Table 4.
Comparison of key results for different solvent processes
| Properties | Solvent | ||
|---|---|---|---|
| Benzene | Toluene | Butyl chloride | |
| Condenser duty (kW) | 5576 | 11,508 | 6995 |
| Energy requirement saving in condenser (%) | 51.5 | – | 39.2 |
| Reboiler duty (kW) | 6476 | 11,354 | 8326 |
| Energy requirement saving in reboiler (%) | 43.0 | – | 26.7 |
| Investment cost (k$/year) | 2761 | 3640 | 3018 |
| Investment cost saving (%) | 24.1 | – | 17.1 |
| Annual operating cost (k$/year) | 1969 | 5004 | 3663 |
| Annual operating cost saving (%) | 60.7 | – | 26.8 |
| Total annual cost (k$/year) | 2380 | 5547 | 4113 |
| Total annual cost saving (%) | 57.1 | – | 25.9 |
| Total annual CO2 emission (ton/year) | 13,923 | 24,411 | 17,901 |
| Total annual CO2 reduction (%) | 43.0 | – | 26.7 |