Cansolv Technologies Inc.

Shell Global Solutions International B.v.

Michel A Ouimet

Leo Ernest Hakka

John Nicolas Sarlis

Colin Francis Ryan

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 &#x3c;10.0 at 25&#xb0; 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 &#x3c;10.0 at 25&#xb0; C. The polyamines may include diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA) or mixtures thereof.

Process for the recovery of carbon dioxide from a gas stream

A cyclic process for the removal of NOfrom a NOcontaining feed gas, and optionally removal mercury vapour and/or sulfur dioxide is provided. A process is also provided by which an iron chelate absorbent may be thermally regenerated.

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A process for recovering COfrom a feed gas stream comprises treating the feed gas stream with a regenerated absorbent comprising at least one tertiary amine absorbent having a pKfor the amino function of from about 6.5 to about 9 in the presence of an oxidation inhibitor to obtain a COrich stream and subsequently treating the COrich stream to obtain the regenerated absorbent and a COrich product stream. The feed gas stream may also include SOand/or NO.

Method for recovery of CO2 from gas streams

NO is removed from a gas stream by reacting NO with an absorbent to form a metal nitrosyl complex. The metal nitrosyl complex is reacted with sulfite and/or bisulfite to produce recoverable reaction products containing nitrogen and/or sulfur and to regenerate the reagent. The recoverable reaction products are then separated from the regenerated reagent.

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Montreal, Canada

Michel A Ouimet