期刊
SCIENCE
卷 349, 期 6243, 页码 78-80出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa7169
关键词
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资金
- Research Foundation-Flanders (FWO)
- Belgian American Educational Foundation
- Research Council of KU Leuven [IDO KP/14/003]
Biodegradable and renewable polymers, such as polylactic acid, are benign alternatives for petrochemical-based plastics. Current production of polylactic acid via its key building block lactide, the cyclic dimer of lactic acid, is inefficient in terms of energy, time, and feedstock use. We present a direct zeolite-based catalytic process, which converts lactic acid into lactide. The shape-selective properties of zeolites are essential to attain record lactide yields, outperforming those of the current multistep process by avoiding both racemization and side-product formation. The highly productive process is strengthened by facile recovery and practical reactivation of the catalyst, which remains structurally fit during at least six consecutive reactions, and by the ease of solvent and side-product recycling.
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