We show here the use of a rotor-stator spinning disk reactor (RS-SDR) for photochemical production on industrial scale. The RS-SDR generates intense turbulence by the rotation of a disk between two closely spaced stators, which results in high rates of mass and heat transfer . For gas-liquid systems, Meeuwse et al. found values as high as 23 m L 3 •m G -3 •s -1 for the RS-SDR, 40 times higher than in conventional reactors . More recently, Kleiner and Hinrichsen also observed improved productivities for the multiphase epoxidation of methyl oleate in a RS-SDR . In addition to high mass transfer rates, a high illuminated interfacial area and light penetration per volume reactor can be achieved .