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Table 3 Economic evaluation of the proposed butyric acid recovery process

From: Energy-efficient recovery of fermented butyric acid using octyl acetate extraction

Variable Extractor Dist. I Dist. II Dist. III
Investment
 Column 0.247 0.128 0.094 0.055
 Tray 0.015 0.006 0.004 0.002
 Reboiler   0.078 0.032 0.009
 Condenser   0.069 0.061 0.022
 Preheater/cooler 0.123 0.083 0.003 0.001
Subtotal 0.385 0.364 0.194 0.089
Total     1.032
Utility
 Steam   0.209 0.052 0.007
 Coolant   0.002 0.002 0.001
Subtotal   0.211 0.054 0.008
Total     0.273
  1. The units are in million U.S. dollars and the utility cost is given per annum