VERFAHREN ZUR TEMPERATURÄNDERUNG EINES ROHRBÜNDELREAKTORS

Procedure for varying the temperature of a tube bundle reactor (1) for catalytic gas-phase reactions during start-up and shut-down of the reactor, comprises (a) changing the temperature of the heat transfer liquid during the circulation of the heat transfer liquid through a heat exchanger, and (b) passing a temperature-altering gas through the reaction tubes, at least when the heat transfer liquid is not yet or not any longer circulated. Procedure for varying the temperature of a tube bundle reactor (1) for catalytic gas-phase reactions during start-up and shut-down of the reactor, comprises (a) changing the temperature of the heat transfer liquid during the circulation of the heat transfer liquid through a heat exchanger, and (b) passing a temperature-altering gas through the reaction tubes, at least when the heat transfer liquid is not yet or not any longer circulated, where: the temperature of the temperature-altering gas (55) is limited at its entry into the reaction tubes (8) to be above a minimum value during the start-up process and to be below a maximum value during the shut-down process and/or the volume flow of the temperature-altering gas is also limited to be above a minimum value in such a manner that over each time period that begins with the first feeding of the temperature-altering gas, the time-averaged temperature alteration velocity of the temperature-altering gas does not exceed 30[deg] C/hour during its exit from the reaction tubes; and the tube bundle reactor exhibits a primary reactor part with a bundle of vertically arranged reaction tubes, an upper and a lower tube plate, which are tightly connected with the upper and the bottom ends of the reaction tubes, and a reactor jacket that encloses the tube bundle (9), and where in normal operation mode, the outer sides of the reaction tubes are flowed through by a heat transfer fluid that exhibits a melting point in the range of 100-450[deg] C and is circulated in at least a cycle through the primary part of the reactor.