Enhanced oil removal and eco-efficiency in recycled polyester yarn via flow-optimized waterless processing

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-09-30 DOI:10.1016/j.colsurfa.2025.138496

Jie Chen , Qin Fang , Laijiu Zheng , Huanda Zheng

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引用次数: 0

Abstract

Supercritical CO₂ technology provides an effective means of mitigating environmental pollution caused by conventional water-based oil removal from synthetic fibers. However, the structural design of the bobbin hinders its efficiency. Herein, a bobbin was redesigned via computational fluid dynamics (CFD) simulation to enhance the oil removal efficiency of recycled polyester yarn. The redesigned bobbin (inner diameter 55 mm, pore diameters 5–8 mm) exhibited a more uniform fluid velocity and a reduction in total pressure loss by 715.07 Pa compared to the original design. Experimental validation confirmed that the oil removal rate was significantly increased from 58.54 % to 78.05 % in the inner layer, from 72.39 % to 75.46 % in the middle layer, and from 54.76 % to 69.64 % in the outer layer. The dyed samples after oil removal showed improved color depth (K/S value increased from 5.12 to 5.87) and uniformity. This design strategy achieves an energy savings of 22 kWh per ton of yarn while maintaining zero wastewater discharge, providing a theoretical foundation for the design of supercritical equipment.

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通过流动优化的无水处理，提高了再生聚酯纱的除油和生态效率

超临界CO2技术为减轻合成纤维常规水基除油对环境的污染提供了有效手段。然而，筒子的结构设计阻碍了其效率的提高。通过计算流体动力学（CFD）模拟，对纺纱筒进行了重新设计，提高了再生涤纶纱的除油效率。与原始设计相比，重新设计的筒管（内径55 mm，孔径5-8 mm）具有更均匀的流体速度，总压损失降低了715.07 Pa。实验验证，内层的除油率由58.54 %提高到78.05 %，中间层由72.39 %提高到75.46 %，外层由54.76 %提高到69.64 %。脱油后的染色样品的颜色深度（K/S值由5.12提高到5.87）和均匀性得到改善。该设计策略在保持废水零排放的同时，实现了每吨纱节能22千瓦时，为超临界设备的设计提供了理论依据。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.