Table 5.

Computational outputs from the PSO for the future mode (Three intervals).

	[Recycle amount (kg/s), Bottom operating pressure of deethanizer (MPaa), Bottom operating pressure of debutanizer (MPaa)]
	First Interval [12.3–23, 0.43–0.85, 0.5–0.6]
	Execution number
	1	2	3	4	5
Optimum recycled flowrate (kg/s)	12.3	12.3	12.3	12.3	12.3
Optimum bottom operating pressure for deethanizer(MPaa)	0.85	0.85	0.85	0.85	0.85
Optimum bottom operating pressure for debutanizer (MPaa)	0.5	0.5	0.5	0.5	0.5
TAC (1000 USD/year)	1141.72	1141.65	1141.59	1141.70	1141.69
CPU time (s)	5489	5479	5480	5488	5488
Function evaluations	660	660	660	660	660

	Second Interval [10.2–12.3, 0.62–0.87, 0.5–0.55]
	Execution number
	1	2	3	4	5
Optimum recycled flowrate (kg/s)	10.2	10.2	10.2	10.2	10.2
Optimum bottom operating pressure for deethanizer (MPaa)	0.864	0.864	0.864	0.864	0.864
Optimum bottom operating pressure for debutanizer (MPaa)	0.55	0.55	0.55	0.55	0.55
TAC (1000 USD/year)	1130.37	1130.40	1130.45	1130.36	1130.37
CPU time (s)	2089	2080	2081	2089	2089
Function evaluations	660	660	660	660	660

	Third Interval [10–10.2, 0.86–0.87, 0.55–0.55]
	Execution number
	1	2	3	4	5
Optimum recycled flowrate (kg/s)	10	10	10	10	10
Optimum bottom operating pressure for deethanizer (MPaa)	0.866	0.866	0.866	0.866	0.866
Optimum bottom operating pressure for debutanizer (MPaa)	0.55	0.55	0.55	0.55	0.55
TAC (1000 USD/year)	1118.2	1118.2	1118.2	1118.2	1118.2
CPU time (s)	2268	2267	2268	2260	2268
Function evaluations	660	660	660	660	660