Purification of lactide by deep eutectic solvent assisted phase-change extraction technology.
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| Title: | Purification of lactide by deep eutectic solvent assisted phase-change extraction technology. |
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| Authors: | Yu, Jiaming1,2,3 (AUTHOR), Xia, Xuanfeng3 (AUTHOR), Lei, Chuang1 (AUTHOR), Zhu, Jianluo1,3 (AUTHOR) hnlyzjl0379@163.com, Yu, Yanling1,2 (AUTHOR) yuyanling@hit.edu.cn |
| Source: | Separation & Purification Technology. Nov2025, Vol. 372, pN.PAG-N.PAG. 1p. |
| Subjects: | Phase transitions, Carbon emissions, Molecular clusters, Lactic acid, Amides, Choline chloride |
| Abstract: | Impurities such as lactic acid and its oligomers in crude lactide (LT) significantly impair the quality of polylactide products. This study introduces a novel deep eutectic solvent assisted phase-change extraction (DES-PCE) method for efficient LT purification. By forming deep eutectic solvents (DESs) through the interaction of amides and acids, this method enables the separation of acid impurities during a temperature-driven phase transition, where LT crystallizes and impurities remain in the liquid phase. Centrifugation of the mixture yields high-purity LT, with N,N -Dimethylformamide (DMF) identified as the optimal amide, enhancing LT purity from 83.82% to 99.91% while achieving a yield of 95.97%. Mechanistic studies using FT-IR, NMR, and quantum chemical calculations elucidate the formation and function of DESs, as well as their impact on solubility and viscosity. Compared to conventional distillation, the DES-PCE process significantly reduces energy consumption and carbon dioxide emissions by 91% and 94%, respectively, showcasing its potential as a sustainable and cost-effective solution for LT purification. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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