Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 242, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.116836
Keywords
Heteroazeotropic distillation; Pressure-swing distillation; Process intensification; Dividing-wall column; Vapor recompression
Categories
Funding
- National Natural Science Foundation of China [21878178]
- Postgraduate Science and Technology Innovation Project of Shandong University of Science and Technology [SDKDYC190214]
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The isopropanol stream obtained by direct hydration of propylene is mainly the diisopropyl ether-isopropanol-water ternary mixture with a low concentration and multiple azeotropes that leads to high energy usage for downstream isopropanol processing. For this, a new three-column heteroazeotropic and pressure-swing coupling distillation process (TCHPSD) is proposed and further intensified by employing dividing-wall column (DWC) and vapor recompression (VRC) technologies, resulting in two energy-efficient processes (TCHPSD-DWC, TCHPSD-DWC-VRC). Rigorous simulations and a dual-staged sequential iterative method are used in the design and optimization of processes. The results show that the TCHPSD-DWC-VRC process achieves a significant reduction in total annual costs (12.0%) and energy consumptions (63.8%) in comparison with the TCHPSD process. Furthermore, thermodynamic and environmental evaluations based on exergy efficiency, pinch analysis and CO2 emissions display that this double-effect intensified process is industrially sustainable, especially for industrial sites without access to cheap heat sources.
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