NOVELTY - The desulfurizer (1) has a cylindrical main structure (11) that accommodates desulfurization catalyst which removes sulfur contained in hydrocarbon raw material. Several jackets (12) are arranged in parallel in the outer periphery of main structure, such that the inner surface (12a) of each jacket contacts the outer peripheral surface (11d) of the main structure. The jackets are heated by a heater (13). An elastic connection element (15) is used for connecting the adjacent jackets.    USE - Desulfurizer for desulfurization of hydrocarbon raw material e.g. kerosene used in fuel cell system. Can also be used in desulfurization of hydrocarbon raw material such as gaseous and liquid hydrocarbon mixtures e.g. light oil, fuel oil, asphaltene, oil extracted from oil-sand, methanol, naphtha, liquid coal, coal-based heavy oil, petrol, town gas and liquefied petroleum gas (LPG), and jet fuel production apparatus and diesel fuel production apparatus.    ADVANTAGE - The adhesiveness of the main structure and jacket can be improved at the time of heating, by provision of the elastic connection elements. The heat can be easily transmitted from the jacket to the main structure, even if the thermal expansions of the main structure and jacket differ. The desulfurization catalyst in the main structure can be heated uniformly while increasing the heating efficiency of the main structure.    DETAILED DESCRIPTION - The connection element connects the adjacent jackets such that the tensile force of the connection element acts between the jackets. The inner surface of the jacket is curved corresponding to the outer surface of the main structure. The main structure includes desulfurization chamber that is filled with desulfurization catalyst. A pre-heating chamber heats the hydrocarbon raw material. The hydrocarbon raw material is supplied to the desulfurization chamber through the preheating chamber. The desulfurized raw material in the desulfurization chamber is discharged from the main structure through a discharge pipe which passes through the preheating chamber.    DESCRIPTION OF DRAWING(S) - The drawing shows the top view of the desulfurizer.    Desulfurizer (1)    Main structure (11)    Outer peripheral surface of main structure (11d)    Jacket (12)    Inner surface of jacket (12a)    Heater (13)    Connection element (15)