Showing papers in "Chemical Engineering Science in 2011"

TL;DR: In this article, metal organic framework (MOF-74) analogs have been synthesized using cobalt, magnesium, nickel, and zinc metal centers to remove ammonia, cyanogen chloride, and sulfur dioxide from air.

TL;DR: In this paper, a review of recent achievements in the synthesis of nanoparticles in microfluidic reactors is presented and compared, including continuous flow, gas-liquid segmented flow and droplet-based microreactors.

TL;DR: The large number of recent publications reviewed in this paper highlights the tremendous interest in the fundamental study and use of controlled microfluidic two-phase flows, driven by the promise of highly controlled processes and new products having controlled complexity.

TL;DR: In this paper, a comprehensive overview of gas-liquid and liquid-liquid mass transfer in microstructured ReReactors (MSR) is presented, where different dimensionless parameters used to analyze mass transfer are discussed.

TL;DR: In this paper, energy transport and chemistry are modeled in an extension of the Eulerian-Lagrangian computational particle fluid dynamics (CPFD) methodology, where an enthalpy equation describes energy transport for fluid, and provides for transfer of sensible and chemical energy between phases and within the fluid mixture.

TL;DR: In this paper, the authors provide a perspective on multiscale modeling of catalytic reactions with emphasis on mechanism development and application to complex and emergent systems, and discuss the bond-order conservation method for thermochemistry and activation energy estimation.

TL;DR: In this article, a review of the recent development in microfluidics for medical diagnostics and integrations with biosensors is presented, focusing mainly on new developments in the last 5-10 years in materials development, chip architecture and integration, different sensing modes that can be used in conjunction with microfluidity, and new applications that have emerged or have been demonstrated; it also aims to point out where future research can be directed to in these areas.

TL;DR: In this article, the authors used the changing grain size model (CGSM) to predict the evolution with time of the solid conversion and to determine the kinetic parameters of both reduction and oxidation reactions taking place in the chemical-looping combustion process using ilmenite as an oxygen carrier.

TL;DR: In this paper, a numerical study of the gas-solid flow in a gas cyclone is carried out by use of the combined discrete element method (DEM) and computational fluid dynamics (CFD) model where the motion of discrete particles phase is obtained by DEM which applies Newton's equations of motion to every individual particle and the flow of continuum fluid by the traditional CFD which solves the Navier-Stokes equations at a computational cell scale.

TL;DR: In this paper, the experimental data for vapor-liquid equilibrium of CO 2 in aqueous monoethanolamine solutions are presented for 15, 30, 45 and 60 mass% MEA and from 40 to 120°C.

TL;DR: In this article, a 3D particle filtration model for low pressures considering slip/transition/free molecular flow regime, particle-fiber interactions, air/particle slip, sieve and homogenous flow field has been performed for the polyurethane nanofiber filter prepared by electrospinning process.

TL;DR: In this paper, a novel aeration system utilizing a spiral liquid flow type microbubble generator was proposed to improve an industrial waste water treatment system, which has some advantages such as compact size, portability and fast oxygen dissolution rate.

TL;DR: In this paper, the experimental data are analyzed in terms of friction factor, laminar-to-turbulent transition, and the effect of roughness on fluid hydrodynamics for different cross-sectional geometries.

TL;DR: In this article, an integrated forward osmosis-membrane distillation (FO-MD) hybrid system has been demonstrated for the concentration of protein solutions, specifically a bovine serum albumin (BSA) solution.

TL;DR: In this paper, the authors developed a model of a fluidized bed granulator by combining the gas and particle dynamics with a simple model of particle wetting based on material tests and incorporated the collision behavior of γ-Al 2 O 3 particles into the contact model.

TL;DR: This article reviews existing methods for the isolation, fractionation, or capture of rare cells in microfluidic devices and highlights the electrokinetic and non-electrokinetic methods that can potentially be combined to improve performance in future studies.

TL;DR: In this paper, the authors used experimental residence time distribution (RTD) measurements to determine the contributions of feeding variability, powder segregation and RTD variability on output composition variance and developed a predictive model of the output variance of a continuous mixer.

TL;DR: In this article, a coupled simulation approach of discrete element method (DEM) and computational fluid dynamics (CFD) has been successfully developed to study the gas-solid flow and heat transfer in fluidization at a particle scale.

TL;DR: In this article, the hydrodynamics and the pressure drop of liquid-liquid slug flow in round microcapillaries are presented, and two models, viz. the stagnant film model and the moving film model, are presented.

TL;DR: In this article, an energy minimization multi-scale (EMMS) model for gas-solid bubbling fluidized bed was proposed based on the energy-minimization multiscale method (Li and Kwauk, 1994).

TL;DR: In this paper, a 10-step one-column VPSA experiment was performed to validate the results of the multicomponent extension of the Virial isotherm and a fixed-bed mathematical model.

TL;DR: In this paper, the authors developed 3D discrete element models capable of simulating the observed flow of glass beads (simple glass spheres) and maize grains (represented as a combination of spheres) during their discharge from a small model silo.

TL;DR: In this paper, the imidazolate framework ZIF-8 samples were modified separately by using ammonia impregnation and thermal treatment in atmosphere of N 2 or H 2 in order to improve its adsorption property toward CO 2, and the modified samples A-ZIF-6, N-Zif-8 and H-6 were correspondingly available.

TL;DR: In this article, an Euler-Euler multiphase CFD model is proposed for continuous fast pyrolysis of biomass in a fluidized-bed reactor, where variable particle porosity is used to account for the evolution of the particle's physical properties, and particle kinetic processes and their interactions with the reactive gas phase are modeled with a multi-fluid description derived from the kinetic theory of granular flows.

TL;DR: The concept of novel process windows has recently been proposed by Hessel (2009) and his major processing variant, the pressurised superheated processing, is the topic of several recent reviews in the field as mentioned in this paper.

TL;DR: In this paper, the authors proposed a nonlinear fault diagnosis method based on multiscale contribution plots, where the nonlinear scores of the variables at each scale are derived, which are very useful in diagnosing faults that occur mainly at a single scale.

TL;DR: In this paper, the effect of NaOH concentration, treatment time and temperature on mechanical properties, thermal properties and crystalline structure of the PVDF hollow fibre membranes were investigated through mechanical strength measurement, surface area analysis, XRD, FTIR and DSC analyses.

TL;DR: Lau et al. as mentioned in this paper used algebraic closure relations to simulate large-scale gas/liquid contact apparatusses, such as bubble columns, which is essential for the optimization and further development of many bio-chemical and metallurgical processes.

TL;DR: Process Systems Engineering (PSE) is a relatively recent discipline as discussed by the authors which was coined about 50 years ago at the outset of the modern era of computer-aided engineering and has been widely used in chemical engineering.

TL;DR: In this paper, the effect of temperature on adsorption of CO2, CH4, CO, and N2 and separation of their binary mixtures in ZIF-8 were investigated using experimental measurements combining with molecular simulations.