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首页> 外文期刊>Journal of Polymers and the Environment >Integrated Polymer Dissolution and Solution Blow Spinning Coupled with Solvent Recovery for Expanded Polystyrene Recycling
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Integrated Polymer Dissolution and Solution Blow Spinning Coupled with Solvent Recovery for Expanded Polystyrene Recycling

机译：集成的聚合物溶解和溶液吹纺与溶剂回收相结合，用于扩大的聚苯乙烯回收利用

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With increasing buoyant plastic wastes entering into oceans and food chains, the disposal and recycling of waste expanded polystyrene (WPS) has become an imminent environmental problem. In this work, a recycling scheme for waste WPS is proposed that combines the polymer dissolution recycling approach with the solution blow spinning (SBS) technique that facilitates the high-volume bulk WPS transportation and the value-addition of WPS to nanofibers. Solvent selection is critical for an economical and environmentally favorable implementation of this recycling scheme at large scale. Here, the effect of three solvents with distinct volatility, viz. ethyl acetate, toluene, and N, N- dimethylformamide (DMF) have been studied on the fiber formation and the ease of the solvent recovery, in order to ascertain the practicability of using these solvents for the recycling process. The fiber formation is experimentally demonstrated for the WPS-solvent systems using the SBS process. It is found that the fiber morphology varies for the different WPS-solvent systems. A solvent recovery scheme to recover the solvent from the air-solvent mixture (leaving SBS) is evaluated using ASPEN Plus simulation. The % solvent recovery is determined as a function of the required energy input for different process parameters including compressor pressure and air to polymer solution feed ratio. The simulation studies show that a lower feed air to polymer solution ratio and higher compressor pressure are required to obtain70% solvent recovery for high volatility solvents (ethyl acetate and toluene) with lower energy input and optimal operating condenser temperature (0 degrees C). Conversely, significant solvent losses occur in the SBS process with a lower volatility solvent (DMF), leading to a lower solvent recovery for the whole process. The % DMF recovery can be improved upon by using higher feed air to polymer solution ratio although at a higher energy penalty.
机译：随着越来越多的可浮性塑料废物进入海洋和食物链，废物膨胀聚苯乙烯（WPS）的处置和回收已成为迫在眉睫的环境问题。在这项工作中，提出了一种废纸WPS的回收方案，该方案将聚合物溶解回收方法与溶液吹纺（SBS）技术相结合，该技术有助于大批量WPS的运输以及WPS在纳米纤维上的增值。溶剂的选择对于大规模实施该回收计划在经济和环境方面至关重要。在这里，三种溶剂具有明显的挥发性，即。为了确定将这些溶剂用于回收过程的实用性，已经研究了乙酸乙酯，甲苯和N，N-二甲基甲酰胺（DMF）的纤维形成和溶剂回收的难易程度。使用SBS工艺在WPS溶剂系统中实验证明了纤维的形成。发现不同的WPS-溶剂系统的纤维形态是不同的。使用ASPEN Plus模拟评估了从空气-溶剂混合物中回收溶剂（保留SBS）的溶剂回收方案。根据不同工艺参数（包括压缩机压力和空气与聚合物溶液的进料比）所需的能量输入来确定溶剂回收率％。仿真研究表明，对于能量输入较低且冷凝器工作温度最佳（0摄氏度）的高挥发性溶剂（乙酸乙酯和甲苯），要获得> 70％的溶剂回收率，需要较低的进料空气与聚合物的溶液比率和较高的压缩机压力。 。相反，使用较低挥发性溶剂（DMF）在SBS工艺中会发生大量溶剂损失，从而导致整个过程的溶剂回收率较低。通过使用较高的进料空气与聚合物溶液的比例可以提高DMF的回收率，尽管能耗较高。

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