Membrane double spiral-tube

Flat double spiral tube membrane reactor. 

Double Spiral-Plate or Spiral-Tube Membrane Reactors... 

In the second configuration (Figure 11.45), a membrane is fabricated into a bank of seamless thin-walled tubes to form flat double spiral partitions. One spiral is placed on top of the other such that each succeeding spiral is in a mirror symmetry with the adjacent one. This type of membrane reactor has been utilized for hydrogenation of liquid compounds [Gryaznov et al., 1981]. 

Finally, possible causes for deactivation of catalytic membranes are described and severad aspects of regenerating catalytic membrane reactors are discussed. A variety of membrane reactor configurations are mentioned and some unique membrane reactor designs such as double spiral-plate or spiral-tube reactor, fuel cell unit, crossflow dualcompartment reactor, hollow-fiber reactor and fluidized-bed membrane reactor are reviewed. 

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