Synthesis of Poly(Lactic Acid) from Ammonium Lactate Fermentation Broth of Food Waste

文献类型： 外文期刊

第一作者： Zhang, Bingxin

作者： Zhang, Bingxin;Guo, Yan;Gao, Ming;Wu, Chuanfu;Wang, Xiaona;Wang, Qunhui;Sun, Xiaohong

作者机构：

关键词： Food waste; Ammonium lactate fermentation broth; Stannous chloride modified resin; Butyl lactate; Lactide; Poly(lactic acid)

期刊名称：WASTE AND BIOMASS VALORIZATION （ 影响因子：3.2； 五年影响因子：3.4 ）

ISSN： 1877-2641

年卷期： 2024 年

页码：

收录情况： SCI

摘要： In this study, ammonium lactate from food waste fermentation broth was used as raw material to synthesize butyl lactate with butanol catalyzed by SnCl2-modified cation exchange resin (Sn-CER) followed by direct synthesis of lactide and final polymerization to obtain poly(lactic acid) (PLA). A new Lewis acidic center was formed in the Sn-CER by complexation reaction and the maximum loading of Sn was 31%. The Lewis acid center was converted to the Bronsted acid center by combining with water during the catalytic process, which facilitated the deammoniation and esterification reactions. The conversion yield of butyl lactate reached 87.7% at an esterification time of 6 h, an alcohol/ammonium lactate molar ratio of 3:1, an initial concentration of 30 wt% of ammonium lactate and a catalyst loading of 1.5 wt%. The synthesized butyl lactide was converted into lactide in the presence of stannous octanoate, and the yield reached 61.6% under optimal conditions (polymerization temperature of 160 degrees C, polymerization time of 7 h, and catalyst loading of 1.0 wt%). PLA with a molecular weight of 8.05 x 104 was synthesized by the polymerization reaction of lactide at 160 degrees C for 5 h. Therefore, it is feasible to synthesize PLA from food waste, which is an effective way to resource the waste.

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