Separation of Azeotropic Refrigerant Mixtures: R-450A, R-456A, R-515B, and R-516A Using Phosphonium- and Imidazolium-Based Ionic Liquids,Industrial & Engineering Chemistry Research

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Separation of Azeotropic Refrigerant Mixtures: R-450A, R-456A, R-515B, and R-516A Using Phosphonium- and Imidazolium-Based Ionic Liquids
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-04-02 , DOI: 10.1021/acs.iecr.4c00531
Abdulrhman M. Arishi _{1,

2,

3} , Julia E. Espinoza Mejia _{1,

2} , Mark B. Shiflett _{1,

2}

Affiliation

Hydrofluorocarbon (HFC) refrigerants are currently being phased down by 85% over the next two decades due to their high global warming potential (GWP). Hydrofluoroolefin (HFO) refrigerants are being commercialized as replacements for HFCs and have significantly lower GWP and zero ozone depletion potential (ODP). A challenge in the transition to HFO refrigerants is compatibility with the existing equipment. One solution is blending HFO and HFC refrigerants to match equipment performance. Several azeotropic refrigerant mixtures, such as R-450A, R-456A, R-515B, and R-516A, have lower GWP and provide similar thermophysical properties to replace HFCs in existing systems. HFO/HFC blends are excellent alternatives that enable the reduction of HFCs while still maintaining the lifespan of existing equipment. Many HFO/HFC refrigerant mixtures are designed to be azeotropic or near-azeotropic so that if the refrigerant leaks from the system, only a minimal change in composition will occur, which makes servicing the equipment easier. However, this poses a challenge when recycling the refrigerant because conventional distillation cannot be used to separate the HFO/HFC components back into pure products. A proposed solution for separating azeotropic mixtures uses extractive distillation with an ionic liquid (IL) as the entrainer. This novel method offers an efficient means of separating azeotropic refrigerant mixtures. The efficacy of ILs as entrainers is contingent upon their selectivity and strong affinity toward one or more components of the mixture. In addition, the limited availability of solubility data for HFOs and HFCs in ILs constrains the process of selection. This work has identified phosphonium- and imidazolium-based ILs for the separation of four commercial HFO/HFC refrigerant mixtures based on ASPEN Plus simulations.

中文翻译：

使用鏻基和咪唑基离子液体分离共沸制冷剂混合物：R-450A、R-456A、R-515B 和 R-516A

由于氢氟碳化物 (HFC) 制冷剂全球变暖潜值 (GWP) 较高，目前将在未来二十年逐步淘汰 85%。氢氟烯烃 (HFO) 制冷剂正在作为 HFC 的替代品进行商业化，其 GWP 显着降低且臭氧消耗潜值 (ODP) 为零。过渡到 HFO 制冷剂的一个挑战是与现有设备的兼容性。一种解决方案是混合 HFO 和 HFC 制冷剂以匹配设备性能。几种共沸制冷剂混合物，例如 R-450A、R-456A、R-515B 和 R-516A，具有较低的 GWP，并提供类似的热物理特性来替代现有系统中的 HFC。 HFO/HFC 混合物是极好的替代品，可以减少 HFC，同时仍保持现有设备的使用寿命。许多 HFO/HFC 制冷剂混合物被设计为共沸或近共沸，因此，如果制冷剂从系统中泄漏，成分只会发生最小的变化，这使得设备维修变得更加容易。然而，这在回收制冷剂时提出了挑战，因为传统蒸馏无法将 HFO/HFC 成分分离回纯产品。提出的分离共沸混合物的解决方案使用萃取蒸馏，并以离子液体 (IL) 作为共沸剂。这种新颖的方法提供了一种分离共沸制冷剂混合物的有效方法。 IL 作为夹带剂的功效取决于它们对混合物中一种或多种组分的选择性和强亲和力。此外，IL 中 HFO 和 HFC 的溶解度数据有限，限制了选择过程。这项工作根据 ASPEN Plus 模拟，确定了基于鏻和咪唑鎓的离子液体，用于分离四种商用 HFO/HFC 制冷剂混合物。

更新日期：2024-04-02

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