高純度異丙醇蒸餾最佳化設計之實場驗證與控制策略

本研究是以共沸塔A/B去瓶頸化為主軸，其變更內容包括硬體變更(修改塔內件)以及製程操作變更(進料/側流位置修改以及操作條件的變更)，以探討去瓶頸化後之生產成效及節能效益。過往工廠為了提高產能，卻忽略了設備負荷是否可合於標準。也因如此每每在製程過程中，總是遇上瓶頸，為了能突破去瓶頸化，使異丙醇製程更加流暢且純度提高，故本研究以共沸塔A/B去瓶頸化為主軸，配合專家進行蒸餾模擬並由本研究驗證。於資料顯示，因共沸塔A/B塔內件老舊且進料板數有異，特將內件更新、增加填充料高度並配合最佳進料板數，可使操作成本最小化。結果証實此設計方案可獲得高純度的異丙醇並同時具有穩定之蒸餾塔操作，藉此可作為未來相關的異相共沸蒸餾系統之控制系統與設計上之參考。最後，將製程之最適化條件，進行實場驗證，估算其節能效益約有每年可節省1,200萬以上蒸汽費用。節能效益取決於更換填充物。更換填充物可增加的理論板數，其板數越多，相對回流比可調降，節能就更明顯。

關鍵字

異丙醇；蒸餾系統；共沸塔

並列摘要

This study is to resolve the process bottleneck at an azeotropic column in order to accomplish the scale-up; the debottlenecking strategies was proposed. An azeotropic column is used to separate isopropanol and water; previous experiences said that, in order to increase capacity more than 100%, all flows were simply adjusted accordingly without consideration of individual equipment performance; often a point was therefore reached where product quality became lower and energy consumption was too high; that caused a tremendous operating cost loss for a long time. In order to find out the process scale-up solution, experts distillation simulation was called first, and then real field verification and new control strategies of this work were proposed. During column operations, when seeking the best operating conditions and energy efficiencies, increasing mass transfer efficiencies become necessary; there are a variety of process adjustments was introduced including hardware replacement (column internal packing material replacement) and process condition changes (feed position adjustments, operating condition changes and control strategies upgradation). The process performance was evaluated in terms of production rate with quality and column energy efficiencies. This study based on simulation results and the adjustments demonstrated that high purity of isopropyl alcohol and a stable operation of the distillation column with high throughput were reached. A real field validation estimated of its energy saving up to at least 12 million NT/year.

並列關鍵字

Iisopropyl alcohol ； Distillation ； Azeotropic column

參考文獻

1. Abrams, D, S. and Prausnitz, J, M., “Statiatical Thermodynamics of Liquid Mixtures: A NEW Expression for the Excess Gibbs Energy of Partly or Completely Miscible System”, AIChE J., 21, 116, 1975.

2. Aspen Plus, “Steady State Simulation”, Version 10.0, Aspen Technology, Inc. (1998).

7. Gmehling, J. and Onken, U., “Vapor-Liquid Equilbrium Data, Collection Aqueous Organic System”, DECHEMA Chemistry Data Series; DECHEMA:Frankfurt; Vol. 1, Part 1, 1977.

8. Lien, H.L. and Zhang, W.Z., “Removel of methyl tert-butyl ether(MTBE) wuth Nafion”, Journal of Hazardous Materials, vol. 114, pp. 194-199, 2007.

10. Ramachandran; R. D., Loc, H., “Process for the Production of Ethanol and Iaopropanol”, US Patent No, 5,488,185, 1996

國際替代計量

高純度異丙醇蒸餾最佳化設計之實場驗證與控制策略

全文下載

主題瀏覽