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3.4.2.2 Melt Crystallization

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The differences in the melting points for D‐ or L‐lactide and the meso‐lactide can be used for separating the different lactides from each other and from other impurities. Crystallization of lactide from the melt has been described as a three‐step industrial process including crystallization–sweating–melting [102]. The process can also be combined with other lactide manufacturing techniques to improve the lactide quality. Another process is described as an integrated process for the manufacture of purified lactide, where the final step requires that the concentrated lactide is subjected to melt crystallization to separate lactide fractions [103].

Poly(lactic acid)

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