Polylactic acid decomposition method
AssigneeOsaka Gas Co., Ltd.
InventorJun Tsubota
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Abstract
A primary object of the present invention is to provide a polylactic acid decomposition method that efficiently decomposes polylactic acid so that the polylactic acid can readily undergo degradation by a biological treatment such as methane fermentation. Specifically, the present invention provides a polylactic acid decomposition method involving a step of impregnating a polylactic acid-containing organic material with a treatment solution containing an organic acid salt and/or inorganic acid salt of an amine compound.
Claims13
A method for treating a polylactic acid, comprising impregnating a polylactic acid-containing organic material with a treatment solution containing an organic acid salt and/or inorganic acid salt of an amine compound represented by Formula (I)
- wherein R1, R2, and R3 are the same or different and
- represent hydrogen or C1-5 alkyl to perform a treatment.
A method for treating a polylactic acid-containing organic material comprising the steps of:
- (a) impregnating the polylactic acid-containing organic material with a treatment solution containing an organic acid salt and/or inorganic acid salt of an amine compound represented by Formula (I)
- wherein R1, R2, and R3 are the same or different and represent hydrogen or C1-5 alkyl to decompose the polylactic acid;
- and
- (b) subjecting the decomposition product obtained in step (a) to methane fermentation.
A system for subjecting a polylactic acid obtained by decomposing a polylactic acid-containing organic material to methane fermentation, the system comprising a polylactic acid decomposition tank for heating the polylactic acid-containing organic material and an organic acid salt and/or inorganic acid salt of an amine compound represented by Formula (I)
- wherein R1, R2, and R3 are the same or different and represent hydrogen or C1-5 alkyl
- to a temperature of greater than 40° C. to decompose the polylactic acid;
- and
- a methane fermentation tank for subjecting the decomposed polylactic acid to methane fermentation,
- wherein the decomposition tank comprises an ammonia stripping means and a means for returning the stripped ammonia to the decomposition tank to achieve a predetermined concentration.
Use of an organic acid salt and/or inorganic acid salt of an amine compound represented by Formula (I)
- to decompose a polylactic acid.
Dependencies are inferred from the claim text.