Demulsification of water-in-oil emulsions
AssigneeOndeo Nalco Company
InventorGrahame N. Taylor
Life of this patent
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Abstract
Water-in-Oil emulsions are demulsified using adducts of a) polyalkylene glycols (PAGS) having a molecular weight greater than 6,500 and up to 60,000, ethylene oxide (EO), and diisocyanates (DIs) or b) polyalkylene glycols (PAGs) having a molecular weight greater than 6,500 and up to 60,000 and diisocyanates (DIs). The preferred PAG is polypropylene glycol and the preferred DIs are meta or para tetramethylxylene diisocyanate and toluene diisocyanate.
Claims24
A method of demulsifying water-in-oil emulsions wherein an effective amount of a demulsifying agent is introduced into the emulsion to separate the emulsion into a water phase and an oil phase, said agent being the reaction product of:
- (a) diisocyanate;
- and
- (b) a compound selected from the group consisting of
- (i) a polyalkylene glycol having a molecular weight ranging from about 11,716 to about 60,000 and wherein the alkylene group consists of from 3 to 4 carbon atoms and;
- (ii) an adduct of ethylene oxide and a polyalkylene glycol having a molecular weight ranging from about 11,716 to about 60,000 and wherein the alkylene group consists of from 3 to 4 atoms.
A demulsifying agent for demulsifying water-in-oil emulsions comprising the reaction product of:
- (a) disocyanate;
- and
- (b) a compound selected from the group consisting of:
- (i) a polyalkylene glycol having a molecular weight ranging from about 11,716 to about 60,000 and wherein the alkylene group consists of from 3 to 4 carbon atoms and;
- (ii) an adduct of ethylene oxide and a polyalkylene glycol having a molecular weight ranging from about 11,716 to about 60,000 and wherein the alkylene group consists of from 3 to 4 atoms.
A method of demulsifying water-in-oil emulsions wherein an effective amount of a demulsifying agent is introduced into the emulsion to separate the emulsion into a water phase and an oil phase, said agent being the reaction product having the following formula:
- where n is an integer ranging from 120 to 1,000, and
- where is an integer ranging from 1 to 20.
A method of demulsifying water-in-oil emulsions wherein an effective amount of a demulsifying agent is introduced into the emulsion to separate the emulsion into a water phase and an oil phase, said agent being the reaction product having the following formula:
- where n is an integer ranging from 120 to 1,000, and
- where is an integer ranging from 1 to 20.
A demulsifying agent for demulsifying water-in-oil emulsions comprising the reaction product having the following formula:
- where n is an integer ranging from 120 to 1,000, and
- where is an integer ranging from 1 to 20.
A demulsifying agent for demulsifying water-in-oil emulsions comprising the reaction product having the following formula:
- where n is an integer ranging from 120 to 1,000, and
- where is an integer ranging from 1 to 20.
Dependencies are inferred from the claim text.