Adsorption process for treating natural gas

Patent metadata

Field	Value
Publication number	US-2020002633-A1
Application number	US-201916392314-A
Country	US
Kind code	A1
Filing date	Apr 23, 2019
Priority date	Jun 27, 2018
Publication date	Jan 2, 2020
Grant date	—

Abstract

A process of treating a natural gas stream is provided comprising sending natural gas stream through a first adsorbent bed to remove water and heavy hydrocarbons (C8+) to produce a partially treated gas stream in which the first adsorbent bed is regenerated by a temperature swing adsorption process and then sending the partially treated gas stream through a second adsorption bed to remove carbon dioxide and lighter hydrocarbons (C7−) to produce a purified natural gas stream wherein said second adsorption bed is regenerated by a temperature pressure swing adsorption process.

First claim

1 . A process of treating a natural gas stream comprising
sending said natural gas stream through a first adsorbent bed to remove water and heavy hydrocarbons (C8+) to produce a partially treated gas stream wherein said first adsorbent bed is regenerated by a temperature swing adsorption process; and sending said partially treated gas stream through a second adsorption bed to remove carbon dioxide and lighter hydrocarbons (C7−) to produce a purified natural gas stream wherein said second adsorption bed is regenerated by a temperature pressure swing adsorption process.

2 . The process of claim 1 wherein said natural gas stream comprises less than about 3 vol % carbon dioxide.

3 . The process of claim 1 wherein a closed loop or semi-closed loop regeneration gas stream is used to regenerate said second adsorbent bed.

4 . The process of claim 3 wherein a semi-closed loop regeneration gas stream is used to regenerate said second adsorbent bed.

5 . The process of claim 1 wherein said temperature pressure swing adsorption process comprises a series of steps in order comprising adsorption, co-current depressurization, closed-loop heating, a purge with heating, a purge without heating, repressurization of the adsorbent bed and cooling with feed and then withdrawal of product.

6 . The process of claim 1 wherein said temperature pressure swing adsorption process comprises a series of steps in order comprising adsorption, co-current depressurization, a first closed loop heating step and a second closed loop heating step, a depressurization step, a purge without heat, repressurization and cooling with feed and withdrawal of product.

7 . The process of claim 5 wherein a portion of said product is used in said purge without heating step.

8 . The process of claim 6 wherein a portion of said product stream is heated and sent through said adsorbent bed.

9 . The process of claim 8 wherein a stream exiting said adsorbent bed is sent into said adsorbent bed or into a second adsorbent bed.

10 . The process of claim 5 wherein said heating step is at a higher pressure than said purge step.

Assignees

• Uop Llc

Inventors

• Doong Shain-Jer
• Davis Mark M
• Sharma Bhargav C

Classifications

• B01D53/0462 Primary

  Temperature swing adsorption · CPC title

• B01D53/047

  Pressure swing adsorption · CPC title

• B01D2259/40079

  Co-current · CPC title

• B01D2259/40052

  Recycled product or process gas · CPC title

• B01D2257/504

  Carbon dioxide · CPC title