Oxygen production of tubular module with La0.6Sr0.4Ti0.3Fe0.7O3−δ coated Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane

In this work, module containing La0.6Sr0.4Ti0.3Fe0.7O3−δ coated Ba0.5Sr0.5Co0.8Fe0.2O3−δ tubular membranes was successfully prepared and evaluated for oxygen production. The oxygen permeability of a single-La0.6Sr0.4Ti0.3Fe0.7O3−δ coated Ba0.5Sr0.5Co0.8Fe0.2O3−δ tubular membrane was studied in the same condition for comparison. The oxygen permeation flux was measured at temperature, air pressure, and retentate flow rate range of 850–950 °C, 3–9 atm, and 200–5000 mL/min, respectively. Oxygen permeation flux increased with increasing retentate flow rate, temperature and air pressure, while oxygen recovery decreased with increasing retentate flow rate at the same condition. Oxygen production rate and recovery of module containing three-La0.6Sr0.4Ti0.3Fe0.7O3−δ coated Ba0.5Sr0.5Co0.8Fe0.2O3−δ tubular membranes (length = 22.5 cm, total effective surface area = 75.06 cm2 (25.02 cm2 × 3), thickness = 0.8 mm) were 463 mL/min and 40% at 900 °C under 9 atm and 5000 mL/min retentate flow, respectively. Moreover, long-term operation test results indicate that the oxygen production rate was quite stable during the oxygen production operation.

► Tubular membrane module has good performance in oxygen production.
► Excellent correlation was found between oxygen permeability and operating condition.
► The oxygen production rate was quite stable during the oxygen production operation.