Device allowing the temporary storage and putting back into circulation of a certain quantity of catalyst in catalytic reforming installations

A catalytic reactor having a ring-shaped moving bed catalyst, limited at its outer periphery by walls forming a cylindrical basket (5), and at its internal periphery by a central collector (3), with the catalyst flowing slowly by force of gravity into the space between the basket (5) and the central collector (3), and circulating downwards through circulation legs (2) positioned on the substantially hemispherical base of said reactor, said basket (5) being movable along a substantially vertical axis over a distance of from a few centimeters to 10 cm, this basket (5) being equipped with flaps (7) themselves substantially vertical, positioned on the lower part of the basket (5), in the extension of a wall having flaps (7), in which reactor, when there is an interruption in the circulation of the catalyst, a catalyst storage space (11) situated in the lower part of the reactor adjoining the wall, and close to dip legs (2), is released by moving the basket (5) and attached flaps (7) assembly upwards, flaps (7) being equipped with a deflector (15) rigidly or freely attached, and which forms an angle alpha with the vertical of between 30 and 60°.