Process intensification in a photocatalytic membrane reactor: Analysis of the techniques to integrate reaction and separation

Abstract Different methods to integrate reaction and separation in a membrane reactor are studied in the present work, with the aim being to highlight the pros and cons of the different alternatives and the effects of the intervening parameters. The coupling of the two processes can take place inside a single apparatus or using separate units. If a single apparatus is utilized, the coupling is more direct, but separate units offer higher degrees of freedom for the design with more opportunities to optimize the system without constraints. However, when using separate units, the integration of the two unit operations depends largely on the parameters intervening in the coupling procedure. These parameters are the recycle ratio, R, if a recycle stream is used to backmix part of the exiting stream, or the number, N, of blocks if the volume of the reaction and the membrane area are fractionated into multiple reaction-separation blocks. The possibility of different combinations of these two basic methods is also presented. The case study to illustrate the effect of the various parameters (R, N, the Damkohler number and the Peclet number) and to find the proper operating conditions is the photocatalytic green synthesis of an aromatic aldehyde, which is recovered from the reaction solution by a pervaporation process to avoid further oxidation. The results show that process intensification is the result of appropriately choosing the reaction system and operating conditions because these factors may substantially increase the yield.

[1]  Suttichai Assabumrungrat,et al.  Theoretical study on the synthesis of methyl acetate from methanol and acetic acid in pervaporation membrane reactors: effect of continuous-flow modes , 2003 .

[2]  Enrico Drioli,et al.  Membrane Reactors: Advanced Systems for Intensified Chemical Processes , 2014 .

[3]  B. Bruggen.  Pervaporation Membrane Reactors , 2010 .

[4]  S. Tlatlik,et al.  Process synthesis for reactive separations , 2003 .

[5]  G. Palmisano,et al.  Synthesis of vanillin in water by TiO2 photocatalysis , 2012 .

[6]  G. Camera-Roda,et al.  Improvement of Membrane Performances to Enhance the Yield of Vanillin in a Pervaporation Reactor , 2014, Membranes.

[7]  M. David,et al.  Pervaporation-esterification coupling. II: Modelling of the influence of different operating parameters , 1991 .

[8]  G. Camera-Roda,et al.  Design of a Pervaporation Photocatalytic Reactor for Process Intensification , 2012 .

[9]  A. I. Stankiewicz,et al.  Process Intensification: Transforming Chemical Engineering , 2000 .

[10]  A. Stankiewicz.  Reactive separations for process intensification: an industrial perspective , 2003 .

[11]  G. Palmisano,et al.  A Pervaporation Photocatalytic Reactor for the Green Synthesis of Vanillin , 2013 .

[12]  T. Tsotsis,et al.  Catalytic Membranes and Membrane Reactors , 2018 .

[13]  J. Keurentjes,et al.  The esterification of tartaric acid with ethanol: Kinetics and shifting the equilibrium by means of pervaporation , 1994 .

[14]  Oğuzhan Alagöz,et al.  Selective photocatalytic oxidation of 4-substituted aromatic alcohols in water with rutile TiO2 prepared at room temperature , 2009 .

[15]  G. Palmisano,et al.  Photocatalytic process intensification by coupling with pervaporation , 2011 .

[16]  I. Agirre,et al.  The Conceptual Design of a Continuous Pervaporation Membrane Reactor for the Production of 1,1-Diethoxy Butane , 2012 .

[17]  G. Palmisano,et al.  Photocatalytic Selective Oxidation of 4‐Methoxybenzyl Alcohol to Aldehyde in Aqueous Suspension of Home‐Prepared Titanium Dioxide Catalyst , 2007 .

[18]  Henner Schmidt-Traub,et al.  Integrated reaction and separation operations : modelling and experimental validation , 2006 .

[19]  O. Levenspiel.  Chemical Reaction Engineering , 1972 .

[20]  F. Dautzenberg,et al.  Process intensification using multifunctional reactors , 2001 .

[21]  Seung-Bin Park,et al.  Design guide of a membrane for a membrane reactor in terms of permeability and selectivity , 2000 .

[22]  Effect of temperature on equilibrium shift in reactors with a permselective wall , 1988 .

[23]  M. Sahimi,et al.  Design issues of pervaporation membrane reactors for esterification , 2002 .

[24]  Rafiqul Gani,et al.  Process intensification: A perspective on process synthesis , 2010 .

[25]  Rohit R. Rewagad,et al.  MODELING AND SIMULATION OF A PERVAPORATION PROCESS FOR FATTY ESTER SYNTHESIS , 2012 .

[26]  J. Beltramini,et al.  An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using Molecular Sieve Silica (MSS) membrane reactors , 2006 .

[27]  Rafiqul Gani,et al.  A process synthesis-intensification framework for the development of sustainable membrane-based operations , 2014 .