Korean Journal of Chemical Engineering最新文献

Dynamic Maintenance of Underground Pipelines via a Systematic Approach for Conservative Estimation of Pipeline Defect Probability Density Under Data Scarcity 在数据稀缺的情况下，通过系统方法保守估计管道缺陷概率密度，对地下管道进行动态维护

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-10-08 DOI: 10.1007/s11814-024-00297-w

Damdae Park, Changsoo Kim, Kyeongsu Kim

{"title":"Dynamic Maintenance of Underground Pipelines via a Systematic Approach for Conservative Estimation of Pipeline Defect Probability Density Under Data Scarcity","authors":"Damdae Park, Changsoo Kim, Kyeongsu Kim","doi":"10.1007/s11814-024-00297-w","DOIUrl":"10.1007/s11814-024-00297-w","url":null,"abstract":"<div>The scarcity of the defect data may lead to the underestimation of defects, resulting in maintenance plans with inspection intervals that may not guarantee timely repairs. To address the low reliability of defect distribution models developed from insufficient data, we propose a systematic approach for deriving conservative probability distributions of pipeline defects. Based on the formal definition of conservative probability distributions, we present methods for modeling such distributions for pipeline defects, with the flexibility to adjust the degree of conservativeness. Furthermore, by incorporating Bayesian inference, we introduce a method for dynamic maintenance planning. The method enables effective utilization of the limited defect data samples obtained during pipeline inspection to assess overall pipeline conditions and dynamically determine subsequent maintenance intervals. The simulation results demonstrate that the proposed method can achieve cost-effective and safety-assured pipeline maintenance plans by quantitatively adjusting the degree of conservativeness, making it broadly applicable to various types of pipeline defects.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142452968","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}

引用次数: 0

Highly Electrocatalytic Activity of Micro and Nanocomposite Phase Engineering of MoO3−x@K3PW12O40 Decorated on Graphite Felt for High-Performance VRFB 用于高性能 VRFB 的石墨毡装饰 MoO3-x@K3PW12O40 微纳米复合相工程的高电催化活性

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-10-05 DOI: 10.1007/s11814-024-00292-1

Nadra Nasir, Kue-Ho Kim, Ha-Na Jang, Hyo-Jin Ahn

{"title":"Highly Electrocatalytic Activity of Micro and Nanocomposite Phase Engineering of MoO3−x@K3PW12O40 Decorated on Graphite Felt for High-Performance VRFB","authors":"Nadra Nasir, Kue-Ho Kim, Ha-Na Jang, Hyo-Jin Ahn","doi":"10.1007/s11814-024-00292-1","DOIUrl":"10.1007/s11814-024-00292-1","url":null,"abstract":"<div>The catalytic activity of metal cations exchanged with heteropoly acids (HPA) and the selectivity towards precursor composite materials can be tailored by adjusting the reaction mechanism. A structural defect engineering strategy was developed for the metallic phase of O-MoS2, doped with a Keggin-type HPA to serve as a double gyroid layer (O-MoS2@HPA). This was achieved through thermal oxidation treatment to enable a high surface area by depositing abundant catalytically active sites on the graphite felt. Optimization strategies involving MoO3−x (MoO3−x@K3PW12O40) species have been crafted, anchoring active sites in a spherical nanomorphology through the self-assembly of acid. This development introduces a new approach for enhancing electrocatalysts, aiming for superior performance in VRFB. The electrochemical results show remarkable enhancement in electrocatalytic behavior with abundant heteroatom active sites, promoting oxidation at a high current density of 150 mA/cm2, achieving an outstanding 84.62% high energy efficiency. This result is 14% higher than pristine graphite felt and exhibits extraordinary stability after 1350 cycles, overcoming the sluggish kinetic mechanism that limits redox active materials. This study creates new avenues for the design of hybrid micro/nanostructured materials on cathodes and anodes to achieve excellent performance as electrocatalysts for VRFB.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453037","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}

引用次数: 0

Time-Lapse Traces of Transformation of CdTe Nanoparticles into Nanowires via Self-Assembly 碲化镉纳米颗粒通过自组装转化为纳米线的延时轨迹

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-25 DOI: 10.1007/s11814-024-00267-2

Jeong Won Kang, Insol Jo, Yeungchan Kim, Hyoungbum Kim, Ki-Sub Kim

{"title":"Time-Lapse Traces of Transformation of CdTe Nanoparticles into Nanowires via Self-Assembly","authors":"Jeong Won Kang, Insol Jo, Yeungchan Kim, Hyoungbum Kim, Ki-Sub Kim","doi":"10.1007/s11814-024-00267-2","DOIUrl":"10.1007/s11814-024-00267-2","url":null,"abstract":"<div>Nanostructures formed by self-assembly of semiconductor nanoparticles have unique properties that make them useful in various fields. In particular, cadmium telluride is being actively studied in the field of solar cells on the strengths of its long-term stability and low cost. In this study cadmium telluride nanoparticles were synthesized into nanowires in the dark and their evolutionary process was investigated. Thioglycolic acid was selected from among several thiol-based stabilizers. A ratio of 1.4:1 (thioglycolic acid to cadmium ion) was used rather than the traditional 2.4:1 ratio. In this study, nanowires were prepared by self-assembly of nanoparticles and the process of forming straight nanowires was observed. Synthesized nanowires were observed by using a scanning electron microscope and a transmission electron microscope, and the synthesized nanostructures were characterized. The wavelength of photoluminescence was converted from 549.9 nm to 553.3 nm as nanoparticles transformed into nanowires in an aqueous solution. The nanowire solution did not precipitate even after 60 days. The suggested synthetic procedure thus provides a viable pathway for the fabrication of nanomaterials.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453003","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}

引用次数: 0

GPT Prompt Engineering for a Large Language Model-Based Process Improvement Generation System 基于大型语言模型的流程改进生成系统的 GPT 提示工程

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-24 DOI: 10.1007/s11814-024-00276-1

Donghyeon Lee, Jaewook Lee, Dongil Shin

{"title":"GPT Prompt Engineering for a Large Language Model-Based Process Improvement Generation System","authors":"Donghyeon Lee, Jaewook Lee, Dongil Shin","doi":"10.1007/s11814-024-00276-1","DOIUrl":"10.1007/s11814-024-00276-1","url":null,"abstract":"<div>Process design improvements require extensive knowledge, considerable time, and huge human resources due to the complexity of chemical processes and their diverse objective functions. However, machine learning-based approaches using vast accumulated data are limited in low versatility, applicable only to specific processes, and unable to understand the basis of model decisions. This study proposes the GPT-based Improved Process Hybrid Transformer (GIPHT), a process design improvement generation system utilizing Large Language Model (LLM). LLMs, being natural language-based, allow for understanding the basis of model decisions without need of explainable AI analysis. GIPHT is composed of multi-agent to enhance versatility and performance for diverse chemical processes. We also propose the Detailed Simplified Flowsheet Input Line Entry System format to express process diagrams in natural language, including enhanced information about process conditions. A structured prompt system is employed and validated in the LLM domain through prompt engineering. GIPHT searches and extracts data based on its proposed improvement methodology, providing explanations for the decision-making process and the basis, overcoming limitations of the traditional black-box AI models. It offers directional ideas to design engineers in the early stages of process design and would be used for training of process engineers, supporting improvement of outdated processes and transformation into more environmentally friendly processes.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142452959","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}

引用次数: 0

Identification of Representative Wind Power Fluctuation Patterns for Water Electrolysis Device Stress Testing: A Data Mining Approach 用于水电解装置压力测试的代表性风电波动模式识别：数据挖掘方法

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-23 DOI: 10.1007/s11814-024-00286-z

Kyong Jin Choi, Sanghoon Kim, Yongchai Kwon, Min Kyu Sim

{"title":"Identification of Representative Wind Power Fluctuation Patterns for Water Electrolysis Device Stress Testing: A Data Mining Approach","authors":"Kyong Jin Choi, Sanghoon Kim, Yongchai Kwon, Min Kyu Sim","doi":"10.1007/s11814-024-00286-z","DOIUrl":"10.1007/s11814-024-00286-z","url":null,"abstract":"<div>Wind power generation is expected to greatly contribute to the future of humanity as a promising source of renewable energy. However, the high variability inherent in wind is a challenge that hinders stable power generation. To utilize wind power as a primary energy source, integration with a polymer electrolyte membrane water electrolysis (PEMWE) system is proposed. Yet, PEMWE is known to suffer from degradation when exposed to input power patterns with high variability. This poses challenges to its commercialization. This necessitates stress testing with various wind power fluctuations during the production process of the devices. This study investigates representative patterns of wind power fluctuation so that these patterns can be used for the stress testing process. We employ data-mining techniques, including the swing door algorithm and k-means clustering, to identify these patterns by analyzing wind power generation data at a 10-s interval. As a result, the five most representative wind power ramps are presented. This study provides practical guidelines for the development process of expensive devices for wind power generation, thereby promoting the active utilization of wind power generation.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142452918","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}

引用次数: 0

Design of Ionic Liquids for HF/HFC-245fa Superefficient Separation: COSMO-RS Selection and Process Assessment 设计用于 HF/HFC-245fa 超高效分离的离子液体：COSMO-RS 选择和工艺评估

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-21 DOI: 10.1007/s11814-024-00282-3

Yuan-Hao Liao, Jijun Zeng, Zhiqiang Yang, Sheng Han, Bo Zhao, Yu an, Xiaobo Tang, Tao Yu, Wei Zhang, Jian Lu

{"title":"Design of Ionic Liquids for HF/HFC-245fa Superefficient Separation: COSMO-RS Selection and Process Assessment","authors":"Yuan-Hao Liao, Jijun Zeng, Zhiqiang Yang, Sheng Han, Bo Zhao, Yu an, Xiaobo Tang, Tao Yu, Wei Zhang, Jian Lu","doi":"10.1007/s11814-024-00282-3","DOIUrl":"10.1007/s11814-024-00282-3","url":null,"abstract":"<div>Recycling hydrofluoric acid (HF) is a significant issue within the field of organofluoride chemistry. A key obstacle in this endeavor lies in the separation of azeotropic mixtures containing HF, such as the azeotropic mixture of HF and 1,1,1,3,3-pentafluoropropane (HFC-245fa), which exhibit similar boiling points. This study investigates the application of extractant distillation (ED) with ionic liquids (ILs) to achieve the separation of HF/HFC-245fa at the molecular scale, cell dimension, and systematic level (including the optimization and analysis of ED). COSMO-RS was employed to identify the suitable IL, with [Tf2N]-based ILs emerging as the most optimal extractants. Four representative [Tf2N]-based ILs were chosen based on their physical properties and thermodynamic behavior, and were applied in a continuous ED process simulation for the separation of HF/HFC-245fa using Aspen Plus, resulting in the production of 99.5 mol% HFC-245fa and 99.5 mol% HF. The determination of the optimal operational parameters was carried out through sequential quadratic programming, considering the purity requirements. An assessment of energy consumption analysis indicated that [C1Py][Tf2N] stands out as the most suitable IL for separation of HF/HFC-245fa, with heat and cooling duties of 467.82 kW and 304.80 kW, respectively. Economic analysis for the process with [C1Py][Tf2N] indicated that the annual operating costs and equipment costs are $ 5.58 × 104 and $ 3.75 × 106, respectively, of which the costs of IL are 93%, the total annual cost was comparable to that of the pressure-swing distillation process, suggesting that this ED process utilizing ILs for separating azeotropes is economically viable in terms of industrial application.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142452984","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}

引用次数: 0

Enhanced Photocatalytic Activity of Bio-Mediated Ag@Cu2O NPs Towards Fampridine: Kinetic Modelling and Mechanistic Pathways 增强生物介导的 Ag@Cu2O NPs 对氨吡啶的光催化活性：动力学模型和机理途径

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-21 DOI: 10.1007/s11814-024-00283-2

Pratibha Attri, Sangeeta Garg, Jatinder Kumar Ratan, Ardhendu Sekhar Giri

{"title":"Enhanced Photocatalytic Activity of Bio-Mediated Ag@Cu2O NPs Towards Fampridine: Kinetic Modelling and Mechanistic Pathways","authors":"Pratibha Attri, Sangeeta Garg, Jatinder Kumar Ratan, Ardhendu Sekhar Giri","doi":"10.1007/s11814-024-00283-2","DOIUrl":"10.1007/s11814-024-00283-2","url":null,"abstract":"<div>To enhance the photocatalytic activity of Cu2O NPs, Tabernaemontana divaricata leaf extract was used to synthesize Ag@Cu2O NPs. The synthesized Ag@Cu2O NPs were characterized using UV–Vis, XPS, XRD, and HR-TEM. The mechanism of Ag onto Cu2O NPs showed that the plant extract was fully saturated with flavonoids and can implant Ag onto Cu2O NPs. XPS spectra showed a shift towards lower binding energy for Cu 2p peaks from 932 to 931 eV and 952 to 951 eV, which confirmed the formation of Ag@Cu2O NPs. HR-TEM investigation indicated that the lattice distance was d = 0.25 nm which corresponds to the (111) plane of Ag, hence demonstrating the fabrication of Ag@Cu2O NPs. The degradation efficiency of fampridine was enhanced using Ag@Cu2O NPs to 95% with 97% chemical oxygen demand (COD) removal and 75% total organic carbon (TOC) conversion after 210 min of reaction time compared to Cu2O NPs. The modified first-order kinetic (MFOK) model was well fitted for the TOC conversion of fampridine, with R2 = 0.99 as compared to the first-order kinetic (FOK) model. Liquid chromatography–mass spectroscopy (LC–MS) spectra for the degradation of fampridine showed ten intermediate fragments. The synthesized Ag@Cu2O NPs also showed a high inhibition zone for the two different bacterial pathogens.</div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142452958","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}

引用次数: 0

Improving Quantum Dot Stability Against Heat and Moisture with Cyclic Olefin Copolymer Matrix 利用环烯烃共聚物基质提高量子点的耐热耐湿稳定性

IF 2.7 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-18 DOI: 10.1007/s11814-024-00278-z

Seon Hui Baek, Seung Jae Kim, Ho Seok Heo, Kangtaek Lee

{"title":"Improving Quantum Dot Stability Against Heat and Moisture with Cyclic Olefin Copolymer Matrix","authors":"Seon Hui Baek, Seung Jae Kim, Ho Seok Heo, Kangtaek Lee","doi":"10.1007/s11814-024-00278-z","DOIUrl":"https://doi.org/10.1007/s11814-024-00278-z","url":null,"abstract":"Quantum dots (QDs) are widely studied for their superior optical properties. However, maintaining their stability requires effective protection against heat and moisture. This research aims to enhance the stability of QDs by embedding them in cyclic olefin copolymer (COC). Our findings show that nanocomposites containing green- and red-emitting QDs in COC exhibited enhanced transparency and dispersion when compared to those using other common polymers, such as polydimethylsiloxane (PDMS) and poly(methyl methacrylate) (PMMA). Stability test under harsh conditions (85 °C and 85% relative humidity) confirmed the robustness of the QDs within the COC matrix compared to the PDMS and PMMA matrices. In addition, a white-light-emitting diode (LED) device was successfully fabricated by integrating a blend of green- and red-emitting QDs in COC-based nanocomposites atop a blue LED chip. This setup demonstrated potential for use in light-emitting devices that demand high luminous efficiency and transparency, even under extreme conditions. The study highlights the potential of COC as an alternative to traditional polymers, enhancing the performance and durability in display technologies.","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142250446","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}

引用次数: 0

Synthesis Strategies and Applications of Non-toxic Quantum Dots 无毒量子点的合成策略与应用

IF 2.7 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-16 DOI: 10.1007/s11814-024-00279-y

Yunmo Sung, Jaewon Chang, Sukyung Choi, Sanghwa Jeong

引用次数: 0

Mechanically Robust Transparent Conducting Electrodes for Flexible Perovskite Solar Cells 用于柔性 Perovskite 太阳能电池的机械稳健型透明导电电极

IF 2.7 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-09-14 DOI: 10.1007/s11814-024-00280-5

Unsoo Kim, Jieun Lee, Yun Seog Lee, Mansoo Choi

引用次数: 0