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Atomic Layer Deposition Fabricating of Ceramic Nanofiltration Membranes for Efficient Separation of Dyes from Water

21.01.2018 | He Chen, Shanshan Wu, Xiaojuan Jia, Sen Xiong, Yong Wang, AIChE Journal, 2018

Abstract To meet the strong need for highly efficient and controllable manufacturing methods to ceramic nanofiltration (NF) membranes, we use atomic layer deposition (ALD) to prepare NF membranes by tightening ultrafiltration (UF) membranes. We confine the ALD deposition of TiO2 to the ...

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Real‐time Multi‐Variable Model Predictive Control (MPC) for Steam‐Assisted Gravity Drainage (SAGD)

21.01.2018 | Sagar N Purkayastha, Ian D. Gates, Milana Trifkovic, AIChE Journal, 2018

Abstract Thermal recovery techniques, such as Steam‐Assisted Gravity Drainage (SAGD), is used to recover the majority of the crude bitumen, in Western Canada. However, suboptimal production techniques have led to a large carbon footprint and a subsequent search for more efficient extraction ...

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Reduced power consumption in stirred vessels by means of fractal impellers

18.01.2018 | S. Başbuğ, G. Papadakis, J. C. Vassilicos, AIChE Journal, 2018

Abstract Earlier studies1,2 have shown that the power consumption of an unbaffled stirred vessel decreases significantly when the regular blades are replaced by fractal ones. In this paper, the physical explanation for this reduction is investigated using Direct Numerical Simulations at Re = ...

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Stochastic Back‐off Algorithm for Simultaneous Design, Control and Scheduling of Multi‐product Systems under Uncertainty

17.01.2018 | Robert W. Koller, Luis A. Ricardez‐Sandoval, Lorenz T. Biegler, AIChE Journal, 2018

Abstract An algorithm that employs the back‐off method to provide optimal solutions for integration of design, control, and scheduling for multi‐product systems is presented, featuring a flexibility and feasibility analysis. The algorithm employs Monte Carlo (MC) sampling to generate a large ...

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Ecosystems as Unit Operations for Local Techno‐Ecological Synergy: Integrated Process Design with Treatment Wetlands

17.01.2018 | Varsha Gopalakrishnan, Bhavik R. Bakshi, AIChE Journal, 2018

Abstract Despite the critical importance of ecological systems for sustaining all chemical and manufacturing processes, process design has kept nature outside its system boundary. Recent efforts for sustainable process design aim to reduce environmental impact, but no design method considers ...

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Highly Efficient Methane Reforming over a Low‐loading Ru/γ‐Al2O3 Catalyst in a Pd‐Ag Membrane Reactor

17.01.2018 | David S. A. Simakov, Yuriy Román‐Leshkov, AIChE Journal, 2018

Abstract Natural gas can be reformed to syngas (CH4 + H2O = CO + 3H2), at temperatures above 850 °C. Membrane catalytic reformers can provide high CH4 conversions at temperatures below 650 °C, by separating H2 from the reactive mixture. Traditional Ni‐based catalysts suffer from low activity ...

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Continuous‐Time Formulations for the Optimal Planning of Multiple Refracture Treatments in a Shale Gas Well

17.01.2018 | Diego C. Cafaro, Markus G. Drouven, Ignacio E. Grossmann, AIChE Journal, 2018

Abstract This work presents a continuous‐time optimization model for planning multiple refracture treatments over the lifespan of a shale gas well. We demonstrate that continuous‐time models can handle multiple restimulations very efficiently, increasing the net present value of the well ...

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Impact of Diversity of Morphological Characteristics and Reynolds number on Local Hemodynamics in Basilar Aneurysms

12.01.2018 | Marjan Rafat, Mahsa Dabagh, Martin Heller, James D. Rabinov, Howard A. Stone, Amanda Randles, Debra T. Auguste, AIChE Journal, 2018

Abstract Morphological and hemodynamic parameters have been suggested to affect the rupture of cerebral aneurysms, but detailed mechanisms of rupture are poorly understood. The purpose of our study is to determine criteria for predicting the risk of aneurysm rupture, which is critical for ...

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A Square‐Force Cohesion Model and its Extraction from Bulk Measurements

11.01.2018 | Peiyuan Liu, Casey Q. LaMarche, Kevin M. Kellogg, Christine M. Hrenya, AIChE Journal, 2018

Abstract Accurate modeling of interparticle forces in DEM is critical to predicting the rheology of cohesive particles. Rigorous cohesion models usually include parameters associated with particle surface roughness. However, both roughness measurement and its distillation into appropriate ...

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Globally Optimal Linear Approach to the Design of Heat Exchangers Using Threshold Fouling Modeling

11.01.2018 | Julia C. Lemos, André L. H. Costa, Miguel J. Bagajewicz, AIChE Journal, 2018

Abstract This article presents a method for the mathematical optimization of the design of heat exchangers including fouling rate modeling for the tube‐side. The description of the fouling rate in crude preheat trains of petroleum distillation units is commonly based on threshold models ...

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