%.
研究领域:
制浆化学
·
生物质转化
·
林产化工
·
高分子降解
·
纤维素科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 6
·848
·
IF 4.7
Lanxin Xue,Guihua Yang,Zhaoyun Lin,Jinze Li,Bo He,Jiachuan Chen
Herein, wheat straw residue and pulping waste liquid were collected from pulping mill and mixed to prepare bio-based granular fuels by using compression molding technology, and to explore the comprehensive utilization of the industrial waste of pulping and papermaking. The effects of pulping waste liquid on granular fuel properties were analyzed systemically. Further study of the function of pulping waste liquid, cellulose and hemicellulose was used to replace wheat straw residue and avoid the interference factors. Therefore, the prediction models of granular fuels were established with influencing factors that included cellulose, hemicellulose and pulping waste liquid. The granular fuels had the best performance with 18.30% solid content of pulping waste liquid. The highest transverse compressive strength of granular fuel was 102.61 MPa, and the activation energy was 81.71 KJ·mol−1. A series of curve fitting prediction models were established to clarify the forming process of granular fuel, and it turned out that the pulping waste liquid could improve the adhesion between solid particles and increase their compression resistance.
研究领域:
环境科学
·
生物能源
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Shuangquan Yao,Shuangxi Nie,Yue Yuan,Shuangfei Wang,Chengrong Qin
To reduce the degradation of cellulose and obtain high molecular weight of hemicellulose from the extracts, pH pre-corrected hot water pretreatment was developed by employing sodium hydroxide (3.9 mol/L). The response surface model was established to optimize the extraction process. The species composition and purity of hemicellulose extract was analyzed by High Performance Liquid Chromatography (HPLC). The obtained solid remainder was analyzed by FTIR and SEM. The results showed that the component of xylose in hemicellulose extract was similar with commercial xylan. FTIR and SEM were shown to be able to evaluate solid remainder composition and surface characterization of the bagasse. The biggest balance between solid remainder and dissolved solid was obtained. Not only the yield of dissolved solid was improved, but the structure of solid remainder was also proved, which was beneficial to pulping and papermaking.
研究领域:
化学工程
·
材料科学
·
生物化工
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Tianle Li,Shaocong Pang,Luo Zhao,Liangliang Yan,Xiuhua Zheng,Yuxiu An
During the drilling process, the hydration and expansion of shale are one of the main reasons for wellbore instability, which can lead to stuck drilling and economic losses. A novel shale inhibitor (ADG) was successfully synthesized by thermal polymerization using Acrylamide (AM), Dimethyl diallyl ammonium chloride (DMDAAC) and Graphene as raw materials, Ammonium persulfate, and Sodium bisulfite as initiators. In order to study the structural characteristics of ADG, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Thermogravimetric loss test (TG), and Scanning electron microscopy (SEM) test were conducted. Simultaneously, linear swelling test, mud making test, sedimentation test, contact angle test, and montmorillonite (MMT) impregnation test were conducted to evaluate its inhibitory performance. ADG can reduce the expansion height of bentonite test blocks from 6.4 mm to 2.06 mm. After adding ADG, the settling speed can be effectively accelerated, with a settling time of only 15 min and a settling height as low as 60 mm. SEM analysis revealed that ADG had a regular flake-like structure. Compared to conventional shale inhibitors, ADG can increase the contact angle of bentonite test blocks from 26.8° to 46.8°, improving their hydrophobicity. Mechanistic studies suggested that ADG molecules could adsorb on the shale surface and block surface pores, reducing the contact area between shale and water. Additionally, small ADG molecules could penetrate the pore interiors and form hydrophobic films. The dual mechanism of ADG, inhibiting hydration and providing physical blockage, further demonstrated its excellent inhibitory performance.
研究领域:
材料科学
·
化学工程
·
石油工程
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）