Theoretical analysis of reactant dosing concepts to perform parallel-series reactions

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.…”

“…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 ).…”

“…In this contribution the partial oxidations of ethane to ethylene and propane to propylene as model reactions performed in a pilot -scale membrane reactor were investigated in detail. For such reactions improved integral reactor performance can be achieved further by an optimized stage -wise dosing of one or several reactants (Hamel et al , 2003 ;Thomas, 2003 ). Adjusted dosing profi les can be realised, for example, by feeding reactants separately through permeable reactor walls (e.g., through tubular membranes discussed in Chapter 4 ).…”

Ausbeutesteigerung mittels Membranreaktoren bei Parallel- und Folgereaktionen

“…Die Reaktionssysteme sind: Parallelreaktion mit einem und zwei Edukten, Folgereaktion mit zwei Edukten sowie Parallel-und Folgereaktion mit zwei Edukten unter Einbeziehung von analytischen Lösungen [15,16] sowie numerischer Optimierung unter Verwendung des SQP-Algorithmus [12,17].…”

Real‐time optimization of a tubular reactor with distributed feed

“…[4][5][6][7][8] The results of these works are based on the perfect knowledge of the structure and the parameters of the reaction kinetics. This is especially true in the application of optimal controller design, where a perfect knowledge of the process model is required to perform a reliable off-line optimization.…”