System and method for containing an emission of sulfur trioxide

• US 9,890,042 B2
• Filed: 12/09/2015
• Issued: 02/13/2018
• Est. Priority Date: 12/09/2015
• Status: Active Grant

• Current Assignee: Chevron Phillips Chemical Company LP (Chevron Corp.)
• Original Assignee: Chevron Phillips Chemical Company LP (Chevron Corp.)
• Inventors: Hasenberg, Daniel M.
• Primary Examiner(s): DAVIS, SHENG HAN
• Application Number:
  US14/963,795
• Publication Number:
  US 20170166448A1
• Time in Patent Office: 797 Days
• Field of Search: None
• CPC Class Codes: B01D 2252/2056 Sulfur compounds, e.g. Sulfolane, thiols
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 53/1481 Removing sulfur dioxide or sulfur trioxide
• CPC Class Codes: C01B 17/69 Sulfur trioxide; Sulfuric acid

Abstract

A system for containing an emission of sulfur trioxide, the system comprising a first pressurized vessel, the first pressurized vessel containing sulfur trioxide, a relief vessel containing a volume of a solvent solution, wherein the solvent solution comprises sulfolane, and a first relief conduit providing a first route of fluid communication between the first pressurized vessel and the relief vessel. A method for containing an emission of sulfur trioxide, the method comprising routing a first relief conduit so as to provide a first route of fluid communication between a first pressurized vessel and a relief vessel, wherein the first pressurized vessel contains sulfur trioxide, wherein the relief vessel contains a volume of a solvent solution, and wherein the solvent solution comprises sulfolane.

Claims

1. A method for containing an emission of sulfur trioxide, the method comprising:

routing a first relief conduit so as to provide a first route of fluid communication between a first pressurized vessel and a relief vessel, wherein the first pressurized vessel is a first reactor and contains sulfur trioxide that is a component of a reaction mixture contained within the first reactor, wherein the relief vessel contains a volume of a solvent solution, and wherein the solvent solution comprises sulfolane and up to 3 wt % water on a basis of the sulfolane; and

introducing asphalt into the first reactor.

2. The method of claim 1, wherein the first pressurized vessel is a storage vessel.

3. The method of claim 2, wherein the storage vessel includes an internal heating element configured to heat the sulfur trioxide.

4. The method of claim 2, further comprising:

routing a second relief conduit so as to provide a second route of fluid communication between a second pressurized vessel and the relief vessel, wherein the second pressurized vessel contains sulfur trioxide.

5. The method of claim 4, wherein the second pressurized vessel is a second reactor, and wherein the method further comprises communicating the sulfur trioxide from the storage vessel to the second reactor.

6. The method of claim 1, further comprising controlling fluid communication via the first route of fluid communication between the first pressurized vessel and the relief vessel via a pressure relief valve.

7. The method of claim 1, further comprising reacting the sulfur trioxide with the asphalt to yield a sulfonated asphalt.

8. The method of claim 1, further comprising maintaining the solvent solution at about atmospheric pressure and at a temperature that is about the freezing point of the solvent solution.

9. A method for containing an emission of sulfur trioxide, the method comprising:

directing an emission of sulfur trioxide from a first pressurized vessel to a relief vessel via a first relief conduit, wherein the relief vessel contains a volume of a solvent solution comprising sulfolane and up to 3 wt % water on a basis of the sulfolane;

forming an emission mixture comprising sulfur trioxide dissolved in sulfolane within the relief vessel; and

adding water to the emission mixture.

10. The method of claim 9, further comprising conveying the emission mixture to a solvent regeneration system.

11. The method of claim 10, wherein the solvent regeneration system is configured to regenerate the sulfolane using at least one of a distillation column, a back-extraction column, an adsorption column, or a counter-ion exchange column.

12. The method of claim 10, further comprising recycling a regenerated sulfolane effluent from the solvent regeneration system to the relief vessel.

13. The method of claim 9, further comprising regenerating the solvent solution from the emission mixture, wherein regenerating the solvent solution comprises removing sulfuric acid from the emission mixture after adding water to the emission mixture.

14. The method of claim 9, wherein the water is added to the emission mixture over an extended period of time and in a controlled manner to allow heat produced by an ensuing reaction to dissipate.

15. A method for containing an emission of sulfur trioxide, the method comprising:

directing an emission of sulfur trioxide from a first pressurized vessel to a relief vessel via a first relief conduit, wherein the relief vessel contains a volume of a solvent solution comprising sulfolane and up to 3 wt % water on a basis of the sulfolane, and wherein the solvent solution further comprises a dispersed fluid comprising at least one of a linear alkane hydrocarbon in the C₁₀-C₁₄ range or an isoparraffin in the C₁₂-C₁₈ range; and

forming an emission mixture comprising sulfur trioxide dissolved in sulfolane within the relief vessel.

16. The method of claim 15, wherein the solvent solution comprises one of 5 wt % dispersed fluid, 2.5 wt % dispersed fluid, 2 wt % dispersed fluid, or 1 wt % dispersed fluid.

17. The method of claim 15, wherein the solvent solution comprises less than about 1 wt % dispersed fluid.

18. The method of claim 15, further comprising conveying the emission mixture to a solvent regeneration system.

19. A method for containing an emission of sulfur trioxide, the method comprising:

routing a first relief conduit so as to provide a first route of fluid communication between a first pressurized vessel and a relief vessel, wherein the first pressurized vessel is a storage vessel and contains sulfur trioxide, wherein the relief vessel contains a volume of a solvent solution, and wherein the solvent solution comprises sulfolane and up to 3 wt % water on a basis of the sulfolane;

routing a second relief conduit so as to provide a second route of fluid communication between a second pressurized vessel and the relief vessel, wherein the second pressurized vessel contains sulfur trioxide; and

wherein sulfur trioxide from the second pressurized vessel is routed to the relief vessel via a bubbler.