Chemical reactor

A method for carrying out catalytic chemical reactions, comprising the steps of:

• feeding reactants to at least one reaction zone of a chemical reactor comprising at least two reaction zones each supporting a respective catalytic bed and a plurality of heat exchangers placed in said catalytic bed, said heat exchangers being grouped into at least two structurally independent heat exchange units;
• and
• feeding respective different operating heat exchange fluids to said heat exchange units for controlling the reaction temperature under pseudo-isothermal conditions,
• wherein said different operating heat exchange fluids are fed to the heat exchange units in said reaction zones, respectively, so that the heat exchange units of a first catalytic bed are fed in parallel by a first operating heat exchange fluid while the heat exchange units of a second catalytic bed are connected in series and flown one after the other by a second operating heat exchange fluid.