CEP-327-Mass-Transfer-Sessional-Lab-Report-Group-07-Diffusion.pdf

CEP-327-Mass-Transfer-Sessional-Lab-Report-Group-07-Diffusion.pdf

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SHAHJALAL UNIVERSITY OF SCIENCE AND TECHNOLOGY Department of Chemical Engineering and Polymer Science Lab Report: 02 Experiment No: 02 Experiment Name: Diffusion of acetone through stagnant non-diffusing air. Group No: 07 Course Code: CEP 327 Course Title: Mass Transfer Sessional Submission Date: 12 / 02 / 2018 Submitted to: Rahatun Akter Assistant Professor Dept. of CEP, SUST Submitted by: Name Registration Number Md. Woashib Shikder 2014332030 Dwip Roy 2014332031 Shehab Shahreyar 2014332040 Shafoan Alam 2014332058 Md Ripon Ali 2014332070
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Abstract A molecular diffusion experiment was conducted for determining the diffusion coefficient of acetone into air. This acetone was placed in a Stefan tube and was allowed to diffuse into non- diffusing air. At first, this experiment was done at room temperature. There was a centrifugal pump to pass over fresh air stream over the top of the tube. The flow rate of air was constant for all temperature. By molecular diffusion, acetone diffused from tube to the non diffusing air. Then the time for diffusion of 5 mm height of acetone in tube was determined. The experiment was repeated by changing temperature to 43.5 o C and50 o C.The tube was kept at water bath to get desired temperature. The diffusivity of acetone at two different temperatures is determined through calculation. The diffusivity of acetone at temperature of room temperature, 43.5 o C and 50 o C are 4.3406*10 -3 m 2 /s, 3.9688*10 -8 m 2 /s and 2.4712*10 -8 m 2 /s respectively. By this experiment, the diffusivity of acetone was measured at three different temperatures. Introduction Molecular diffusion is the transfer or movement of individual molecules through a fluid by random molecular movements . In the diffusion process, the molecules of interest flow from regions of high concentration to low concentration. Molecular diffusion can occur in both directions with the system. Many chemical engineering processes involve mass transfer by diffusion, in which concentration gradient is the driving force. For example, evaporation of a liquid into air, transfer of nutrient and oxygen to microorganism fermentation process, transfer of reactants to the catalyst surface in catalytic reaction. The diffusivity coefficient characterizes the rate of a process, and is the basic parameter in the modeling and prediction of a diffusion process.
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