乙烯衍生物製程之設計與整合：環氧乙烷與苯乙烯單體之案例研究

胡偉駿

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乙烯衍生物製程之設計與整合：環氧乙烷與苯乙烯單體之案例研究

Ethylene-Derived Process Design and Integration:Case Studies of Ethylene Oxide and Styrene Monomer

胡偉駿 , Masters　　Advisor：陳錫仁　　

繁體中文

換熱器網路；本質安全設計；爆炸界線；乙二醇；環氧乙烷；苯乙烯； heat exchanger network ； inherent safe designs ； explosion limits ； ethylene oxide ； styrene

Abstract │ Reference (24) │ Times Cited (1) │ Altmetrics

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Since energy crisis, heat integration has become one of the important issues in the process systems engineering.  Due to the price of energy is constantly rising, how to increase the efficient use of energy in the process has also become of great importance in the field of process design.  
Ethylene oxide and styrene are both derived from the most basic and important building block of petrochemicals, i.e., ethylene.  Ethylene oxide is a chemical used to make ethylene glycol, which is the primary ingredient in antifreeze.  It is also used in the manufacture of ethylene-oxide derivatives (EOD), including both of the low molecular and high molecular polymers for use in many applications such as detergent additives.  Styrene is the monomer used to make polystyrene, which has a multitude of uses, and has been an important intermediate chemical in the plastics industries and rubber industries.  In terms of inherent safe designs, since ethylene oxide has a very wide range of explosion limits－3-80%, we have to pay attention to the design of reactors.  It is also worth mentioning that the styrene product can spontaneously polymerize at higher temperature, it is necessary to maintain the product temperature below 125℃.
In this thesis, we have carried out two case studies: one is “ethylene oxide process”, and the other is “styrene monomer process”.  Ethylene-oxide process belongs to an important category as oxidation in the chemical industries.  Like most ethyl benzene/styrene facilities, there is significant heat integration between the two plants.  The ethyl benzene reaction is exothermic, so steam is produced, and the styrene reaction is endothermic, so energy is used in the form of steam.    Both of the two cases were simulated first by using AspenPlus.  Then, heat- exchanger network designs were synthesized and analyzed by using SuperTarget.  Significant utility savings were achieved for both of the two case studies.  The hot utility savings is 34% and cold utility savings is 25%, as compared with the base-case design, for the ethylene-oxide process with a minimum approach temperature of 10℃.  While the hot utility savings is 70% and cold utility savings is 63%, as compared with the base-case design, for the alkylation reaction (exothermic) of the styrene process with a minimum approach temperature of 10℃, the hot utility savings is 30% and cold utility savings is 3%, as compared with the base-case design, for the dehydrogenation reaction (endothermic) of the styrene process with the same minimum approach temperature.  Finally, if we take appropriate cold/hot streams for heat integration from the whole styrene process, we found the hot utility savings is 65% but no cold utility savings with a minimum approach temperature of 10℃.

Reference ( 24 ) 〈TOP〉

Ahmad, S., B. Linnhoff and R. Smith, “Cost Optimum Heat Exchanger Networks: II. Targets and Design for Detailed Capital Cost Models,”Comp. and Chem. Engng., 14, 751 (1990).
連結：
Britton, L.G., Using Material Data in Static Hazard Assessment, Plant/Operations Progress, 11, 2, 56 (1992).
連結：
Douglas, J.M. ,Conceptual Design of Chemical Processes, p.518 (New York: McGraw-Hill, 1988)
連結：
Floudas, C.A., A.R. Ciric and I.E. Grossmann, “Automatic Synthesis of Optimum Heat Exchanger Network Configurations,” AIChE J. 32, 276 (1986).
連結：
Gundersen, T. and I.E. Grossmann, “Improved Optimization Strategies for Automated Heat Exchanger Network Synthesis Through Physical Insights,”Comp. and Chem. Engng., 14, 925 (1990).
連結：

Times Cited (1) 〈TOP〉

林鈺淇(2008)。麻林酐 (順丁烯二酐) 之程序合成與設計。淡江大學化學工程與材料工程學系碩士班學位論文。2008。1-121。

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