| abstract |
(57) [Summary] (Modified) [Purpose] A method for recovering a compound having a hydroxy acid value from a poly (hydroxy acid) -containing raw material. (A) contacting the raw material with a solubilizing liquid in an amount of at least 1 mol per mol of the hydroxy acid equivalent present in the poly (hydroxy acid) -containing raw material, However, the solubilizing liquid is (1) water, (2) C1-6 alcohol, (3) water and a mixture of the above alcohols, (4) amine of formula HNR 1 R 2 (R 1 and R 2 are H, C 1-4 alkyl groups), (5) formula H (R 3 ) NR 5 N (R 4 ) H (R 3 and R 4 are H, C 1 to 4 alkyl groups, or A liquid medium containing together a diamine having a heterocycle, wherein R 5 is C 2-12 alkylene or phenylene), and (6) the amine and / or diamine and water and / or C 1- A mixture of 6 alcohols, selected from the group consisting of: (b) Maintaining the resulting mixture under sufficient temperature and pressure for a sufficient period of time, (c) recovering the liquid phase. |