Synthesis gases are mixtures from hydrogen and carbon monoxide. Raw materials are solid, liquid or gaseous fuels, which react under additivation of oxygen and / or steam at higher temperatures. Often the production of synthesis gas is a very economic recycling process of residues, which can provide the basis for basic chemical products, e.g. methanol. So heavy vacuum distillation residuals from refining processes are valuable raw materials. Before selection of a synthesis gas process the feedstock basis has to be considered first.