Chinese Journal of Chemical Engineering最新文献

{"title":"A model free adaptive control method based on self-adjusting PID algorithm in pH neutralization process","authors":"Kang Liu,&nbsp;You Fan,&nbsp;Juan Chen","doi":"10.1016/j.cjche.2024.09.005","DOIUrl":"10.1016/j.cjche.2024.09.005","url":null,"abstract":"<div><div>In this paper, a new model free adaptive control method based on self-adjusting PID algorithm (MFAC-SA-PID) is proposed to solve the problem that the pH process with strong nonlinearity is difficult to control near the neutralization point. The MFAC-SA-PID method also solves the problem that the parameters of the model free adaptive control (MFAC) method are not easy to be adjusted and the effect is not obvious by introducing a fuzzy self-adjusting algorithm to adjust the controller parameters. Then the convergence and stability of the MFAC-SA-PID method are proved in this paper. In the simulation study, the control performance of the MFAC-SA-PID method proposed in this paper is compared with the traditional MFAC method and the improved model free adaptive control (IMFAC) method, respectively. The results show that the proposed MFAC-SA-PID method has better control effect on the pH neutralization process. The MFAC-SA-PID control performance also outperforms the traditional MFAC method and IMFAC method when step input disturbances are added, which indicates that the MFAC-SA-PID method has better robustness and stability.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"76 ","pages":"Pages 227-236"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ligand-tuning of coordination compound for improved oxygen evolution","authors":"Kunpeng Yang ,&nbsp;Yuanjun Liu ,&nbsp;Yuyu Liu ,&nbsp;Xingmei Guo ,&nbsp;Xiangjun Zheng ,&nbsp;Junhao Zhang ,&nbsp;Guoxing Zhu","doi":"10.1016/j.cjche.2024.07.023","DOIUrl":"10.1016/j.cjche.2024.07.023","url":null,"abstract":"<div><div>Controllable regulation of the reconstruction process for the pre-catalysts towards oxygen evolution remains as a great challenge. In this study, we report a bi-ligand strategy to facilitate the structural transformation of coordination compounds to metal oxyhydroxides during oxygen evolution with enhanced activity. A coordination compound consisting of 1,1′-ferrocene acid (Fc) and Ni²⁺ was synthesized, in which terephthalic acid was introduced. The second ligand of terephthalic acid facilitates the reconstruction process, inducing an enhanced catalytic activity. In 1 mol·L⁻¹ KOH aqueous solution, the optimized catalyst can drive a current density of 10 mA·cm^–2 under a lower overpotential of 220 mV. Using this catalyst, zinc-air batteries can be prepared. The obtained zinc-air battery presents a large specific capacity of 718 mA·h·g⁻¹ with excellent cycling stability for over 100 h far exceeding that of Pt/C+RuO₂ battery fabricated with commercial catalysts. The excellent performance and low cost of this catalyst will open up broad prospects for the development of advanced systems for water electrolysis and zinc air batteries.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"76 ","pages":"Pages 292-300"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of capacity configuration and comprehensive evaluation of a renewable energy electrolysis of water for hydrogen production system","authors":"Huairong Zhou ,&nbsp;Xin Wu ,&nbsp;Chunlei Li ,&nbsp;Siyu Yang ,&nbsp;Zhichen Chen ,&nbsp;Jun Lu ,&nbsp;Chen Fang","doi":"10.1016/j.cjche.2024.09.003","DOIUrl":"10.1016/j.cjche.2024.09.003","url":null,"abstract":"<div><div>The global green hydrogen industry is experiencing rapid growth, but the high production costs are hindering its widespread adoption. To address this challenge, it is particularly important to rationally configure a renewable energy hydrogen production system. For this purpose, the study proposes a model for capacity optimization configuration of a renewable energy hydrogen production system, which integrates wind power, photovoltaic (PV) power, and concentrating solar power (CSP) with alkaline electrolyzer. It conducts capacity optimization configuration and comprehensive evaluations of the hydrogen production system across various scenarios. To minimize the total daily consumption cost, the CPLEX solver is utilized to solve the objective function and determine the capacity configuration of the renewable energy electrolysis of water hydrogen production system generator set under various scenarios. This approach achieves a utilization rate of over 99% for renewable energy. Through comprehensive evaluation, research has found that renewable energy-coupled hydrogen production significantly reduces generator capacity and electricity generation costs compared to separate hydrogen production, enhancing the economic efficiency of the system. The Wind-PV-CSP coupling hydrogen production system has the smallest generator assembly capacity and the lowest hydrogen production cost, which is 18.84 CNY·kg⁻¹, significantly lower than the cost of PV-CSP coupling hydrogen production (25.78 CNY·kg⁻¹) and wind-PV coupling hydrogen production (25.86 CNY·kg⁻¹). It has good development prospects and plays an important role in exploring the development path of large-scale on-site consumption of new energy.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"76 ","pages":"Pages 301-317"},"PeriodicalIF":3.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 comparative techno-economic analysis for implementation of carbon dioxide to chemicals processes","authors":"Zhun Li ,&nbsp;Jinyang Zhao ,&nbsp;Ping Li ,&nbsp;Yadong Yu ,&nbsp;Chenxi Cao","doi":"10.1016/j.cjche.2024.07.013","DOIUrl":"10.1016/j.cjche.2024.07.013","url":null,"abstract":"<div><div>CO₂-based carbon-neutral organics production processes could potentially reshape the chemical industry. However, their feasibility and net carbon footprint rely strongly on the sources of H₂. Herein, we present a comprehensive comparative techno-economic analysis of CO₂-based methanol (CO₂TM) and α-olefins (CO₂TO) manufacturing using various feedstock supply modes: (1) the standalone mode with external CO₂ but H₂ from on-site water electrolysis, (2) the integrated mode with both CO₂ and H₂ recovered from coal-chemical plants, and (3) the integrated mode with recycled CO₂ but H₂ from on-site water electrolysis. The integration of CO₂TM and CO₂TO into coal-to-olefins (CTO) and coal-to-methanol (CTM) facilities is currently cost-effective and can reduce net CO₂ emissions by 65.7% and 68.5%, resulting in a three-fold and two-fold increase in carbon efficiency, respectively. As carbon tax policies and electrolysis technologies continue to evolve, standalone CO₂TM and CO₂TO are projected to become more economically competitive than CTO and CTM by 2035–2045.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 86-101"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of flexible inter-plant heat exchanger networks: A decomposition method considering intermedium fluid circles","authors":"Ran Tao ,&nbsp;Siwen Gu ,&nbsp;Linlin Liu ,&nbsp;Jian Du","doi":"10.1016/j.cjche.2024.06.024","DOIUrl":"10.1016/j.cjche.2024.06.024","url":null,"abstract":"<div><div>The traditional methods for synthesizing flexible heat exchanger networks (HENs) are not directly applicable to inter-plant HEN challenges, primarily due to the spread of system uncertainty across plants via intermedium fluid circles. This complicates the synthesis process significantly. To tackle this issue, this study proposes a decomposed stepwise methodology to facilitate the flexible synthesis of the inter-plant HENs performing indirect heat integration. A decomposition strategy is proposed to divide the overall network into manageable sub-networks by dissecting the intermedium fluid circles. To address the variability in intermedium fluid temperatures, a temperature fluctuation analysis approach is developed and a heuristic rule is introduced to maintain the temperature feasibility of the intermedium fluids. To ensure adequate flexibility and cost-effectiveness of the designed networks, flexibility analysis and network retrofit steps are conducted through model-based optimization techniques. The efficacy of the method is demonstrated through two case studies, showing its potential in achieving the desired operational flexibility for inter-plant HENs.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 62-73"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Steady-state and dynamic simulation of gas phase polyethylene process","authors":"Xiaodong Hong ,&nbsp;Wanke Chen ,&nbsp;Zuwei Liao ,&nbsp;Xiaoqiang Fan ,&nbsp;Jingyuan Sun ,&nbsp;Yao Yang ,&nbsp;Chunhui Zhao ,&nbsp;Jingdai Wang ,&nbsp;Yongrong Yang","doi":"10.1016/j.cjche.2024.07.026","DOIUrl":"10.1016/j.cjche.2024.07.026","url":null,"abstract":"<div><div>Gas-phase polyethylene (PE) processes are among the most important methods for PE production. A deeper understanding of the process characteristics and dynamic behavior, such as properties of PE and reactor stability, holds substantial interest for both academic researchers and industries. In this study, both steady-state and dynamic models for a gas-phase polyethylene process are established as a simulation platform, which can be used to study a variety of operation tasks for commercial solution polyethylene processes, such as new product development, process control and real-time optimization. The copolymerization kinetic parameters are fitted by industrial data. Additionally, a multi-reactor series model is developed to characterize the temperature distribution within the fluidized bed reactor. The accuracy in predicting melt index and density of the polymer, and the dynamic behavior of the developed models are verified by real plant data. Moreover, the dynamic simulation platform is applied to compare four practical control schemes for reactor temperature by a series of simulation experiments, since temperature control is important in industrial production. The results reveal that all four schemes effectively track the setpoint temperature. However, only the demineralized water temperature cascade control demonstrates excellent performance in handling disturbances from both the recycle gas subsystem and the heat exchange subsystem.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 110-120"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy, exergy, economic, and environmental compromising performance of dual-stage evaporation-ammonia hybrid compression–absorption refrigeration system for the cooling supply of keto-benzene dewaxing process","authors":"Shuaishuai Zhang,&nbsp;Yuanbo Liu,&nbsp;Tong Zheng,&nbsp;Da Ruan,&nbsp;Zhong Lan,&nbsp;Tingting Hao,&nbsp;Xuehu Ma","doi":"10.1016/j.cjche.2024.06.020","DOIUrl":"10.1016/j.cjche.2024.06.020","url":null,"abstract":"<div><div>Absorption refrigeration systems driven by low-temperature waste heat is one way to achieve “carbon neutrality.” Meanwhile, the keto-benzene dewaxing equipment needs a cooling capacity of 5 MW, with refrigeration temperature of −10 °C and −25 °C. This paper researches the feasibility of Dual-stage Evaporation-Ammonia Hybrid Compression–Absorption Refrigeration System (DSE-AHCARS) replacing the vapor compression refrigeration system for keto-benzene dewaxing process based on Energy, Exergy, Economic, and Environmental (4E) analysis. At the primary- and secondary-stage evaporation temperature of 0 and –23 °C, respectively, the coefficient of performance (COP) reaches the maximum value of 0.85; however, COP-electricity reaches the minimum value of 8.1. When the secondary-stage refrigeration temperature is −23 °C, CO₂ emission increases from 1150 t·a⁻¹ to 3600 t·a⁻¹, and Life Cycle Climate Performance increases from 3.29 × 10⁴ to 7.7 × 10⁴ t, with the primary-stage refrigeration temperature being −15 °C–0 °C, as well as matching three parameters to ensure the 4E compromising performance by the multi-objective optimization. To guarantee that the Life Cycle Climate Performance is less than 5.5 × 10⁴ t, the payback period is &lt;2 a, and COP is &gt;0.6 at the optimal operation ranges, such that the refrigeration temperature difference between primary stage and secondary stage is within 20 °C. The power of DSE-AHCARS was reduced by 77% compared with the vapor-compression refrigeration system. Therefore, the DSE-AHCARS can reduce CO₂ emissions by about 6250 t·a⁻¹ and save 1.2 × 10⁵ t of CO₂ in the Life Cycle Climate Performance term. This result shows that the DSE-AHCARS can completely replace the vapor-compression refrigeration system.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 274-289"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced electrochemical nitrate removal from groundwater by simply calcined Ti nanopores with modified surface characters","authors":"Yuan Meng ,&nbsp;Wanli Tan ,&nbsp;Shuang Lv ,&nbsp;Fang Liu ,&nbsp;Jindun Xu ,&nbsp;Xuejiao Ma ,&nbsp;Jia Huang","doi":"10.1016/j.cjche.2024.07.017","DOIUrl":"10.1016/j.cjche.2024.07.017","url":null,"abstract":"<div><div>A simple and convenient preparation method with high catalytic reduction activity is crucial for the remediation of nitrate contamination. In this study, the innovation for fabricating a nanoelectrode was developed by calcinating the anodized plate to alter the surface crystalline phase of the material. The prepared calcined Ti nanopores (TNPs) electrode could effectively remove up to 95.1% nitrate from simulated groundwater at 30 mA·cm^–2 electrolysis for 90 min, while under the same conditions, the removal efficiency of nanoelectrode prepared by conventional methods was merely 52.5%. Scanning electron microscopy images indicated that the calcined TNP nanoelectrode was porous with different pore sizes. The higher nitrate removal efficiency of TNPs-500 (95.1%) than TNPs-400 (77.5%) and TNPs-550 (93.4%) may resulted from the positive nonlinear response of the larger electrochemical active surface area, the improved electron transfer and suitable surface structure, and not the “anatase-to-rutile” of surface TiO₂ nanotubes. After 90 min of electrolysis, using RuO₂ as an anode and adding 0.3 g·L⁻¹ NaCl solution, 87.5% nitrate was removed, and the by-products (ammonia and nitrite) were negligible. Increased temperature and alkaline conditions can enhance the nitrate removal, while higher initial nitrate concentration only improved the nitrate removal slightly. Moreover, The TNPs-500 electrode also exhibited excellent nitrate removal performance in real groundwater with the efficiency at 82.9% and 92.1% after 90 and 120 min, which were 0.87 (removal efficiency = 95.1%), 0.92 (removal efficiency = 100%) of the efficiency for simulated groundwater, indicating the widely applicable conditions of the TNPs-500 electrode. This approach of surface-bonded elements and structure modification through calcination significantly improves catalytic activity and will guide the simple designing of functional nanostructured electrodes with wide application conditions.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 74-85"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Selective hydrogenation of dimethyl toluene-2,4-dicarbamate over supported Rh-based catalysts: Effect of support properties","authors":"Yaqi Qu,&nbsp;Xiang Li,&nbsp;Hualiang An,&nbsp;Xinqiang Zhao,&nbsp;Yanji Wang","doi":"10.1016/j.cjche.2024.07.014","DOIUrl":"10.1016/j.cjche.2024.07.014","url":null,"abstract":"<div><div>The selective hydrogenation of dimethyl toluene-2,4-dicarbamate (TDC) to methyl cyclohexyl-2,4-dicarbamate (also called hydrogenated TDC, HTDC) is an essential process for non-phosgene synthesis of methylcyclohexane-2,4-diisocyanate. Herein, we prepared a series of supported Rh-based catalysts by the excessive impregnation method and investigated their catalytic performance for the selective hydrogenation of TDC. The emphasis was put on the influence of support properties on the catalytic performance. Among the prepared catalysts, Rh/γ-Al₂O₃ performed the best: a HTDC yield of 88.4% was achieved with a 100% conversion of TDC under the conditions of 100 °C, 3 MPa and 1 h. Furthermore, Rh/γ-Al₂O₃ could be repetitively used for 4 times without a significant loss of its catalytic activity. TEM, XRD, N₂ adsorption-desorption, H₂-TPR, NH₃/CO₂-TPD, XPS and ICP characterizations were employed to distinguish the properties of the prepared catalysts and the results were correlated with their catalytic performance. It is indicated that the yield of HTDC shows a positive relevance with the percentage of moderate-to-strong acid sites and the content of Rh^<em>n</em>+ (<em>n</em> ≥ 3) in the catalysts. High values of the percentage and the content can promote a strong interaction between Rh nanoparticles and the supports, facilitating both the transfer of electrons from Rh to the support and the formation of Rh^<em>n</em>+ species. This is conducive to activating the benzene ring of TDC and thereby improving the yield of HTDC.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 102-109"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient and eco-friendly carbon dioxide capture with metal phosphate catalysts in monoethanolamine solutions","authors":"Chunjin Zhang ,&nbsp;Xue Yao ,&nbsp;Linlin Chen ,&nbsp;Hua Tang ,&nbsp;Siming Chen","doi":"10.1016/j.cjche.2024.06.023","DOIUrl":"10.1016/j.cjche.2024.06.023","url":null,"abstract":"<div><div>Catalytic carbon dioxide (CO₂) desorption has emerged as a promising approach to enhance the efficiency of CO₂ capture while minimizing energy demands, crucial for advancing chemical absorption methods. This study investigates the catalytic potential of three metal phosphates (aluminium phosphate (AlPO₄), cobaltous phosphate (Co₃(PO₄)₂), and zinc phosphate (Zn₃(PO₄)₂)) in improving the MEA (monoethanolamine) -based CO₂ absorption-desorption performance. Among the catalysts tested, AlPO₄ demonstrated superior performance, enhancing CO₂ absorption capacity by 4.2% to 9.3% and desorption capacity by 12.3% to 22.7% across five cycles. Notably, AlPO₄ increased the CO₂ desorption rate by over 104.4% at a desorption temperature of 81.3 °C, simultaneously reducing the required sensible heat by 12.3% to 22.7%, compared to processes without catalysts. The improved efficiency is attributed to AlPO₄'s ability to effectively transfer hydrogen protons from protonated MEA to carbamate, thereby facilitating the decomposition of carbamate and regenerating CO₂. This research introduces a viable, cost-effective, and eco-friendly solid acid catalyst strategy for CO₂ desorption, contributing to the development of more energy-efficient CO₂ capture technologies.</div></div>","PeriodicalId":9966,"journal":{"name":"Chinese Journal of Chemical Engineering","volume":"75 ","pages":"Pages 121-130"},"PeriodicalIF":3.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}