Submitted on: 27 February 2004.
Revised on: 21 May 2004.
Accepted on: 01 June 2004.
___________________Chemical Industry & Chemical Engineering Quarterly
http://reply.papertrans.cn/1/51/5097/5097-32.png
http://reply.papertrans.cn/1/51/5097/5097-33.png
Submitted on: 30 April 2008.
Revised on: 24 May 2008.
Accepted on: 11 June 2008.
___________________Chemical Industry & Chemical Engineering Quarterly
http://reply.papertrans.cn/1/51/5097/5097-35.png
http://reply.papertrans.cn/1/51/5097/5097-36.png