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The swelling induced choline alkali-urea (SICAU) process for sustainable crop straw upgrading

[Display omitted] •The swelling induced choline alkali-urea process realized complete rice straw fractionation.•23.7 g lignin-carbohydrate complex was co-produced from 100 g rice straw.•The spent choline alkali-urea was regenerated into choline chloride-urea after XOSs recovery.•The choline alkali-u...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-01, Vol.479, p.147610, Article 147610
Main Authors: Jiang, Yuehan, Shen, Feiyue, Jiang, Baiheng, Hu, Yuheng, Hu, Jinguang, Huang, Mei, Zhao, Li, Wu, Hejun, Tian, Dong, Shen, Fei
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cited_by cdi_FETCH-LOGICAL-c297t-4bcce212b6e724b1a80b7aa87d4be9d4daa3d24db18cf1f9117696fcfb45cf233
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container_title Chemical engineering journal (Lausanne, Switzerland : 1996)
container_volume 479
creator Jiang, Yuehan
Shen, Feiyue
Jiang, Baiheng
Hu, Yuheng
Hu, Jinguang
Huang, Mei
Zhao, Li
Wu, Hejun
Tian, Dong
Shen, Fei
description [Display omitted] •The swelling induced choline alkali-urea process realized complete rice straw fractionation.•23.7 g lignin-carbohydrate complex was co-produced from 100 g rice straw.•The spent choline alkali-urea was regenerated into choline chloride-urea after XOSs recovery.•The choline alkali-urea exhibited high ability of hydrogen bonding network disruption. Upgrading lignocellulosic biomass into value-added product forms has been attractive but challenged by its structural recalcitrance and heterogeneity. Prevalent fractionation techniques employ aggressive chemical solvents or catalysts to cleave lignin-carbohydrates bonds with the purpose of dissolution ability enhancement. This work tailored the swelling induced choline alkali-urea (SICAU) process to fractionate rice straw with the powerful choline alkali-urea (ChOH-Ur) deep eutectic solvents (DES) with the preservation of lignin-carbohydrates bonds, thus the super high yield of high-value lignin-carbohydrates complexes (LCCs) was co-produced together with highly hydrolysable cellulose and ethanol-insoluble xylooligosaccharides (XOSs) fractions. Results showed that rather high cellulose recovery (87.3 %-100 %) was obtained with nearly 100 % cellulose to glucose conversion. Optimized LCCs yield of 34.3 % was achieved with 50 % choline alkali-urea concentration and 4 h cooking time, along with the corresponding yield of 10.2 % XOSs during the DES conversion process. The LCCs linkages were 0.06–0.16/100 Ar depending on cooking conditions. The proposed integrated SICAU process realized the complete upgrading of rice straw into three value-added products, which showed a very different working profile with prevalent systems that usually fractionated lignocellulose into cellulose, lignin, and hemicellulose. Therefore, the SICAU process could extract higher value from lignocellulose towards a more sustainable lignocellulose biorefinery.
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Upgrading lignocellulosic biomass into value-added product forms has been attractive but challenged by its structural recalcitrance and heterogeneity. Prevalent fractionation techniques employ aggressive chemical solvents or catalysts to cleave lignin-carbohydrates bonds with the purpose of dissolution ability enhancement. This work tailored the swelling induced choline alkali-urea (SICAU) process to fractionate rice straw with the powerful choline alkali-urea (ChOH-Ur) deep eutectic solvents (DES) with the preservation of lignin-carbohydrates bonds, thus the super high yield of high-value lignin-carbohydrates complexes (LCCs) was co-produced together with highly hydrolysable cellulose and ethanol-insoluble xylooligosaccharides (XOSs) fractions. Results showed that rather high cellulose recovery (87.3 %-100 %) was obtained with nearly 100 % cellulose to glucose conversion. Optimized LCCs yield of 34.3 % was achieved with 50 % choline alkali-urea concentration and 4 h cooking time, along with the corresponding yield of 10.2 % XOSs during the DES conversion process. The LCCs linkages were 0.06–0.16/100 Ar depending on cooking conditions. The proposed integrated SICAU process realized the complete upgrading of rice straw into three value-added products, which showed a very different working profile with prevalent systems that usually fractionated lignocellulose into cellulose, lignin, and hemicellulose. Therefore, the SICAU process could extract higher value from lignocellulose towards a more sustainable lignocellulose biorefinery.</description><identifier>ISSN: 1385-8947</identifier><identifier>EISSN: 1873-3212</identifier><identifier>DOI: 10.1016/j.cej.2023.147610</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Alkaline deep eutectic solvent ; Cellulose hydrolysis ; Lignin- carbohydrate complexes ; Lignocellulose ; Swelling</subject><ispartof>Chemical engineering journal (Lausanne, Switzerland : 1996), 2024-01, Vol.479, p.147610, Article 147610</ispartof><rights>2023 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c297t-4bcce212b6e724b1a80b7aa87d4be9d4daa3d24db18cf1f9117696fcfb45cf233</citedby><cites>FETCH-LOGICAL-c297t-4bcce212b6e724b1a80b7aa87d4be9d4daa3d24db18cf1f9117696fcfb45cf233</cites><orcidid>0000-0001-5951-635X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Jiang, Yuehan</creatorcontrib><creatorcontrib>Shen, Feiyue</creatorcontrib><creatorcontrib>Jiang, Baiheng</creatorcontrib><creatorcontrib>Hu, Yuheng</creatorcontrib><creatorcontrib>Hu, Jinguang</creatorcontrib><creatorcontrib>Huang, Mei</creatorcontrib><creatorcontrib>Zhao, Li</creatorcontrib><creatorcontrib>Wu, Hejun</creatorcontrib><creatorcontrib>Tian, Dong</creatorcontrib><creatorcontrib>Shen, Fei</creatorcontrib><title>The swelling induced choline alkali-urea (SICAU) process for sustainable crop straw upgrading</title><title>Chemical engineering journal (Lausanne, Switzerland : 1996)</title><description>[Display omitted] •The swelling induced choline alkali-urea process realized complete rice straw fractionation.•23.7 g lignin-carbohydrate complex was co-produced from 100 g rice straw.•The spent choline alkali-urea was regenerated into choline chloride-urea after XOSs recovery.•The choline alkali-urea exhibited high ability of hydrogen bonding network disruption. Upgrading lignocellulosic biomass into value-added product forms has been attractive but challenged by its structural recalcitrance and heterogeneity. Prevalent fractionation techniques employ aggressive chemical solvents or catalysts to cleave lignin-carbohydrates bonds with the purpose of dissolution ability enhancement. This work tailored the swelling induced choline alkali-urea (SICAU) process to fractionate rice straw with the powerful choline alkali-urea (ChOH-Ur) deep eutectic solvents (DES) with the preservation of lignin-carbohydrates bonds, thus the super high yield of high-value lignin-carbohydrates complexes (LCCs) was co-produced together with highly hydrolysable cellulose and ethanol-insoluble xylooligosaccharides (XOSs) fractions. Results showed that rather high cellulose recovery (87.3 %-100 %) was obtained with nearly 100 % cellulose to glucose conversion. Optimized LCCs yield of 34.3 % was achieved with 50 % choline alkali-urea concentration and 4 h cooking time, along with the corresponding yield of 10.2 % XOSs during the DES conversion process. The LCCs linkages were 0.06–0.16/100 Ar depending on cooking conditions. The proposed integrated SICAU process realized the complete upgrading of rice straw into three value-added products, which showed a very different working profile with prevalent systems that usually fractionated lignocellulose into cellulose, lignin, and hemicellulose. 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Upgrading lignocellulosic biomass into value-added product forms has been attractive but challenged by its structural recalcitrance and heterogeneity. Prevalent fractionation techniques employ aggressive chemical solvents or catalysts to cleave lignin-carbohydrates bonds with the purpose of dissolution ability enhancement. This work tailored the swelling induced choline alkali-urea (SICAU) process to fractionate rice straw with the powerful choline alkali-urea (ChOH-Ur) deep eutectic solvents (DES) with the preservation of lignin-carbohydrates bonds, thus the super high yield of high-value lignin-carbohydrates complexes (LCCs) was co-produced together with highly hydrolysable cellulose and ethanol-insoluble xylooligosaccharides (XOSs) fractions. Results showed that rather high cellulose recovery (87.3 %-100 %) was obtained with nearly 100 % cellulose to glucose conversion. Optimized LCCs yield of 34.3 % was achieved with 50 % choline alkali-urea concentration and 4 h cooking time, along with the corresponding yield of 10.2 % XOSs during the DES conversion process. The LCCs linkages were 0.06–0.16/100 Ar depending on cooking conditions. The proposed integrated SICAU process realized the complete upgrading of rice straw into three value-added products, which showed a very different working profile with prevalent systems that usually fractionated lignocellulose into cellulose, lignin, and hemicellulose. Therefore, the SICAU process could extract higher value from lignocellulose towards a more sustainable lignocellulose biorefinery.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.cej.2023.147610</doi><orcidid>https://orcid.org/0000-0001-5951-635X</orcidid></addata></record>
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subjects Alkaline deep eutectic solvent
Cellulose hydrolysis
Lignin- carbohydrate complexes
Lignocellulose
Swelling
title The swelling induced choline alkali-urea (SICAU) process for sustainable crop straw upgrading
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