Theoretical and Experimental Investigation of Concentration and Contact Time Effects in Membrane Reactors

Packed‐Bed Membrane Reactors

“…Without the occurrence of chemical reactions in the PBR the molar fraction of oxygen is constant along the reactor length. Considering the ODH of short -chain alkanes, a high oxygen level is undesirable because it favours the consecutive reactions (Hamel et al , 2003 ;Klose et al , 2003b ;Tota et al , 2004 ). Via distributed feeding the local oxygen concentration can be reduced in a membrane reactor, as shown in Figure 5.2 b.…”

“…Comprehensive parametric studies can be carried out within a few minutes, which makes this model attractive for optimization calculations. A reduced reactor model was applied for an effi cient calculation and evaluation of PBR and PBMR in a broad range of operation conditions Hamel et al , 2006 ;Hamel et al , 2003 ;Tota et al , 2004 ). The simplifi ed " 1 -D model " allows analysis of a series connection of S equally sized stages of isothermal tubular reactors, as illustrated in Figure 5.1 .…”

“…This can be conveniently realized using tubular membranes. The concept of improving product selectivities in parallel -series reactions by feeding one reactant through a membrane tube into the reaction zone was studied, for example, by (Coronas, Menendez, and Santamaria, 1995 ;Diakov and Varma, 2004 ;Hamel et al , 2003 ;K ü rten, Sint Annaland, and Kuipers, 2004 ;Lafarga, Santamaria, and Men é ndez, 1994 ;Lu et al , 2000 ;Seidel -Morgenstern, 2005 ;Tota et al , 2004 ;Zeng, Lin, and Swartz, 1998 ).…”

Multiscale modeling of transport and residence times in nanostructured membranes

“…For example, membrane reactors can enhance the selectivity and yield in networks of series and parallel reactions. 3 This article focuses on new, ultrauniform, inorganic, nanostructured membranes, fabricated by a combination of anodic aluminum oxidation (AAO) and atomic layer deposition (ALD). 4 The combination of these two techniques provides a flexible synthesis route to control the membrane pore diameter and the structure and composition of the pore walls.…”

Alternative Reaction Engineering Concepts in Partial Oxidations on Oxidic Catalysts

“…In the former case, optimised dosing concepts had been investigated theoretically and experimentally in the oxidative dehydrogenation of ethane (76). The theoretical results, based on a simplified triangular reaction network, revealed the potential of an increase of selectivity.…”