Submitted on: 25 November 1999.
Revised on: 17 December 1999.
Accepted on: 31 December 1999.
___________________CHEMICAL ENGINEERING & TECHNOLOGY
Submitted on: 07 September 2013.
Revised on: 21 November 2013.
Accepted on: 18 January 2014.
___________________CHEMICAL ENGINEERING & TECHNOLOGY
Submitted on: 31 July 2000.
Revised on: 22 September 2000.
Accepted on: 12 October 2000.
___________________CHEMICAL ENGINEERING & TECHNOLOGY
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