Alkyl substituted phenol-polyethylenepolyamine-formaldehyde resins as asphaltene dispersants
AssigneeNalco Chemical Company
InventorsMaria B. Manek, Kailash N. Sawhney
Life of this patent
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Abstract
Asphaltenes may be dispersed in caustic treated petroleum crude oil, or in any fraction thereof by adding an effective dispersing amount of a mono or di substituted alkylphenol-formaldehyde resin and or a monosubstituted alkylphenol-polyethylenepolyamine-formaldehyde resin, such resins having a weight average molecular weight of from about 1,000 to about 20,000, and an alkyl substituent containing from about 4 to about 24 carbon atoms, which alkyl substituent may be linear or branched.
Claims4
A method of dispersing asphaltenes in caustic treated petroleum, crude oil or in any fi-action thereof which comprises adding an effective dispersing amount of an asphaltene dispersant to said caustic treated petroleum, crude oil, or fraction thereof, the dispersant comprising a monosubstituted alkylphenol-polyethylenepolyamine-formaldehyde resin having been prepared by the base catalyzed reaction of:
- a. a monosubstituted alkylphenol having an alkyl substituent containing from about 4 to 24 carbon atoms, which alkyl substituent may be a linear or branched alkyl group;
- b. a polyethylene polyamine represented by the formula:
- H.sub.2 N--(CH.sub.2 --CH.sub.2 --NH--).sub.n H
- where n is an integer of from 1 to 5;
- and,
- c. formaldehyde,
- in a mole ratio of alkylphenol to polyethylenepolyamine of from 5:1 to 3:1, and a mole ratio of alkylphenol to formaldehyde of from about 2:1 to 1:2, said resin having a weight average molecular weight of from about 1,000 to about 20,000.
Dependencies are inferred from the claim text.