A practical approach to fixed-site-carrier facilitated transport modeling for the separation of propylene/propane mixtures through silver- containing polymeric membranes

作者：Zarca Raul; Ortiz Alfredo; Gorri Daniel; Ortiz Inmaculada^*

来源：Separation and Purification Technology, 2017, 180: 82-89.

DOI：10.1016/j.seppur.2017.02.050

• Propylene
• Propane
• AgBF4
• PVDF-HFP
• Membrane
• Fixed-site carrier mathematical model

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.

• 出版日期2017-6-8