Showing papers in "Chemical Engineering Science in 2014"

TL;DR: In this paper, the performance of polyamide-imide hollow fiber nanofiltration (NF) membrane in various operating conditions such as feed temperature, solute concentration, and pH was evaluated.

TL;DR: In this article, a spray-dried ZSM-5 catalyst was used in a process development unit (PDU) consisting of a bubbling fluidized bed reactor with on-stream particle input and output.

TL;DR: In this paper, a multi-step kinetic model for the pyrolysis of biomass particles, the homogeneous gas phase reactions, and the heterogeneous reactions of the residual char is presented.

TL;DR: In this paper, a coarse-grained drag force model for Euler-Lagrange (EL) based simulations of fluidized gas-particle suspensions is presented for the first time in the literature.

TL;DR: In this paper, a coarse-grained discrete particle method was proposed to describe the hydrodynamics of gas-solid flows using the energy-minimization multi-scale (EMMS) model.

TL;DR: In this paper, the potential of using CO2-rich streams was analyzed for the cultivation and harvesting of microalgae biomass, and its further transformation into biodiesel and glycerol was considered.

TL;DR: In this article, natural zeolite coated with titanium dioxide (TiO 2 ) was used as an adsorbent to rapidly remove humic acid (HA) from an aqueous solution.

TL;DR: In this article, a review of the use of direct numerical simulation (DNS) models for the study of mass, momentum and heat transfer phenomena prevailing in dense gas-solid flows is presented.

TL;DR: In this article, a mesoporous silica-supported polyethyleneimine (PEI)-silica adsorbent for CO2 capture from ambient air has been evaluated in a laboratory-scale Bubbling Fluidized Bed (BFB) reactor.

TL;DR: In this paper, the preservation ability of natural gas hydrate (NGH) with different particle sizes from 0.50mm to 30mm was investigated, and the experimental results revealed that the NGH sample was enveloped by an ice film caused by the initial rapid dissociation.

TL;DR: In this article, a liquid-liquid mass transfer between immiscible liquids using the system 1-butanol and water, with succinic acid as the mass transfer component, is presented.

TL;DR: In this paper, the authors reported an unusual behavior of hydrate formation in silica sand with gas mixtures containing propane as a co-guest, which resulted in drastic hydrate growth due to the migration of water molecules to the gas phase region.

TL;DR: The flow characteristics and rheological properties of natural gas hydrate slurry, with initial water cuts ranging from 5 to 30vol%, were investigated in a flow loop.

TL;DR: In this article, the effects of size ratio and volume fraction on the fluid flow and quantify the drag forces on binary mixtures of particles are studied by a parallel lattice Boltzmann model.

TL;DR: In this paper, a suitable silica gel-LiCl composite sorbent for the application of STES via the optimization of some key parameters, among which, the mass concentration of the impregnating solution and the pore structure of the matrix are most important.

TL;DR: In this paper, a unit cell model is proposed to study the absorption of CO2 bubbles under slug flow in a T-junction microchannel, and the amount of gas absorbed during the bubble formation process has been measured to be about 2-10% of the inlet gas phase.

TL;DR: In this paper, the authors proposed a fractional fermentation model and, based on experimental data, a non-linear fitting approach that includes fractional integration is used to obtain the fractional orders and kinetics parameters.

TL;DR: In this paper, a kinetic reaction model for thermal decomposition of urea is presented, which matches all performed thermogravimetric analyses and is also able to reproduce changes in measurement conditions, such as differences in crucibles geometry or variations of the initial sample mass.

TL;DR: In this article, the formation of the active catalyst was studied in preliminary experiments and a postulated catalytic cycle mechanistic kinetic model was developed considering isomerization, hydrogenation and hydroformylation reactions as well as formation of not catalytically active Rh-species.

TL;DR: In this article, the attainable region approach is applied to the above-mentioned alternatives for crystallization processes in order to identify attainable regions in a diagram of mean product particle size vs. total process residence time.

TL;DR: In this article, a three dimensional numerical simulation of a bubbling fluidized bed biomass gasifier has been carried out, where the fluid phase is solved by using a continuum approach and the solid is modeled by using Lagrangian computational particle model.

TL;DR: In this paper, composite binary trees are introduced for an improved kinetic Monte Carlo (kMC) calculation of chemical composition-chain length distributions (CC-CLDs) in polymerization processes, such as the bivariate copolymer composition-CLD (CoC -CLD).

TL;DR: The CFD-based compartment model proposed in this work reproduces with a good accuracy the spatial distribution of concentrations during the mixing process and this, without any adjustable parameters, is proposed.

TL;DR: In this paper, a new approach based on computational particle fluid dynamic (CPFD) method combined with electrical capacitance tomography (ECT) is used to investigate the hydrodynamic behavior of gas-solid flow in a CFB with six cyclone separators in order to improve the design and performance of a large scale CFB boiler.

TL;DR: In this paper, a liquid-liquid mass transfer mechanism with slug flow in microreactor is investigated by means of experiments in square microchannels of 0.2 and 0.3 mm width.

TL;DR: In contrast with conventional experiments for ranking the performance of kinetic hydrate inhibitors (KHIs), the high pressure automated lag time apparatus (HP-ALTA) is not limited by the stochasticity of hydrate formation because it can make large numbers of formation measurements rapidly.

TL;DR: In this paper, the spin coating technology was used to fabricate in one coating step symmetric mixed matrix membranes (MMMs) by adjusting the spinning disk velocity, rotational time, and solid concentration and volume of solution.

TL;DR: In this article, a kinetic Monte Carlo (kMC) simulation is used to model the crystal nucleation, growth, and dissolution through a fines trap in a continuous crystallization process.

TL;DR: In this article, a 3D time dependent numerical study has been performed to predict the flow hydrodynamics in bubble columns by employing explicit algebraic Reynolds stress (EARSM), re-normalization group (RNG) and RNG bubble induced turbulence (BIT) k-e models and the computational fluid dynamics (CFD) results are compared with experimental work of Deen (2001).

TL;DR: In this paper, a kinetic Monte Carlo (kMC) model is developed to simulate the crystal growth in a seeded plug flow crystallizer, which consists of five distinct segments, and the leading moments that describe the dominant dynamic behavior of the crystal volume distribution are used in the optimization-based controller to compute optimal jacket temperatures for each segment of the PFC and the optimal superficial velocity, in order to minimize the squared deviation of the average crystal size and shape from the set-points throughout the pFC.