This thesis project aims to develop an innovative technique for the production of high-purity uranium nitride (UN) through the ammonolysis of fluorides. The desired objective is to perform a controlled gas/gas reaction between uranium hexafluoride (UF6) and ammonia (NH3) at 800°C. The intermediate product thereby obtained (uranium dinitride, UN2) is subjected to further heating up to 1100°C under argon atmosphere, to ultimately produce UN. An inherent challenge faced in previous experiments was related to the dissociation of ammonia, which is a limiting factor for upscaling. Therefore, in this project a new setup is invented to address this challenge and it is proved experimentally: the idea is to achieve a coaxial laminar flow of UF6 and a carrier gas, where a central stream of the former is shielded by the latter so that the two reacting gasses mix only in the hot point of the furnace, where the desired reaction can happen.