Published by Department of Chemical Engineering University of Diponegoro Semarang 
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 IJSEĀ  by http://ejournal.undip.ac.id/index.php/ijse is licensed under Creative Commons Attribution 3.0 License.
 IJSEĀ  by http://ejournal.undip.ac.id/index.php/ijse is licensed under Creative Commons Attribution 3.0 License.
 
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		Ahmad Mustafa
								
Faculty of Chemical Engineering and Natural Resources, University of Technology Malaysia, Skudai Johor Baharu, Malaysia		
Indonesia	
		Tutuk Djoko Kusworo
								
Faculty of Engineering, University of Diponegoro, Jl. Prof. Sudharto Tembalang, Semarang, Indonesia. tutukjoko@yahoo.com			
		Abdullah Busairi
								
Faculty of Engineering, University of Diponegoro, Jl. Prof. Sudharto Tembalang, Semarang, Indonesia. tutukjoko@yahoo.com			
		Ahmad Fauzi Ismail
								
Faculty of Chemical Engineering and Natural Resources, University of Technology Malaysia, Skudai Johor Baharu, Malaysia			
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 IJSEĀ  by http://ejournal.undip.ac.id/index.php/ijse is licensed under Creative Commons Attribution 3.0 License.
 IJSEĀ  by http://ejournal.undip.ac.id/index.php/ijse is licensed under Creative Commons Attribution 3.0 License.