Butanol production from hydrothermolysis-pretreated switchgrass: quantification of inhibitors and detoxification of hydrolyzate

K Liu, HK Atiyeh, O Pardo-Planas, TC Ezeji, V Ujor… - Bioresource …, 2015 - Elsevier
Bioresource technology, 2015Elsevier
The present study evaluated butanol production from switchgrass based on
hydrothermolysis pretreatment. The inhibitors present in the hydrolyzates were measured.
Results showed poor butanol production (1 g/L) with non-detoxified hydrolyzate. However,
adjusting the pH of the non-detoxified hydrolyzate to 6 and adding 4 g/L CaCO 3 increased
butanol formation to about 6 g/L. There was about 1 g/L soluble lignin content (SLC), and
various levels of furanic and phenolic compounds found in the non-detoxified hydrolyzate …
Abstract
The present study evaluated butanol production from switchgrass based on hydrothermolysis pretreatment. The inhibitors present in the hydrolyzates were measured. Results showed poor butanol production (1 g/L) with non-detoxified hydrolyzate. However, adjusting the pH of the non-detoxified hydrolyzate to 6 and adding 4 g/L CaCO3 increased butanol formation to about 6 g/L. There was about 1 g/L soluble lignin content (SLC), and various levels of furanic and phenolic compounds found in the non-detoxified hydrolyzate. Detoxification of hydrolyzates with activated carbon increased the butanol titer to 11 g/L with a total acetone, butanol and ethanol (ABE) concentration of 17 g/L. These results show the potential of butanol production from hydrothermolysis pretreated switchgrass.
Elsevier
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