Submitted on: 28 August 2003.
Revised on: 06 December 2003.
Accepted on: 19 December 2003.
___________________CHEMICAL ENGINEERING RESEARCH & DESIGN
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Submitted on: 11 December 2004.
Revised on: 11 February 2005.
Accepted on: 08 March 2005.
___________________CHEMICAL ENGINEERING RESEARCH & DESIGN
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