Apparatus and system for swing adsorption processes related thereto

Patent metadata

Field	Value
Publication number	US-10434458-B2
Application number	US-201715670768-A
Country	US
Kind code	B2
Filing date	Aug 7, 2017
Priority date	Aug 31, 2016
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing an input feed stream through two swing adsorption systems as a purge stream to remove contaminants, such as water, from the respective adsorbent bed units. The wet purge product stream is passed to a solvent based gas treating system, which forms a wet hydrocarbon rich stream and a wet acid gas stream. Then, the wet hydrocarbon rich stream and the wet acid gas stream are passed through one of the respective swing adsorption systems to remove some of the moisture from the respective wet streams.

First claim

What is claimed is:

1. A cyclical swing adsorption process for removing contaminants from a feed stream, the process comprising:
a) performing one or more adsorption steps, wherein each of the adsorption steps comprises passing a feed stream from a solvent based gas treating system through a swing adsorption system to remove one or more contaminants from the feed stream and to form a product stream;
b) performing one or more purge steps, wherein each of the purge steps comprises passing at least a portion of the purge stream through the swing adsorption system in a counter flow direction relative to the flow of the feed stream to form a purge product stream, wherein the purge product stream is passed to the solvent based gas treating system; and
c) repeating the steps a) to b) for at least one additional cycle.

2. The cyclical swing adsorption process of claim 1 , wherein the solvent based gas treating system separates one or more contaminants from the purge product stream to form a wet hydrocarbon rich stream and a wet acid gas stream.

3. The cyclical swing adsorption process of claim 2 , wherein performing one or more adsorption steps comprises passing the wet hydrocarbon rich stream as the feed stream from the solvent based gas treating system through a first adsorbent bed unit to remove water from the wet hydrocarbon rich stream and to form a dry hydrocarbon rich stream as the product stream.

4. The cyclical swing adsorption process of claim 3 , further comprising
i) performing one or more acid gas adsorption steps, wherein each of the acid gas adsorption steps comprises passing the wet acid gas stream from the solvent based gas treating system through a second adsorbent bed unit to remove one or more contaminants from the wet acid gas stream and to form a dry acid gas stream;
ii) performing one or more acid gas purge steps, wherein each of the acid gas purge steps comprises passing the a first portion of the purge stream through the second adsorbent bed unit in a counter flow direction relative to the flow of the wet acid gas stream to form an acid gas purge product stream, wherein the acid gas purge product stream is passed to the solvent based gas treating system; and
iii) repeating the steps i) to ii) for at least one additional cycle.

5. The cyclical swing adsorption process of claim 4 , wherein greater than 95 volume % of the acid gas in the purge stream is recycled to the second adsorbent bed unit from the solvent based gas treating system in the wet acid gas stream.

6. The cyclical swing adsorption process of claim 5 , further comprising performing one or more hydrocarbon purge steps, wherein each of the hydrocarbon purge steps comprises splitting the purge stream into at least the first portion of the purge stream and a second portion of the purge stream, and passing the second portion of the purge stream through the first adsorbent bed unit in a counter flow direction relative to the flow of the wet hydrocarbon rich stream to form a hydrocarbon rich purge product stream, wherein the hydrocarbon rich purge product stream is passed to the solvent based gas treating system.

7. The cyclical swing adsorption process of claim 6 , wherein the acid gas purge product stream and the hydrocarbon rich purge product stream are combined to form the purge product stream.

8. The cyclical swing adsorption process of claim 6 , solvent based gas treating system comprises an amine unit.

9. The cyclical swing adsorption process of claim 4 , wherein the dry acid gas stream comprises predominately acid gas.

10. The cyclical swing adsorption process of claim 4 , wherein the dry hydrocarbon rich stream comprises predominately hydrocarbons.

11. The cyclical swing adsorption process of claim 4 , further comprising passing the dry acid gas stream to injection equipment.

12. The cyclical swing adsorption process of claim 1 , wherein greater than 95 volume % of the hydrocarbons in the purge stream are recycled to the first adsorbent bed unit from the solvent based gas treating system in the feed stream.

13. The cyclical swing adsorption process of claim 1 , wherein the duration of a cycle of the cyclical swing adsorption process is greater than 1 second and less than 600 seconds.

14. The cyclical swing adsorption process of claim 1 , wherein the purge stream is a hydrocarbon containing stream having greater than one volume percent hydrocarbons based on the total volume of the purge stream.

15. The cyclical swing adsorption process of claim 1 , wherein the pressure of the purge stream is in the range between 400 pounds per square inch absolute (psia) and 1,400 psia.

16. The cyclical swing adsorption process of claim 1 , wherein the duration of a cycle of the cyclical swing adsorption process is greater than 2 seconds and less than 300 seconds.

17. The cyclical swing adsorption process of claim 1 , wherein the cyclical swing adsorption process is a cyclical rapid cycle swing adsorption process.

Assignees

• Denton Robert D
• Nagavarapu Ananda K
• Kelley Bruce T
• Johnson Robert A
• Marshall Bennett D
• Exxonmobil Upstream Res Co

Inventors

• Denton Robert D
• Nagavarapu Ananda K
• Kelley Bruce T
• Johnson Robert A
• Marshall Bennett D

Classifications

• C10L2290/543

  Distillation, fractionation or rectification for separating fractions, components or impurities during preparation or upgrading of a fuel · CPC title

• C10L2290/542

  Adsorption of impurities during preparation or upgrading of a fuel · CPC title

• B01D53/1462

  Removing mixtures of hydrogen sulfide and carbon dioxide · CPC title

• B01D53/1437

  Pretreatment by adsorption · CPC title

• B01D53/0473 Primary

  Rapid pressure swing adsorption · CPC title