Use of cyclic carbonic acid esters as solvents for...

Details Use of cyclic carbonic acid esters as solvents for... Use of cyclic carbonic acid esters as solvents for...

C - Chemistry, Metallurgy

12

P

195/72

C12P 7/42 (2006.01) C08G 63/89 (2006.01) C12P 1/00 (2006.01) C12P 7/62 (2006.01)

Patent

CA 1091600

Abstract of the Disclosure The use of cyclic carbonic acid esters of the formula: Image wherein R1, R2, R3 and R4, which may be the same or different, are hydrogen or alkyl with 1 to 6 C-atoms, as a solvent for racemic or optically active poly-(.beta.- hydroxybutyric acid). The preferred embodiment uses hot (120 to 150°C) ethylene carbonate or 1,2-propylene carbonate to extract poly-.beta.-hydroxybutyric acid) from moist or dry fermentation masses. These solvents have the advantage that the extracted poly-(.beta.-hydroxybutyric acid) is precipitated in good yield from them on cooling. In addition they may be recycled without the need for a solvent regeneration step. These cyclic carbonic acid esters may also be used as the solvent in the processing of poly-(.beta.-hydroxybutyric acid) by e.g. wet spinning.

269680

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