Selective separation of HFC-32 from R-410A using poly(dimethylsiloxane) and a copolymer of perfluoro(butenyl vinyl ether) and perfluoro(2,2-dimethyl-1,3-dioxole)
Selective separation of HFC-32 from R-410A using poly(dimethylsiloxane) and a copolymer of perfluoro(butenyl vinyl ether) and perfluoro(2,2-dimethyl-1,3-dioxole)
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DOI：
10.1016/j.memsci.2022.120467
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发表时间：
2022-03
影响因子：
9.5
通讯作者：
Abby N. Harders;Erin R. Sturd;Julia E. Vallier;D. Corbin;Whitney R. White;C. Junk;M. Shiflett
中科院分区：
文献类型：
--
作者：
Abby N. Harders;Erin R. Sturd;Julia E. Vallier;D. Corbin;Whitney R. White;C. Junk;M. Shiflett
目前，有数百万公斤的氢氟碳化合物和氢氟碳化合物混合物在使用，但没有有效分离各成分的方法。与蒸馏等替代分离方法相比，膜是一种有吸引力的分离 HFC 制冷剂混合物的方法，因为它的能耗和资本要求较低。本研究研究了使用聚（二甲基硅氧烷）和 CyclAFlor™（5 mol% 全氟（丁烯基乙烯基醚）和 95 mol% 全氟（2,2-二甲基-1,3-间二氧杂环戊烯）的无定形共聚物）分离 R-410A，R-410A 是由 50 wt% 二氟甲烷（HFC-32、CH2F2）和 50 wt% 五氟乙烷组成的共沸混合物（HFC-125、CHF2CF3）。采用静态膜装置和升压法测量HFC-32和HFC-125的纯气体渗透率。使用重量微天平测量溶解度和扩散率。渗透率测量表明，使用 CyclAFlor™ 时，HFC-32 的选择性高于 HFC-125，并且利用混合气体装置进行的混合气体选择性测量与基于溶解度和扩散率测量的理想选择性计算结果非常一致。稳定性研究表明，在 HFC-32 和 HFC-125 存在的情况下，氟化无定形聚合物膜的塑化程度极小。
Currently, millions of kilograms of HFCs and HFC mixtures are in use with no method for efficiently separating the components. Membranes are an attractive method for separating HFC refrigerant mixtures due to both lower energy consumption and capital requirements compared with alternative separation methods such as distillation. This study investigates the use of poly(dimethylsiloxane) and CyclAFlor™, an amorphous copolymer of 5 mol% perfluoro(butenyl vinyl ether) and 95 mol% perfluoro(2,2-dimethyl-1,3-dioxole), for the separation of R-410A, an azeotropic mixture composed of 50 wt% difluoromethane (HFC-32, CH2F2) and 50 wt% pentafluoroethane (HFC-125, CHF2CF3). Pure gas permeability of HFC-32 and HFC-125 were measured using a static membrane apparatus and the pressure-rise method. Solubility and diffusivity were measured using a gravimetric microbalance. Permeability measurements indicate high selectivity of HFC-32 over HFC-125 with CyclAFlor™, and mixed gas selectivity measurements utilizing a mixed gas apparatus are in excellent agreement with ideal selectivity calculations based on solubility and diffusivity measurements. Stability studies indicate that plasticization of the fluorinated amorphous polymer membrane is minimal in the presence of HFC-32 and HFC-125.