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Article
Kinetic of Alkaloids Extraction from Plant by Batch Pertraction in Rotating Discs Contactor

Author: Khalid M. Abed خالد محسن عبد
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 2 Pages: 75-84
Publisher: Baghdad University جامعة بغداد

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Abstract

A liquid membrane process of Alkaloids extraction from Datura Innoxia solution was studied applying pertraction process in rotating discs contactor (RDC). Decane as a liquid membrane and dilute sulphuric acid as stripping solution were used. The effect of the fundamental parameters influencing the transport process, e.g. type of solvent used, effect of disks speed, amount of liquid membrane and effect of pH for feed and strip solution. The transport of alkaloids was analysed on the basis of kinetic laws of two consecutive irreversible first order reactions. Thus, the kinetic parameters (k1, k1, R_m^max, tmax, J_F^maxand J_S^max) for the transport of alkaloids were determined. The effect of organic membrane type on percentage of Alkaloids transport was found to be in the order (n-decane> n-heptane> n-hexane> ethyl ether). The results showed that the highest alkaloids extraction was obtained when using two stages, (10 rpm) discs speed, (pH=9.5) of feed solution and (pH=2) of acceptor solution in n-decane. Observation showed that the membrane entrance rate constant k1 and percentage of alkaloids transported in strip phase increased with increasing numbers of stages but the exit rate constant k2 decreased. The alkaloids extraction ratio increased with increasing the disks speed from 5 to 10 rpm but decreased at 15 rpm and decreased when increasing the volume of membrane. Also pH of feed and strip solution affected the extraction ratio and rate constants.


Article
Extraction of Pelletierine from Punica granatum L.by Liquid Membrane Technique and Modelling

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Abstract

This work was conducted to study the extraction of pelletierine sulphate from Punica granatum L. roots by liquid membrane techniques. Pelletierine sulphate is used widely in medicine. The general behavior of extraction process indicates that pelletierine conversion increased with increasing the number of stages and the discs rotation speed but high rotation speed was not favored because of the increased risk of droplet formation during the operation. The pH of feed and acceptor solution was also important. The results exhibit that the highest pelletierine conversion was obtained when using two stages, (10 rpm) discs speed of stainless steel discs, (pH=9.5) of feed solution and (pH=2) of acceptor solution in n-decane. Assuming the existence of two thin reaction layers in the feed and stripping solutions, mathematical model was developed to describe the pelletierine transport. On the basic of the experimental data obtained under various conditions and the model proposed, it was found that the solute transfer into the liquid membrane is mainly diffusion-controlled.

يهدف هذا البحث الى دراسة استخلاص دواء الݒلترين سلفيت من جذور نبات الرمان بأستخدام تقنيات السائل الغشائي. الݒلترين يستخدم بصوره واسعه في الطب ,حيث يستخدم للقضاء على الديدان الشريطيه والديدان المعويه وكعلاج للاسهال و الدازنتري ,وكمضاد بكتيري. وبينت الدراسات الحديثه بأنه يستعمل كمضاد فطري عندما يمزج مع الاملاح الحديديه , وهذه المجموعه نفسها استعملت لاختبار تأثيره على نمو فيروس الايدز.السلوك العام لعملية الاستخلاص يشير الى ان تحول الݒلترين يزداد عند زيادة عدد المراحل وسرعة دوران الاقراص لكن السرع العاليه كانت غير مفضله بسبب تكون قطرات على الاقراص وبالتالي نقصان بالمساحه السطحيه للطبقات المتجدده. ولكن درجة الحامضيه للمحلول الداخل والمستلم كانت محكومه ضمن حد معين.اظهرت النتائج ان اعلى تحول للݒلترين تم الحصول عليه عند استخدام مرحلتين , سرعة دوران الأقراص (10 دوره / دقيقة) و درجة الحامضية للمحلول الداخل =9.5 , درجة الحامضيه للمحلول المستلم = 2 وبأستخدام الديكان كسائل غشائي .تم تطوير موديل رياضي لوصف عملية انتقال الݒلترين على افتراض وجود طبقتي تفاعل رقيقه في المحلول الداخل والمستلم . على اساس البيانات التجريبيه التي تم الحصول عليها والنموذج الرياضي المقترح وجد ان انتقال المذيب الى الغشاء السائل مسيطر عليه بشكل اساسي من قبل الانتشار.

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