Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol

Wheat straw and eucalyptus residues were pretreated in a biphasic system, constituted of butanol (n-butanol) or 2-methyltetrahydrofuran (2M-THF) and aqueous oxalic acid solutions. The pretreatments were carried out in a 300 mL Parr reactor (Autoclave Buchi Limbo-li<sup>®</sup>) with a so...

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Autores principales:	Egidio Viola, Francesco Zimbardi, Massimo Morgana, Nadia Cerone, Vito Valerio, Assunta Romanelli
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	straw eucalyptus organosolv hydrolysis biobased economy Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7c8fccd8abe54c93ae9da67dfdbe708a
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spelling	oai:doaj.org-article:7c8fccd8abe54c93ae9da67dfdbe708a2021-11-25T18:51:48ZOptimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol10.3390/pr91120512227-9717https://doaj.org/article/7c8fccd8abe54c93ae9da67dfdbe708a2021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/2051https://doaj.org/toc/2227-9717Wheat straw and eucalyptus residues were pretreated in a biphasic system, constituted of butanol (n-butanol) or 2-methyltetrahydrofuran (2M-THF) and aqueous oxalic acid solutions. The pretreatments were carried out in a 300 mL Parr reactor (Autoclave Buchi Limbo-li<sup>®</sup>) with a solid load of 5 wt.%, the temperature in the range 140–180 °C, oxalic acid load from 0 to 10 wt.% and a duration of 30–90 min. The obtained slurry was then fractionated in three streams: the aqueous phase which contained solubilized hemicellulose, the organic phase which contained the solvated lignin, and the solid residue which contained cellulose. The solid was hydrolyzed using a commercial mix of enzymes to assess cellulose digestibility and glucose production. The pretreatment was optimized to maximize the purity of the cellulose and hemicellulose fractions and the glucose recovery as free sugar. The optimization was done by using an experimental design and response surface methodology. The mass flow details of the four optimized processes were obtained. In terms of biomass fractionation, butanol demonstrated significant advantages over 2M-THF in the same range of process conditions as shown by the recovery yield of free glucose which reached 98% of the theoretical value with butanol but was 67% with 2M-THF. Tests at low temperature and low enzyme loading highlighted the importance of the solvent choice over the operating conditions. 2M-THF showed interesting performances only in the delignification step, with 90% efficiency for the straw. Regarding the use of different feedstock, fractionation and recovery were generally higher for wheat straw than for eucalyptus wood residues.Egidio ViolaFrancesco ZimbardiMassimo MorganaNadia CeroneVito ValerioAssunta RomanelliMDPI AGarticlestraweucalyptusorganosolvhydrolysisbiobased economyChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 2051, p 2051 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	straw eucalyptus organosolv hydrolysis biobased economy Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	straw eucalyptus organosolv hydrolysis biobased economy Chemical technology TP1-1185 Chemistry QD1-999 Egidio Viola Francesco Zimbardi Massimo Morgana Nadia Cerone Vito Valerio Assunta Romanelli Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
description	Wheat straw and eucalyptus residues were pretreated in a biphasic system, constituted of butanol (n-butanol) or 2-methyltetrahydrofuran (2M-THF) and aqueous oxalic acid solutions. The pretreatments were carried out in a 300 mL Parr reactor (Autoclave Buchi Limbo-li<sup>®</sup>) with a solid load of 5 wt.%, the temperature in the range 140–180 °C, oxalic acid load from 0 to 10 wt.% and a duration of 30–90 min. The obtained slurry was then fractionated in three streams: the aqueous phase which contained solubilized hemicellulose, the organic phase which contained the solvated lignin, and the solid residue which contained cellulose. The solid was hydrolyzed using a commercial mix of enzymes to assess cellulose digestibility and glucose production. The pretreatment was optimized to maximize the purity of the cellulose and hemicellulose fractions and the glucose recovery as free sugar. The optimization was done by using an experimental design and response surface methodology. The mass flow details of the four optimized processes were obtained. In terms of biomass fractionation, butanol demonstrated significant advantages over 2M-THF in the same range of process conditions as shown by the recovery yield of free glucose which reached 98% of the theoretical value with butanol but was 67% with 2M-THF. Tests at low temperature and low enzyme loading highlighted the importance of the solvent choice over the operating conditions. 2M-THF showed interesting performances only in the delignification step, with 90% efficiency for the straw. Regarding the use of different feedstock, fractionation and recovery were generally higher for wheat straw than for eucalyptus wood residues.
format	article
author	Egidio Viola Francesco Zimbardi Massimo Morgana Nadia Cerone Vito Valerio Assunta Romanelli
author_facet	Egidio Viola Francesco Zimbardi Massimo Morgana Nadia Cerone Vito Valerio Assunta Romanelli
author_sort	Egidio Viola
title	Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
title_short	Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
title_full	Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
title_fullStr	Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
title_full_unstemmed	Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol
title_sort	optimized organosolv pretreatment of biomass residues using 2-methyltetrahydrofuran and n-butanol
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7c8fccd8abe54c93ae9da67dfdbe708a
work_keys_str_mv	AT egidioviola optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol AT francescozimbardi optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol AT massimomorgana optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol AT nadiacerone optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol AT vitovalerio optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol AT assuntaromanelli optimizedorganosolvpretreatmentofbiomassresiduesusing2methyltetrahydrofuranandnbutanol
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Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol

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