د. منتهى عون
- إجازة في الهندسة الكيميائية (نظام 6 سنوات) من المدرسة القومية للمهندسين بقابس، جامعة صفاقس (تونس) - 1989.
- دبلوم في الدراسات المعمقة: DEA (نظام سنتين) في الكيمياء اللاعضوية من كلية العلوم بتونس، جامعة تونس 2 (تونس) 1991.
- دكتوراه في الهندسة الكيميائية من المعهد الوطني البوليتكنيكي في اللورين INPL نانسي (فرنسا) - 1996.
الاتصال
الخبرات السابقة:
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الابحاث:
الاستعمالات الشعبية والمعالجات الطبية باللبان
Natural resins played an important role in the daily life and rituals of religious ceremonies of aromatic aroma and its various medicinal effects since ancient. Boswellia, one of the most important natural resins, is the subject of our research. The Boswellia plants are species of Saponins. They produce aromatic resins given by laticiferous ducts through a process of stripping the bark of the branches; a yellow gum is released, then frozen in natural conditions in small granules known as Boswellia resins or frankincense. Through the study of combinations and mixtures contained in some manuscripts and modern research, it was found that frankincense was used in several fields in different historical periods. It is still used in religious ceremonies in Roman Catholic, Episcopal, Orthodox and Indian churches. - مجلة بحوث جامعة حلب، سلسلة العلوم الطبية، العدد 133.
قراءة المزيد >>الشب في المستحضرات الصيدلانية: بين الماضي والحاضر
- مجلة بحوث جامعة حلب، سلسلة العلوم الطبية، العدد 128.
قراءة المزيد >>Investigation of nucleation and crystal growth kinetics of nickel manganese oxalates
The nucleation and the crystal growth rates of mixed nickel manganese oxalates have been determined from the changes of the ionic concentration of the solution and the crystal size distribution during the precipitation process within a supersaturation range 0–0.1 M. Thermodynamic solubility calculations have been used to identify the different species contributing the precipitation reaction and for estimation of the thermodynamic constant. Experimental data show that the nucleation rate of mixed nickel manganese oxalate in this supersaturation range is consistent with a primary heterogeneous mechanism and was found to obey to an exponential law. The crystal growth rates indicate a surface-integration-controlled mechanism with a first-order law with respect to the supersaturation. - Journal of Crystal Growth, vol. 279, pp. 531-539
قراءة المزيد >>تصنيع مساحيق أكسالات المنغنيز والنيكل عالية الجودة في مفاعل أنبوبي جديد مجزأ التدفق
High-quality nickel manganese oxalates have been prepared using an innovative approach for the production of homogeneous powders, the continuous Segmented Flow Tubular Reactor (SFTR). This new reactor is mainly composed of a mixer, a segmenter, a tubular section and a decanter. Mixed Ni–Mn oxalates are synthesized in the SFTR. The powders present controlled morphology, narrow particle size distribution, high purity and desired stoichiometry. Their characteristics are compared to those of powders obtained in a batch reactor. These oxalates are precursors for nickel manganites, used as negative temperature coefficient thermistor (NTC) ceramics. - Solid State Ionics, vol. 171, pp. 135-140, 2004
قراءة المزيد >>تطوير مفاعل أنبوبي ذو تدفق مجزأ مستمر ومفهوم الانتقال إلى الشروط الصناعية بحثًا عن مساحيق مثالية
The synthesis of powders with controlled shape and narrow particle size distributions is still a major challenge for many industries. A continuous Segmented Flow Tubular Reactor (SFTR) has been developed to overcome homogeneity and scale-up problems encountered when using batch reactors. Supersaturation is created by mixing the co-reactants in a micromixer inducing precipitation; the suspension is then segmented into identical micro-volumes by a non-miscible fluid and sent through a tube. These micro-volumes are more homogeneous when compared to large batch reactors leading to narrower size distributions, better particle morphology, polymorph selectivity and stoichiometry. - Chemical Engineering Technology, vol. 26-3, pp. 303-305
قراءة المزيد >>طريقة تجريبية ونموذج سلسلة ماركوف لوصف الخلط المحوري والشعاعي في خلاط دائري
An experimental methodology is developed to investigate the simultaneous axial and radial mixing of particles in a hoop mixer. This involves following the migration of a colored tracer, with flow properties identical to that of the bulk using tracer detection by image analysis. The particle transitions from all initial tracer positions inside the mixer are calculated and the experimental conditions are established which improve the homogeneity of the mixture. Finally, a Markov chain model is derived which gives a good representation of the experimental data. - Powder technology, vol. 128, pp. 159-167
قراءة المزيد >>Mathematical model of a periodical mixer
- Mathematical model of periodical mixer, vol. 44, pp.140-141.
قراءة المزيد >>تحديد آني لسرعتي التنوي والنمو البلوري انطلاقا من تجارب ترسيب كيميائي تلقائي متقطعة
A review of the literature shows that many methods for determining the nucleation and growth rates from batch precipitation experiments are inaccurate. Therefore, a new method has been developed to derive these two rates based on the simultaneous measurement of the supersaturation and the crystal size distribution during a batch spontaneous precipitation. All experimental data are used without any previous numerical treatment and the differential kinetic equations are replaced by integral ones to avoid numeric derivation. The kinetic parameters of the two postulated laws of nucleation and crystal growth rates in kinetic equations are separately determined by non-linear optimization. - Chemical Engineering Science, vol. 54, pp. 1161-1180.
قراءة المزيد >>هل حركية الترسيب الكيميائي لكبريتات الباريوم معروفة بشكل كافٍ لاختبار نماذج مفاعلات الترسيب الكيميائي؟
Barium sulphate precipitation, widely used to validate micromixing models, requires the knowledge of nucleation and crystal growth kinetics under non stoichiometric conditions, which is generally the case when two fluids are mixed. Therefore, the spontaneous precipitation of barium sulphate was studied under both stoichiometric and non stoichiometric conditions. A new method was developed to derive the nucleation and crystal growth rates based on the simultaneous measurement of concentration and crystal size distribution. Two expressions were proposed describing well nucleation and crystal growth kinetics. The kinetic parameters were determined as a function of the initial concentration ratio, showing the crucial effect of stoichiometry on the nucleation and crystal growth kinetics. Consequently, attention should be paid to the use of kinetic laws of barium sulphate precipitation to validate micromixing models. - Chemical Engineering Science, vol. 51, pp. 2449-2458.
قراءة المزيد >>تأثير ضغط بخار الماء على تبلور ملح من فوسفات المغنيزيوم
- Journal de la Société Chimique de Tunisie, vol III n°2, pp. 105-112
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