Asia-Pacific Journal of Chemical Engineering最新文献

{"title":"Influence of wettability and surface tension on bubble formation from a needle","authors":"Meng Jia,&nbsp;Mingjun Pang","doi":"10.1002/apj.3169","DOIUrl":"https://doi.org/10.1002/apj.3169","url":null,"abstract":"<p>The multiphase flow accompanied by contact line motion is a common flow phenomenon in nature and industry. When investigating the bubble formation from a needle, it is generally assumed that the contact line is fixed at the inner diameter of a needle. Namely, the influence of contact line motion on bubble formation is ignored. In this paper, the effects of wettability and surface tension on the characteristics of bubble formation were studied using volume of fluid method. The changes of bubble volume, instantaneous contact angle, contact line radius, and the motion mechanism of contact line were analyzed in detail. It is found that when surface wettability and/or surface tension are different, the motion type of contact line during bubble formation is different, and the stage of bubble formation shows a great difference too. The motion of contact line is mainly affected by the pressure inside a bubble, the adhesion force, and the hydrostatic pressure of liquid outside a bubble. The sum of all forces driving contact line to move inward or outward controls the motion type of contact line.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficiency enhancement of a combined cycle power plant by thermal integration of multiple waste heat streams with organic Rankine cycle","authors":"Razia Talib,&nbsp;Zakir Khan,&nbsp;Shahzad Khurram,&nbsp;Abrar Inayat,&nbsp;Khurram Shahzad,&nbsp;Ian A. Watson","doi":"10.1002/apj.3168","DOIUrl":"https://doi.org/10.1002/apj.3168","url":null,"abstract":"<p>The study investigated the efficiency improvement of a 9.5 MW gas engine-based combined cycle power plant utilizing multiple waste heat streams in an organic Rankine cycle. Four different waste heat sources were considered: I) boiler stack gas, II) engine jacket water, III) boiler steam, and IV) engines' exhaust gas. Besides, three different organic fluids; R245fa, R134a, and R1234ze(Z) were employed to find the best working fluid in the given operating conditions. The performance analysis of the ORC revealed that R245fa is a suitable potential fluid for cases I and II, whereas R134a performs better for cases III and IV. Integrating the ORC with the boiler stack using R245fa at 8 bar_g provided an additional 16.5% waste gas heat recovery. It increased the net electric efficiency of the existing plant by 0.7%. The jacket water heat recovery further improved the net electric efficiency by 2.1%. By integrating both streams with the ORC in the existing system, the net electrical efficiency was increased from 42.6% to 45.3%. The estimated payback period for the jacket water heat recovery scenario utilizing Chinese ORC equipment was 9.3 years. However, this period was significantly reduced to 4.6 years for general industry applications, rendering it economically viable.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pilot study on coke oven flue gas injection desulfurization using highly active modified calcium hydroxide desulfurizer","authors":"Meng Liu,&nbsp;Wenxi Ding,&nbsp;Jingyang Chang,&nbsp;Jun Wan,&nbsp;Wei Liu,&nbsp;Yufeng Duan","doi":"10.1002/apj.3170","DOIUrl":"https://doi.org/10.1002/apj.3170","url":null,"abstract":"<p>Calcium hydroxide injection desulfurization has attracted extensive attention because of its low cost and recyclable characteristics. The modified calcium hydroxide was prepared on the basis of the digestion of calcium lignosulfonate (wood calcium) aqueous solution with ethanol and used in the pilot test of flue gas injection desulfurization of the coke oven. The injection desulfurization experiment was carried out with calcium hydroxide modified by 50% ethanol and 20% ethanol+0.5% wood calcium. It was found that the injection desulfurization efficiency of the two modified calcium hydroxide was better than that of the unmodified calcium hydroxide under the same injection conditions. The desulfurization efficiency of 20% ethanol+0.5% calcium hydroxide modified by wood calcium can reach more than 93.7% under the condition of 2 and 5 times calcium to sulfur ratio. The XRF analysis of desulfurization product showed that the content of S element in unreturned desulfurization ash was only 1.28%, which increased to 4.46% after 5 times of return. BET results showed that the specific surface area of the returned desulfurization ash decreased from 35.115m²/g to 10.256m²/g and the pore volume decreased from 0.103cm³/g to 0.0433cm³/g.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel Cu2O/palygorskite composite for advanced adsorption desulfurization","authors":"Mingyan Chen,&nbsp;Wentao Wang,&nbsp;Yao Zhang,&nbsp;Dehua Zhang,&nbsp;Yucheng Liu","doi":"10.1002/apj.3166","DOIUrl":"https://doi.org/10.1002/apj.3166","url":null,"abstract":"<p>In this work, a composite material for the adsorption removal of thiophenic sulfur compounds (TSCs) was prepared by loading Cu₂O onto palygorskite using a simple and low-cost impregnation method and characterized for its structure and morphology. The addition of Cu₂O did not change palygorskite's structure, and the Cu⁺ was evenly dispersed in the palygorskite fibers. The palygorskite provided the adsorptive active centers Cu⁺ efficient surface and pore structure to increase the sulfur removal performance of palygorskite. The optimum desulfurization process conditions of the Cu₂O/palygorskite were obtained experimentally and by response surface methodology. With solid/liquid mass ratio of 1/100 and temperature of 30°C, the maximum static adsorption capacity of the Cu₂O/palygorskite in model oil, which was composed of <i>n</i>-octane and a single TSC at 400 mg S/L, showed an increase of 639% for thiophene, 543% for benzothiophene, and 563% for dibenzothiophene compared to palygorskite alone. In addition, the pseudo-second-order kinetic and Langmuir isotherm model exhibited the most fitting results for thiophene adsorbing on the composite, indicating that chemisorption on a monolayer basis plays a key role in the adsorption process. To sum up, these results suggest the composite has some potential in the field of adsorption-desulfurization materials.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of Z-type heterojunction Bi4Ti3O12/g-C3N4 with pyroelectric effect for enhanced photocatalytic performance","authors":"Ze Cheng,&nbsp;Fuxiao Zhu,&nbsp;Bihui Jin,&nbsp;Zhenhua Hou,&nbsp;Hongbin Li,&nbsp;Gongliang Zhang,&nbsp;Hongman Hou,&nbsp;Jingran Bi,&nbsp;Shuang Yan,&nbsp;Hongshun Hao","doi":"10.1002/apj.3165","DOIUrl":"https://doi.org/10.1002/apj.3165","url":null,"abstract":"<p>Photocatalytic technology has been widely studied, discussed, and tested as a feasible wastewater degradation technology. The present study demonstrated the preparation of g-C₃N₄ material using solid-state sintering method and the construction of Bi₄Ti₃O₁₂/g-C₃N₄ heterostructure via hydrothermal method. This direct contact Z-type heterojunction improves the wide bandgap of Bi₄Ti₃O₁₂ monomer, enhances its photoresponsiveness, and thus improves its photocatalytic performance. During the process of photocatalytic experiments, an environment of cold and hot fluctuations were created, and the pyroelectric effect was utilized to induce self-polarization of the material and formed an internal electric field. It improves the transport ability of electron–hole pairs and suppresses their recombination in the transport path. According to the degradation experiment results, the degradation efficiency of pyroelectric synergistic heterojunction photocatalysis reached 88.7%, which was 2.27 times that of Bi₄Ti₃O₁₂. It proves that the photocatalysis by pyroelectric synergistic heterojunction has good application prospects.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new iron recovery and dephosphorization approach from unroasted high-phosphorus oolitic hematite ore via a facile chemical beneficiation process","authors":"Minghui Gong,&nbsp;Likun Gao,&nbsp;Huixin Dai,&nbsp;Xiaosong Tian,&nbsp;Fei He,&nbsp;Mei Liu,&nbsp;Bing Rao,&nbsp;Qingsong Zhang,&nbsp;Zhaobo Yin","doi":"10.1002/apj.3159","DOIUrl":"https://doi.org/10.1002/apj.3159","url":null,"abstract":"<p>Despite the abundance of scientific reports on the treatment of oolitic hematite, it still constitutes a global challenge. The distinctive oolitic structure within the ore is regarded as the primary factor causing the difficulty in the beneficiation of oolitic hematite ore. The objective of this study is to devise an effective approach to tackle the issue of beneficiation of oolitic hematite ore, thereby facilitating the utilization of oolitic hematite ore, which is widely abundant worldwide. Based on the Pourbaix diagram (E_h-pH) of the Al-Si-H₂O system, an alkaline leaching process for eliminating impurities from unroasted oolitic hematite using NaOH solution as the leaching agent was proposed. The optimal parameters were determined as a temperature of 250°C, a NaOH concentration of 16 mol/L, a liquid-to-solid ratio of 4 mL/g, and a reaction time of approximately 2 h. Around 54% of phosphorus (P), 21% of Al₂O₃, and 61% of SiO₂ can be preliminarily removed from unroasted oolitic hematite ore. Through further dephosphorization with dilute sulfuric acid at room temperature, a high-quality Fe concentrate with 63.3% Fe, 0.04% P, and a Fe recovery rate of 96% was obtained. The alkali can be readily regenerated by adding lime to the leaching solution, and the regenerated alkali has a leaching effect comparable to that of the fresh leaching solution. The recycling and utilization of alkaline leaching agents minimize production costs to the greatest extent possible. Mechanical studies have discovered that intact oolites undergo complete dissociation under alkaline leaching, enabling the leaching solution to permeate into the particles and thereby deeply eliminate impurities. The novel method has accomplished efficient processing of oolitic hematite and a reasonable control of production costs during processing, which is significant for expanding the reserves of iron ore resources.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143187292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"KCl supported by γ-Al2O3 for selective adsorption of gaseous oxidized mercury: Preparation and adsorption mechanism","authors":"Jiangyi Tong,&nbsp;Haiyang Li,&nbsp;Rui Jin,&nbsp;Xiaoshuo Liu,&nbsp;Haitao Hu,&nbsp;Yufeng Duan,&nbsp;Xiuyuan Ma,&nbsp;Li Zhong,&nbsp;Lipeng Han","doi":"10.1002/apj.3161","DOIUrl":"https://doi.org/10.1002/apj.3161","url":null,"abstract":"<p>The separation of Hg⁰ and HgCl₂ with selective adsorbents is crucial for mercury speciation detection. KCl is commonly used but has a limited surface area, a short lifespan, and an unclear mechanism for Hg⁰/HgCl₂ adsorption. Hence, KCl supported by γ-Al₂O₃ to create a high-surface-area selective adsorbent to enhance practical performance was proposed and the selective adsorption mechanisms of Hg⁰ and HgCl₂ through experimental investigations and density functional theory (DFT) calculations were elucidated. Compared to the total breakthrough of pure KCl, that of KCl/γ-Al₂O₃ exhibits markedly selective adsorption efficacy on HgCl₂, with a nearly complete breakthrough rate on Hg⁰ at a KCl-to-γ-Al₂O₃ molar ratio of 1, attributed to their favorable porosity and dispersed active sites. The DFT results verify a weak van der Waals force between KCl and Hg⁰, indicating physisorption, while covalent bonding occurs between KCl and HgCl₂, suggesting chemisorption. High-resolution transmission electron microscopy (HRTEM) identifies two crystalline surfaces of 001 and 011 on the developed adsorbent. This clarifies three stable adsorption configurations: 001 Top-Cl, 011 Top-Cl, and 011 Cl–Cl bridge, with adsorption energies of −87.11, −110.74, and −174.91 kJ/mol, respectively. Analyses of the electronic structure and interaction region indicator (IRI) reveal that the Hg atom within HgCl₂ forms covalent bonds with unsaturated Cl atoms on the KCl surface. Additionally, integrated crystal orbital Hamilton population (ICOHP) analysis and electron transfer results demonstrate that the interaction strength of the three configurations with HgCl₂ follows the order of 011 Cl–Cl bridge &gt; 011 Top-Cl &gt; 001 Top-Cl. This matches the three different temperature peaks of 276, 231, and 120°C, respectively, in the analysis of the temperature-programmed desorption of HgCl₂ (HgCl₂-TPD). This study offers a novel insight on mercury speciation partitioning between Hg⁰ and HgCl₂.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143187293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A multianalytical approach to benzodiazepine derivatives for the corrosion protection of mild steel in HCl solutions: Electrochemical analysis, SEM/EDX, XPS, DFT, and MDS calculations","authors":"Otmane Kharbouch,&nbsp;Khadija Dahmani,&nbsp;Issam Saber,&nbsp;Marouane El-alouani,&nbsp;Nordine Errahamany,&nbsp;Fatima El hajri,&nbsp;Mouhsine Galai,&nbsp;Said Boukhris,&nbsp;Mohamed Ebn Touhami,&nbsp;Hakima Nassali,&nbsp;Abeer A. AlObaid,&nbsp;Basheer M. Al-Maswari,&nbsp;Mohammad K. Al-Sadoon","doi":"10.1002/apj.3164","DOIUrl":"https://doi.org/10.1002/apj.3164","url":null,"abstract":"<p>This study takes a detailed look at the corrosion inhibition capabilities of two benzodiazepine-derived organic compounds, 3,3-dimethyl-11-(4-nitrophenyl)-2,3,4,5,10,11-hexahydro-1H-dibenzo[b,e][1,4]diazepin-1-one (PNO) and 3,3-dimethyl-11-(2-nitrophenyl)-2,3,4,5,10,11-hexahydro-1H-dibenzo[b,e][1,4]diazepin-1-one (ONO), in a 1.0-M hydrochloric acid environment using a variety of analytical methods, including electrochemical approaches — electrochemical impedance spectroscopy (EIS) and potentio-dynamic polarization (PDP). The results show that the concentration-dependent inhibitory efficacy of PNO and ONO increases with increasing concentration. Both inhibitors exhibit mixed-type behaviour, which is confirmed by the polarization results. At the optimum concentration, the inhibition efficiencies of PNO and ONO are 92.9% (PNO) and 87.6% (ONO), respectively. The effective adsorption of these inhibitors on the metal surface was also confirmed by X-ray photoelectron spectroscopy (XPS) analysis. The existence of a barrier layer surrounding the mild steel was demonstrated using scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX), all of which were used to study the surface characterization. The most important interactions with the iron surface are achieved by inhibitors with electron-accepting properties, according to density functional theory results and molecular dynamic simulation (MDS). With encouraging prospects for industry and metal preservation, these results pave the way for promising applications for effective corrosion protection in a 1.0-M HCl environment.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143187167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CFD modeling of gas–solid flow in a two-stage jetting fluidized bed with an overflow standpipe","authors":"Zhengyu Wang,&nbsp;Teng Wang,&nbsp;Meiyu Zhou,&nbsp;Luhaibo Zhao","doi":"10.1002/apj.3163","DOIUrl":"https://doi.org/10.1002/apj.3163","url":null,"abstract":"<p>The two-fluid model–kinetic theory of granular flow (TFM–KTGF) model and the sub-grid-scale (SGS) model are used to conduct a three-dimensional numerical simulation study on the hydrodynamic characteristics of a two-stage fluidized bed with an integrated overflow pipe. Using various drag models, the gas–solid flows, bed expansions, pressure drop distributions, and equilibrium conditions in the two-stage bed are compared, and the conditions for the formation of a stable overflow in the two-stage bed are thoroughly investigated. In addition, during the simulation of the secondary distribution in the bed, the porous media model simulates the momentum loss caused by the redistribution plate to avoid the direct simulation of the redistribution plate, which requires extensive grid division work and calculation costs. This work can provide technical direction for the industrialization of one-step coal to multistage fluidized bed natural gas technology.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143187256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the flow and heat transfer characteristics of a hybrid nanofluid jet impingement microchannel heat sink with airfoil fins","authors":"Zhiguo Tang,&nbsp;Man Li,&nbsp;Yan Li,&nbsp;Jianping Cheng","doi":"10.1002/apj.3160","DOIUrl":"https://doi.org/10.1002/apj.3160","url":null,"abstract":"<p>Due to the continuously increasing power density of electronic devices, the improvement of the temperature uniformity and the reduction of the irreversible energy losses became crucial in these studies on enhanced cooling capacity of the heat sinks. In this paper, a jet impingement microchannel heat sink with airfoil fins (AF-JIMHS) is proposed. The AF-JIMHS with reversed fins arrangement has very high comprehensive heat transfer performance. The increase of the internal tangent circle radius and chord length of fin can improve the temperature uniformity of the AF-JIMHS bottom surface and reduce the irreversible energy losses, at the expense of reducing its comprehensive heat transfer performance. Although the increase of the tangent arc length of fin reduces the temperature uniformity and increases the irreversible energy losses of the AF-JIMHS, it improves the comprehensive heat transfer performance in a specific parameter range. The increase of fin height improves temperature uniformity of the AF-JIMHS, while reducing its irreversible energy losses and improving its comprehensive heat transfer performance. Compared with the AF-JIMHS with uniform height fins, the one with decreasing height fins has higher comprehensive heat transfer performance and lower irreversible energy losses. Moreover, the AF-JIMHS with increasing height fins has better temperature uniformity.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143187179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}