Process for the preparation of hydrocarbons from synthesis gas

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(57) Abstract : A process for the preparation of hydrocarbon products comprising the steps of (a) providing a synlOO thesis gas comprising hydrogen, carbon monoxide and carbon dioxide; (b) reacting the synthesis gas to an oxygenate mixture comprising methanol and dimethyl ether in presence of one or more catalysts which together catalyse a re- 97 action of hydrogen and carbon monoxide to oxygenates at a pressure of at least 4 MPa; (c) withdrawing from step (b) the oxygenate mixture comprising amounts of methanol, f J 95 dimethyl ether, carbon dioxide and water together with unI f reacted synthesis gas and introducing the entire amount of the oxygenate mixture without further treatment into a cat- g3 alytic oxygenate conversion step (d); (d) reacting the oxygenate mixture in presence of a catalyst being active in the conversion of oxygenates to higher hydrocarbons; (e) withdrawing an effluent from step (d) and separating the effluent into a tail gas, a liquid hydrocarbon phase containing the higher hydrocarbons produced in step.(d) and a liquid 80 90 100 110 120 130 140 Synthesis Pressure [ bar abs ] aqueous phase, wherein the pressure employed in steps (c) to (e) is substantially the same as employed in step (b). Fig. I. Oxygenate (Methanol/DME) synthesis : H2+CO equilibrium conversion curve. Temperature : 240°C; synthesis gas composition (mole-%) : H 2 /CO/COz/CH 4 = 47/45/4/4.