Chemical reactors
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Recent papers in Chemical reactors
A basic yet essential element of every traffic flow control is the effect of a junction where the flow is separated into several streams. How do pedestrians, vehicles or blood cells divide when they reach a junction? How does the outcome... more
This paper introduces a methodology for obtaining accurate continuous-time multiple-input, multiple-output models of nonlinear dynamic systems with Wiener characteristics. The models are obtained from complete reliance on experimental... more
In multiphase chemical reactor analysis the dispersed phase distribution plays a major role in obtaining reliable predictions. The population balance equation is a well established equation for describing the evolution of the dispersed... more
A new device/technique, Gas Reactor And Solid Sample Hopper designated GRASSHopper II, is described as an alternative to magic-angle spinning (MAS) for in situ NMR experiments on reacting heterogeneous systems. It is capable of supporting... more
Experiments were conducted in 0.05 m ID and 0.23 m ID by 3 m tall bubble columns with different types of molten waxes as the liquid medium and nitrogen as the gas, under processing conditions typical or Fischer-Tropsch synthesis over iron... more
Although nonlinear inverse and predictive control techniques based on artificial neural networks have been extensively applied to nonlinear systems, their use in real time applications is generally limited. In this paper neural inverse... more
This paper is focused on the development of non linear neural models able to provide appropriate predictions when acting as process simulators. Parallel identification models can be used for this purpose. However, in this work it is shown... more
bstractThis paper is focused on the development of nonlinear models predictions when acting as process simulators. The dynamic behaviour of the heat transf chemical reactor has been selected as a case study. Different structures of NARMA... more
This paper discusses the requirements a computer representation of organic reactions should satisfy in order to be adapted to the machine learning of generic reactions. Existing formalisms are classified and analyzed in relation with... more
Chapter 7. Spatio-temporal chaos …………………………………….. 57 Chapter 8. Limit cycles that do not comprise steady states …………... 71 Chapter 9. Predictability in a chaotic ………………..…………………….. 79 Chapter 10. Method of eliminating chaos and the use of... more
Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and... more
The EU FP5 VALCO project is partially based on results earlier obtained within the EU Phare project (SRR1/95) (Ref. [1,2]). Two selected transients, one for each a VVER-440 and a VVER-1000, were analysed in this former project by... more
Characteristics of wall-to-air heat transfer for a fully developed forced convection have been studied in a large rectangular packed duct with 160 cm heated length, 40 cm width, and for low bed equivalent diameter to particle diameter... more
CSTR / PFR Graphical Solution
In this work, we model a countercurrent tubular reactor where an automotive shredder residue (ASR) is subject to pyrolysis. An inert gas is adopted to convey the pyrolysis products; the solid entering the reactor undergoes an endothermic... more
Considering the steady increase of air transport, the French Government decided to support research that aims to better understand condensation trails formation processes, their impact on climate, and to prevent them and manage their... more
In this paper after a literature surveysin which we describe previous development of the theory and the experimental work to prove the theoriesswe discuss the so-called safety diagram and practical values of the relevant parameters in... more
A concept of the safety boundary diagram, elaborated in our previous studies for liquid-liquid heterogeneous reactions, has been developed here for liquid-phase homogeneous semibatch reactors. With the use of this boundary diagram,... more
The presented work is a part of studies carried out to develop a practical method to prevent runaway events in chemical reactors. The use of computational fluid dynamics (CFD) techniques is proposed here to indicate in advance the local... more
Safety aspects in modelling of batch and semibatch stirred tank reactors as well as a model based safety analysis have been considered. Applicability of two basic types of models-i.e. the perfectly mixed reactor model and the CFD model,... more
New aspects of neural modelling of chemical reactors have been investigated in this study. An universal method to create a family of neural models, useful for the reactor and reacting system of any type, has been elaborated and presented.... more
An improved bio-reactor has been developed to allow the high speed, continuos, low energy conversion of various substrates to ethanol. The Continuous Stirred Reactor Separator (CSRS) incorporates gas stripping of the ethanol using a... more
A three-phase nonisothermal heterogeneous model for describing the hydrotreating reactions in a trickle-bed reactor with complete catalyst wetting was solved. It includes correlations for determining solubility data, mass-transfer... more
Diesel Engines emit complex mixtures of inorganic and organic compounds in the form of both solid and vapour phase particles. Most of the particulates released are ultrafine nanoparticles which are detrimental to human health and can... more
In this work thermal runaway of cumene hydroperoxide (CHP) in a storage tank with constant jacket temperature is considered. The divergence method developed by Strozzi and Zaldivar (1994) based on the concept of parametric sensitivity and... more
http://scholar.sun.ac.za 6. THE EFFECT OF CHEMICAL PARAMETERS... 6.1 The influence of the ion concentration on the plating behaviour... 6.2 The influence of the plating current on the crystallisation behaviour..
The intrinsic reaction kinetics of the photocatalytic decomposition of dichloroacetic acid (DCA) at different, but constant oxygen concentrations was studied. Other significant variables were initial DCA concentration, catalyst (titanium... more
Coherent Anti-Stokes Raman Spectroscopy (CARS) has been used to obtain an axial CH, concentration profile in a laboratory catalytic tube-wall reactor. The resulting profile has been successfully compared with a theoretical model. An... more
Evolution de l'erreur relative d'estimation de x 2 (k) (Observateur à grand gain flou).
This report was prepared as an account d work sponsored by an agency of tbc United States Oovarnment Neither tho United Statea Oovammont aor any agcgcy themof, nor any of their employees, & any warranty, wcpms or implied, w arsumw any... more
Computer modeling is necessary part of design new induction heating and melting devices [1]. One of the complicated technologies when it is necessary to simulate coupled electromagnetic, temperature and magnetohydrodynamic fields is... more
With the increase in diameter of the wafers and the tendency to increase operating pressure of chemical vapor deposition reactors, the #ow in these reactors may turn turbulent as a result of buoyancy. The e!ect of turbulence on the CVD... more
The theory of equilibrium relationships for non-equilibrium dependencies previously created for the batch reactor is further developed for the description of the Temporal Analysis of Products (TAP) experimental data. Corrections are... more
In this paper, nonlinear state feedback laws are developed for on-line optimization of batch/semi-batch processes with multiple manipulated inputs. The first-order necessary conditions are cast in terms of the system Lie brackets. Optimal... more
In this research an adaptive fuzzy controller was applied to temperature control of a MMA batch polymerization reactor which use jacket temperature error in additional reactor temperature error. However, the desired jacket temperature is... more
Relationships for calculation of the following parameters of reactors with microwave heating of chemical reagents are presented: the coefficient of absorbed microwave energy distribution in the reactor (in the cavity between the resonator... more
Resumen La contaminación atmosférica se encuentra entre las preocupaciones medioambientales con mayor interés, debido principalmente a que gran parte de la población habita zonas urbanas e industriales. En la literatura aparecen numerosos... more