Carbon dioxide sorbents

• US 8,598,071 B1
• Filed: 05/17/2013
• Issued: 12/03/2013
• Est. Priority Date: 12/22/2009
• Status: Expired due to Fees

• Current Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Inventors: Baugh, Lisa S., Calabro, David C., Li, Quanchang, Berluche, Enock
• Primary Examiner(s): Zimmer, Anthony J
• Application Number:
  US13/896,954
• Publication Number:
  US 20130317180A1
• Time in Patent Office: 200 Days
• Field of Search: 423/220, 423/228, 423/230, 423/437.1, 502/401, 502/407, 95/90, 951/39, 952/36
• US Class Current: 502/407
• CPC Class Codes: B01D 2252/20415 Tri- or polyamines
• CPC Class Codes: B01D 2252/20421 Primary amines
• CPC Class Codes: B01D 2252/20426 Secondary amines
• CPC Class Codes: B01D 2252/20431 Tertiary amines
• CPC Class Codes: B01D 2252/20436 Cyclic amines
• CPC Class Codes: B01D 2258/0283 Flue gases
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01J 20/103 comprising silica
• CPC Class Codes: B01J 20/265 modified or post-treated polymers polymer carriers or substrates subjected to further impregnating or coating B01J20/3208
• CPC Class Codes: B01J 20/2803 Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/2805 Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane
• CPC Class Codes: B01J 20/28057 Surface area, e.g. B.E.T specific surface area
• CPC Class Codes: B01J 20/28083 being in the range 2-50 nm, i.e. mesopores
• CPC Class Codes: B01J 20/28097 being coated, filled or plugged with specific compounds
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3272 Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
• CPC Class Codes: C08G 73/0206 Polyalkylene(poly)amines
• CPC Class Codes: C08G 73/0213 Preparatory process
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 : Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

Improved CO₂ sorbents comprised of a mesoporous silica functionalized with a polyamine are obtained by the in-situ polymerization of azetidine. Also included herein are processes utilizing the improved CO₂ sorbents wherein CO₂ is chemisorbed onto the polyamine portion of the sorbent and the process is thermally reversible.

Claims

1. A method of preparing a functionalized adsorbent material comprised of a cyclic amine polymer for removing CO₂ from CO₂-containing gaseous streams, which method comprises:

forming a mixture comprised of a cyclic amine, a Brø

nsted acid initiator in a solvent, and a mesoporous silica;

forming the cyclic amine polymer in the presence of the mesoporous silica; and

retrieving the resultant functionalized adsorbent material from the mixture as a solid;

wherein the resulting cyclic amine polymer has an amine density of below about 20.0 mmol amine/gram.

2. The method of claim 1 wherein the cyclic amine polymer has a density of amine sites from about 16.5 to about 19.0 mmol amine/gram.

3. The method of claim 1 wherein the cyclic amine is azetidine and the cyclic amine polymer is poly(azetidine).

4. The method of claim 1 wherein the Brø

nsted acid initiator is selected from the group consisting of acetic acid and perchloric acid.

5. The method of claim 1 wherein the molar ratio of cyclic amine to Brø

nsted acid initiator is from about 8;

1 to about 30;

1.

6. The method of claim 1 wherein the mixture is at a temperature of from about 20°

C. to about 120°

C.

7. The method of claim 1 wherein the solvent is selected from the group consisting of toluene and methanol.

8. The method of claim 1 wherein the resultant functionalized adsorbent material has a BET surface area from about 100 m²/g to about 1500 m²/g, and a pore volume from about 0.3 cc/g to about 1.8 cc/g.