Reduction of aldehydes in amine catalysts
AssigneeHuntsman Petrochemical Corporation
InventorsErnest L. Rister, Jr., Haibo Zhao, Robert A. Grigsby, Jr., Robert B. Moore
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Abstract
The present disclosure provides a method for reducing the aldehyde content in an amine catalyst by treating the amine catalyst with a treating agent selected from a non-cyclic amide substituted with an isocyanate reactive group, a guanidine substituted with an isocyanate reactive group, a polyether amine adducted with a urea compound or a guanidine compound, a free radical scavenger and a mixture thereof. The treated amine catalyst may then be used in the production of polyurethane materials which exhibit reduced aldehyde emissions.
Claims7
A method for reducing the aldehyde content in an amine catalyst comprising (i) mixing an amine catalyst containing one or more aldehyde impurities and a treating agent selected from a polyether amine adducted with a urea compound or a guanidine compound to form a catalyst mixture and (ii) subjecting the catalyst mixture to conditions such that the level of aldehyde impurities in the catalyst mixture are reduced, wherein the polyether amine adducted with a urea compound or a guanidine compound is represented by the general formula (III):
- R4—NH-A-NH2 (III)
- where R4 is a linear or branched alkoxylated polyether polyamine, and
- A is C═O or C═NH.
A method, for reducing the aldehyde content in an amine catalyst comprising (i) mixing an amine catalyst containing one or more aldehyde impurities and a treating agent selected from a polyether amine adducted with a urea compound or a guanidine compound to form a catalyst mixture and (ii) subjecting the catalyst mixture to conditions such that the level of aldehyde impurities in the catalyst mixture are reduced, wherein the polyether amine adducted with a urea compound or a guanidine compound is represented by the general formula (III):
- R4—NH-A-NH2 (III)
- where R4 is a linear or branched alkoxylated polyether polyamine, and
- A is C═O or C═NH and wherein the conditions include maintaining the catalyst mixture at a temperature of between about 60°−150° C. for at least about 3 hours.
Dependencies are inferred from the claim text.