DEMULSIFIERS FOR CRUDE OIL EMULSIONS

摘要

Complex polyesters based on polycarboxylic acids and polyalcohols derivable by reaction of: 1. A process for demulsification of a water-in-oil emulsion, especially a crude oil emulsion, wherein there is used a reaction product derivable by reaction of, 1. a carboxylic acid component comprising, (a) a poly-carboxylic acid having 2 to 30 carbon atoms and 2 to 5 carboxylic acid groups, and, if desired, (b) a C1-24 monocarboxylic acid with, 2. an alcohol component comprising (a) (i) a polyhydric alcohol comprising 1 to 10 glycol units each having 2 to 4 carbon atoms and each glycol having 2 or 3 hydroxy groups, or, (ii) a sugar or polysaccharide, and, if desired, (b) a C1-C24 monohydric alcohol are efficient as demulsifiers for oil and water emulsions. The polycarboxylic acid may be, for example, citric acid and the polyhydric alcohol may be, for example, di-propylene glycol, tri-ethylene glycol or tri-propylene glycol, or a sugar or polysaccharide.