Direct air capture with amino acid solvent: Operational optimization using a crossflow air‐liquid contactor
Wiley Online Library » AIChE Journal
by Keju An, Kai Li, Cheng‐Min Yang, Jamieson Brechtl, Diana Stamberga, Mingkan Zhang, Kashif Nawaz
1d ago
Abstract Direct air capture (DAC) is a negative emission technology for removing CO2 from the atmosphere to maintain the CO2 level within a reasonable range so as to address greenhouse effects. In this study, the operational optimization of lab-scale DAC has been investigated using a crossflow air-liquid contactor loaded with a three dimensionally printed Gyroid packing structure and a potassium sarcosinate solvent. The effects of various parameters, including feed air flow rate, liquid solvent flow rate, contactor geometry, and ambient temperature, are examined. The results demonstrate that t ..read more
Visit website
Kinetics guided engineering of cyclodextrin glycosyltransferase with enhanced intermolecular transglycosylation activity
Wiley Online Library » AIChE Journal
by Hanchi Chen, Lingjun Ju, Yangyang Dong, Shijie Lu, Yingling Bao, Linjiang Zhu, Xiaolong Chen
1d ago
Abstract Cyclodextrin glycosyltransferase (CGTase) catalyzes intermolecular transglycosylation through either disproportionation or cyclization-coupling pathway. Kinetics analysis reveals that the hesperidin glycosylation process catalyzed by a CGTase variant (M1) is primarily accomplished through the disproportionation pathway. The cyclization-coupling pathway exhibits a lower reaction rate and competitively consumes glycosyl donor and yield byproducts that impair disproportionation. Under the guidance of reaction kinetics, mutagenesis was targeted at residues in the −3, +1, and +2 subsites ..read more
Visit website
CO2 absorption mechanism and kinetic modeling of mixed amines with ionic liquid activation
Wiley Online Library » AIChE Journal
by Rui‐Qi Jia, Qing Wu, Liang‐Liang Zhang, Bo Zhang, Guang‐Wen Chu, Jian‐Feng Chen
1d ago
Abstract Ionic liquid (IL) can not only serve as solvents to reduce carbon capture energy consumption, but also may activate the CO2 absorption of amine solutions. Here, the absorption mechanism and kinetic modeling of IL-activated single and mixed amines were studied in wetted wall column. N-(2-aminoethyl) ethanolamine (AEEA) and N,N-diethylethanolamine (DEEA) were used as representatives to evaluate the IL activation effects on primary and tertiary amines. It was found that IL activated the reaction process of primary amine, but had no activation effect on tertiary amine. The activation ener ..read more
Visit website
Issue Information ‐ Table of Contents
Wiley Online Library » AIChE Journal
by
1d ago
AIChE Journal, Volume 70, Issue 7, July 2024 ..read more
Visit website
Integrating dynamic economic optimization and encrypted control for cyber‐resilient operation of nonlinear processes
Wiley Online Library » AIChE Journal
by Yash A. Kadakia, Fahim Abdullah, Aisha Alnajdi, Panagiotis D. Christofides
1d ago
Abstract This article proposes a two-layer framework to maximize economic performance through dynamic process economics optimization while addressing fluctuating real-world economics and enhancing cyberattack resilience via encryption in the feedback control layer for nonlinear processes. The upper layer employs a Lyapunov-based economic model predictive control scheme, receiving updated economic information for each operating period, while the lower layer utilizes an encrypted linear feedback control system. Encrypted state information is decrypted in the upper layer to determine the economic ..read more
Visit website
Process safety 4.0: Artificial intelligence or intelligence augmentation for safer process operation?
Wiley Online Library » AIChE Journal
by Rajeevan Arunthavanathan, Zaman Sajid, Md. Tanjin Amin, Yuhe Tian, Faisal Khan, Efstratios Pistikopoulos
4d ago
Abstract The growth of artificial intelligence (AI) has allowed industries to automate and improve their efficiency in operations. Especially in process industries, AI helps to develop intelligent models and tools to proactively monitor and predict equipment or system failures, minimize downtime, and optimize maintenance schedules. With the advancements in AI and its ability to perform tasks, there is a growing belief that AI may eventually replace humans. However, the absence of human involvement in operations in the process industry raises safety concerns. Therefore, AI should collaborate wi ..read more
Visit website
Physics‐informed learning of chemical reactor systems using decoupling–coupling training framework
Wiley Online Library » AIChE Journal
by Zhiyong Wu, Mingjian Li, Chang He, Bingjian Zhang, Jingzheng Ren, Haoshui Yu, Qinglin Chen
4d ago
Abstract It is known that physics-informed learning become a new learning philosophy that has been applied in many scientific domains. However, this approach often struggles to achieve optimal performance in addressing the issue of multiphysics coupling. Here, for the first time, we extend this approach to modeling chemical reactor systems. We design a new decoupling–coupling training framework, which consists of decoupling pre-training and multiphysics coupling training steps. With decoupling pre-training, the complex physical domain is decomposed into subdomains of fluid flow, heat transfer ..read more
Visit website
Phase behavior of sodium and potassium salts in their aqueous solutions: Experiment and computational thermodynamics
Wiley Online Library » AIChE Journal
by Hongwei Kang, Guoxuan Li, Zhigang Lei
4d ago
Abstract With the rapid development of the semiconductor industry, the demand for ultraclean and high-purity electronic chemicals, especially ultrapure water as a general solvent for cleaning semiconductor chips, has increased dramatically. The distillation process is a good choice for large-scale production of ultrapure water that can be used to clean semiconductor chips, but there is a lack of basic thermodynamic theory for removing ionic impurities. In this work, the temperature and vapor–liquid phase composition of sodium and potassium salts aqueous solutions at vapor–liquid equilibrium (V ..read more
Visit website
Image‐based hybrid model incorporating initial spatial distribution for mesenchymal stem cell cultivation process design
Wiley Online Library » AIChE Journal
by Keita Hirono, Yusuke Hayashi, Isuru A. Udugama, Yuto Takemoto, Ryuji Kato, Masahiro Kino‐oka, Hirokazu Sugiyama
4d ago
Abstract This work presents an image-based hybrid model incorporating the initial spatial distribution for mesenchymal stem cell (MSC) cultivation process design. First, three levels of seeding bias in static MSC cultivation were experimentally investigated, and the resulting initial distribution was quantified using phase contrast microscopy image analysis. Second, the observed spatial heterogeneity was defined as a new parameter by calculating the standard deviation of the seeded cell number fraction among numerical 8 × 8 tiles on two-dimensional plates. Third, the parameter was incorporated ..read more
Visit website
Tailoring a MOF‐based adsorbent with partitioned aliphatic pore spaces for efficient CH4 purification from natural gas
Wiley Online Library » AIChE Journal
by Kang Wang, Yao Jiang, Mingming Xu, Dongdong Zheng, Shaojun Jia, Peng Cui
4d ago
Abstract Separation of CH4 from natural gas is an essential but extremely challenging process in the petrochemical industry. Here, we tailored a MOF-based adsorbent with partitioned aliphatic pore spaces through the simultaneous incorporation of the aliphatic sites and the symmetrically matched partition agent. The resulting adsorbent demonstrates exceptional adsorption capacity for C3H8 and C2H6 compared to CH4, along with remarkably competitive adsorption selectivities for C3H8/CH4 and C2H6/CH4. Breakthrough experiments further support the excellent dynamic separation efficiency of the adsor ..read more
Visit website

Follow Wiley Online Library » AIChE Journal on FeedSpot

Continue with Google
Continue with Apple
OR