期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 180, 期 -, 页码 82-89出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2017.02.050
关键词
Propylene; Propane; AgBF4; PVDF-HFP; Membrane; Fixed-site carrier mathematical model
资金
- Spanish Ministry of Science (MINECO, Spain-FEDER) [CTQ2015-66078-R, CTQ2016-75158-R]
- Universidad de Cantabria for a postgraduate fellowship
In this work, a new consistent mathematical model for the description of the olefin flux through Ag+- containing polymeric dense membranes is proposed. A fixed site carrier hopping parameter acting as an effective permeability for this specific transport phenomenon is defined and calculated for the first time. This study reports a simple and versatile approach that can be incorporated into future models to simulate the more complex mobile/fixed hybrid mechanism acting in composite membranes. Furthermore, in order to validate the model, the proof of concept has been carried out with PVDF-HFP/AgBF4 facilitated transport membranes. The experimental analysis has been performed by the continuous flow permeation method through flat membranes containing increasing silver loads, from 17 to 38% w/w at olefin partial pressures ranging from 0.5 to 1.5 bar and temperatures of 293 and 303 K. These membranes showed a promising performance, reaching values of propylene permeability up to 1800 Barrer and very high propylene/propane selectivities. The reported model constitutes a very useful tool for process optimisation and scale-up. (C) 2017 Elsevier B.V. All rights reserved.
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