Abstract: A packing section intended to be installed in a casing so as to form a gas/liquid separation column comprises a block for treating a fluid that has a generally cylindrical shape extending along a longitudinal direction, the treatment block being formed by a stack of plates for treating the fluid along the longitudinal direction, the treatment block having a first disc-shaped face and a second disc-shaped face that each extend in planes parallel to one another, the treatment block having an external face extending over the perimeter of said treatment block between the first disc-shaped face and the second disc-shaped face, the packing section having at least one element for holding the treatment block that extends at least partially around the external face of the treatment block, the holding element having a portion for holding the treatment plates of the treatment block in position.