Table 7. Controllability Indices and Desirability and Values for the Systems.
| extractive distillation | pressure swing distillation | |||||||
|---|---|---|---|---|---|---|---|---|
| purity of THF | 95 mol % | 99.9 mol % | 95 mol % | 99.9 mol % | ||||
| control structure | R1-R2-Q2 | L1-L2-Q2 | R1-R2-Q2 | L1-L2-Q2 | R1-R2 | Q1-Q2 | R1-R2 | Q1-Q2 |
| time constant (h) | 0.41 h | 0.41 h | 0.45 h | 0.45 h | 0.13 h | 0.13 h | 0.3 h | 0.3 h |
| frequency (rad/s) | 6.68 × 10–4 | 6.68 × 10–4 | 6.68 × 10–4 | 6.68 × 10–4 | 2.14 × 10–3 | 2.14 × 10–3 | 9.26 × 10–4 | 9.26 × 10–4 |
| MRI | 4.73 × 10–3 | 5.17 × 10–3 | 1.44 × 10–3 | 1.41 × 10–3 | 5.44 × 10–3 | 1.44 × 10–1 | 1.72 × 10–4 | 5.01 × 10–3 |
| CN | 5.17 × 103 | 3.51 × 103 | 5.00 × 103 | 3.42 × 103 | 1.43 × 101 | 3.19 × 100 | 2.47 × 102 | 5.01 × 101 |
| RGAno | 3.74 × 102 | 2.59 × 102 | 6.01 × 102 | 4.13 × 102 | 9.69 × 100 | 9.81 × 10–1 | 7.10 × 101 | 1.59 × 101 |
| dMRI | 4.62 × 10–2 | 5.04 × 10–2 | 1.43 × 10–2 | 1.40 × 10–2 | 5.30 × 10–2 | 7.62 × 10–1 | 1.72 × 10–3 | 4.89 × 102 |
| dCN | 1.96 × 10–16 | 2.19 × 10–11 | 6.21 × 10–16 | 4.09 × 10–11 | 9.04 × 10–1 | 9.78 × 10–1 | 1.78 × 10–1 | 7.04 × 10–1 |
| dRGAno | 5.50 × 10–17 | 5.70 × 10–12 | 8.08 × 10–27 | 1.13 × 10–18 | 3.79 × 10–1 | 9.07 × 10–1 | 8.26 × 10–4 | 2.05 × 10–1 |
| aggregated desirability | 7.92 × 10–12 | 1.85 × 10–8 | 4.16 × 10–15 | 8.66 × 10–11 | 2.63 × 10–1 | 8.77 × 10–1 | 6.32 × 10–3 | 1.92 × 10–1 |