Liquid aliphatic and aromatic hydrocarbons play an important role in refinery processes, the petrochemical, chemical and polymer industry, either as raw materials, process intermediates, or as end products. Regardless of their source or their further use, they all have in common that they need to be ultrapure. This means that they have to be free of undesired compounds, as these could affect the production process and the quality of the final products. Impurities such as sulfur-containing compounds not only affect the performance and economic life of the used catalysts (catalyst poisoning), but also form unwanted by-products and thereby decrease the quality of the end product. Therefore their content has to be kept as low as possible, preferably below 100 ppb.