The present invention is a fixed bed reactor regarding (51) having one or more bypass apparatus for extending the reactor operating life. Bypass device is arranged in a fixed catalyst bed (56) in the floor (56), it may be divided into a first top floor (58) and a second virtual floor (59). One embodiment of the bypass device, when the fixed catalyst bed (56) is fouling, the fluid raw material, and the first bypass the top floor (58) of the fixed catalyst bed (56), the foulant the bypass flow if included, than the second gap of the virtual floor (59), under conditions in which the second deposition at the top on the surface of the virtual floor (59) is promoted, the second virtual floor (59) It makes it possible to enter. Other embodiments, when successive layers of the fixed bed is fouling relates to a multi-stage bypass it is possible starting fluid material to bypass them. The present invention also relates to an improved fixed bed reactor containing a bypass apparatus of the present invention, and uses the bypass device of the present invention relates to a method of extending the fixed bed reactor operating life.
.FIELD 1