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 fe...... 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
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, sy...... 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 synerg...... hiện toàn bộ
Prediction of particle charging in a dilute pneumatic conveying system
AICHE Journal - Tập 59 Số 7 - Trang 2308-2316 - 2013
Poom Bunchatheeravate, Jennifer Curtis, Yusuke Fujii, Shuji Matsusaka
When particles are transported in pipelines, they acquire electrostatic charges as they come into contact with the pipe wall. Charged particles can cause problems such as particle agglomeration, blockage, and explosion. Understanding the particle charge can help to prevent these issues. This study investigates a technique for predicting the particle charge in a straight pipe of any given l...... hiện toàn bộ
Drag coefficient and relative velocity in bubbly, droplet or particulate flows
AICHE Journal - Tập 25 Số 5 - Trang 843-855 - 1979
Mamoru Ishii, N. Zuber
AbstractDrag coefficient and relative motion correlations for dispersed two‐phase flows of bubbles, drops, and particles were developed from simple similarity criteria and a mixture viscosity model. The results are compared with a number of experimental data, and satisfactory agreements are obtained at wide ranges of the particle concentration and Reynolds number. ...... hiện toàn bộ
A hybrid neural network‐first principles approach to process modeling
AICHE Journal - Tập 38 Số 10 - Trang 1499-1511 - 1992
Dimitris C. Psichogios, Lyle Ungar
AbstractA hybrid neural network‐first principles modeling scheme is developed and used to model a fedbatch bioreactor. The hybrid model combines a partial first principles model, which incorporates the available prior knowledge about the process being modeled, with a neural network which serves as an estimator of unmeasured process parameters that are difficult to ...... hiện toàn bộ
Reduced dynamic modeling approach for rectification columns based on compartmentalization and artificial neural networks
AICHE Journal - Tập 65 Số 5 - 2019
Pascal M. Schäfer, Adrian Caspari, Kerstin Kleinhans, Adel Mhamdi, Alexander Mitsos
AbstractThe availability of reduced‐dimensional, accurate dynamic models is crucial for the optimal operation of chemical processes in fast‐changing environments. Herein, we present a reduced modeling approach for rectification columns. The model combines compartmentalization to reduce the number of differential equations with artificial neural networks to express ...... hiện toàn bộ
Generalized numerical solutions of freezing a saturated liquid in cylinders and spheres
AICHE Journal - Tập 13 Số 1 - Trang 165-169 - 1967
Luh C. Tao
AbstractA numerical method and graphs of generalized solutions are presented for a moving interface problem of freezing a saturated liquid inside a cylindrical or a spherical container with a constant heat transfer coefficient, as well as melting a saturated solid. The frozen solid phase has a constant heat capacity.
Wall‐to‐bed heat transfer in gas–solid bubbling fluidized beds
AICHE Journal - Tập 52 Số 1 - Trang 58-74 - 2006
D.J. Patil, J. Smit, M. van Sint Annaland, J.A.M. Kuipers
AbstractThe wall‐to‐bed heat transfer in gas–solid fluidized beds is mainly determined by phenomena prevailing in a “thermal boundary layer ” with a thickness in the order of magnitude of the size of a single particle. In this thermal boundary layer the temperature gradients are very steep and the local porosity profile near the wall strongly influences the heat‐tr...... hiện toàn bộ
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