Cross-linked macroporous polymer used for selective removal of hydrogen sulfide from a gas stream

Patent metadata

Field	Value
Publication number	US-2018065077-A1
Application number	US-201615551323-A
Country	US
Kind code	A1
Filing date	Apr 4, 2016
Priority date	Apr 17, 2015
Publication date	Mar 8, 2018
Grant date	—

Abstract

A process is disclosed for the removal of hydrogen sulfide (H2S) from natural. This process provides for passing a natural gas feedstream comprising H2S though a regenerable adsorbent media which adsorbs H2S to provide an H2S-lean natural gas product and H2S. The regenerable adsorbent media of the present invention is a cross-linked macroporous polymeric adsorbent media

First claim

What is claimed is:

1 . A process for removing hydrogen sulfide (H 2 S) from a natural gas feedstream comprising H 2 S comprising the steps of:
(a) providing an adsorbent bed comprising a cross-linked macroporous polymeric adsorbent media, wherein said adsorbent media adsorbs H 2 S; (b) passing the natural gas feedstream through the cross-linked macroporous polymeric adsorbent bed to provide a H 2 S-lean natural gas stream and a hydrogen sulfide-loaded cross-linked macroporous polymeric adsorbent media; (c) further treating, recovering, transporting, liquefying, or flaring the H 2 S-lean natural gas stream, (d) regenerating the loaded cross-linked macroporous polymeric adsorbent media for reuse by desorbing the adsorbed H 2 S, and (e) discharging the H 2 S to be collected, flared, neutralized by caustic, converted to elemental sulfur, reinjected, or converted to sulfuric acid.

2 . The process of claim 1 wherein the natural gas stream comprises, in addition to H 2 S, one or more impurity wherein the H 2 S is selectively removed from the natural gas stream in the presence of one or more impurity.

3 . The process of claim 1 wherein the cross-linked macroporous polymeric adsorbent is a polymer of a monovinyl aromatic monomer crosslinked with a polyvinylidene aromatic compound.

4 . The process in of claim 3 wherein the monovinyl aromatic monomer comprises from 92% to 99.25% by weight of said polymer, and said polyvinylidene aromatic compound comprises from 0.75% to 8% by weight of said polymer.

5 . The process of claim 1 wherein the cross-linked macroporous polymeric adsorbent is a polymer of a member selected from the group consisting of styrene, vinylbenzene, vinyltoluene, ethylstyrene, and t-butylstyrene; and is crosslinked with a member selected from the group consisting of divinylbenzene, trivinylbenzene, and ethylene glycol dimethacrylate.

6 . The process of claim 5 wherein the cross-linked macroporous polymeric adsorbent has a total porosity of from 0.5 to 1.5 cc/g, a surface area of from 150 to 2100 m 2 /g as measured by nitrogen adsorption, and an average pore diameter of from 10 Angstroms to 100 Angstroms.

7 . The process of claim 1 wherein the cross-linked macroporous polymeric adsorbent is a polymer of styrene and is crosslinked with divinylbenzene.

8 . The process of claim 1 wherein the cross-linked macroporous polymeric adsorbent is a polymer comprising divinylbenzene and optionally ethyl styrene.

9 . The process of claim 1 wherein the regeneration of the loaded adsorbent is achieved by using heated gas and/or a radiant heat contact exchanger.

10 . The process of claim 1 wherein the regeneration of the loaded adsorbent media is achieved by a using a pressure swing adsorption (PSA) process, a temperature swing adsorption (TSA) process, or a combination thereof.

11 . The process of claim 1 wherein the regeneration of the loaded adsorbent media is achieved by a using a microwave heating system.

12 . The process of claim 1 wherein the process is continuous.

Assignees

• Dow Global Technologies Llc

Inventors

• Tan Runyu
• Goltz H Robert
• Padilla Gerardo
• Badhwar Ajay N

Classifications

• B01D53/02 Primary

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• C10L2290/12

  Regeneration of a solvent, catalyst, adsorbent or any other component used to treat or prepare a fuel · CPC title

• B01J20/28057

  Surface area, e.g. B.E.T specific surface area · CPC title

• B01D2259/4009

  using hot gas · CPC title

• B01D2259/40094

  by applying microwaves · CPC title