Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Hongzheng Zhu,Zhiqian Qin,Kun Chen,Wenliang Zhu,Qinghui Shi,Ming Yang,Chao Li,Yong Zhang
Understanding the collision between kerosene droplets and coal particles in the bubble trailing vortex region is crucial for enhancing slurry conditioning. We found the area of the bubble trailing vortex region increased as the bubble size increased via the Fluent 6.3.26 software. A kerosene droplet velocity range of 0.074–0.106 m/s and a coal particle velocity range of 0.062–0.104 m/s were obtained if a bubble had a diameter of 0.3 mm. We employed a high-speed motion acquisition system and observed the collision process, which was divided into two stages: Compression and Rebound . The critical motion distance increased as the kerosene droplet size increased, and sufficient kerosene droplet motion distance and enough kinetic energy normally resulted in a rebound phenomenon. The attenuation energy was almost positively linear to the initial energy, and the energy attenuation coefficient of the collision process was fitted to 0.626. Our results can provide valuable insight into mineral separation.
研究领域:
矿物加工工程
·
流体力学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Yi Xiang,Zhen Zhao,Fuyan Gao,Zhenghui Zhao,Hang Li,Eric J. Hu,Ruikun Wang
Direct preparation of coal–water slurry using coal chemical wastewater represents an economical and feasible approach for wastewater resource utilization. Unlike clean water, however, the complex organic components in wastewater may exert adverse effects on slurry properties. To explore the mechanism underlying the influence of organic components in coal chemical wastewater on the adsorption characteristics of additives onto coal surfaces, address the issue of slurry property variations arising from slurry preparation with different wastewaters, and verify the technical and economic feasibility of wastewater-based coal–water slurry preparation, this study integrated isothermal adsorption experiments with molecular dynamics (MD) simulations. With deionized water as the control group, the study systematically analyzed the effects of four typical organic pollutants, namely, quinoline, phenol, acetic acid, and 5-hydroxymethylfurfural (5-HMF), on the “coal-additive” adsorption system, while comparing the economic performance of preparation strategies in the context of coal–water slurry production lines. The results demonstrated that the Langmuir model (with a fitting deviation of < 6%) and Δ G 0 ads (all negative values) confirmed the spontaneous nature of the adsorption process. The order of additive adsorption capacity and system interaction energy was determined as quinoline > deionized water > acetic acid > phenol > 5-HMF, where quinoline promoted adsorption whereas the other three components exhibited inhibitory effects. MD simulations revealed that the interaction between coal and additives in deionized water was primarily dominated by van der Waals forces. Organic components reduced electrostatic repulsion but caused a more significant weakening of van der Waals forces, and monolayer adsorption was identified as the optimal microscopic configuration for additives to exert their functional effects—this conclusion was consistent with analyses of adsorption configuration, molecular density distribution, and mobility. Economic analysis indicated that when comparing the two strategies of “adjusting additive dosage” and “ozone oxidation pretreatment,” and taking into account the environmental benefits of wastewater treatment, coal–water slurry preparation using coal chemical wastewater could achieve significant positive benefits under appropriate strategies compared with the conventional method, thereby realizing a win-win scenario for both wastewater treatment and economic gains. This study clarifies the regulatory mechanism of organic components in wastewater on additive adsorption from both macro- and micro-dimensional perspectives, confirms the technical and economic feasibility of coal chemical wastewater-based coal–water slurry preparation, and provides crucial support for advancing the coordinated development of industrial wastewater resource utilization and clean production.
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Xiaoxia Ma,Huijian Guo,Yujia Sui,Yun Li,Jilin Cao
Lactide, a key raw material for polylactic acid, is prone to hydrolysis during synthesis from lactic acid using zeolite beta, reducing yield. To address this issue, zeolite beta with hydrophobic pores was synthesized by template-free method with in situ silicon source modification by tetraethoxyfluorosilane (TEFS). The effect of TEFS addition on the morphology, acidity, and wettability of the synthesized zeolite beta was investigated. The modification with F groups increases the total acid amount and the strength of strong acid sites, especially the Brønsted acid sites; simultaneously, the hydrophobicity of pores was also improved. F group–modified zeolite beta achieved a lactide yield of 84%, significantly higher than the 70% yield of unmodified zeolite beta. This enhancement could be attributed to the increase in Brønsted acid sites and the improvement of the hydrophobic pore microenvironment. This could improve the catalytic reaction activity; additionally, the rapid removal of water from near acid sites could promote the forward movement of the reaction equilibrium and inhibit the hydrolysis of lactide. This work provides a new approach to improve the hydrophobicity of the pores of zeolites as solid acid catalysts, which is beneficial to the efficient production of lactide.
研究领域:
催化化学
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材料科学
·
绿色化学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Huazhu Chen,Bojie Zhou,Yuling Zhai,Zhouhang Li,Hua Wang
Nanofluids have attracted considerable interest for enhancing heat transfer efficiency; however, poor stability remains a challenge. In this study, β-cyclodextrin (β-CD) was grafted onto TiO 2 nanoparticles using nitrogen filling and vacuum drying methods to improve the stability of nanofluids. The modified nanoparticles were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The stability and thermophysical properties of the nanofluids were evaluated in the temperature range of 20°C to 60°C. The results showed that the nitrogen filling method provided better grafting efficiency and stability, with a 36.62% reduction in settling velocity compared to the vacuum drying method. The β-TiO 2 /EG:DI nanofluid exhibited a peak thermal conductivity of 0.579 W/(m·K) at 60°C, a 12.46% increase over the pure base fluid. Thermoeconomic analysis indicated that the β-TiO 2 /EG:DI nanofluid has a maximum price-performance factor of 1.206 under laminar flow at 50°C, representing a 23.67% increase compared to the unmodified TiO 2 /EG:DI nanofluid. These findings suggest that β-TiO 2 /EG:DI nanofluid is suitable for industrial applications in the laminar flow regime.
研究领域:
纳米科技
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热力学
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材料科学
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化工工程
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能源工程
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流体力学
·
传热学
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Shuai Yan,Xin Pu,Zhiyong Qi,Xiaoran Zhang,Xiaoyu Zhou,Xin Han,Lei Ye,Xinglong Qin,Jichang Liu
m -Cresol and p -cresol cannot be effectively separated using conventional distillation because of their proximate boiling temperatures. This study investigated the adsorption separation of cresol using the short b -axis ZSM-5 synthesized via a urea-assisted method. In contrast to the ellipsoidal HZSM-5, which was approximately 1 μm in length, the thickness of the sheet-like HZSM-5 decreased to 36 nm, resulting in an increase in total cresol adsorption capacity from 76 to 122 mg/g. Applying the CLD method, an increase in the TEOS:HZSM-5 ratio from 0 to 0.83 resulted in the increase in p -cresol adsorption capacity from 69 to 106 mg/g, while m -cresol adsorption capacity dropped from 53 to 12 mg/g. The adsorption selectivity significantly rose from 1.3 to 9.7. The adsorption kinetics and isotherms demonstrated that the process was exothermic for p -cresol and endothermic for m -cresol.
研究领域:
材料化学
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物理化学
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分离科学
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催化化学
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纳米材料
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Ran Shi,Zizhao Guo,Hongyu Zhu,Fangjun Chen,Lin Lang,Chunhuan Luo,Muhammad Shahzad Khurram,Qingang Xiong
The pyrolysis kinetics of herb residues with potassium and iron addition were investigated using thermogravimetric analysis (TGA) and a four-logistic distribution activation energy model (4LG-DAEM). The model included hemicellulose, cellulose, lignin, and a pseudo-component for coke. Kinetic compensation effects and n -order mechanism functions were incorporated to better fit the catalytic pyrolysis process. Compared with conventional models, the 4LG-DAEM captured the TG curve characteristics more accurately, with R 2 values above 0.995. Fitted parameter analysis showed that potassium addition significantly reduced the activation energies of cellulose, hemicellulose, lignin, and biochar reactions, but narrowed the reaction temperature ranges. Iron addition had a smaller effect on activation energies but widened the reaction temperature range. The combination of potassium and iron had a synergistic effect, enhancing the secondary reactions of hemicellulose, cellulose, and coke more effectively than single catalysts. Potassium–iron composite catalysts notably increased the proportion of biochar secondary reactions in the total process. Additionally, the 4LG-DAEM model demonstrated strong predictive ability for the kinetics of potassium–iron catalyzed pyrolysis of various biomasses.
研究领域:
化学工程
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能源与燃料
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材料科学
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热分析
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催化
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
ShaoJie Hong,Bin Guo,XiangQian Ren,Yang Cao,XiuMin Xu,Xingfu Zhou
The practical application of conventional Ti/SnO 2 -Sb electrodes is hindered by their low oxygen evolution potential (OEP) and rapid deactivation. Rare earth doping has been proposed to enhance electrode stability and catalytic activity; however, the comparative effects of different rare earth elements (e.g., La vs. Eu) on both structural and electrochemical properties remain unclear. In this paper, the fabrication of lanthanum- and europium-doped Ti/SnO 2 -Sb (TSS) electrodes and the electrochemical degradation of methylene blue (MB) were investigated. Although both lanthanum (La) and europium (Eu) are rare earth elements with many similarities, lanthanum (La)-modified electrode exhibits distinct performance characteristics. It is indicated that the Ti/SnO 2 -Sb-La (TSSL) electrode has a comparatively better crystal phase, enhanced surface hydrophobicity, and better electrochemical performance. The TSSL electrode exhibits a higher OEP of 1.84 V than other electrodes, showing a 0.15 V increase when compared with the undoped electrode. The peak oxidation current reaches 0.82 mA/cm 2 , which provides more active sites for the catalytic reaction. It is found that the La-doped electrode has better performance in wastewater treatment; the TSSL electrode shows a 45% increase in degradation efficiency when compared with the Ti/SnO 2 -Sb-Eu (TSSE) electrode for treatment of 50 ppm MB in 25 min. Moreover, the effects of current density and the initial concentration of MB were also investigated. Considering the degradation rate and energy consumption, the optimum current density for wastewater treatment is 20 mA/cm 2 . The outcome indicated that the degradation of MB was up to 98.5% in 25 min.
研究领域:
电化学
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环境工程
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Zhiwei Shi,Xinyu Jia,Hao Chen,Yagang Zhang,Xinfu He,Anning Zhou,Mingyi Wang
Aromatics and hydrogenated aromatics constitute the primary constituents of the recycled solvent utilized in coal liquefaction. However, the presence of hydrogenated aromatics complicates the assessment of the effects of aromatic compounds during the coal liquefaction process. To eliminate the effect of hydrogenated aromatics, solvent-free experiments and experiments with specific polycyclic aromatic compounds (pyrene, fluoranthene, phenanthrene, and naphthalene) were conducted, along with utilizing density functional theory calculations. Results show that the shuttle role of naphthalene is influenced by catalyst activity. In the presence of a low-active catalyst, naphthalene acts as a shuttle agent facilitating indirect hydrogen transfer. However, with a high-active catalyst, direct transfer of hydrogen from H 2 to pyrolysis radicals occurs without involving naphthalene as an intermediary. Polycyclic aromatic compounds exhibit higher hydrogen shuttle ability (pyrene > fluoranthene > phenanthrene > naphthalene). The high hydrogen shuttle ability can be attributed to the higher reactivity in hydrogenation and lower energy barriers for hydrogen transfer. A nonradical hydrogen transfer pathway has been proposed, promoting cleavage of strong covalent bonds and enhancing the yield of asphaltene and preasphaltene. Additionally, π–π inter actions between polycyclic aromatic compounds and pyrolysis radicals have been evaluated. The interactions contribute positively to radical stability. Substances characterized by a greater number of aromatic rings display a more pronounced stabilizing effect on free radicals.
研究领域:
化学工程
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有机化学
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能源技术
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计算化学
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材料科学
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产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 17
·期 6
·e2837
·
IF 1.777
Huijun Wu,Dongmei Lv,Yunhao Nie,Tingao Jiang,Jing Li,Shuwen Gong,Hui Yan
The disadvantages of low-rank coal in the preparation of coal water slurry (CWS) are well known, but the synthesis of suitable dispersants is a promising solution. Polycarboxylate dispersant (PC) is expected to be an efficient CWS dispersant due to its flexible and controllable structure. In this study, a series of binary PC dispersants were synthesized by controlling the ratio of acrylic acid (AA) to sodium styrene sulfonate (SSS), initiator fraction, and temperature, and the optimal PC was selected based on the apparent viscosity of 72 # CWS at 100 s −1 . The properties of 72 # CWS were studied: This CWS exhibited shear-thinning behavior, >14 static stability, and >55 wt% maximum solid loading, indicating the satisfactory performance of the optimal PC. The experimental results (including adsorption tests and zeta potential measurement) and molecular dynamics simulation showed that PC was effectively adsorbed on the surface of the coal particles by a horizontal multipoint adsorption mode, mainly through the interaction between the hydrophobic groups of the PC molecule and the hydrophobic areas of the coal particles. The hydrophilicity of the coal particles was therefore improved and the stability of their hydration layer was also enhanced, which accounted for the good static stability of 72 # CWS. The amount of PC adsorption and the improved absolute zeta potential were associated with the decent properties of 72 # CWS. This study is significant for promoting the molecular design of CWS dispersants based on their adsorption behavior.
研究领域:
化学工程
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能源科学
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材料科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2021
·Vol. 16
·期 6
·e2702
·
IF 1.447
Shiyuan Xiong,Xiaole Huang,Wennian Xu,Xiaoping Guo,Shuan Liu
In previous work, the corrosion performance and anti-corrosion mechanism of galvanized steel wire embedded in vegetation-growing concrete under marine environment was highlighted. In this work, a graphene-modified epoxy coating was developed and applied to the protection of galvanized steel in vegetation-growing concrete under a marine environment. The effect of dispersed graphene on the anticorrosion performance of the epoxy coatings was evaluated. The composite coatings displayed outstanding barrier properties against H 2 O molecules compared to the pure epoxy coating. Salt spray test results revealed superior corrosion resistance offered by the prepared graphene-modified epoxy coating on galvanized steel.
研究领域:
材料科学
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腐蚀与防护
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土木工程材料
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复合材料
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环境耐久性
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 17
·期 4
·e2769
·
IF 1.777
Hao Qiu,Shanshan Jiang,Yingjie Niu,Qi Zhang,Yingping Pang,Chao Su
The electrochemical performance of solid oxide fuel cells (SOFCs) is highly reliant upon the properties of cathodes, including crystal structure, electrical conductivity, electrode thickness, and so on. Here, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) is synthesized and served as the electrode for enabling high-performance SOFCs. The effect of electrode thickness on the electrocatalytic activity is systematically investigated. The electrode thickness is adjusted in two ways. One is spray-coating and then calcining once, and the other is performing the above process twice. On the basis of symmetrical cells configuration, the oxygen reduction reaction (ORR) activity of BSCF electrode with different thickness is evaluated and analyzed by the electrochemical impedance spectroscopy (EIS) technique and distribution of relaxation time (DRT). The obtained area-specific resistances (ASRs) of electrodes on the oxygen ion conducting electrolyte Sm 0.2 Ce 0.9 O 1.90 (SDC) demonstrate the thickness-dependent electrochemical activity in ORR of BSCF electrode. With an electrode thickness of 24 μm that controlled by conducting “spray-coating and calcining” twice, the BSCF electrode displays the optimal electrochemical performance with an ASR of 0.072 Ω cm 2 in ambient air at 600°C. This strategy has allowed us to produce an electrode layer with optimal thickness, paving a new path for the design of high-performance SOFCs.
研究领域:
材料科学
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电化学
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能源材料
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固体离子学
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燃料电池技术
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Nyoman Puspa Asri,Minarni Wartiningsih,Chintya Gunarto,Antonius Jimmy Widagdo,Yohannes Somawiharja,Yustia Wulandari Mirzayanti,Jia-Ming Chern,Suryadi Ismadji
A novel, efficient, and eco-friendly sustainable process has been developed for the extraction of cellulose nanofibers (CNF) from durian rinds. The method utilizes low-molecular-weight 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) as an oxidation agent, in conjunction with sonication treatment, resulting in a significant reduction of processing time and energy consumption compared to conventional techniques. Various delignification methods and sonication times were investigated. For delignification, a sodium hydroxide solution (10%, w/v) at a biomass-to-solvent ratio of 1:30 resulted in the highest cellulose content of 82.07% in cellulose durian rind powder. In addition, the yield of durian rind-based CNF from sonication treatment was found to be as high as 96.26%. The CNF exhibited exceptional characteristics, including a diameter ranging from 8 to 50 nm and a length of several micrometers. This sustainable and environmentally friendly approach demonstrates significant potential for the valorization of agricultural waste into high-performance nanocellulose materials, contributing to the advancement of sustainable materials and applications.
研究领域:
材料科学
·
纳米技术
·
可持续工程
·
废弃物高值化
·
绿色化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）