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SUMMARY:Membrane separations and energy efficiency: a critical overview
DTSTART:20171005T103000
DTEND:20171005T113000
DTSTAMP:20260511T204801Z
UID:42d04a004171a11ae90ee7896b9b101a5d7293210e6b45f29d90d816
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Eric Favre\, LRGP-CNRS Université de Lorraine\nNancy\, 
 France\nChE-605 - Highlights in Energy Research seminar series\n\nMembrane
  processes are usually considered to offer very promising potentialities i
 n terms of energy efficiency for industrial separations [1-2]. This statem
 ent particularly holds for homogeneous gas and liquid separations which ar
 e traditionally performed thanks to unit operations based on a phase chang
 e (distillation\, evaporation\, condensation\, crystallization…). The en
 ergy efficiency concept can however be addressed through different methodo
 logies\, potentially leading to different\, if not opposite conclusions [3
 ]. A critical analysis of the energy efficiency concept for membrane separ
 ations is proposed. Starting from the most usual minimal work of separatio
 n definition [4]\, alternative expressions of this key concept are develop
 ed in order to better reflect the different types of separation situations
  encountered for practical purposes (solute purification and/or recovery\,
  process selectivity). In a second step\, the real work of separation of a
  given process\, classically evaluated through modern Process Systems Engi
 neering computations\, including thermodynamic modelling and irreversibili
 ties\, is discussed. The interest of the entropy dissipation function\, ob
 tained from Irreversible Processes Thermodynamics (IPT\, [5]) approach is 
 then presented. The methodology is applied to different case studies. The 
 local entropy dissipation rate offers the opportunity to analyze the impac
 t of fluid distribution in membrane modules\, possibly leading to improved
  designs through the entropy equipartition theory. The largely unexplored 
 possibilities of IPT to provide a predictive evaluation of the overall ene
 rgy efficiency of a separation process\, based on a diffusional mass trans
 fer mechanism [6]\, is finally illustrated.\n \n[1] Oak Ridge National la
 boratory\, Materials for Separation Technologies: Energy Emission Reductio
 n Opportunities (2005)\n[2] D.S.Sholl\, R.P. Lively Seven chemical separat
 ions to change the world. Nature (2016) 532\, 435-437.\n[3] Haselden\, G.G
 .\, Gas separation fundamentals. Gas Separation & Purification\, 3 (1989) 
 209.\n[4] Humphrey\, J.L.\, Keller\, G.E. (1997) Separation Process Techno
 logy\, Mac Graw Hill Ed.\, New York.\n[5] Hwang\, S.T.\, Non equilibrium t
 hermodynamics of membrane transport\, AIChE Journal\, 50\, 4 (2004) 862.\n
 [6] Breton J.P. (1974) Annals of Nuclear Science & Engineering\, 1\, 293.
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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