Table 5 Overall utilities used in ethanol making process using dilute acid and dilute alkali pretreatment (2010 prices)
| Â | Dilute Acid | Dilute Alkali | ||||
|---|---|---|---|---|---|---|
Utility | Amount (kg/L EtOH) | Annual cost $ (%) | Cost (¢/L EtOH) | Amount (kg/L EtOH) | Annual cost $ (%) | Cost (¢/L EtOH) |
Electricity (KWh)a | 0.56 | 2334792 (55.4) | 3.91 | 0.52 | 2163214 (53.5) | 3.64 |
Steam | 5.91 | 0 | 0.00 | 5.82 | 0 | 0.00 |
Cooling Water | 500.24 | 1492305 (35.4) | 2.50 | 500.50 | 1488313 (36.8) | 2.50 |
Chilled Water | 0.73 | 17367 (0.4) | 0.03 | 0.84 | 19977 (0.5) | 0.03 |
CT Water | 88.76 | 370702 (8.8) | 0.62 | 89.04 | 370702 (9.2) | 0.62 |
Steam (High P) | 0.42 | 0 | 0.00 | 0.42 | 0 | 0.00 |