IAU Chemical Products in 6th Int’l Festival of Inventors, Initiators, and innovators

Monday, May 29, 2017 - 13:54

One of the main purpose of the ‘Economy of Resistance’ is utilizing domestic resources and forces and reducing dependence on foreign products. In this regard, students are the sources of many services and benefits in economic, social and cultural areas.

ISCA highlighted some of the chemistry inventions by IAU students in the 6th International Festival of Inventors, Initiators, and innovators held in May, 2017:

Anti-corrosion Emulsion for Metals , by Reza Sayadi

Flat Polymeric Membrane Sensor for Carbon Dioxide/Nitrogen Gas Mixture by Ehsan Shabani

A gas sensor was developed to measure the concentration of binary gas mixtures. This sensor works based on the permeability change of different gas mixtures across the polymeric membranes. Although high values of permeability and selectivity are needed for an ideal separation, the performance of this sensor mainly depends on the permeability factor. Polysulfone and silicone rubber were applied as the membrane base and coat, respectively. Moreover, in contrast to existing polymeric sensors that use hollow fibers, the present sensor is made of flat membranes. This new design is cheaper, smaller, and easier to use in comparison to the hollow fiber polymeric sensors. In order to test the sensor applicability, nitrogen and carbon dioxide were used as model gases. The effect of pressure on the response time and sensor accuracy was studied for the aforementioned gases. The response time (T95%) of this low price sensor was 50 s, and the tolerance of measuring concentration was approximately 1.4% at 2 bar feed pressure. Also, increasing the feed pressure can improve the response time or accuracy of the sensor.

Evaluation of a Hybrid Passive Solar-Electrical Dryer For Drying grapes by Behzad Sepehrimehr

A passive hybrid solar-electrical dryer was designed and fabricated at Islamic Azad University, Shoushtar branch, Shoushtar, Iran. The heat sources of this dryer were an electrical heater and a flat solar thermal collector with a 2 square-meter area. The dryer was evaluated for drying grapes by a completely randomized design with five treatments and three replications. Treatments in this research were contained: 1.drying in open air (control), 2. Indirect solar drying, 3. Indirect solar drying with a 600W electrical heater, 4. Indirect solar drying with a 1200W electrical heater, 5. Mixed mode solar Drying with 1200W electrical heater. The results showed that there was a significant difference among the moisture ratio of dried samples in each treatment. Dried raisins produced by the third treatment had a better quality, color and appearance. In last treatment, the grapes were dried in less time and with a significant difference compared with the other treatments. The final grape moisture ratio in this research was % 16.

Membrane Reactor for Production of High-Purity Biodiesel by Motahareh Vares

Purification of Trans-esterified product poses a great challenge in commercial production and application of biodiesel fuel. Membrane reactor technologies are proven to be effective ways to achieve optimum yields and reduce energy costs for biodiesel production. In this study, a novel membrane reactor has been successfully developed to produce high quality methyl esters from canola oil. This particular reactor enables the separation of FAME from the reactants and by-products. The biodiesel obtained from ceramic membrane with 0.05 µm pore size gave purity of 96.42%, besides properties such as kinematic viscosity (5.32 mm/s2), density (0.886 g/cm3), flash point (142.5 0C), pour point (-120C) and cetane number (52) conforming the ASTM specification. The obtained results showed that membrane reactor is a suitable alternative for biodiesel production. Effect of various parameters such as methanol/oil molar ratio (4:1-7:1), catalyst concentration (0.25-1.50%) and reaction time (1-7h) were investigated. The biodiesel with best yield and quality was produced at methanol/oil molar ratio, 6:1; potassium hydroxide catalyst concentration, 1.0% and reaction time 7 h. The yield of biodiesel produced under optimal conditions was 96.42%.

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