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題名 | Control of Isopropyl Alcohol Dehydration System: Case with Single Temperature Break in Azeotropic Column=異丙醇脫水製程之控制:共沸蒸餾塔內溫度分佈僅有單一陡變區之例子 |
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作者 | 錢義隆; 曾楷倫; 趙桓易; 鄧耀斌; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 35:3 2004.05[民93.05] |
頁次 | 頁267-283 |
分類號 | 460.026 |
關鍵詞 | 異丙醇; 脫水製程; 共沸蒸餾塔; 溫度; 陡變區; Heterogeneous azeotropic distillation; Isopropyl alcohol dehydration; Azeotropic column control; Plantwide control; Controller pairing; |
語文 | 英文(English) |
中文摘要 | 在這篇論文中主要是探討工業級異丙醇脫水製程之最佳控制策略。半導體製程中常會產生大量異丙醇廢液必須回收處理,一般作法是先用一前置蒸餾塔將廢液提純至異丙醇與水之共沸點附近,然後再加入一共沸劑以分離出高純度之異丙醇回收使用。本論文是探討以環己烷爲共沸劑之共沸蒸餾塔及後續回收塔之完整迴流製程之控制。在先前之研究中,超高純度異丙醇(組成高過99.999莫耳百分率)之最佳操作條件被探討,此操作條件中共沸蒸餾塔的溫度分佈會有兩個陡變區。本篇論文將異丙醇產物之純度設在合理之99.9莫耳百分率,如此求得之最佳操作條件,其中共沸蒸餾塔內的溫度和純度分佈與前研究結果甚爲不同,塔內溫度分佈將不再有兩個陡變區而僅有一個陡變區。本製程之最佳控制策略在共沸蒸餾塔將使用顛倒配對之兩點溫度控制,而在後續回收塔中則使用較簡單之單點溫度控制。本研究所提出之完整製程的最佳控制策略在進料流量及進料組成的干擾下,均能保持異丙醇產物及廢水之高純度。 |
英文摘要 | Semi-conductor manufacturers in Taiwan often produce large amount of waste solution containing isopropyl alcohol (IPA) and water (H₂O). In order to purify IPA, a simple pre-purification column is used first to purify the waste solution into the azeotropic composition of IPA and H₂O. Then, an entrainer is added to further separate into high purity IPA product and waste water. In this work, control of an industrial scale complete heterogeneous azeotropic distillation column system of isopropyl alcohol (IPA) + water(H₂O)with cyclohexane (CyH)as an entrainer is investigated. The complete system includes a heterogeneous azeotropic column, an additional recycle column, a decanter, and a recycle stream from the recycle column back to the azeotropic column. In early study of this system, the IPA product purity at the bottom of the azeotropic column is specified to be ultra pure with over 99.999 mol% IPA. The temperature profile of the azeotropic column for this ultra pure separation is characterized by two temperature breaks inside the column. In this paper, the IPA product purity is relaxed to specify at 99.9 mol%. With this purity, the temperature profile and the route of the composition profile for the azeotropic column is completely different than the previous case. The suitable overall control strategy of this complete heterogeneous azeotropic distillation column system has been studied extensively in this paper. From process analysis and dynamic simulation, the overall control strategy is developed which requires reverse-paired two temperature loops in the first column and one temperature loop in the second column. The overall control strategy is tested with composition and flow rate variations in the fresh feed stream. The specifications of the IPA product and waste water stream with both purities at 99.9 mol% can be met despite various disturbance changes. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。