Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Reexamination Certificate
2006-12-28
2009-10-13
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
Reexamination Certificate
active
07601315
ABSTRACT:
A process for removing acid gas from a gas stream utilizes a low viscosity absorbent comprising a solution of at least one selected amine. The absorbent may include (1) at least one polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, wherein the polyamine has at least one primary amine functionality having a pKa of <10.0 at 25° C. and wherein the feed gas stream has an SO2 concentration less than 5 ppm vol.; or (2) a polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, wherein the polyamine has at least one secondary amine functionality having a pKa for each sorbing nitrogen of <10.0 at 25° C. The polyamines may include diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA) or mixtures thereof.
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Bereskin & Parr LLP
Cansolv Technologies Inc.
Mendes da Costa Philip C.
Vanoy Timothy C
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