Carbon dioxide and other acid gases are removed from gaseous streams using aqueous absorption and stripping processes. By replacing the conventional stripper used to regenerate the aqueous solvent and capture the acid gas with a matrix stripping configuration, less energy is consumed. The matrix stripping configuration uses two or more reboiled strippers at different pressures. The rich feed from the absorption equipment is split among the strippers, and partially regenerated solvent from the highest pressure stripper flows to the middle of sequentially lower pressure strippers in a “matrix” pattern. By selecting certain parameters of the matrix stripping configuration such that the total energy required by the strippers to achieve a desired percentage of acid gas removal from the gaseous stream is minimized, further energy savings can be realized.
Gary Rochelle - Austin TX, US Marcus Hilliard - Missouri City TX, US
Assignee:
Board of Regents, The University of Texas System - Austin TX
International Classification:
B01D 53/14
US Classification:
95159, 95169, 95236, 423228, 252 60
Abstract:
Compositions and methods related to the removal of acidic gas. In particular, the present disclosure relates to a composition and method for the removal of acidic gas from a gas mixture using a solvent comprising a diamine (e. g. , piperazine) and carbon dioxide. One example of a method may involve a method for removing acidic gas comprising contacting a gas mixture having an acidic gas with a solvent, wherein the solvent comprises piperazine in an amount of from about 4 to about 20 moles/kg of water, and carbon dioxide in an amount of from about 0. 3 to about 0. 9 moles per mole of piperazine.
Polyamine/Alkali Salt Blends For Carbon Dioxide Removal From Gas Streams
Gary T. Rochelle - Austin TX, US John Cullinane - Houston TX, US
Assignee:
The Board of Regents of the University of Texas System - Austin TX
International Classification:
B01D 53/14
US Classification:
95236, 423228
Abstract:
Novel solvents and methods of use for the removal of COfrom flue gas, natural gas, hydrogen gas, synthesis gas, and other process and waste gas streams are provided. The solvent contains an alkali salt such as potassium carbonate and a polyamine such as piperazine (PZ) where the polyamine concentration is at least 1. 5 equivalents/Kg HO and the alkali salt concentration is at least 0. 5 equivalents/Kg HO. The preferred alkali salt/polyamine ratio is from approximately 1:2 to 2:1, and no additional alcohol is required for solubilizng the PZ. This chemical solvent and method of use provides efficient and effective removal of COfrom gaseous streams and other sources.
Polyamine/Alkali Salt Blends For Carbon Dioxide Removal From Gas Streams
Gary T. Rochelle - Austin TX, US John Cullinane - Houston TX, US
Assignee:
The Board of Regents of the University of Texas System - Austin TX
International Classification:
B01D 53/14
US Classification:
252 60, 95155, 95236, 252184, 423228
Abstract:
Novel solvents and methods of use for the removal of COfrom flue gas, natural gas, hydrogen gas, synthesis gas, and other process and waste gas streams are provided. The solvent contains an alkali salt such as potassium carbonate and a polyamine such as piperazine (PZ) where the polyamine concentration is at least 1. 5 equivalents/Kg HO and the alkali salt concentration is at least 0. 5 equivalents/Kg HO. The preferred alkali salt/polyamine ratio is from approximately 1:2 to 2:1, and no additional alcohol is required for solubilizing the PZ. This chemical solvent and method of use provides efficient and effective removal of COfrom gaseous streams and other sources.
Gary Rochelle - Austin TX, US Stephanie Freeman - Austin TX, US Xi Chen - Austin TX, US Thu Nguyen - Austin TX, US Alexander Voice - Austin TX, US Humera Rafique - Austin TX, US
International Classification:
B01D 53/62 B01F 1/00
US Classification:
423228, 252364
Abstract:
Compositions and methods related to the removal of acidic gas. In one embodiment, compositions and methods are provided for the removal of acidic gas from a gas mixture using an aqueous amine solvent comprising water, a first amine, and a second amine, wherein the first amine contributes at least 50% by weight of the solvent's total amine concentration.
Process For Removing Sulfur From Sulfur-Containing Gases: High Calcium Fly-Ash
Gary T. Rochelle - Austin TX John C. S. Chang - Cary NC
Assignee:
Board of Regents, The University of Texas System - Austin TX
International Classification:
B01J 800 C01B 1700
US Classification:
423242
Abstract:
The present disclosure relates to improved processes for treating hot sulfur-containing flue gas to remove sulfur therefrom. Processes in accordance with the present invention include preparing an aqueous slurry composed of a calcium alkali source and a source of reactive silica and/or alumina, heating the slurry to above-ambient temperatures for a period of time in order to facilitate the formation of sulfur-absorbing calcium silicates or aluminates, and treating the gas with the heat-treated slurry components. Examples disclosed herein demonstrate the utility of these processes in achieving improved sulfur-absorbing capabilities. Additionally, disclosure is provided which illustrates preferred configurations for employing the present processes both as a dry sorbent injection and for use in conjunction with a spray dryer and/or bagfilter. Retrofit application to existing systems is also addressed.
Process For Removing Sulfur From Sulfur-Containing Gases
Gary T. Rochelle - Austin TX Wojciech Jozewicz - Chapel Hill NC
Assignee:
Board of Regents, The University of Texas System - Austin TX
International Classification:
C01B 1700 B01J 800
US Classification:
423242
Abstract:
The present disclosure relates to improved processes for treating hot sulfur-containing flue gas to remove sulfur therefrom. Processes in accorda The government may own certain rights in the present invention pursuant to EPA Cooperative Agreement CR 81-1531.
Process For Removing Sulfur From Sulfur-Containing Gases
Gary T. Rochelle - Austin TX Wojciech Jozewicz - Chapel Hill NC
Assignee:
Board of Regents, The University of Texas System - Austin TX
International Classification:
C01B 1700 B01J 800
US Classification:
423242
Abstract:
The present disclosure relates to i The government may own certain rights in the present invention pursuant to EPA Cooperative Agreement CR 81-1531. This is a continuation of U. S. Ser. No. 928,337, filed Nov. 7, 1986, now U. S. Pat. No. 4,804,521.
Gary Rochelle (1967-1971), June Gresham (1967-1971), Pamela Mosley (1971-1975), Samuel Scott (1970-1974), Stacey Hausgen (1979-1983), Sandy Anderson (1962-1966)
cheap. The consumers [are] going to see an increase in the cost of electricity of 5 to 10 cents per kilowatt hour, said Gary Rochelle, a chemical engineer at the University of Texas in Austin who has developed a technology to rinse carbon dioxide out of power plant smokestack emissions. Thats aNot everyone shares his optimism for clear federal policy, however. Were still five years away (from implementing CCS technology), said Gary Rochelle. Five years ago we were five years away, and until we pass cap-and-trade legislation, well always be five years away.