Method of preparing low-sulphur aliphatic compounds

A process for producing low-sulfur aliphatic products, from olefin-rich starting materials contaminated with organic sulfur compounds, which starting materials are selected from the class consisting of olefins and olefin mixtures, which process comprises:

• a) subjecting the sulfurous olefin-rich starting materials to a single- or multi-stage liquid-liquid extraction with a morpholinic extractant and
• b) removing the extractant and the sulfur compounds comprised therein to obtain a low-sulfur aliphatic product having an essentially unchanged olefin content, which product is suitable for industrial use in hydroformylation processes.