Reactor and method for carrying out a chemical reaction

A method for carrying out a chemical reaction, comprising:

• providing and using a reactor comprising a reactor vessel and one or more reaction tubes;
• wherein:
• power input elements for electrical heating of the reaction tube(s) are guided into the reactor vessel;
• the power input elements each have a rod-shaped section that in each case runs through a wall of the reactor vessel at a wall passage;
• a connection chamber into which the rod-shaped sections project is arranged outside the reactor vessel and adjacently to the wall of the reactor vessel through which the rod-shaped sections run at their wall passages;
• cooling panels through which a cooling fluid can flow are provided in the connection chamber and are arranged between at least two or between at least two groups of the rod-shaped sections that project into the connection chamber;
• and
• the reaction tube(s) is/are used as electrical resistors to generate heat.