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An integrated process for the valorization of corn stover promoted by NaCl in GVL/H2O system

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JournalGreen Chemistry
DateSubmitted - 27 Oct 2021
DateAccepted/In press - 12 Jan 2022
DateE-pub ahead of print (current) - 12 Jan 2022
Early online date12/01/22
Original languageEnglish

Abstract

An integrated green process for the valorization of corn stover promoted by NaCl in GVL/H2O was developed. With the addition of NaCl in 25% GVL/H2O at 170 °C for 2 h, the interactions of NaCl (Na+ and Cl-) with -OH group in hemicellulose and G units in lignin were enhanced, which facilitated a high extraction of hemicellulose (96.4 wt%) and lignin (86.6 wt%), obtaining cellulose-rich solid residues. NaCl promoted the extracted hemicellulose degradation to produce small molecular products (85.6%). NaCl also promoted the cleavage of β-O-4′ linkages and decarboxylation reaction in lignin to obtain lower Mw (438 Da) oligomers and monophenols (14.2%) with high selectivity of 81.9% to 4-vinylphenol, 4-vinyl guaiacol and isoeugenol. Due to the salt effects of NaCl, the generated liquid products derived from hemicellulose and lignin were in situ separated by respectively dissolving into the aqueous and the GVL phase, which provided a possibility for further utilization. Additionally, the obtained cellulose-rich solid residues were activated by steam to prepare high performance activated carbon (SBET=819 m2/g, AMethylene blue=212 mg/g and AIodine=914mg/g), which showed great potential for pollution control within many industrial processes. This opened an avenue to integrate the valorization of corn stover.

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© Royal Society of Chemistry 2022. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

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