乳酸乙酯反應蒸餾與萃取蒸餾分離製程之設計與經濟評估

Novel Ethyl Lactate Production Process Design using Reactive Distillation and Extractive Distillation Configuration

田依恩(Yien Tien)

指導教授 ： 陳誠亮

共同指導教授 ： 李豪業(Hao-Yeh Lee)

國立臺灣大學/工學院/化學工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202104118

摘要

本研究目的是為了建立更具競爭性的商業規模的乳酸乙酯（L1E）生產製程，因為其在綠色溶劑上的有龐大的發展潛力，但售價仍無法跟傳統溶劑競爭，由前人發展的專利開始改良，採用反應蒸餾塔（RD）進行酯化反應和萃取蒸餾塔（ED）分離副產物，提供了三種不同的製程設計，並使用Aspen Plus模擬。根據模擬結果進行經濟分析，得知生產成本的競爭性，與前人研究的滲透蒸發分離組態進行比較，為了解決薄膜壽命太短而使成本提高的問題，使用工業上技術成熟的萃取蒸餾塔組態，並考慮熱整合設計進一步降低能耗。製程內包含了反應段以及蒸餾段，反應段有一支反應蒸餾塔，分離段有兩支萃取蒸餾塔，產物是99 mol%的乳酸乙酯從反應蒸餾塔流出，多的反應物乙醇和副產物的水被送到分離段進行分離。此研究主要是針對反應蒸餾塔改良，使其更加高效且節能，同時減少寡聚物的生成，達到降低成本的目的，最具競爭力設計製程經過最適化後的年總成本為221.89 kUSD，比之前的滲透蒸發混合分離系統研究降低了21%的成本。

關鍵字

乳酸乙酯 ； 反應蒸餾 ； 萃取蒸餾 ； 程序設計 ； 最適化

並列摘要

This research builds a commercial scale ethyl lactate (L1E) production process, uses reactive distillation (RD) column proceeding esterification and extractive distillation (ED) columns separating byproducts. It provides three different designs and uses Aspen Plus software to simulate the processes. According to the details from simulation result, economic analysis let us know the competitive design, compares with pervaporation process design from former research. For solving the problem of short life of membranes to reduce the cost, the industrially mature technique, ED, is used. And further decrease the energy consumption by using thermally coupled method. These processes include two sections and three columns. One RD column in reaction section and two ED columns in separation section. The product is 99 mol% L1E from RD column, and excess ethanol with generated water sent to ED columns to reuse. Mainly modify RD column to more efficient and energy-saving to achieve the purpose of reducing cost. The total annual cost of most competitive design is 221.89 kUSD, which reduces 21% cost than former pervaperation research.

並列關鍵字

Ethyl lactate ； Reactive distillation ； Extractive distillation ； Process design ； Optimization

參考文獻

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