# US 9,433,892 B2 · System and process for capture of acid gasses at elevated pressure from gaseous process streams

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- Number: US 9,433,892 B2
- Document ID: US9433892B2
- Status: Granted
- Kind: B2
- Application number: 14/516,900
- Filed: 2014-10-17
- Published: 2015-02-19
- Granted: 2016-09-06
- Earliest claimed: 2010-09-10
- Assignees: Battelle Memorial Institute
- Applicants: David J. Heldebrant; Phillip K. Koech; John C. Linehan; James E. Rainbolt; Mark D. Bearden; Feng Zheng
- Inventors: David J. Heldebrant; Phillip K. Koech; John C. Linehan; James E. Rainbolt; Mark D. Bearden; Feng Zheng
- Web page: https://patentgrep.com/patent/US9433892B2

## CPC

- B01D 53/40: Acidic components (B01D53/44 takes precedence)
- B01D 53/1475: {Removing carbon dioxide}
- B01D 53/1493: {Selection of liquid materials for use as absorbents}
- B01D 53/78: with gas-liquid contact
- B01D 53/77: Liquid phase processes
- B01D 2252/20431: Tertiary amines
- B01D 2252/30: Ionic liquids and zwitter-ions
- B01D 2252/40: Absorbents explicitly excluding the presence of water
- B01D 2257/504: Carbon dioxide
- Y02C 20/40: of CO2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A system, method, and material that enables the pressure-activated reversible chemical capture of acid gasses such as CO2 from gas volumes such as streams, flows or any other volume. Once the acid gas is chemically captured, the resulting product typically a zwitterionic salt, can be subjected to a reduced pressure whereupon the resulting product will release the captures acid gas and the capture material will be regenerated. The invention includes this process as well as the materials and systems for carrying out and enabling this process.

## Claims

### Claim 1

A method for removing CO2 from a gaseous volume comprising the steps of:
contacting a dry gaseous stream or volume containing CO2 with at least one CO2 binding organic compound containing a neat (anhydrous) tertiary alkanolamine that chemically binds CO2 to form a zwitterionic product at a pressure greater than 100 psi to remove CO2 from said gaseous stream or volume;
removing said zwitterionic product from said dry gaseous stream or volume; and
depressurizing said zwitterionic product in the absence of added heat to release chemically bound CO2 therefrom to regenerate said CO2 binding organic compound.

### Claim 2 (depends on 1)

The method of claim 1, wherein said binding organic compound is a liquid.

### Claim 3 (depends on 1)

The method of claim 1, wherein said tertiary alkanolamine is selected from the group consisting of: N,N-Dimethylethanolamine (DMEA); N,N-Diethylethanolamine (DEEA), N, N-Diisopropylethanolamine (DIPEA); 2-(dimethylamino)-2-methyl-1-propanol (2-DMAM-PrOH); and combinations thereof.

### Claim 4 (depends on 1)

The method of claim 1, wherein said zwitterionic product is an alkylcarbonate.

### Claim 5

A method for chemically binding and removing CO2 from a gaseous stream or volume comprising the steps of:
binding CO2 in said gaseous stream or volume using at least one CO2 binding organic compound containing a neat tertiary alkanolamine that when mixed with a primary or secondary alcohol chemically binds CO2 in said gaseous stream or volume to form a zwitterionic product that removes the CO2 from said gaseous stream or volume; and
depressurizing said zwitterionic product in the absence of added heat to release chemically bound CO2 therefrom to regenerate said CO2 binding organic compound.