The flat panel reactor is composed of 112 units consisting of 20 flat panels, each 10-cm thick with a liquid height of 90 cm, which is equivalent to a V/S ratio of 50 L/m2 and working volume of 910 m3. The tubular reactor consists of tubes 9 cm in diameter, according to data reported by Acien et al. (2012), with a V/S ratio of 70 L/m2 and working volume of 750 m3.