Solvent and method for removing acid gases from a gaseous mixture
AssigneeCarbon Clean Solutions Limited
InventorsPrateek Bumb, Gopi Kiran Neeliesetty
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Abstract
A solvent and method for removing carbon dioxide from a gaseous mixture flow with high carbon dioxide partial pressures are disclosed. The solvent includes a secondary or tertiary amine, an amine activator, a physical solvent (e.g., thioalkanol), and a carbonate buffer. The solvent contains less than about 60% by weight of water and is in a single liquid phase.
Claims22
A solvent for removing acid gases from a gaseous mixture consisting of:
- a secondary or tertiary amine that is between about 30 wt. % and about 45 wt. %,
- an amine promoter that is between about 5 wt. % and about 10 wt. %,
- thioalkanol that is between about 10% and 25% wt. %,
- a carbonate buffer, wherein the buffer is between 0.1 and 2.0 wt. %, and
- the solvent containing less than about 55 wt. % by weight of water,
- wherein the solvent is in a single liquid phase and the solvent has a viscosity of less than 11 cP at 40° C. in the present of less than 2.5M C02.
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A process for removal of acid gases from a gaseous mixture comprising the steps of:
- obtaining a solvent consisting of a secondary or tertiary amine that is between about 30 wt. % and about 40 wt. % of the solvent, an amine promoter that is between about 5 wt. % and about 10 wt. % of the solvent, thiodiglycol that is between about 10% and 25% wt. %, a carbonate buffer, wherein the buffer is between 0.1-2 wt. %, and the solvent containing less than about 60 wt. % by weight of water, the solvent having a temperature between about 30 C and about 65 C;
- and
- applying the solvent to a gaseous mixture comprising gases selected from the group consisting of carbon dioxide, mercapatans, hydrogen sulphide, and carbonyl sulphide;
- loading the solvent into a regeneration column with at least carbon dioxide/acid gas at a regeneration pressure between about 0 bar to about 5 bar and at a temperature between about 75° C. and about 130° C.;
- and
- heating the gas absorbed solvent to a temperature between about 65 C and about 110 C.
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A solvent for removing acid gases from a gaseous mixture consisting of:
- a tertiary amine that is about 32 wt,
- N-aminoethylpiperazine (AEP) that is between about 8 wt. %,
- thiodiglycol that is between about 20% wt. %,
- a K2C03 buffer, wherein the buffer is about 0.2 wt. %, and
- the solvent containing less than about 60 wt. % by weight of water,
- wherein the solvent is in a single liquid phase and the solvent has a viscosity of less than 11 cP at 40° C. in the presence of a C02 concentration less than 2.2M.
Dependencies are inferred from the claim text.