JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Apatitic tricalcium phosphate-cadmium carbonate mixture: Its behaviour on heating with and without air

Written by sctunisie no comments

We have prepared a cadmiocalcium OH Ap by heating the equimolar mixture of cadmium carbonate and apatitic tricalcium orthophosphate at different temperatures. Then the mixture was analysed by X-Ray, IR and TGA. Results showed that the structure and stability of the obtained cadminocalcium OH Ap depend on the preparation atmosphere.

M. Farhat, A. Hamad, S. Chemlal

Pages 49-56

A comparative study of Rayleigh and Raman collisional diffusion from gaseous deuterium

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We have studied the collisional Rayleigh and Raman intensity for densities between 18 and 130 Amagat at 293 K. The depolarisation ratios have been compared to those calculated with dipole-induced dipole model taking into account the anisotropy of molecules. The agreement between theory and experience is rather good for low densities.

H. Khalfallah, R. Boukhris, A. Gharbi

Pages 57-64

Short communication: Setting up A band E microwave and tests on KH2PO4 phase transition

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A band E microwave measurement device has been set up and tested. The ferroelectric-paraelectric phase transition of a KH2PO4 monocristal has been observed at a temperature of 123 K for a frequency of 70 GHz. The extreme values of complex permittivity during the transition have been determined.

H. Zangar, M.S. Haouat

Pages 65-67

Synthesis of benzofuro (3-2b) benzofuran and benzofuro (2,3-b) benzofuran derivatives by transposition of Claisen acido catalyses

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Claisen rearrangement of 1,4-diaryloxy 2-butynes in the presence of protonic acid yields first derivates of benzofuro (3,2-b) benzofuran. These products could be transformed to their isomers: derivates of benzofuro (2,3-b) benzofuran by an acidic catalysed shift. A mechanism is proposed for this reaction. 

M. Rammah, B. Laude

Pages 3-13

Contribution to the study of Lepidium sativum (cruciferae). Structure of a new seed compound: Lepidine

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Four compounds were isolated for the first time from the seeds of Lepidium sativum (cruciferae) with alkaloids extraction method: The ethyl-sinapinate 1. the N-N' dibenzylthiourea 2, the N-N' dibenzylurea 3 and a novel compound which we called the lepidine 4. Their structure has been established by spectroscopic means. 

A. Bahroun, M. Damak

Pages 15-24

Analysis of the performance of an absorption heat pump

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After a recall on the principle of on absorption heat pump and a review of a test unit (power: 1 kw) operating with the couple LiBr-H2O, the authors present absorption heat pump performance. The results show that :

  • Exchanger area is a limitant factor of exchange
  • The performance of absorber increases with solution flow rate and decreases with the increase of concentration
  • The experimental COP is less then theoretical COP
  • The level of up-grading 140° from industrial heat recovery (60-80°C) is possible with a COP about 1,4.

S. Gabsi, R. Bugarel

Pages 41-49

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