Radon Mitigation by Distillation in nEXO

nEXO is an experiment aiming to observe neutrinoless double beta (0vBB) decay with 5 tonnes of enriched liquid xenon contained within a time projection chamber (TPC). If observed, 0vBB decay would imply the existence of Majorana neutrinos that are their own antiparticle. The nEXO detector collects ionization electrons and scintillation photons produced by particle interactions in xenon to reconstruct deposited energy, location, and topology. Half of the background in nEXO is expected to come from Radon-222 which emanates from parts in the system and uniformly mixes with the xenon. Radon-222 decay daughters can plate out onto surfaces in the detector and produce radioactivity with a similar energy signature to 0vBB decay. The Radon-222 background requirements for nEXO are stringent and all materials in contact with the xenon will be screened for radon emanation. In addition, a prototype cryogenic distillation column is being developed to define design parameters of such a radon-suppression device that could be added to the current nEXO design. We present the design and construction of this distillation column.