Method to decrease decomposition products in solutions that absorb acidic gases such as carbon dioxide and the like in the presence of oxygen
AssigneeHuntsman Petrochemical Corporation
InventorsPatrick E. Holub, Robert A. Grigsby, Jr., Larry R. White, James E. Critchfield
Life of this patent
Estimating the term…
Abstract
An amine solvent solution that is useful in absorbing acid gases from a liquid or gas feed stream may have an amine additive added thereto. Additionally or alternatively, the amine additive may be added to a liquid or gas feed stream. The addition of the amine additive decreases the presence of amine-derived contaminants and/or degradation of amine in the amine solvent solution. As such, the amine solvent solution is available for effective reuse in treating the liquid or gas feed stream and there may be a decrease in the corrosion within an amine treating system.
Claims19
A method comprising:
- treating a liquid or gas feed stream with an amine solvent solution having one or more alkanolamines;
- adding an amine additive to the amine solvent solution, the liquid or gas feed stream, or both, wherein the amine additive includes tetraethylenepentamine, and wherein the tetraethylenepentamine is selected from the group consisting of:
- N-(2-aminoethyl)-N′-{2-{(2-aminoethyl)amino}ethyl}-1,2-ethanediamine), 4-(2-aminoethyl)-N-(2-aminoethyl)-N′-{2-{(2-aminoethyl)amino}ethyl}-1,2-ethanediamine), 1-(2-aminoethyl)-4-[[(2-aminoethyl)amino]ethyl]-piperazine), 1-[2-[[(2-aminoethyl)amino]ethyl]-amino]ethyl]-piperazine, and combinations thereof;
- and
- in response thereto, decreasing the presence of an amine-derived contaminant, decreasing degradation of the amine in the amine solvent solution, or both as compared to that which would have occurred in an amine additive-free amine solvent solution, liquid or gas, or both.
A composition comprising:
- an amine additive comprising tetraethylenepentamine, wherein the tetraethylenepentamine is selected from the group consisting of:
- N-(2-aminoethyl)-N′-{2-{(2-aminoethyl)amino}ethyl}-1,2-ethanediamine), 4-(2-aminoethyl)-N-(2-aminoethyl)-N′-{2-{(2-amino}ethyl}-1,2-ethanediamine), 1-(2-aminoethyl)-4-[[(2-aminoethyl)amino]ethyl]-piperazine), 1-[2-[[(2-aminoethyl)amino]ethyl]-amino]ethyl]-piperazine, and combinations thereof;
- an amine solvent solution selected from the group consisting of:
- monoethanolamine, diethanolamine, triethanolamine, dimethylethanolamine, N-methyldiethanolamine, monomethylethanolamine, 2-(2-aminoethoxy)ethanol, aminoethylethanolamine, diisopropanolamine, derivatives thereof, and combinations thereof;
- and
- water.
A method of treating a feed stream, comprising:
- mixing the feed stream with an amine solvent solution having one or more alkanolamines;
- adding an amine additive to the amine solvent solution, the feed stream, or both, wherein the amine additive includes a tetraethylenepentamine, and wherein the tetraethylenepentamine is selected from the group consisting of:
- N-(2-aminoethyl)-N′-{2-{(2-aminoethyl)amino}ethyl}-1,2-ethanediamine), 4-(2-aminoethyl)-N-(2-aminoethyl)-N′-{2-{(2-aminoethyl)amino}ethyl}-1,2-ethanediamine), 1-(2-aminoethyl)-4-[[(2-aminoethyl)amino]ethyl]-piperazine), 1-[2-[[(2-aminoethyl)amino]ethyl]-amino]ethyl]-piperazine, and combinations thereof.
Dependencies are inferred from the claim text.