Journal of Membrane Science & Technology

Polymeric catalytic membrane reactors for efficient reactions applied to fine chemistry

2^nd International Conference on Membrane Science and Technology

September 13-14, 2018 | London, UK

JC Remigy

Paul Sabatier University, France

Scientific Tracks Abstracts: J Membr Sci Technol

Abstract:

Catalytic membranes are interesting to combine the catalyst immobilization and the intensification of the contact between reactants and catalyst. Most catalytic membranes are based on inorganic materials due to their high resistance but recent results show that catalytic polymeric membranes are very efficient at low temperature when metal nanoparticle are used. This will allow to take advantage high compacity of hollow fibre module and their lowest cost. Nanoparticles (??<100 nm) are particularly interesting in catalysis field due to the massive increase of surface area that is observed upon reduction of scale. However, their use as suspended solids presents some drawbacks like the necessary separation step to recover and recycle them. Stabilization of suspended nanoparticles is also an important problem as the aggregations, which results in a decrease of the catalytic activity, must be avoided. Since 2006, our research group produces polymeric catalytic membranes using Pd nanoparticles (PdNP)(Emin et al., 2015, 2014; Gu et al., 2016a, 2016b, 2015). The PdNP are in situ regenerated in a polymer layer grafted at the surface of polymeric membranes. The grafted layer is a polymer gel where the PdNP are homogeneously dispersed in a non-aggregative way. The PdNP's diameters are around 2 nm and their local concentration is high (~1014 NP/mm3). The NP are entrapped in the grafted layer and no Pd is found in the permeat (ie. [Pd] below 3 ppb, ICP limit). The separation between the reactants/products and the catalyst is effective with no catalytic activity lost. As example, Suzuki???Miyaura cross-coupling was performed in a continuous way by filtering a reactant solution (1-iodo-4-nitrobenzene, phenylboronic acid) in 95% ethanol at 60°C. Complete conversion and selectivity were obtained for residence time of about 10s (~hour in batch reactor, intensification factor of x1000). The scale-up to industrial hollow fibre modules at constant flux density lead to production capacity up to 10000 ton/(year.m3), similar to the one of microreactors. Recent Publications 1. Emin, C., Gu, Y., Remigy, J.-C., Lahitte, J.-F., 2015. Polyethersulfone hollow fiber modified with poly(styrenesulfonate) and Pd nanoparticles for catalytic reaction. Eur. Phys. J.-Spec. Top. 224, 1843???1848. https://doi.org/10.1140/epjst/e2015- 02503-y 2. Emin, C., Remigy, J.-C., Lahitte, J.-F., 2014. Influence of UV grafting conditions and gel formation on the loading and stabilization of palladium nanoparticles in photografted polyethersulfone membrane for catalytic reactions. J. Membr. Sci. 455, 55???63. https://doi.org/10.1016/j.memsci.2013.12.049 3. Gu, Y., Emin, C., Remigy, J.-C., Favier, I., Gomez, M., Noble, R.D., Gin, D.L., Macanas, J., Domenech, B., Lahitte, J.-F., 2016a. Hybrid catalytic membranes: tunable and versatile materials for fine chemistry applications. Mater. Today-Proc. 3, 419???423. https://doi.org/10.1016/j.matpr.2016.01.031 4. Gu, Y., Favier, I., Pradel, C., Gin, D.L., Lahitte, J.-F., Noble, R.D., Gomez, M., Remigy, J.-C., 2015. High catalytic efficiency of palladium nanoparticles immobilized in a polymer membrane containing poly(ionic liquid) in Suzuki-Miyaura crosscoupling reaction. J. Membr. Sci. 492, 331???339. https://doi.org/10.1016/j.memsci.2015.05.051 5. Gu, Y., Remigy, J.-C., Favier, I., Gómez, M., Noble, R.D., Lahitte, J.-F., 2016b. Membrane reactor based on hybrid nanomaterials for process intensification of catalytic hydrogenation reaction: an example of reduction of the environmental footprint of chemical synthesis from a batch to a continuous flow chemistry process. Chem. Eng. Trans. 47, 367???372.

Biography :

JC Remigy lead the hollow fibre team at LGC. He works on polymeric membranes elaborations using the phase inversion technique or surface modifications applied to flat sheet or hollow fibre membranes. He studied membranes processes such as nano or ultrafiltration, membrane contactors or catalytic membrane reactors as applications of the elaborated membranes or as treatment processes of pollution or separation (CO2 Capture, dye removal, …). He conducts projects related to the industrialization of the developed technologies (UV surface modification or dense membranes contactors) and works on industrial problems (non-fouling PvDF UF hollow fibre membrane or membrane aerated biofilm). Today, he devotes his research to the design of membranes adapted to new processes keeping in mind the processes final specificities. He has a strong experience in collaborative projects (fundamental or/and applied research) working with public researchers or industrials. He is also head of the master for physico-chemical processes applied to chemistry, environment and energy at the Paul Sabatier University.

E-mail: remigy@chimie.ups-tlse.fr