Simultaneous optimization of the feed location and thermodynamic feed conditions for a distillation column based on column grand composite curves

doi:10.16511/j.cnki.qhdxxb.2016.24.020

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Abstract The study used the column grand composite curve (CGCC) method to simultaneously optimize the feed location and feed conditions for a distillation column to reduce the total utility costs. The CGCC method based on the near-minimum thermodynamic condition (PNMTC) can be decomposed into two theoretical curves for the overall rectifying and overall stripping curves. The intersection point O of the two theoretical curves is not only the ideal feed point, but also the partitioning point for the amount of feed preheating. The total cost of the cold and hot utilities is used as the objective function to optimize the feed preheating and to identify the intersection point location O. The optimal feed location in the distillation column is then found using the enthalpy difference, ΔH_{n, def}, between the intersection point and the actual feed point. The feed location and the feed conditions are then optimized using the CGCC curves. A benzene and toluene column was used to evaluate the accuracy of this graphic method. The maximum savings for the cold and hot utilities is about 1.24 RMB/h. The feed preheating is 1.98 MW and the enthalpy difference, ΔH_{n, def}, is 0.038 MW. The optimal feed location is the 21^th stage. The CGCC results compare well with Aspen Plus results with differences only 1%-3%.

Keywords feed location feed conditions graphical method Aspen Plus costs

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Issue Date: 15 July 2016

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	LIU Xuegang
	ZHANG Bingjian
	CHEN Qinglin

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LIU Xuegang,ZHANG Bingjian,CHEN Qinglin. Simultaneous optimization of the feed location and thermodynamic feed conditions for a distillation column based on column grand composite curves[J]. Journal of Tsinghua University(Science and Technology), 2016, 56(7): 700-706.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2016.24.020 OR http://jst.tsinghuajournals.com/EN/Y2016/V56/I7/700

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