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Table 4 The comparison of various pretreatment methods for JAS

From: The advanced strategy for enhancing biobutanol production and high-efficient product recovery with reduced wastewater generation

Pretreatment Parameters Water washinga (g/g-JAS) Sugars yield (g/g-JAS) Comments Refs.
Alkali 2% (w/v) NaOH, 121 °C, 1 h, washing to neutral pH >240 0.23 A large amount of water for neutralization [29]
Acid/alkali 0.5 % (v/v) H2SO4, 121 °C, 1 h/4% (w/v) NaOH, 121 °C, 1 h, washing to neutral pH >260 0.33 A large amount of water for neutralization, high sugars yield, high energy cost [30]
Acid 1% (v/v) H2SO4, 130 °C, 1.5 h Low sugars yield, water saving [31]
Acid 0.5% (v/v) H2SO4, 121 °C, 1 h 0.18 Low sugars yield, water saving [32]
Alkali 4% (w/v) NaOH, 121 °C, 1 h washing to neutral pH >260 0.26 A large amount of water for neutralization, high sugars yield [32]
Alkali/peroxide 2% (w/v) NaOH–6% (v/v) H2O2, 121 °C, 1 h, washing to pH 8.8 45 0.27 Water saving, high sugars yield This work
  1. aWater utilization was calculated based on NaOH removal and neutralization
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