Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 312, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2023.123360
Keywords
Pressure-swing distillation; Process electrification; Heat pump assisted distillation; Self-heat recuperation technology; Dynamics and control
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Pressure-swing distillation (PSD) is an effective technique for separating pressure-sensitive azeotropes. By employing heat pump assisted distillation (HPAD) and self-heat recuperation technology (SHRT), PSD can be electrically driven and exhibit significant economic advantages. However, the integration of electrical components may introduce dynamic control challenges.
Pressure-swing distillation (PSD) is a typical thermal-driven technique for separating pressure-sensitive azeo-tropes. By implementing heat pump assisted distillation (HPAD) and self-heat recuperation technology (SHRT), the process can be modified as an electrical-driven one. Previous works have verified the overwhelming steady-state economic advantages of electrified PSDs over a conventional design. However, highly integrated electrified processes could jeopardize the dynamics and controllability. In light of potential dynamic control issues, a demonstrating case of a maximum-boiling acetone/chloroform azeotrope featuring a small pressure-induced shift was studied. Severe snowball effects were observed in these complicated electrified systems. To maintain process stability under throughput and composition disturbances, several robust control structures based on decentral-ized proportional-integral feedback controllers were developed. These control structures feature temperature controllers with no composition measurement. The results indicate that there is no conflict between the steady-state advantage and dynamic controllability. Therefore, considering the great advantages in economic and environmental aspects of electrified PSD, it is encouraged to extend process electrification measures to other distillation processes.
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