AMENDED CLAIMS received by the International Bureau on 10 February 2023 (10.02.2023)

1. A plate grid distributor for distributing a fluid in a vessel, the plate grid distributor comprising: a plate comprising a top surface, a bottom surface opposite the top surface, and a plurality of apertures passing from the top surface to the bottom surface; and a skirt in direct contact with the bottom surface of the plate at or near an outer periphery of the plate, the skirt extending substantially vertically from the plate and towards a floor of the vessel, wherein the skirt comprises: a first portion in direct contact with the plate, wherein the material of the first portion has a first allowable stress; and a second portion positioned below the first portion and in direct contact with the first portion and extending downward towards the floor of the vessel, wherein the material of the second portion has a second allowable stress; and wherein the second allowable stress is greater than 3,000 psi at 1,400 °F; and wherein the second allowable stress is at least 200 psi greater than that first allowable stress at 1,400 °F.

2. The plate grid distributor of claim 1 , wherein the second allowable stress is greater than 3,200 psi at 1,400 °F.

3. The plate grid distributor of claim 1, wherein the second allowable stress is from 3350 psi to 3450 psi at 1,400 °F.

4. The plate grid distributor of any preceding claim, wherein the material of the first portion is SAE 304H stainless steel.

5. The plate grid distributor of any preceding claim, wherein the material of the second portion is INCOLOY® 800HT®.

AMENDED SHEET (ARTICLE 19) 6. The plate grid distributor of any preceding claim, wherein the skirt further comprises a third portion positioned below the second portion and in direct contact with the second portion and the floor of the vessel, wherein the material of the third portion has a third allowable stress and the third allowable stress is less than the first allowable stress at 1,400 °F.

7. The plate grid distributor of claim 6, wherein: the third portion comprises a material that is the same material as a shell of the vessel; the material of the third portion is carbon steel; or both.

8. A plenum for removing a fluid from a vessel, the plenum comprising: a plate comprising a top surface and a bottom surface opposite the top surface; and a skirt in direct contact with the top surface of the plate at or near an outer periphery of the plate, the skirt extending substantially vertically from the plate and towards a top of the vessel, wherein the skirt comprises: a first portion in direct contact with the plate, wherein the material of the first portion has a first allowable stress; and a second portion positioned above the first portion and in direct contact with the first portion and extending upward towards the top of the vessel, wherein the material of the second portion has a second allowable stress; wherein the second allowable stress is greater than 3,000 psi at 1,400 °F; and wherein the second allowable stress is at least 200 psi greater than that first allowable stress at 1,400 °F.

9. The plenum of claim 8, wherein the second allowable stress is greater than 3,200 psi at 1,400 °F.

10. A method of distributing a fluid in a vessel, the method comprising: passing a fluid into the vessel at reaction conditions through a gaseous feed conduit below the plate grid distributor;

AMENDED SHEET (ARTICLE 19) directing the fluid through a plate grid distributor in the vessel, the plate grid distributor comprising: a plate comprising a top surface, a bottom surface opposite the top surface, and a plurality of apertures passing from the top surface to the bottom surface; and a skirt in direct contact with the bottom surface of the plate at or near an outer periphery of the plate, the skirt extending substantially vertically from the plate and towards a floor of the vessel, wherein the skirt comprises: a first portion in direct contact with the plate, wherein the material of the first portion has a first allowable stress; and a second portion positioned below the first portion and in direct contact with the first portion and extending downward towards the floor of the vessel, wherein the material of the second portion has a second allowable stress; wherein the first allowable stress is 200 psi less than the second allowable stress at 1,400 °F; and wherein the second allowable stress is greater than 3,000 psi at 1,400 °F; and wherein a temperature differential between the top surface of the plate and the floor of the vessel is greater than or equal to 500 °F.

11. The method of claim 10, wherein the temperature at the top surface of the plate is greater than or equal to 1,400 °F.

12. The method of either one of claim 10 or 11, wherein the temperature at the floor of the vessel is from greater than or equal to 350 °F to less than or equal to 600 °F.

13. The method of any one of claims 10-12, wherein the skirt further comprises a third portion in direct contact with the second portion and the floor of the vessel, wherein the material of the third portion has a third allowable stress and the third allowable stress is less than the first allowable stress at 1,400 °F.

AMENDED SHEET (ARTICLE 19) 28 The method of any one of claims 10-13, wherein the material of the first portion is SAE stainless steel and the material of the second portion is INCOLOY® 800HT®. The method of claim 13, wherein the material of the third portion is carbon steel.

AMENDED SHEET (ARTICLE 19)