Fixed-bed tubular reactor comprising a make-up chamber

A fixed-bed tubular reactor which extends, along a longitudinal axis, between a first end and a second end, the reactor comprising a bed of catalytic powder confined in an annular space delimited by an external wall of a hollow tube and an internal wall of a hollow insert disposed coaxially in the hollow tube,

• the hollow insert comprising at least one distribution chamber and at least one collection chamber, separated from each other by at least one first separating wall, the at least one distribution chamber and the at least one collection chamber comprising, respectively, a gas admission opening at the first end and a gas evacuation opening at the second end,
• wherein the reactor further comprises at least one make-up chamber separated from the at least one distribution chamber and from the at least one collection chamber by at least one first separating wall, the at least one make-up chamber comprising an inlet orifice for at least one make-up fluid, distinct from the gases circulating in the at least one distribution chamber and in the at least one collection chamber, at the first end and an outlet orifice of the at least one make-up fluid at the second end.