AIChE Journal

Publisher: American Institute of Chemical Engineers, John Wiley and Sons

Description

The AIChE Journal is the premier research monthly in chemical engineering and related fields. This peer-reviewed and broad-based journal reports on the most important and latest technological advances in core areas of chemical engineering as well as in other relevant engineering disciplines. To keep abreast with the progressive outlook of the profession, the Journal has been expanding the scope of its editorial contents to include such fast developing areas as biotechnology, electrochemical engineering, and environmental engineering.

Impact factor 2.58

  • 5-year impact
    2.54
  • Cited half-life
    0.00
  • Immediacy index
    0.61
  • Eigenfactor
    0.02
  • Article influence
    0.77
  • Website
    AIChE Journal website
  • Other titles
    AIChE journal (Online), AIChE journal, American Institute of Chemical Engineers journal
  • ISSN
    1547-5905
  • OCLC
    43667889
  • Material type
    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

John Wiley and Sons

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • See Wiley-Blackwell entry for articles after February 2007
    • On personal web site or secure external website at authors institution
    • Deposit in institutional repositories is not allowed
    • JASIST authors may deposit in an institutional repository
    • Non-commercial
    • Pre-print must be accompanied with set phrase (see individual journal copyright transfer agreements)
    • Published source must be acknowledged with set phrase (see individual journal copyright transfer agreements)
    • Publisher's version/PDF cannot be used
    • Articles in some journals can be made Open Access on payment of additional charge
    • 'John Wiley and Sons' is an imprint of 'Wiley'
  • Classification
    ​ green

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The Parex unit for industrial-scale purification of p-xylene was studied through detailed simulation and the accuracy of the developed model tested against real industrial data. Starting from a comprehensive analysis of the construction and operation of the industrial unit, a simulation model was developed that incorporates the existing three major types of dead volumes: bed lines, which connect the beds to the rotary valve, circulation lines, which connect adjacent adsorbent chambers, and bed-head dead volumes, which are located upstream of each bed due to the existence of internals. By gathering operation data and surveys in the pumparound line and in the extract stream, three case studies were defined and compared with simulation results. The model is capable of predicting the performance of the industrial unit. Further simulations were made and compared with plant data to assess the effect of adsorbent capacity loss on the long-term performance of the unit. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: Spontaneous oil percolation in french fries was studied dynamically at cellular scale using deep-UV synchrotron radiation enabling to image simultaneously the fluorescence of cell walls and of dyed oil. Experimental results report 75 oil filling kinetics of potato parenchyma cells previously emptied and equilibrated with superheated steam in conditions mimicking immersion frying. Counter-current oil-air flow was found the dominant factor controlling the kinetic of oil penetration, whereas trapped bubbles delay the passage of oil from the first to the second cell layer for additional several minutes. The frequency of occurrence of passages between layers was assessed much lower than the percolation threshold suggested by the hierarchical honeycomb arrangement of cells. A description relating microscopic oil-air flow and oil uptake is detailed in a companion paper. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: Electrostatics and hydrodynamics in the fluidized bed are mutually affected, and excess accumulation of electrostatic charges has a severe impact on hydrodynamics. However, there is a serious lack of experimental investigation of electrostatic effect on hydrodynamics. This work provides a first insight into the electrostatic effects on bubble behaviors experimentally by injecting a trace of liquid antistatic agents (LAA) into a fluidized bed. Different amounts of LAA (0~50 ppm) were injected to make the electrostatic charges vary in a wide range and the bubble behaviors were investigated simultaneously. Results showed that the charges on particles decreased with increasing amount of LAA, which resulted in larger bubble sizes, stronger fluctuations of dynamic bed height and less wall sheeting, respectively. The maximum reduction ratio of bubble sizes due to electrostatic effect was 21%. When particles were charged, the bubble sizes were significantly smaller than those estimated from the classical correlation. This discrepancy was attributed to the neglect of electrostatic effect in classical correlation. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: The thermal decomposition of 3,5-dinitro-4-methylbenzoic acid is studied by means of differential calorimetric techniques (DSC). Its autocatalytic behaviour has been highlighted and the decomposition process has been described considering the generalized expression of the Šesták-Berggren model. A new procedure for the optimization of the initiation parameter along with the other Arrhenius and kinetic exponents starting from the knowledge of the classic Šesták-Berggren model is illustrated. Encouraging results point out the validity of the approach which has been verified considering both a series of numerical and real experiments. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: Experimental results are presented for the solubility of CO2 in an aqueous solution of phenol and NaOH (molalties in water: phenol: 0.5; NaOH: 1.0) at (314, 354, and 395) K and pressures up to 10 MPa. The experimental work extends recent investigations on the influence of phenol as well as of (phenol + NaCl) on the solubility of CO2 in water. In contrast to those previous investigations the strong electrolyte reacts with carbon dioxide and also with phenol. The experimental results are compared with predictions from a thermodynamic model. That model combines a model for the “chemical” solubility of CO2 in aqueous solutions of NaOH with a model for the “physical” solubility of CO2 in aqueous solutions of phenol. An extension is introduced to account for the chemical reaction between the weak acid phenol and the strong base sodium hydroxide. The prediction results nicely agree with the new experimental data. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: A novel nonintrusive technique is presented to investigate hydrodynamic and thermal behavior of gas–solid spout-fluidized beds with liquid injection, by simultaneously capturing visual and infrared images. Experiments were performed in a pseudo-2D bed with draft plates filled with glass or γ-alumina particles to investigate the effect of liquid injection and particle properties on the flow characteristics. For the glass particles under dry and wet conditions, time-averaged particle velocities show similar quasi-steady-state behavior. However, under wet conditions, lower particle velocities were observed in both spout and annulus as compared with the dry system. Whereas, γ-alumina particles do not show considerable variation in the particle velocities under dry and wet conditions and fluidize well at higher liquid injection rates. Additionally, for the glass particles, the particle temperature significantly decreases as compared to the γ-alumina particles. © 2014 American Institute of Chemical Engineers AIChE J, 2014
    AIChE Journal 01/2015;
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    ABSTRACT: Fault detection and identification is challenged by a lack of detailed understanding of process dynamics under anomalous circumstances as well as a lack of historical data concerning rare events in a typical process. Qualitative trend analysis (QTA) techniques provide a way out by focusing on a coarse-grained representation of time series data. Such qualitative representations (QRs) are valid in a larger set of operating conditions and are thus provide a robust way to handle the detection and identification of rare events. Unfortunately, available methods fail when faced with moderate noise levels or result in rather large computational efforts. For this reason, this article provides a novel method for QTA. This leads to dramatic improvements in computational efficiency compared to the previously established shape constrained splines (SCS) method while the accuracy remains high. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: This work investigates the hidden details that are responsible for the practical success of cubic equations of state in phase equilibrium calculations. A detailed consideration of the van der Waals method for evaluating the pure compound EOS parameters sheds new light on the reasons why the elimination of the actual critical volume as parameter was also adopted in the Redlich-Kwong and the Peng-Robinson frameworks. It is shown that an interesting relationship for the critical compressibility factor arising from the Martin-Hou method opens a new door for future exploration of different frameworks. A consideration of the key steps of Soave's reasoning for determining the temperature dependence of the attractive parameter explains the larger success of the PRSV EOS over the Peng-Robinson EOSs. A reference to the extension of cubic EOS to calculate liquid densities and enthalpies and a ready to use algorithm for the evaluation of the roots of a cubic equation are included for instructional purposes. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: The implementation of a vertical dividing wall into a distillation column is a well-known concept which can result in considerable energy savings for the separation of multicomponent mixtures. It is commonly known that heat streams across the dividing wall, which are present due to temperature differences between both sides, may either increase or decrease the energy demand for a certain separation task. However, no work has been published so far which explains the maximum influence on energy demand. This paper derives the maximum extent to which the minimum energy demand for a given column design can change due to heat transfer across the dividing wall. Additionally, it is illustrated how energy-efficient column operation can be assured even if the total amount of transferred heat is unknown. These results show that the phenomenon of heat transfer across the dividing wall can be handled very well with a suitable control strategy. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: The sorption reaction CaO−CO2 was examined in a countercurrent gas−solid trickle flow reactor with regularly stacked packing at T = 500 − 600 °C, pCO2 = 40 − 50 kPa, solid-phase fluxes S = 0.3 − 0.5kg m−2s−1, and CaO particles of 500 − 710 μm in size. Sorption kinetics was evaluated by thermogravimetric (TG) technique. The random pore model was used for the description of the carbonization reaction. Hydrodynamic characteristics of gas−solid trickle flow were estimated at room temperature and ambient pressure. Plug flow model of both gas and solid-phase, with the parameters obtained from TG and hydrodynamics experiments, satisfactorily described the sorption process in countercurrent gas−solid trickle flow reactor. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: A CFD model was developed with the aim at simulating the turbulent flow field and associated dust dispersion in an agitated spherical explosion vessel. Simulations were performed in the presence of two counter-rotating fans and also after having switched-off the fans.Numerical results have shown that the dust mainly accumulates at the center of the sphere in the space left by the four vortices formed. After the switch-off of the fans, the dust particles start filling the empty volumes inside the sphere, reaching a quite uniform distribution (with concentration equal to the nominal value) and simultaneously ensuring a controlled value of turbulent kinetic energy. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: We analyze moving front dynamics of ions and holes in a planar, mixed ionic-electronic conducting polymer film. As cations invade the film, holes evacuate; thus, an ionic current is converted to an electronic signal. Recent experiments [1] show that the location of the advancing ion front increases as the square-root of time, a scaling typically associated with diffusive transport, which is surprising given the large driving voltages utilized. We model the ionic and electronic transport via the drift-diffusion equations. A similarity transformation reduces the governing partial differential equations to ordinary differential equations that are solved numerically. The similarity transformation elucidates the origin of the square-root-of-time front scaling. We compare the similarity solution to the numerical solution of the full drift-diffusion equations, finding excellent agreement. When compared to experimental data, our model captures the front location; however, qualitative differences between the ion profiles are observed. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: An intrinsic kinetics model was established for CO2 hydrogenation to dimethyl ether (DME) with a Cu–Fe–Zr/HZSM-5 catalyst based on H2/CO2 adsorption, simulation and calculation of methanol synthesis from CO2 intermediates, and experimental data. H2/CO2–temperature programmed desorption results show a dissociative H2 adsorption on Cu site; CO2 was linearly adsorbed on Fe3O4 weak base sites of the catalyst; the adsorbing capacity of H2 and CO2 increased after Zr doping. Density functional theory analysis of methanol synthesis from CO2 and H2 revealed a formate pathway. Methanol synthesis was the rate-limiting step (173.72 kJ·mol−1 activation energy) of the overall CO2 hydrogenation reaction, and formation of H2CO is the rate-determining step of methanol synthesis. Relative errors between calculated and experimental data of partial pressures of all components were less than 10%. Therefore, the kinetics model may be an accurate descriptor of intrinsic kinetics of CO2 hydrogenation to DME. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: The co-production of liquid transportation fuels and C6-C8 aromatics from the thermochemical conversion of biomass and natural gas (BGTL+C6_C8) is investigated in this paper. An optimization-based process synthesis framework incorporating multiple synthesis gas conversion technologies, such as Fischer-Tropsch synthesis or methanol conversion, is described. Production of aromatics can proceed through several technologies, such as naphtha reforming and aromatization of hydrocarbons via a metal-promoted H-ZSM-5 catalyst. This is the first paper in the literature to incorporate an aromatics complex for the co-production of liquid fuels and C6-C8 petrochemicals within a rigorous process synthesis and deterministic global optimization framework. The optimal process topologies across several case studies are discussed and the results indicate that the co-production of aromatics with liquid fuels can significantly increase the profitability of these refineries. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: Identifying anomalies in chemical processes is highly desirable. Usually, one relies on previous knowledge of normal and faulty samples, excluding anomalies from model training and associating deviations to faults. How reliable is such knowledge, however, is questionable, especially during atypical scenarios. Unsupervised approaches, using no labels, provide an unbiased analysis. A Generative Topographic Mapping (GTM) and Graph Theory combined approach, then, is proposed for unsupervised fault identification. GTM, given its probabilistic nature, highlights system features, reducing variable dimensionality. With this information, correlation between samples is calculated. Graph Theory, then, generates a network, clustering similar samples. Two anomaly cases are analyzed: an artificial data set and Tennessee Eastman Process. Principal Component Analysis (PCA) and Dynamic PCA indexes Q and T2 along GTM and Graph Theory independent monitoring methodologies are used for comparison, considering supervised and unsupervised approaches. The proposed method performed similarly to all supervised methodologies, motivating its application and developments. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: Comparison of flow development in high density downer and riser reactors is experimentally investigated using FCC particles with very high solids circulation rate up to 700 kg/m2s for the first time. Results show that both axial and radial flow structures are more uniform in downers compared to riser reactors even at very high density conditions, although the solids distribution becomes less uniform in the high density downer. Solids acceleration is much faster in the downer compared to the riser reactor indicating a shorter length of flow development and residence time, which is beneficial to the chemical reactions requiring short contact time and high product selectivity. Slip velocity in risers and downers is also firstly compared at high density conditions. The slip velocity in the downer is much smaller than in the riser for the same solids holdup indicating less particle aggregation and better gas-solids contacting in the downer reactors. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;
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    ABSTRACT: A novel mini induction heating fluidized bed reactor (IHFBR) is introduced which was developed to carry out screening tests of high temperature reactions up to 1500 °C particularly for solid feedstocks. Despite conventional mini reactors, this reactor mimics real scenario of solid feeding in industrial reactors: cold feedstock is injected within one second from a lift tube, then particles reach reaction temperature in less than 5 seconds in a reaction zone. The lift tube (9.5 cm diameter) is also gas distributor of the fluidized bed (2.5 cm diameter) so that the bed is completely fluidized with uniform gas distribution.Beside facilities to perform tests in a fluidized bed, another important feature of this reactor is prediction of the defluidization state in the bed. Not only reproducible data are generated, but also many tests can be conveniently carried out i.e. one test per hour. This article is protected by copyright. All rights reserved.
    AIChE Journal 01/2015;