Regenerable supported amine-polyol sorbent

• US 5,376,614 A
• Filed: 12/11/1992
• Issued: 12/27/1994
• Est. Priority Date: 12/11/1992
• Status: Expired due to Term

• Current Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Birbara, Philip J., Nalette, Timothy A.
• Primary Examiner(s): KONOPKA, PAUL
• Application Number:
  US07/989,277
• Time in Patent Office: 746 Days
• Field of Search: 502/401, 502/402, 502/62, 252/190
• US Class Current: 502/402
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01J 20/08 comprising aluminium oxide or hydroxide; comprising bauxite
• CPC Class Codes: B01J 20/165 Natural alumino-silicates, e.g. zeolites
• CPC Class Codes: B01J 20/18 Synthetic zeolitic molecular sieves
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28057 Surface area, e.g. B.E.T specific surface area
• CPC Class Codes: B01J 20/28078 Pore diameter
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/321 consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds
• CPC Class Codes: B01J 20/3248 the functional group or the linking, spacer or anchoring group as a whole comprising at least one type of heteroatom selected from a nitrogen, oxygen or sulfur, these atoms not being part of the carrier as such
• CPC Class Codes: B01J 20/3251 comprising at least two different types of heteroatoms selected from nitrogen, oxygen or sulphur
• CPC Class Codes: B01J 20/3255 comprising a cyclic structure containing at least one of the heteroatoms nitrogen, oxygen or sulfur, e.g. heterocyclic or heteroaromatic structures
• CPC Class Codes: B01J 20/3272 Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
• CPC Class Codes: B01J 20/3425 of sorbents or filter aids comprising organic materials
• CPC Class Codes: B01J 20/3483 by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
• CPC Class Codes: B01J 20/3491 by pressure treatment
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

The supported amine-polyol sorbent of the present invention comprises about 1 wt % to about 25 wt % amine, about 1 wt % to about 25 wt % polyol, with the balance being support. This sorbent is capable of absorbing and desorbing carbon dioxide at relatively high rates at ambient temperatures, thereby improving carbon dioxide sorption capacity.

Claims

1. A supported amine-polyol sorbent, comprising based on the total weight of the sorbent:

an amine/polyol mixture including from about 1 wt % to about 25 wt % amine for absorbing and desorbing carbon dioxide and water from a gaseous stream, wherein said amine is a polymer having a molecular weight greater than 500, and from about 1 wt % to about 25 wt % polyol for lowering the viscosity of the amine, enhancing carbon dioxide and water migration to the amine, and inhibiting oxidation of the amine, and

the remainder of the sorbent being a porous support for providing structural integrity to the amine/polyol mixture, said porous support having surface characteristics which adhere the amine to the support and is selected from the group consisting of ion exchange resins and polymeric absorbent resins.

2. A supported amine-polyol sorbent as in claim 1 comprising about 10 wt % to about 20 wt % polyol and about 8 wt % to about 15 wt % amine, balance support.

3. A supported amine-polyol sorbent as in claim 1, wherein said amine is polyethylene imine.

4. A supported amine-polyol sorbent as in claim 1 wherein said polyol is dimethyl ether of polyethylene glycol, glycerol, methoxy triethylene glycol diacetate, polyethylene glycol, propylene carbonate, 1,2-propylene glycol, a sugar alcohol, or mixtures thereof.

5. A supported amine-polyol sorbent as in claim 1 wherein said support is an acrylic ester polymer.