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Table 2 Ethanol concentration (%) obtained at different concentration of H2SO4 used for hydrolysis and at different fermentation time

From: Bio-ethanol production from wet coffee processing waste in Ethiopia

Fermentation time (h) 0.2 M H2SO4 0.4 M H2SO4 0.6 M H2SO4 0.8 M H2SO4 1 M H2SO4 Distilled water
Ethanol concentration (%)
 12 50 58.5 56.3 54.2 45.8 29.7
 24 68.7 78.0 75.5 70.4 63.5 29.8
 36 67.1 74.4 67.4 64.4 63.5 27.8
 48 53.1 71.3 65.3 61.7   
  1. The results were obtained at optimized temperature, time and initial pH (100 °C, 1 h and pH of 4.5)