Disclosed is a process for preparing oxamyl (Methyl 2-(dimethylamino)-N-[(methylcarbamoyl)oxy]-2-oxoethanimidothioate, also known as Vydate (RTM)), the process comprising: a) providing a solution of oxamyl in a solvent system comprising a lower alcohol (i.e. C1-C6 alcohol) or a mixture of a lower alcohol and water, and b) precipitating oxamyl from the solution. Preferably, the oxamyl material employed in step a) comprises at least 80 wt.% oxamyl. Most preferably, the alcohol is monohydric and, more preferably, is one of methanol, ethanol, propanol (propan-1-ol) and isopropanol (IPA, propan-2-ol). Preferably, the solvent system is heated in step a), most preferably, heated to the boiling point of the solvent system. Preferably, the solution provided in step a) is filtered to remove undissolved material； more preferably, this is a hot filtration. Preferably, the solution of oxamyl in the solvent system is cooled in step b).
