Vol. 28 1998 Nş 1,2

CONTENTS

ARTICLES
PLENARY SESSIONS
D. B. Manley THERMODYNAMICALLY EFFICIENT DISTILLATION: ETHYLENE RECOVERY 1
G. Maurer THERMODYNAMICS OF AQUEOUS SYSTEMS OF REACTING GASES FOR PROCESS DESIGN IN THE PETROCHEMICAL AND RELATED INDUSTRIES 7
P. J.A.M. Kerkhof NEW DEVELOPMENTS IN MEMBRANE TRANSPORT PHENOMENA 15
COMPUTING APPLICATIONS
G. S. Mannarino, G. P. Henning, H. P. Leone MULTIVIEW ENTERPRISE MODELS FOR PROCESS INDUSTRIES 25
I. Ponzoni, M. C. Sánchez, N. B. Brignole CDHG: A NEW PARTITIONING ALGORITHM BASED ON THE DETECTION OF CYCLES IN HYPERGRAPHS 31
INDUSTRIAL APPLICATIONS
R. F. P. M. Moreira, N. C. Kuhnen, M. G. Peruch ADSORPTION OF REACTIVE DYES ONTO GRANULAR ACTIVATED CARBON 37
DYNAMICS AND CONTROL
A. Etchepareborda, R. Haran, J. Lolich DISCRETE NONLINEAR PROCESS CONTROL USING NEURAL NETWORKS 43
D. W. Berns, J. L. Moiola MULTIPLE OSCILLATIONS IN A CHEMICAL REACTOR 49
DESIGN AND SYNTHESIS
M. R. Galli, J. Cerdá A USER-CONTROLLED FRAMEWORK FOR THE SYNTHESIS OF HEAT EXCHANGER NETWORKS INVOLVING NON-ISOTHERMAL MIXERS 57
TRANSPORT PHENOMENA
J. A. Deiber, M. B. Peirotti, A. Gappa MODELING THE BATCH EVAPORATION OF NYLON SALT SOLUTION: THEORY AND EXPERIMENTS 63
R. A. Bortolozzi, J. A. Deiber TWO- AND ONE-FIELD MODELS FOR NATURAL CONVECTION IN POROUS MEDIA 69
A. L. Souza, A. L. Andrade MASS TRANSFER IN GASEOUS BUBBLES WITH LIQUID PHASE CHEMICAL REACTION 75
FOOD ENGINEERING AND BIOTECHNOLOGY
L. A. Campańone, V. O. Salvadori, R. H. Mascheroni A FINITE-DIFFERENCE METHOD TO SOLVE COUPLED HEAT AND MASS BALANCES WITH SIMULTANEOUS SURFACE DEHYDRATION DURING FREEZING 83
G. Raya-Tonetti, N. I. Perotti EXPANDED BED AFFINITY CHROMATOGRAPHY USING STREAMLINE-CIBACRON RED 3BA FOR SIMULTANEOUS PURIFICATION OF ALCOHOL DEHYDROGENASE AND GLUCOSE-6-PHOSPHATE DEHYDROGENASE FROM UNCLARIFIED YEAST HOMOGENATE 89
CHEMICAL REACTORS
E. O. Cobo, J. M. Bisang, J. B. Bessone SIMULATION OF FIXED BED ELECTROCHEMICAL REACTORS UNDER LIMITING CURRENT CONDITIONS 95
M. H. Lacunza, P. E. Ugrin, A. Brandolin HIGH PRESSURE POLYMERIZATION OF ETHYLENE IN TUBULAR REACTORS. PARAMETRIC STUDY TO OBTAIN MAXIMUM PRODUCTIVITY. 101
SIMULATION AND OPTIMIZATION
M. Tvrzská de Gouvęa, D. Odloak ON-LINE MAXIMIZATION OF LPG IN THE FCC UNIT 107
A. B. Souzani, J. M. Pinto PRODUCTION OPTIMIZATION OF BATCH PLANTS WITH PREDEFINED ALLOCATION 115
S. Diaz, A. Serrani, A. Bandoni, E. A. Brignole A SIMULATOR/OPTIMIZER FOR NATURAL GAS PLANTS 123
C. G. Raspanti, J. A. Bandoni, L. Biegler NEW FASTER SOLUTION FOR THE STEADY-STATE BACK-OFF PROBLEM 129
THERMODYNAMICS
M. Aznar, L. Stragevitch, S. G. d’Ávila LIQUID-LIQUID EQUILIBRIA: A COMPARISON BETWEEN ORIGINAL AND MODIFIED UNIFAC 135

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