Chemical Engineering & Technology, Vol.35, No.3, 455-463, 2012
Design of a Mixed Ionic/Electronic Conducting Oxygen Transport Membrane Pilot Module
In the last years, a lot of ceramic materials were developed that, at higher temperatures, have a high electrical conductivity and a high conductivity of oxygen ions. Such mixed ionic/electronic conductors can be used to produce high-purity oxygen. This work focuses on the realization of a pilot membrane module, with BSCF (Ba0.5Sr0.5Co0.8Fe0.2O3-d) perovskite selected as the membrane material. An amount of 500kg of powder was industrially fabricated, spray-granulized and pressed into tubes. The best operation conditions concerning energy consumption were calculated, and a module reactor was designed operating at 850 degrees C, with an air pressure of 1520bar on the feed site and a low vacuum of about 0.8bar on the permeate site. Special emphasis was placed on joining alternatives for ceramic tubes in metallic bottoms. A first laboratory module was tested with a membrane area of 1m2 and then advanced to a pilot module with 570tubes and a capability of more than 300 000L of pure oxygen per day.