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Methods and apparatus for separating particulates from a fluid are provided. The apparatus can include a separation section having at least one wall, a first end, a second end, and an inner metal surface exposed to an internal volume of the separation section. The apparatus can also include a fluid

Methods and apparatus for separating particulates from a fluid are provided. The apparatus can include a separation section having at least one wall, a first end, a second end, and an inner metal surface exposed to an internal volume of the separation section. The apparatus can also include a fluid discharge outlet in fluid communication with the internal volume at the first end. The apparatus can also include a particulate discharge outlet in fluid communication with the internal volume at the second end. The apparatus can also include an inlet in fluid communication with the internal volume. The inlet can be disposed intermediate the first end and the second end.

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1. An apparatus for separating particulates from a fluid, comprising: a separation section having at least one wall, a first end, a second end and an inner metal surface exposed to an internal volume of the separation section, wherein the inner metal surface comprises a carburized metal, a boronized

1. An apparatus for separating particulates from a fluid, comprising: a separation section having at least one wall, a first end, a second end and an inner metal surface exposed to an internal volume of the separation section, wherein the inner metal surface comprises a carburized metal, a boronized metal, a nitrided metal, or any combination thereof;a fluid discharge outlet in fluid communication with the internal volume at the first end;a particulate discharge outlet in fluid communication with the internal volume at the second end; andan inlet in fluid communication with the internal volume, wherein the inlet is disposed intermediate the first end and the second end;and wherein the inlet is adapted to create a vortex along the inner metal surface. 2. The apparatus of claim 1, wherein the inner metal surface comprises cobalt, chromium, tungsten, iron, manganese, molybdenum, vanadium, nickel, titanium, aluminum, copper, or any alloy thereof and optionally one or more of boron, carbon, silicon, phosphorus and sulfur. 3. The apparatus of claim 1, wherein the inner metal surface is disposed on at least a first portion of the wall and wherein the thickness of the first portion with the inner metal wall disposed thereon is greater than the thickness of a second portion of the wall. 4. The apparatus of claim 1, wherein the inlet is tangentially disposed on the wall of the separation section with respect to the inner metal surface. 5. The apparatus of claim 1, wherein the inner metal surface has a thermal conductivity of about 14 watts/m K or more. 6. The apparatus of claim 1, wherein the inner metal surface has a heat capacity of about 350 J/kg K or more. 7. The apparatus of claim 1, wherein the inner metal surface has a melting point of about 1,350° C. or more. 8. The apparatus of claim 1, wherein the inner metal surface has a Brinell hardness of about 200 or more. 9. The apparatus of claim 1, wherein the inner metal surface has a Charpy toughness of about 90 or more. 10. The apparatus of claim 1, wherein the separation section comprises a first section and a second section. 11. The apparatus of claim 10, wherein the first section is cylindrical and the second section is frustoconical. 12. The apparatus of claim 1, wherein the inlet is in fluid communication with an outlet of a fluidized catalytic cracker. 13. A method for separating particulates from a carrier fluid, comprising: introducing a particulate-fluid mixture into an inlet of a separator, the separator comprising: a separation section having at least one wall, a first end, a second end and an inner metal surface that is exposed to an internal volume of the separation section;a fluid discharge outlet in fluid communication with the internal volume at the first end;a particulate discharge outlet in fluid communication with the internal volume at the second end; andan inlet in fluid communication with the internal volume, wherein the inlet is disposed intermediate the first end and the second end, and wherein the inlet is adapted to create a vortex along the inner metal surface;separating the particulate-fluid mixture to provide a fluid product having a reduced particulate concentration relative to the particulate-fluid mixture and a particulate product;recovering the fluid product from the fluid discharge outlet; andrecovering the particulate product from the particulate discharge outlet. 14. The method of claim 13, wherein the inner metal surface comprises cobalt, chromium, tungsten, iron, manganese, molybdenum, vanadium, nickel, titanium, aluminum, copper, or any alloy thereof and optionally one or more of boron, carbon, silicon, phosphorus and sulfur. 15. The apparatus of claim 13, wherein the inner metal surface comprises a carburized metal, a boronized metal, a nitrided metal, or any combination thereof. 16. The method of claim 13, wherein the particulate-fluid mixture is at a temperature ranging from about 550° C. to about 750° C. during the separation of the particulate-fluid mixture. 17. The method of claim 13, wherein the inlet is tangentially disposed on the wall of the separation section with respect to the inner metal surface and the particulate-fluid mixture is tangentially introduced to the separator with respect to the inner metal surface through the inlet. 18. The method of claim 13, wherein the particulate-fluid mixture is provided from a fluid catalytic cracking riser, wherein the particulates comprise coked catalyst particulates and the fluid comprises a reducing environment comprising one or more hydrocarbons. 19. The method of claim 18, further comprising introducing the coked catalyst particulates to a regenerator to provide regenerated catalyst particulates after the recovering the particulate product step. 20. The method of claim 19, further comprising after the recovering the particulate product step: introducing a hydrocarbon and the regenerated catalyst particulates to the catalytic cracking riser; andcracking the hydrocarbon to provide the particulate-fluid mixture. 21. The method of claim 13, further comprising introducing the fluid product to one or more separators to provide two or more separated fluid products, wherein the separated fluid products comprise methane, ethane, ethylene, propane, propylene, or any combination thereof. 22. A fluid catalytic cracking system, comprising: a fluidized catalytic cracking riser having a product outlet in fluid communication with an inlet to a separator, wherein the separator comprises: a separation section having at least one wall, a first end, a second end and an inner metal surface that is exposed to an internal volume of the separation section, wherein the inner metal surface comprises a carburized metal, a boronized metal, a nitrided metal, or any combination thereof;a fluid discharge outlet in fluid communication with the internal volume at the first end;a particulate discharge outlet in fluid communication with the internal volume at the second end, wherein the inlet to the separator is in fluid communication with the internal volume, and wherein the inlet is disposed intermediate the first end and the second end; anda regenerator in fluid communication with the particulate discharge outlet;and wherein the inlet is adapted to create a vortex along the inner metal surface. 23. The system of claim 22, wherein the fluidized catalytic cracking riser is operated at a temperature of from about 550° C. to about 750° C. 24. The system of claim 22, wherein the inner metal surface comprises cobalt, chromium, tungsten, iron, manganese, molybdenum, vanadium, nickel, titanium, aluminum, copper, or any alloy thereof and optionally one or more of boron, carbon, silicon, phosphorus and sulfur. 25. The system of claim 22, wherein the separation section comprises a first section and a second section. 26. The system of claim 25, wherein the first section is cylindrical and the second section is frustoconical.