Study on synthesis of polylactide from kitchen garbage |
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Authors: | Email author" target="_blank">Qunhui?WangEmail author Xiaohong?Sun Rui?Ma Wenchao?Zhao |
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Institution: | (1) Department of Environmental Science and Engineering, Harbin Institute of Technology, 150090 Harbin, China;(2) Department of Environmental Engineering, University of Science and Technology Beijing, 100083 Beijing, China |
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Abstract: | Polylactide is regarded as the most promising biodegradable plastics because of its high quality in physical properties as
well as chemical recyclability and compostability. Furthermore, lactic acid (LA) as a raw material of this polymer can be
produced from organic wastes. In this study, recovery LA from fermentation broth of kitchen garbage was carried out by esterification
of ammonium lactate in fermentation broth with the butanol to produce butyl lactate, purification of butyl lactate and subsequent
hydrolysis of the purified butyl lactate. The purity of recovered LA was 90%. Then the recovered LA was used to produce lactide
as an intermediate of polylactide. Through an orthogonal-design experiment, the optimum condition of synthesizing lactide
was determined and under this condition the yield of synthesizing lactide was 75%. And moreover, polylactide was conventionally
obtained by a ring-opening polymerazation from the above lactide, and the viscosity average molecular weight was up to 9.2
× 104, which could meet requirement to produce biodegradable plastics. In the present process, the neutral ammonium lactate in
the fermentation broth was employed as a starting material, thereby eliminating the need to use a reactor with acid resistance
properties. In addition, the liberated butanol in hydrolysis process and unreacted butanol in esterification process can be
recycled to the above esterification. Therefore, the present process is economic. |
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Keywords: | kitchen garbage lactic acid fermentation butyl lactate lactide polylactide |
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