AICHE Journal

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Semibatch reaction crystallization of benzoic acid
AICHE Journal - Tập 38 Số 3 - Trang 328-342 - 1992
Bengt L. Å Slund, Å Ke C. Rasmuson
AbstractAn experimental study of a semibatch reaction crystallization is presented. Dilute hydrochloric acid is fed to a stirred solution of sodium benzoate to crystallize benzoic acid. The weight mean size of the product crystals increases with increasing stirring rate, reaches a maximum, and then decreases again. Larger crystals may be produced if the reactant feed point is positioned close to t... hiện toàn bộ
Simulation of Ostwald ripening in a reactive batch crystallizer
AICHE Journal - Tập 33 Số 1 - Trang 152-156 - 1987
Narayan S. Tavare
Model identification and control strategies for batch cooling crystallizers
AICHE Journal - Tập 40 Số 8 - Trang 1312-1327 - 1994
Stephen Matteo Miller, James B. Rawlings
AbstractThe open‐loop optimal control strategy to regulate the crystal‐size distribution of batch cooling crystallizers handles input, output, and final‐time constraints, and is applicable to crystallization with size‐dependent growth rate, growth dispersion, and fines dissolution. The objective function can be formulated to consider solid‐liquid separation in subsequent processing steps.A model‐b... hiện toàn bộ
Synthesis of reactive crystallization processes
AICHE Journal - Tập 43 Số 7 - Trang 1737-1750 - 1997
David A. Berry, Ka Ming Ng
AbstractA systematic method is presented to synthesize reactive crystallization processes. It shows how to selectively crystallize a desired solid product(s) after a reaction step and how to use compound formation to effect separation of a mixture. The method is based on the generation of phase diagrams with liquid‐phase reactions. Using transformed coordinates, systems with three or fewer degrees... hiện toàn bộ
Rheological properties of mixed polysaccharides and polysaccharide‐thickened emulsions
AICHE Journal - Tập 42 Số 7 - Trang 1824-1832 - 1996
Rajinder Pal
AbstractSteady flow and viscoelastic properties of mixed‐polysaccharides and mixed‐polysaccharide‐thickened oil‐in‐water emulsions are investigated with a cone‐and‐plate system using a controlled‐stress rheometer. The mixed‐polysaccharide system studied is xanthan gum and guar gum. The rheological properties of the mixed‐polysaccharide systems exhibit strong synergistic effects. For a total polysa... hiện toàn bộ
Coarsening of immiscible co‐continuous blends during quiescent annealing
AICHE Journal - Tập 51 Số 1 - Trang 271-280 - 2005
Zhenhua Yuan, Basil D. Favis
AbstractThe quiescent annealing of four different co‐continuous polystyrene/high‐density polyethylene blends of widely different viscosity ratios were examined at three different temperatures. In addition, the coarsening of a co‐continuous poly(methyl‐methacrylate)/high‐density polyethylene blend was also studied. Since the morphology of co‐continuous systems is very difficult to accurately analyz... hiện toàn bộ
Investigation of the dynamic capillary pressure during displacement process in fractured tight rocks
AICHE Journal - Tập 66 Số 1 - 2020
Ying Li, Haitao Li, Shengnan Chen, Hongwen Luo, Chang Liu
AbstractThis work investigates the dynamic capillary pressure during the displacement process in fractured tight rocks, through specially designed experiments on fractured and intact core samples. The dynamic capillarity coefficient of matrix and the multiphase flow behaviors are also obtained. Results have shown that the dynamic capillary pressure of the matrix becomes around 5–20% higher after t... hiện toàn bộ
Modeling of a continuous rotary reactor for carbon nanotube synthesis by catalytic chemical vapor deposition
AICHE Journal - Tập 55 Số 3 - Trang 675-686 - 2009
Sophie Pirard, Jean‐Paul Pirard, Christophe Bossuot
AbstractThe modeling of carbon nanotube production by the CCVD process in a continuous rotary reactor with mobile bed was performed according to a rigorous chemical reaction engineering approach. The geometric, hydrodynamic, physical and physicochemical factors governing the process were analyzed in order to establish the reactor equations. While the study of the hydrodynamic factor suggests a co‐... hiện toàn bộ
Coalescence in fibrous beds
AICHE Journal - Tập 12 Số 6 - Trang 1045-1050 - 1966
S. S. Sareen, Philip Rose, R. C. Gudesen, R. C. Kintner
AbstractThe factors affecting the efficacy of a closely packed bed of mixed cotton and a supporting fiber (Teflon, glass, Dynel) were evaluated for oil‐in‐water dispersions. Several other water‐organic systems were also tested. Superficial velocities ranged from 0.2 to 3.5 ft./min. Successful coalescence was attained at interfacial tensions as low as 3.5 dynes/cm. Dispersed phase viscosity was var... hiện toàn bộ
Pneumatic transport of granular materials with electrostatic effects
AICHE Journal - Tập 58 Số 4 - Trang 1040-1059 - 2012
Eldin Wee Chuan Lim, Jun Yao, Yanlin Zhao
AbstractThe methodology of coupling large eddy simulation (LES) with the discrete element method was applied for computational studies of pneumatic transport of granular materials through vertical and horizontal pipes in the presence of electrostatic effects. The LES numerical results obtained agreed well with the law of the wall for various y+‐ranges. The simulations showed that a thin layer of p... hiện toàn bộ
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