Low-foaming gas processing compositions and uses thereof
AssigneeMomentive Performance Materials Inc.
InventorsKalman Koczo, David George Quinn
Life of this patent
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Abstract
The invention relates to low-foaming gas processing compositions comprising (a) a silicone antifoam component comprising a base silicone fluid and a particulate metal oxide; (b) an emulsifying component in an amount suitable for the at least substantial emulsification of the silicone antifoam component in water; (c) a polypropylene glycol component at least partially soluble, emulsifiable, and/or dispersible in water; (d) a water-soluble or water-dispersible gas processing agent; and (e) water. The invention also relates to methods for processing a gas by treating the gas with these foam suppressing compositions.
Claims21
A low-foaming gas processing composition consisting essentially of:
- (a) a silicone antifoam component comprising a base silicone fluid and a particulate metal oxide;
- (b) an emulsifying component in an amount suitable for the at least substantial emulsification of the silicone antifoam component in water;
- (c) a polypropylene glycol component at least partially soluble, emulsifiable, and/or dispersible in water;
- (d) a water-soluble or water-dispersible gas processing agent;
- and
- (e) water.
A low-foaming gas processing composition consisting essentially of:
- (a) a silicone antifoam component comprising a base silicone fluid and particulate silica, the particulate silica in an amount of up to about ten percent by weight of the silicone antifoam component;
- (b) one or a combination of polydimethylsiloxane-polyoxyalkylene co-polymers;
- (c) a polypropylene glycol component at least partially soluble, emulsifiable, and/or dispersible in water in a polypropylene glycol to silicone antifoam component weight ratio range of approximately 1:10 to 10:1;
- (d) a gas sweetening amine;
- and
- (e) water.
A method for processing a gas, the method comprising treating the gas with a composition comprising:
- (a) a silicone antifoam component comprising a base silicone fluid and a particulate metal oxide, wherein the silicone antifoam component further comprises (i) one or more branched silicone resins selected from the group consisting of MQ, MDQ, and T silicone resins;
- and (ii) one or more catalysts capable of promoting condensation reactions between siloxy groups;
- wherein M represents monovalent groups of formula (CH3)3SiO1/2, D represents divalent groups of formula (CH3)2SiO2/2, T represents trivalent groups of formula (CH3)SiO3/2, and Q represents tetravalent groups of formula SiO4/2;
- (b) an emulsifying component in an amount suitable for the at least substantial emulsification of the silicone antifoam component in water;
- (c) a polypropylene glycol component at least partially soluble, emulsifiable, and/or dispersible in water;
- (d) a water-soluble or water-dispersible gas processing agent;
- and
- (e) water.
A method for lowering or substantially removing an amount of base-reactive impurities from a gas, the method comprising treating the gas with a composition comprising:
- (a) a silicone antifoam component comprising a base silicone fluid and particulate silica, the particulate silica in an amount of up to about ten percent by weight of silicone antifoam component, wherein the silicone antifoam component further comprises (i) one or more branched silicone resins selected from the group consisting of MQ, MDQ, and T silicone resins;
- and (ii) one or more catalysts capable of promoting condensation reactions between siloxy groups;
- wherein M represents monovalent groups of formula (CH3)3SiO1/2, D represents divalent groups of formula (CH3)2SiO2/2, T represents trivalent groups of formula (CH3)SiO1/2, and Q represents tetravalent groups of formula SiO4/2;
- (b) one or a combination of polydimethylsiloxane-polyoxyalkylene co-polymers;
- (c) a polypropylene glycol component at least partially soluble, emulsifiable, and/or dispersible in water in a polypropylene glycol to silicone antifoam component weight ratio range of approximately 1:10 to 10:1;
- (d) a gas sweetening amine;
- and
- (e) water.
A method for lowering or substantially removing an amount of one or more base-reactive impurities from a gas, the method comprising treating the gas with a composition prepared by:
- (a) providing an antifoam composition comprising
- (i) a silicone antifoam component comprising a base silicone fluid and a particulate metal oxide, wherein the silicone antifoam component further comprises (i) one or more branched silicone resins selected from the group consisting of MQ, MDQ, and T silicone resins;
- and (ii) one or more catalysts capable of promoting condensation reactions between siloxy groups;
- wherein M represents monovalent groups of formula (CH3)3SiO1/2, D represents divalent groups of formula (CH3)2SiO2/2, T represents trivalent groups of formula (CH3)SiO3/2, and Q represents tetravalent groups of formula SiO4/2;
- (ii) an emulsifying component in an amount suitable for the at least substantial emulsification of the silicone antifoam component in water;
- (iii) a polypropylene glycol component at least partially soluble, emulsifiable and/or dispersible in water;
- (iv) water;
- (b) providing an aqueous amine solution comprising one or more alkanolamines, alkylamines, or combination thereof, in aqueous solution;
- and
- (c) mixing the antifoam composition with the aqueous amine solution to provide a mixture having the antifoam composition in a minimum amount of approximately 1 ppm to a maximum of about approximately 2000 ppm by weight of the silicone and polypropylene glycol combination or by weight of the mixture.
Dependencies are inferred from the claim text.