STUDY ON PRETREATMENT OF GLYCYRRHIZA RESIDUE WITH DEEP EUTECTIC SOLVENTS

Chen Xiaoyan; Wang Fan; Wang Yanling; Yu Qiang; Wang Zhongming; Yuan Zhenhong

doi:10.19912/j.0254-0096.tynxb.2021-0673

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (12) : 446-452. DOI: 10.19912/j.0254-0096.tynxb.2021-0673

STUDY ON PRETREATMENT OF GLYCYRRHIZA RESIDUE WITH DEEP EUTECTIC SOLVENTS

Chen Xiaoyan¹, Wang Fan^1,2, Wang Yanling¹, Yu Qiang³, Wang Zhongming¹, Yuan Zhenhong¹

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Abstract

The solvent pretreatment of glycyrrhiza residue using deep eutectic solvents（DESs） as solvents with nine choline chloride（ChCl） as hydrogen bond donors was conducted. The effects of DESs compositions and treating conditions on chemical compositions and physical morphology were analyzed. Among alcohol DESs, glycol/ChCl shows maximal lignin removal rate of 38.33% under the pretreatment conditions of 150 ℃, 1 h. For the acidic DESs, maximal lignin removal rate of 40.87% with cellulose recovery of 95.28% is observed after the treatment by lactic acid/ChCl under the conditions of 100 ℃, 1 h. Among the basic DESs, the maximal lignin removal rate of 73.02% is achieved by ethanolamine/ChCl under the conditions of 150 ℃, 4 h. Physical characteristics analysis indicates that DES destroys intramolecular hydrogen bonds of cellulose, breaks the ester bonds between carbohydrate and lignin, increases the accessible surface area of cellulose, which is conducive for subsequent utilization.

Key words

waste utilization / lignocellulosic biomass / delignification / glycyrrhiza residue / deep eutectic solvent / physicochemical characteristics

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Chen Xiaoyan, Wang Fan, Wang Yanling, Yu Qiang, Wang Zhongming, Yuan Zhenhong. STUDY ON PRETREATMENT OF GLYCYRRHIZA RESIDUE WITH DEEP EUTECTIC SOLVENTS[J]. Acta Energiae Solaris Sinica. 2022, 43(12): 446-452 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0673

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