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US 4,537,701 AGranted
Demulsifiers for breaking crude-oil emulsions and their use
AssigneeBASF SE
InventorsKnut Oppenlaender, Rolf Fikentscher, Egon Buettner, Wilhelmus Slotman, Erich Schwartz, Rudolf Mohr
Life of this patent
Estimating the term…
Abstract
Petroleum demulsifiers which contain, as the active ingredients, oxyalkylated isoalkylphenol-formaldehyde resins and oxyalkylated polyalkylenepolyamines.
Claims8
A petroleum demulsifier which contains, as the active ingredients:
- (A) from 25 to 75 percent by weight, based on the total active ingredients, of an oxyethylation product or a mixed oxyethylation-oxypropylation product of an isoalkylphenol-formaldehyde resin which contains per molecule from 3 to 30 benzene nuclei each carrying an oxyalkylate group comprising from 4 to 50 alkylene oxide units and, in the p-position to the oxyalkylate group, an isoalkyl radical of 8 to 12 carbon atoms, and
- (B) from 75 to 25 percent by weight, based on the total active ingredients, of one or more polyalkylenepolyamines having at least 50 and up to 3,000 recurring ethylene imine or propylene imine units per molecule and in which each nitrogen is completely oxyalkylated with from 10 to 200 alkylene oxide units.
A process for breaking crude oil emulsions, in which from 1 to 1,000 ppm, based on the weight of the emulsion to be broken, of a petroleum demulsifier is added to the emulsions, at from 20.degree. to 80.degree. C., which demulsifier contains, as the active ingredients,
- (A) from 25 to 75 percent by weight, based on the total active ingredients, of an oxyethylation product or a mixed oxyethylation-oxypropylation product of an isoalkylphenol-formaldehyde resin which contains per molecule from 3 to 30 benzene nuclei each carrying an oxyalkylate group comprising from 4 to 50 alkylene oxide units and, in the p-position to the oxyalkylate group, an isoalkyl radical of 8 to 12 carbon atoms, and
- (B) from 75 to 25 percent by weight, based on the total active ingredients, of one or more polyalkylenepolyamines having at least 50 and up to 3,000 recurring ethylene imine or propylene imine units per molecule and in which each nitrogen is completely oxyalkylated with from 10 to 200 alkylene oxide units.
Dependencies are inferred from the claim text.