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首页> 外文期刊>Clean technologies and environmental policy >Preparation and characterization of green polylactic acid (PLA) membranes for organic/organic separation by pervaporation
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Preparation and characterization of green polylactic acid (PLA) membranes for organic/organic separation by pervaporation

机译：渗透蒸发法分离有机/有机绿色聚乳酸（PLA）膜的制备和表征

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摘要

Membrane science, in the context of the growing attention towards the preservation and protection of the environment, has an emerging role as a very well-recognised eco-friendly technology. In order to meet the complete concept of sustainability, however, greener strategies still need to be put in place regarding the preparation of the membranes. Polylactic acid (PLA) green flat sheet membranes were prepared using ethyl lactate as a green solvent and water as a non-solvent, for the first time. The morphology, thickness, contact angle, mechanical properties, FTIR and degree of swelling were determined for studying the properties of the produced membranes. A systematic study was performed testing PLA membranes in pervaporation (PV) for the separation of methanol (MeOH)/methyl tert-butyl ether (MTBE) azeotropic mixture evaluating their performance by varying feed temperature and vacuum degree. The findings revealed that the membrane morphology changed from finger-like to spongy-like and finally to dense-like structure by acting on the evaporation time (ET) during the preparation with an improvement in the overall mechanical properties. The PLA dense membrane produced with an ET of 7min was successfully tested in PV exhibiting a preferred permeation towards MeOH with a highest selectivity value of more than 75. An Arrhenius-type dependence between flux and temperature was found.[GRAPHICS].
机译：膜科学在人们日益关注保护和保护环境的背景下，已成为一种公认的环保技术，其作用日益显着。但是，为了满足可持续性的完整概念，在膜的制备方面仍需要采取更环保的策略。首次使用乳酸乙酯作为绿色溶剂和水作为非溶剂制备聚乳酸（PLA）绿色平板膜。确定形态，厚度，接触角，机械性能，FTIR和溶胀度，以研究所生产的膜的性能。进行了系统的研究，在全蒸发（PV）中测试PLA膜以分离甲醇（MeOH）/甲基叔丁基醚（MTBE）共沸混合物，通过改变进料温度和真空度评估其性能。这些发现表明，通过在制备过程中作用于蒸发时间（ET），膜的形态从手指状变为海绵状，最后变为致密状，从而改善了总体机械性能。在PV上成功测试了ET为7min的PLA致密膜，该膜表现出对MeOH的优选渗透性，其最高选择性值超过75。发现了通量和温度之间的Arrhenius型依赖性。

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