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Journal of Zhejiang University SCIENCE A 2002 Vol.3 No.4 P.405-411

http://doi.org/10.1631/jzus.2002.0405


Multiple objectives application approach to waste minimization


Author(s):  ZHANG Qing-yu

Affiliation(s):  Department of Environmental Science and Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   qy-zhang@zju.edu.cn

Key Words:  Waste minimization, Multiple objectives optimization, Chemical reaction process


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ZHANG Qing-yu. Multiple objectives application approach to waste minimization[J]. Journal of Zhejiang University Science A, 2002, 3(4): 405-411.

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Abstract: 
Besides economics and controllability, waste minimization has now become an objective in designing chemical processes, and usually leads to high costs of investment and operation. An attempt was made to minimize waste discharged from chemical reaction processes during the design and modification process while the operation conditions were also optimized to meet the requirements of technology and economics. Multiobjectives decision nonlinear programming (NLP) was employed to optimize the operation conditions of a chemical reaction process and reduce waste. A modeling language package-SPEEDUP was used to simulate the process. This paper presents a case study of the benzene production process. The flowsheet factors affecting the economics and waste generation were examined. Constraints were imposed to reduce the number of objectives and carry out optimal calculations easily. After comparisons of all possible solutions, best-compromise approach was applied to meet technological requirements and minimize waste.

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Reference

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[9] Luyben, M.L., Floudas, C.A., 1994a. Analyzing the Interaction of design and control--1. A multiobjective framework and application to binary distillation synthesis. Computers Chem. Engng, 18(10): 933-969.

[10] Luyben, M.L., Floudas, C.A., 1994b. Analyzing the interaction of design and control--2. reactor-separator-recycle system. computers Chem. engng, 18(10):971-994.

[11] Nathanson, J.A., 1986. Basic environmental Technology: Water, Supply, Waste Disposal, and Pollution Control, Wiley, New York, p.23-24.

[12] Palazoglu, A., Arkun, T., 1986. Design of chemical plants in the presence of process uncertainty: A multiobjective approach. Computers Chem. Engng 10:567-575.

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[14] SPEEDUP user manual Aspen Technology, Inc. 1993.

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