Carbon dioxide sorbents

• US 8,598,070 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:
  US13/896,907
• Publication Number:
  US 20130313473A1
• Time in Patent Office: 200 Days
• Field of Search: 423/220, 423/228, 423/230, 423/437.1, 502/400, 502/401, 502/407, 95/51, 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 functionalized adsorbent material for adsorbing CO₂ from CO₂-containing gaseous streams, which adsorbent material comprises a mesoporous silica having at least a portion of its pores functionalized with in-situ polymerized cyclic amine in which the density of amine sites of the in-situ polymerized cyclic amine is below 20.0 mmol amine/gram.

2. The functionalized adsorbent material of claim 1 wherein the density of amine sites of the in-situ polymerized cyclic amine is from about 16.5 to about 19.0 mmol amine/gram.

3. The functionalized adsorbent material of claim 1 wherein the cyclic amine of the in-situ polymerized cyclic amine is azetidine and the resulting in-situ polymerized cyclic amine is poly(azetidine).

4. The functionalized adsorbent material of claim 1 wherein the in-situ polymerized cyclic amine has a branched structure and contains primary, secondary, and tertiary amine sites.

5. The functionalized adsorbent material of claim 4 wherein the ratios of primary:

secondary;

tertiary amines in the in-situ polymerized cyclic amine ranges from between about 2;

96;

2 to about 46;

8;

46.

6. The functionalized adsorbent material of claim 1 wherein the 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.

7. The functionalized adsorbent material of claim 1 further comprising one or more additional components selected from the group consisting of amorphous silica binder, aluminum oxide binder, residual polymerization solvent, and residual polymerization initiator.