ACID GAS RECOVERY UTILIZING ORGANIC ACID SALTED DIAMINE
First Claim
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1. A cyclic process for the removal of sulfur dioxide from a sulfur dioxide containing gas stream using an amine absorbent medium and for the regeneration of the absorbent medium comprising:
- a) contacting the gas stream with a lean aqueous absorbing medium to absorb sulfur dioxide from the gas and to form a sulfur dioxide lean treated gas stream and spent absorbing medium, the lean aqueous absorbing medium comprising a sulfur dioxide diamine absorbent and an organic acid, the organic acid selected to convert the sulfur dioxide diamine absorbent to its half salt form;
b) steam stripping gaseous sulfur dioxide from the spent absorbing medium at a temperature to form a regenerated aqueous absorbing medium;
c) recovering the gaseous sulfur dioxide; and
,d) recycling the regenerated aqueous absorbing medium to the contacting step.
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Abstract
A process for the capture of sulfur dioxide from a gaseous stream utilizing a regenerable diamine absorbent comprising a diamine and a weak organic acid.
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17 Claims
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1. A cyclic process for the removal of sulfur dioxide from a sulfur dioxide containing gas stream using an amine absorbent medium and for the regeneration of the absorbent medium comprising:
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a) contacting the gas stream with a lean aqueous absorbing medium to absorb sulfur dioxide from the gas and to form a sulfur dioxide lean treated gas stream and spent absorbing medium, the lean aqueous absorbing medium comprising a sulfur dioxide diamine absorbent and an organic acid, the organic acid selected to convert the sulfur dioxide diamine absorbent to its half salt form; b) steam stripping gaseous sulfur dioxide from the spent absorbing medium at a temperature to form a regenerated aqueous absorbing medium; c) recovering the gaseous sulfur dioxide; and
,d) recycling the regenerated aqueous absorbing medium to the contacting step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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