C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 319/12 (2006.01) C08J 5/18 (2006.01) C08L 67/04 (2006.01) C09D 167/04 (2006.01)
Patent
CA 2091691
2091691 9205167 PCTABS00011 The present invention is directed to a method for making L-lactide (LD) from aqueous L-lactic acid. Aqueous lactic acid feed for present purposes comprehends an aqueous mixture of one or more of lactic acid, lactic acid dimer, and lactic acid trimer optionally with LD being present. L-lactic acid is the preferred feed configuration for making L-lactide, and is to be understood even though the configuration symbol is not used throughout this application. Aqueous lactic acid feed is treated for removal of water therefrom until a degree of polymerization (DP) not substantially above about 2 is reached. The treatment then is ceased to produce a crude LD product. LD then is separate from the crude LD product. A preferred treatment involves heating the feed at elevated temperature to remove water. LD can be separated from the crude LD product by a variety of techniques to produce an LD-depleted product. This LD-depleted product, optionally augmented with additional aqueous lactic acid and/or water then can be readmitted to the process for making additional lactide. This cyclic or recycle process embodiment of the present invention enables very high lactide conversions to be realized.
Markle Richard A.
Sinclair Richard G.
Smith Russell K.
Biopak Technology Ltd.
Sim & Mcburney
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