Process and plant for producing synthetic fuels

A process for producing synthetic fuels from an educt mixture containing steam and oxygenates comprising:

• a first process stage, in which the educt mixture is reacted on a catalyst to obtain a hydrocarbon product containing olefins with 2 to 8 carbon atoms,
• a second process stage, in which the hydrocarbon product obtained is oligomerized to higher olefins with 10 to 20 carbon atoms, and
• a third process stage, in which a product stream from the second process stage is separated into three streams:
• a distillate stream, which is formed into diesel;
• a hydrocarbon stream rich in paraffins, which is recycled to the first process stage;
• and a hydrocarbon stream rich in olefins, which is recycled to the second process stage,
• wherein the hydrocarbon product obtained in the first process stage is separated into a liquid and a gaseous phase before introduction into the second process stage,
• the gaseous phase of the hydrocarbon product is supplied to the second process stage,
• the liquid phase of the hydrocarbon product is separated into a mixture rich in C6− hydrocarbons and a mixture containing C7+ hydrocarbons and aromatics, and
• the mixture rich in C6− hydrocarbons is supplied to the second process stage.