Patent ID: 7393470

Claim:
A process for producing synthesis gas for the Fischer-Tropsch synthesis comprising: an adsorbing step of adsorbing impurities contained in natural gas by active carbon to remove the impurities therefrom; a hydro-desulfurizing step of hydrogenating sulfur content in the natural gas in the presence of a hydrogenation catalyst under a partial pressure of hydrogen of 100 to 200 kPa and desulfurizing the sulfur content by an adsorbing agent; a hydrogen supplying step of supplying the natural gas after the hydro-desulfurizing step with hydrogen (H 2 ) in an amount of 0.05 to 0.1 mol to 1 mol of carbon (C) of hydrocarbon in the natural gas; a reaction step of reacting the natural gas, carbon dioxide, and steam in the presence of a catalyst for reforming to obtain synthesis gas for the Fischer-Tropsch synthesis; and a cooling step of cooling the synthesis gas for the Fischer-Tropsch synthesis at a cooling rate of 2000-4000° C./second.