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In a radial flow catalytic reactor, a gravity supported centerpipe is restrained from vertical upward movement due to thermal cycling of the catalyst and the reactor internals and/or the reactor and/or changes in process fluid flow conditions by forming the centerpipe with a taper, either continuous

In a radial flow catalytic reactor, a gravity supported centerpipe is restrained from vertical upward movement due to thermal cycling of the catalyst and the reactor internals and/or the reactor and/or changes in process fluid flow conditions by forming the centerpipe with a taper, either continuous or stepped to have a generally frustoconical configuration. Gravity effect of the catalyst particles forming the bed act along the tapered sides of the centerpipe. Additionally improved radial flow through the uniformly packed catalyst bed, is achieved by the tapered conical shape of the centerpipe by gradually increasing the volume of the centerpipe along the length of the catalyst bed to accommodate ever increasing fluid flow from top to bottom through the radial bed.

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A method of preventing longitudinal displacement of the centerpipe of a radial flow catalytic reactor vessel due to thermal cycling of fluids flowing therethrough and differences in thermal expansion of said centerpipe and for increasing the volume thereof for increasing radial flow of reactant flui

A method of preventing longitudinal displacement of the centerpipe of a radial flow catalytic reactor vessel due to thermal cycling of fluids flowing therethrough and differences in thermal expansion of said centerpipe and for increasing the volume thereof for increasing radial flow of reactant fluids through the catalyst bed along the length of said centerpipe which comprises positioning a centerpipe centralizing socket member in the lower end wall of said vessel, seating a centerpipe in said socket member extending axially parallel to a substantial portion of the sidewall of said vessel, said centerpipe being formed throughout its length as a frustoconical section whose diameter decreases from said socket member toward the upper end wall of said vessel and having a plurality of spaced openings throughout said length, covering at least said openings of said centerpipe with screen, enclosing said centerpipe within a generally cylindrical body of catalyst particles extending radially outward from said centerpipe adjacent to said vessel sidewall, and forming vertical passageways between said sidewall of said vessel and said body of catalyst particles to permit radial flow of reactant fluids through said body between said sidewall and said centerpipe, whereby increasing fluid flow into said centerpipe from across said body by radial flow therethrough is accommodated along the length of said frustoconical centerpipe and thermal cycling is resisted by the gravity component of said cylindrical catalyst bed along the surface of said frustoconical centerpipe. In a radial flow reactor vessel having inlet and outlet passageways, means for retaining a generally cylindrical bed of catalyst particles extending through said reactor and so arranged as to permit radial fluid flow between the peripheral area of said cylindrical bed and the center of said bed, a perforated centerpipe member extending through said catalyst bed, said reactor having a sealable across opening in the upper end of said vessel for installation and removal of said catalyst particles, said perforated centerpipe member, and said retaining means, the improvement comprising a centerpipe seat member mounted at the lower end of said vessel, said centerpipe having one end formed to engage said seat member for support thereof and the diameter of said centerpipe being tapered inwardly from above said seat to the other end thereof; screen means surrounding said centerpipe adapted to prevent catalyst particles from passing through the perforations in said centerpipe and means covering at least a portion of the upper end of said centerpipe to maintain the perforations of said centerpipe within said cylindrical bed of said catalyst particles.