Patent ID: 7588739

Claim:
A fixed-bed multitubular reactor, comprising: a plurality of reaction tubes to be packed with a catalyst; catalyst temperature measures equipped to measure the temperature near the centre part in the radial direction of the reaction tubes; a heat-medium bath located outside of said reaction tubes; heat-medium bath temperature measures measuring temperatures of said heat-medium; at least a portion of said plurality of reaction tubes being arranged so as to be adjacent to each other to form at least one reaction tube group; wherein the catalyst temperature measures being installed in all of the plurality of the reaction tubes or at least a part of said reaction tubes forming said at least one reaction tube group, the measurement positions thereof being different from each other in the longitudinal direction of the reaction tubes; and the heat-medium bath temperature measures are equipped corresponding to the catalyst temperature measures so that the measurement positions Q thereof are set at the same height as the measurement positions P of the catalyst temperature measures.