Making Plastics from Garbage
Making Plastics from Garbage
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DOI：
10.1162/108819803323059406
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发表时间：
2003-07
影响因子：
5.9
通讯作者：
K. Sakai;M. Taniguchi;Shigenobu Miura;H. Ohara;Toru Matsumoto;Y. Shirai
中科院分区：
文献类型：
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作者：
K. Sakai;M. Taniguchi;Shigenobu Miura;H. Ohara;Toru Matsumoto;Y. Shirai
我们提出了一种新型的城市食品垃圾回收系统，该系统结合了发酵和化学工艺，以生产高质量的聚L乳酸（PLLA）生物降解塑料。该工艺包括通过丙酸杆菌从切碎的食物垃圾中去除内源性D，L-乳酸，在半固体条件下进行L-乳酸发酵，通过丁基酯化纯化L-乳酸，以及通过LL-丙交酯聚合L-乳酸。该方法的总体设计使得具有高光学活性的PLLA（即，高比例的光学异构体）以及对每个步骤产生的所有材料进行新颖的回收，从而节省能源并减少排放。约50%的总碳被去除，主要是L-乳酸，100 kg收集的食物垃圾产生7.0 kg PLLA（约占总碳的34%）。以这种方式产生的PLLA的物理性质与由市售可得的产生的PLLA的物理性质相当。L乳酸从物质和能量平衡以及环境影响的角度对该工艺进行了评价。
We propose a novel recycling system for municipal food waste that combines fermentation and chemical processes to produce high‐quality poly‐L‐lactate (PLLA) biodegradable plastics. The process consists of removal of endogenous D, L‐lactic acid from minced food waste by a propionibacterium, L‐lactic acid fermentation under semisolid conditions, L‐lactic acid purification via butyl esterification, and L‐lactic acid polymerization via LL‐lactide. The total design of the process enables a high yield of PLLA with high optical activity (i.e., a high proportion of optical isomers) and novel recycling of all materials produced at each step, with energy savings and minimal emissions. Approximately 50% of the total carbon was removed, mostly as L‐lactic acid, and 100 kg of collected food waste yielded 7.0 kg PLLA (about 34% of the total carbon). The physical properties of the PLLA yielded in this manner were comparable to those of PLLA generated from commercially available. L‐lactic acid. Evaluation of the process is also discussed from the viewpoints of material and energy balances and environmental impact.