JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Application de technique d'intégration numérique a la conception rationnelle de réacteurs. Réacteur électrochimique à électrode volumique

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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:

  1. The copper recovery in sulfuric acid medium with a axial field reactor working in diffusion kinetic.
  2. The electrodissolution of iron in water with a radial field reactor working in activation kinetic.

M. Benzina, A. Ratel, A. Bellagi, G. Lacoste

Pages 37-50

Short communication: Sur la réaction de dissolution des phosphates dans les acides: I. Dispositif expérimental et premiers essais

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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

Pages 53-55

Synthèse de bis - Δ1 - pyrazolines dérivées d'acétyléniques disubstitués dissymétriques

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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

Pages 3-9

Evolutions photochimiques et thermiques de bis - Δ1 - pyrazolines dérivant d'acétyéniques diactivés dissymétriques

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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

Pages 11-24

Action de [(CH3)3N, 2HF] sur des époxydes simple et α- fonctionnels dérivés d'un monoterpène bicyclo (3. 1. 1) heptanique

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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

Pages 25-32

Contribution à l'adaptation du système CRYSTAN sur l'IRIS 55

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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

Pages 33-44

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