Asia-Pacific Journal of Chemical Engineering
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2024
·
IF 1.4
Yixiang Zhang,Shilong Feng,Yuhui Jing,Junhua Bai
High expansion (Hi-Ex) foam is recommended to suppress the leakage and diffusion of cryogenic liquid due to its light weight and large volume. However, the disadvantages of low stability and high break rate under environmental conditions are all limited the further application in vapor mitigation and fire extinguishing. So that, this paper focus on the effect and mechanism of nanoparticles in stabilizing Hi-Ex foam. Three kinds of nanoparticles with different concentration were selected to evaluate the effect of foam half-life and the mechanism of particles on improving the foam stability. The results indicated that different particle concentrations can improve the foam stability to a specific extent, and the maximum improving of half-life can increase by 95.4% in the presence of the hydrophilic SiO 2 at .5 wt%. Meanwhile, the hydrophilicity, size, and morphology of the particles have a specific impact on the foam stability. The foam expansion rate first increased and then decreased. From the microscopic point of view, the bubble size gradually increases with time by two processes of ripening and coalescence and satisfied in a logarithmic distribution. While, the liquid film thickness remarkably decreases due to foam drainage without particles and the adsorption and accumulation of nanoparticles on foam lamella can provide a spatial barrier for the film thinning and the inter bubble diffusion. Finally, the microscopic interaction mechanism on improving the foam stability has been further explored and revealed in these two aspects.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2021
·Vol. 17
·期 1
·e2720
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IF 1.447
Chao Jia,Hu Shen,Yingyu Xu,Xingbang Hu,Guoqiang Yang,Zhibing Zhang
With enormous interfacial area for particle collection, microbubbles exhibit great application prospect in the mineral flotation. Under certain ionic strength, microbubbles can be produced continuously in the microbubble column without extra reagent addition. In this work, multiphase flow characteristics (Sauter mean diameter, bubble size distribution, gas holdup & interfacial area) were studied systematically with variables including the salt type, salt concentration, and operating conditions. Based on mathematical model, critical coalescence concentration was determined for each investigated salt. According to experimental results, a mathematical correlation was established between the Sauter mean diameter and ionic strength. For the formation of microbubble system, the lowest ionic strength was approximately 0.5 mol/L. Multiphase flow characteristics in the microbubble column depended highly on the ionic strength. The interfacial area and gas holdup increased by 38 times and more than 3 times respectively, with the ionic strength of Al 2 (SO 4 ) 3 rising from 0 to 1.5 mol/L. The critical coalescence concentration ranged from 0.037 mol/L (Al 2 (SO 4 ) 3 ) to 0.517 mol/L (NaCl), which correlated with the ionic strength of each salt.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2020
·Vol. 15
·期 4
·e2456
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IF 1.06
Peng Liu,Yue Wang,Zhengzhong Zhou,Haoran Yuan,Tao Zheng
Pyrolysis gas release behaviour, including hydrogen, CH 4 , CO and CO 2 from pine pyrolysis, is collected from fixed bed reactor and analyzed by gas chromatography (GC). Pyrolysis tar composition is monitored using GC coupled with a mass spectrometer (GC–MS). The gas generation mechanism of catalytic pyrolysis on alumina is elaborated. The carbon structure of char is quantitatively determined by carbon-13 nuclear magnetic resonance ( 13 C-NMR) using curve-fitting methods. The results show influence of alumina on gas fuel production is mainly embodied in absorption and catalytic effect. Steam reforming reaction to gas fuel is accelerated with alumina added during pine pyrolysis. Alumina addition accelerates the decomposition of carbonate and side chains of aromatic ring in lignin below 500°C and prolong the residence time of second pyrolysis. The CH 4 release rate reaches to peak value at 500°C during pyrolysis. The H 2 increases from 98.95 to 120.19 ml/g with mass ratio of 1/4 (alumina/pine). The CO release rate has a certain increment with the alumina added. These data are the foundation for putting forward a new direction for the reuse of organic and industrial solid wastes enriched with alumina to achieve the goal on energy regeneration.
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高影响因子
Asia-Pacific Journal of Chemical Engineering
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2016
·Vol. 12
·期 1
·110-120
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IF 0.728
Jianwei Yuan,Qianqian Li,Jie Shen,Kang Huang,Gongping Liu,Jing Zhao,Jingui Duan,Wanqin Jin
It is still a great challenge to prepare high performance mixed matrix membranes (MMMs) because of the difficulty in finely tuning the compatibility between filler and organic phases. In this work, ZIF-8 nanoparticles hydrophobically functionalized by 5, 6-dimethylbenzimidazole (DMBIM) via shell ligand exchange (SLE) reaction were incorporated into polydimethylsiloxane (PDMS) matrix to fabricate defect-free MMMs. Organic-–inorganic interface compatibility was realized because of more abundant organic ligands from DMBIM. The effects of different loadings on membrane microstructure and gas separation performance were investigated systematically. A significantly enhanced C 3 H 8 /N 2 separation performance with C 3 H 8 permeability over 2.10 × 10 4 Barrer (91 % higher than that of pure PDMS membrane) and C 3 H 8 /N 2 selectivity of 99.5 (116 % higher than that of pure PDMS membrane) were achieved. Additionally, the as-prepared membrane also exhibited excellent stability during long term operation. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2022
·Vol. 17
·期 2
·e2739
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IF 1.777
Yuan Wang,Shanshan Liu,Qirui Guo,Yidong Zhang
Conversion of biomass-derived furfural platform compound to value-added tetrahydrofurfuryl alcohol (THFL) molecule is a sustainable route, and an efficient nonnoble metallic catalyst is a key factor for this reaction. In this work, Ni@C@CNT composite as a highly effective catalyst for hydrogenation of furfural to tetrahydrofurfuryl alcohol was synthesized by one-step pyrolysis of Ni-centered metal organic framework (Ni-MOF) doping with carbon nanotube (CNT). For comparison, Ni@C catalyst derived directly from Ni-MOF was also synthesized. The characterization results show that the doping of CNT promotes high dispersion of active sites and formation of Ni 3 C phase which has Pt-like catalytic activity. Therefore, the obtained Ni@C@CNT exhibited excellent activity in furfural hydrogenation (99.1% furfural conversion and 94.7% THFL yield at 120°C, 4 h, 4-MPa initial hydrogen pressure). Ni@C@CNT also shows good stability in reuse test. Current work presents a facile method for preparation of nonnoble metallic catalysts with high efficiency.
研究领域:
化学工程
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催化材料
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2020
·Vol. 15
·期 5
·e2503
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IF 1.06
Jiapeng Fu,Chunjiang Jin,Jingru Zhang,Zhiqiang Wang,Tao Wang,Xingxing Cheng,Chunyuan Ma,Huimin Chen
Three kinds of activated coke powders (ACPs) were prepared from different coal by a one-step rapid pyrolysis activation method. Detailed pore structure and surface characteristics of the ACPs were characterized by BET specific surface area test, scanning electron microscope (SEM), and Fourier transform infrared spectrometer (FTIR). Adsorption capacity of ethyl acetate, benzene, and p -xylene onto the ACPs was tested. Results demonstrated that the ACPs had well-developed pore structures, with considerable specific surface area and pore volume. Volatile contents in the feed coal had promotion effect on the fast formation and development of the pore structure. Shengli lignite (SLC) showed the largest specific surface area and pore volume, which reached 351.07 m 2 /g and 0.1698 m 3 /g, separately. Surfaces of ACPs were rich of functional groups as carboxyl, lactone, phenolic hydroxyl (or ether), and carbonyl, the types of which kept relatively constant regardless of the change of the feed coal. ACPs presented good VOCs adsorption performance. With the most micropore structures, SLC sample presented the best adsorption capacity for ethyl acetate, benzene, and p -xylene, which is 222.23, 149.87, and 217.63 mg/g, respectively. All ACPs presented preferential VOC adsorption order of ethyl acetate > p -xylene > benzene, which suggested that ACPs presented favorable adsorption ability to VOC species of polar and large molecules.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2024
·
IF 1.4
Jiajia Zhang,Xueni Sun,Hui Shao
The lowered dispersibility of carboxylic acid polymers in the seawater system with high salt content results in reduced scale inhibition efficiency. To solve this problem, a series of carboxylic acid polymers containing ether groups were prepared by free radical polymerization using α-allyl glycerol ether (AG) and vinyl monomers containing different numbers of carboxylic acid groups (acrylic acid [AA], maleic acid [MA], itaconic acid [IA], and aconitic acid [ANA]) as raw materials, and their scale inhibition properties in artificial seawater were studied. The static test results demonstrate that IA-AG outperforms the other three polymers containing ether carboxylic acid in terms of scale inhibition performance, with CaCO 3 and CaSO 4 having scale inhibition rates of 95.16% and 98.73%, respectively. Furthermore, molecular dynamics (MD) simulation was employed to investigate the mechanism of scale inhibition by simulating the interaction between ether carboxylic acid polymers and the crystal surface. The results show that the order of binding energy between polymers and crystal faces is IA-AG > ANA-AG > MA-AG > AA-AG. The simulation results are in agreement with the experimental phenomena. The polymers can overcome their own deformation and adsorb on the crystal surfaces, thus inhibiting the growth of scale.
研究领域:
化学工程
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材料科学
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高影响因子
Asia-Pacific Journal of Chemical Engineering
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2024
·
IF 1.4
Zhonghua Xue,Yali Feng,Haoran Li,Jun Yang,Mengyao Liu,Yufeng Cui
The accumulation of magnesite tailings (MT) poses challenges such as resource wastage, land occupation, dust generation, and environmental pollution, thereby jeopardizing both physical and mental health. Urgent attention is required for the proper treatment of this solid waste material. An in-depth investigation into enhancing the flotation processes of MT is essential. A comprehensive comprehension of the surface properties of MT and its principal gangue minerals assumes paramount importance in facilitating the desilication and decalcification of MT via flotation. In this investigation, a first-principles study grounded in density functional theory was employed to scrutinize the surface properties, as well as the similarities and differences in flotability, of four minerals-quartz, magnesite, dolomite, and calcite. The findings reveal that quartz's primary cleavage plane is (1 0 1), whereas that of magnesite, dolomite, and calcite is (1 0 4). The surfaces of magnesite, dolomite, and calcite exhibit chemical similarities, with Ca atoms demonstrating higher reactivity than Mg atoms. The hydrogen bonding between dodecylamine and quartz emerges as the most robust, while adsorption energies with the three carbonate minerals exhibit minimal disparity. The ongoing focus lies on the selection and optimization tests of decalcification reagents. A moderate quantity of dodecylamine manifests a certain desilication effect. However, excessive dosage compromises selectivity. The first-principles approach offers guiding significance for elucidating the surface properties of MT and its primary vein minerals, along with investigating the adsorption mechanisms of flotation regents.
研究领域:
矿物学
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材料科学
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环境科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Xueqiang Shao,Changyu Fu,Yujing Zhang,Jinyi Chen,Jinbei Yang,Zhongliang Yao
A novel self-solidifying polymeric ionic liquid (P-[DMT-PS][PHSA]) was synthesized via phenolic condensation and applied as a recyclable acidic catalyst for biodiesel production. The catalyst demonstrated high acidity (4.68 mmol/g), excellent thermal stability, and effective catalytic performance, achieving 98.19% oleic acid conversion under optimized conditions. Notably, P-[DMT-PS][PHSA] is soluble during the esterification, allowing it to act as a homogeneous catalyst, and re-precipitates upon methanol evaporation for easy recovery. Even after 10 cycles, the catalyst maintained 97.0% oleic acid conversion, highlighting its stability and reusability. Additionally, P-[DMT-PS][PHSA] exhibits remarkable substrate adaptability, effectively catalyzing the esterification of a range of substrates. This study presents a simple and mild synthesis method for polymeric ionic liquids and showcases P-[DMT-PS][PHSA] as a promising alternative to conventional catalysts for biodiesel production.
研究领域:
化学工程
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催化科学
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能源科学
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DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2026
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IF 1.7
Shanjun Xu,Bing Xia,Penghang Yan,Deqing Kong,Dong Li
Metal corrosion causes significant economic losses and safety hazards, underscoring the urgent need for effective, environmentally friendly corrosion inhibitors. In this study, an organic–inorganic composite inhibitor, chitosan–glucose–BN (CS–GL–BN) was developed to protect Q235 mild steel in a 3.5-wt% NaCl solution. The inhibitor was synthesized by first reacting chitosan (CS) with glucose (GL) via a Schiff base reaction between the amino group of CS and the aldehyde group of GL, followed by the incorporation of hydroxylated boron nitride (OH-BN). Electrochemical measurements demonstrated an inhibition efficiency of 89.8% at 200 ppm after 72 h immersion, which was markedly higher than those of pure CS (64.3%) and the CS–GL intermediate (75.8%). The water contact angle on the steel substrate increased to 91.1°, indicating enhanced hydrophobicity, while the surface roughness was reduced to 0.694 μm (compared with 5.318 μm for bare steel). These combined surface modifications effectively hindered the penetration of corrosive agents. Molecular modeling studies further revealed that the N/O heteroatoms contributed to strong adsorption, thereby significantly blocking the access of corrosive species. This work presents a synergistic strategy in which CS is functionalized with a long-chain molecule (GL) and integrated with BN to form a hybrid corrosion inhibitor that exhibits high efficiency and improved sustainability.
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高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·Vol. 21
·期 1
·e70164
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IF 1.6
Chuanying Zhang,Junjian Li,Yangyang Li,Miao Zhang,Pengxiang Diwu,Guorui Sun
Compared with microbubbles, nanobubbles exhibit superior stability, higher specific surface area, and smaller size. These characteristics have increasingly attracted the attention of petroleum researchers. However, existing literature lacks studies on nanobubble concentration and size under harsh reservoir conditions. To address this gap, this study conducted nanoparticle tracking analysis (NTA) to evaluate nanobubble concentration and size under varying salinity levels, reservoir pressures, high temperatures, and pH conditions. The results indicate the existence of a critical salinity threshold: Above this threshold, nanobubble concentration gradually decreases, whereas at lower salinity levels, the concentration initially decreases before increasing again. The particle size generally trends downward with increasing salinity but with limited variation. Additionally, nanobubble concentration decreases as the valence state of dissolved salts increases, while particle size increases correspondingly. At 30 MPa, nanobubbles remain present, with an increase in concentration and a reduction in size compared with atmospheric pressure conditions. Temperature has almost no effect on the particle size of nanobubbles. Even at 100°C, nanobubbles will not completely disappear. Furthermore, higher pH levels correlate with increased nanobubble concentration, though the impact on particle size remains minimal. These findings provide a foundational understanding of nanobubble behavior under harsh conditions, facilitating further research into their potential applications in reservoirs.
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高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2025
·
IF 1.6
Qian Wang,Xinglin Li,Yulin Xie,Lingli Zhou,Lin Chen,Lei Gong,Zhengzhong Zhou
Starch sugars are widely used in various fields, and precise control of their molecular weight may further enhance their application value. This study developed a controllable pore-size enzyme membrane reactor (EMR) to produce starch sugars with target molecular weight. Firstly, polyimide membranes were modified with multiamino compounds to create active sites for subsequent enzyme immobilization. The sieving performance of these modified membranes was analyzed using polyethylene glycol (PEG) of different molecular weights. Next, glutaraldehyde was grafted onto the membrane surface to provide active sites for starch enzyme immobilization. By adjusting the pore size of the EMR, controlled production of starch sugars with specific molecular weights was achieved. Finally, the effects of different operating pressures and flow rates on the sugar production efficiency of the EMR were investigated. This study not only provides guidance for the controlled production of starch sugars but also offers insights into the controllable preparation of EMRs.
研究领域:
生物工程
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食品科学
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产品关联
DOI
高影响因子
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