用厨房垃圾的乳酸发酵液合成丙交酯的研究Study on Synthesis of Lactide Originated from Kitchen Garbage
孙晓红,汪群慧,马睿,程桂石,赵莹
摘要(Abstract)：
以营养丰富的厨房垃圾为原料,通过接种乳酸菌发酵,得到了乳酸含量为31.47g?L?1的厨房垃圾发酵液;用电渗析法从厨房垃圾发酵液中提取乳酸,将电渗析分离液经减压脱水浓缩至乳酸含量为70%~80%(wt),作为合成丙交酯的原料。选用氧化锌作为解聚剂,分析纯D,L-乳酸作为原料通过正交设计实验确定了生成丙交酯的最佳条件为:预聚温度150℃,预聚时间3h,解聚剂用量为1.0%(wt),解聚温度220℃;在此条件下,以厨房垃圾发酵液提取的乳酸为原料合成丙交酯,其产率为60%。该丙交酯经熔点测定、红外光谱和核磁共振分析的结果表明:用厨房垃圾的乳酸发酵液合成的丙交酯为D,L-丙交酯。本工艺不但可降低丙交酯的生产成本,而且解决了厨房垃圾的环境污染问题。
关键词(KeyWords)： 厨房垃圾;乳酸发酵;丙交酯;电渗析
基金项目(Foundation): 国家自然科学基金委员会与中国节能投资公司联合研究基金资助(50278024);; 黑龙江省留学回国基金资助项目(LC02C03)。
作者(Author): 孙晓红,汪群慧,马睿,程桂石,赵莹
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