For reactor design, many different balances (material, energy...) take place and require analytical or numerical techniques. In this study, an approach to the understanding of an electrochemical reactor is developed similar to that considered for the case of a chemical reactor. Both mass transfer and current density equations connecting the different species in solution, form a system of three differential equations. The numerical resolution is proposed in two examples:
- The copper recovery in sulfuric acid medium with a axial field reactor working in diffusion kinetic.
- The electrodissolution of iron in water with a radial field reactor working in activation kinetic.
M. Benzina, A. Ratel, A. Bellagi, G. Lacoste
Sunlight is used instead of a medium-pressure mercury lamp to perform the oxidative photocyclisation of the diarylethylene I to the pentahelicene II ; the chemical yield is the same as for the UV induced reaction.
A. M'henni, B. Ben Hassine, M. Gorsane
An isoperibol calorimeter is described ; and the device has been tested with the dissolution of [Tri (methyl hydroxy) amino methane] in HCl 0,1 M/Kg solution. Test reaction gave ΔH = 30,07 KJ mol. The results obtained with this device for the βT.C.P. dissolution in HNO3 55 Wt % lead to ΔH = -154,89 ± 0,33 KJ.mol.
A. Ben Cherifa, B. Omezzine, M. Jemal
The adsorption isotherms have been studied by different authors and recent works based on thermodynamic considerations have been published. This article is a review of the different models proposed in literature.
M. Dhahbi (ex. Hamdi)
The double cycloaddition 1,3 - dipolar of 2-diazopropane on dissymetrically activated substitued acetylenics has enabled us to synthesize some new organic products of the type bis - Δ1 -pyrazoline. However the transposed pyrazoline, derived directly from the benzoyl -7 carbomethoxy -8 bis - Δ1 -pyrazoline, was entirely identified and has proved the existence of the structure of this latter compound.
A. Khemiss, M. Franck-Neumann
The thermolyses of bis - Δ1 - pyrazolines derived from dissymetric diactiva ted acetylenics have univocally enabled us to get only one product. Except for the cyano -7- ,omethoxy -8 bis - Δ1 -pyrazoline which has given, besides the expected transposed pyrazolenine, a diazo-compound, all the others have led to the corresponding transposed pyrazolenines. In the same way, all the sensitized photolysis of the persubstituted Δ1-pyrazolines have exclusively enabled us to get conjugated dienes, persubstituted too, by losing two nitrogen moles.
A. Khemiss, M. Franck-Neumann
The reactivity of a simple and other epoxides bearing a function in α-position, derived from α-pinene, submitted to the complex [(CH3)3N, 2HF] is studied and compared with the known reactivity of ZnBr2 on the same epoxides. These reactions are comparable to each other to a certain extent except for the epoxyapoverbanone which does not undergo any transformation when treated with [(RCH3)3N, 2HFI].
H. Amri, M.M. El Gaied, M. M'hirsi
CRYSTAN is a crystallographic program system for minicomputers written in FORTRAN IV language. We choose this system because it may be divided in five nearly independent blocks and is easy to handle. The blocks FOURIER procedures and least squares refinement and a large part of data handling have been implemented on the IRIS 55 computer at the CIRIA of Tunis. We describe in this work some special features in handling this system on this computer and some test examples.
M. Abene, A. Yacoubi, A. Bizid, A. Kallel
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