Effects of sulphuric acid and speed rotation on hydrolysis of bamboo sawdust
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Date
2016-06
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Abstract
There are two parts in this research work; first is the experimental works and followed by computational works by using ANSYS Fluent. The aim of the study is to overcome the limitations of hydrolysis experimental method and provide a higher understanding of the mechanism of hydrolysis process. It can be achieve by obtaining the correlation between both experimental and computational methods. The studied parameters in this research work are sulphuric acid concentration and the speed rotation of the stirrer. The experimental result, which is percent crystallinity obtained are analyzed by using the Full Factorial Design analysis in Minitab 16. The outcomes from DOE analysis are supported by the X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM) analysis. As for computational works, speed rotation of stirrer is simulated in ANSYS Fluent 15.0 to identify its behavior during the hydrolysis process, and obtain the phases contours and velocity profiles. The experimental result shows that the sulphuric acid concentration is the main influences to affect the percent crystallinity compared to speed rotation. It is proved by the DOE analysis and supported by XRD and SEM analysis in experimental works. The characterization done before and after hydrolysis process to determine the changes occur on the BSD surface. The BSD surface is destructed and pores randomly distributed after hydrolysis process. The velocity profile of stirrer speed rotation explained the condition in the reaction flask that made it less influence than the sulphuric acid concentration. It is shows the correlation between the experimental and simulation works that proved the sulphuric acid concentration is the strongest influences in the research work. The optimum condition that can be suggested to obtain low percent crystallinity are when the sulphuric acid concentration and speed rotation of stirrer at 4M and 400 rpm respectively.