Tapered conduits for reactors

1. An apparatus in a radial reactor comprising:

a vertically elongated conduit extending around a circumference of an outer wall of said radial reactor wherein a distance measured from one side of said vertically elongated conduit to an opposite side of said vertically elongated conduit at a top of said vertically elongated conduit is different than a distance measured at a lower location on said vertically elongated conduit, and wherein said vertically elongated conduit has a riser at a top; and

a vertically oriented center pipe in said radial reactor; and

a catalyst bed defined by the cylindrical center pipe and an inner side of said vertically elongated conduit, wherein a distance from the cylindrical center pipe to the inner side of the vertically elongated conduit at a top of the catalyst bed is different from a distance measured at a lower location of the catalyst bed;

wherein when the distance at the top of said vertically elongated conduit is greater than the distance at the lower location, the distance at the top of the catalyst bed is less than the distance at the lower location; and

wherein when the distance at the top of said vertically elongated conduit is less than the distance at the lower location, the distance at the top of the catalyst bed is greater than the distance at the lower location.

2. The apparatus of claim 1 wherein a vapor inlet is at a bottom of said apparatus or at a top of said apparatus.

3. The apparatus of claim 1 wherein said radial reactor has an inner reaction zone disposed within a reactor vessel, and where a front face of said vertically elongated conduit has a flat structure and a rear face has a curved structure or a flat structure.

4. The apparatus of claim 1 wherein said radial reactor has an inner reaction zone disposed within a reactor vessel, and where said vertically elongated conduit has a front face that has a curved structure and said vertically elongated conduit has a rear face that has a curved structure or a flat structure.

5. The apparatus of claim 1 wherein said vertically elongated conduit comprises a front face comprising a surface comprising apertures, two side faces, and a rear face and two ends, wherein a first end of said front face closest to a vapor inlet and a first end of said rear face closest to said vapor inlet are a distance D 1 apart and wherein a second end of said front face and a second end of said rear face are a distance D 2 apart wherein D 1 is greater than D 2 and wherein a riser is connected to a top surface of said vertically elongated conduit to allow a gas stream to flow through said riser to said vertically elongated conduit.

6. The apparatus of claim 5 wherein a ratio of D 1 to D 2 is between about 1.1 to 10.

7. The apparatus of claim 5 wherein said surface comprising apertures comprises a screen.

8. The apparatus of claim 2 further comprising support bars disposed within the vertically elongated conduit to provide rigidity.

9. A radial flow apparatus comprising:

a vertically oriented, substantially cylindrical vessel having a fluid inlet and a fluid outlet;

a vertically oriented center pipe disposed within the vessel and having a fluid inlet and a fluid outlet, where either the fluid inlet or fluid outlet comprises apertures in the center pipe wall; and

at least one vertical outer duct arranged circumferentially around the interior of the vessel wall;

wherein said at least one vertical outer duct comprises a front face, two side faces, and a rear face, where the rear face is proximate to the vessel wall, and the front face comprises a plate having apertures defined therein; wherein a first end of said front face and a corresponding first end of said rear face are a distance D 1 apart and wherein a second end of said front face and a corresponding second end of said rear face are a distance D 2 apart wherein D 1 is greater than D 2 , and wherein said vertically elongated inlet conduit has a riser from a top;

a catalyst bed defined by the space between said front face of said vertical outer duct and a wall of the center pipe; and

wherein the distance at the top of the catalyst bed is less than the distance at the lower location.

10. The apparatus of claim 9 wherein the rear face and side faces of the vertically elongated inlet conduits are non-perforated surfaces.

11. The apparatus of claim 9 where the fluid inlet communicates with the interior of the at least on vertical duct and the center pipe communicates with the fluid outlet to create a radially inward fluid flow path through the catalyst bed.

12. The apparatus of claim 9 further comprising an inlet for solid particles and an outlet for solid particles, wherein the inlet and outlet are in fluid communication with the catalyst bed.

13. An apparatus in a radial reactor comprising:

a vertically elongated conduit comprising a front face comprising a surface comprising apertures, two side faces, and a rear face, wherein a bottom of said front face and a bottom of said rear face are a distance D 1 apart and wherein a top of said front face and a top of said rear face are a distance D 2 apart wherein D 1 is greater than D 2 and wherein a riser is connected to a top surface of said vertically elongated conduit to allow a gas stream to flow through said riser to said vertically elongated conduit;

a vertically oriented center pipe in said radial reactor; and

a catalyst bed defined by the cylindrical center pipe and an inner side of said vertically elongated conduit, wherein a distance from the cylindrical center pipe to the inner side of the vertically elongated conduit at a top of the catalyst bed is different from a distance measured at a lower location of the catalyst bed;

wherein the distance at the top of the catalyst bed is greater than the distance at the lower location.

14. The apparatus of claim 13 wherein said apparatus has a vapor inlet on a bottom of said apparatus.