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US 5,667,669 AGranted
Methods for inhibiting foam
AssigneeBetzDearborn Inc.
InventorPaul R. Hart
Life of this patent
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Abstract
Methods for inhibiting the carryover of foam in a delayed coker unit processing hydrocarbon liquids are disclosed. A non-silicone defoamer compound is added to the hydrocarbon until the foam height surpasses a predetermined value. A silicone defoamer compound is then added to the hydrocarbon to knock down the foam head and inhibit carryover of the foam.
Claims6
A method for inhibiting the carryover of foam in a delayed coker unit processing a hydrocarbon liquid comprising the steps of:
- adding an effective defoaming amount of a non-silicone defoamer compound to said hydrocarbon liquid;
- measuring the height of said foam in said delayed coker unit;
- comparing said height to a predetermined value wherein said predetermined value represents a height that said foam should not exceed;
- when said height is greater than said predetermined value, stopping the addition of said non-silicone defoamer and adding an effective defoaming amount of a silicone defoamer compound to said hydrocarbon liquid.
1 more element
Dependencies are inferred from the claim text.