Demulsification of bitumen emulsions using salts of poly(tertiar

Details Demulsification of bitumen emulsions using salts of poly(tertiar Demulsification of bitumen emulsions using salts of poly(tertiar

1981-12-02

1983-09-06

Novosad, Stephen J.

Wells

Processes

Separating material entering well

166303, 208188, 210708, 252344, E21B 4324, E21B 4340

Patent

active

044023634

ABSTRACT:
A process for recovering bitumen from oil-in-water (O/W) emulsions is disclosed wherein water soluble demulsifiers are used. These demulsifiers are salts of poly(tertiary amino)polyurethanes prepared by the reaction of polyisocyanates with diols containing at least one tertiary amino group which reaction product is then reduced in pH until water solubility is attained. To resolve the bituminous petroleum emulsions, the process is carried out between 25.degree. and 160.degree. C. wherein the demulsifier of the invention is contacted with the bituminous emulsion.

REFERENCES:
patent: 2288857 (1942-07-01), Subkow
patent: 3108059 (1963-10-01), Greenwald
patent: 3267998 (1966-08-01), Simpson
patent: 3594393 (1971-07-01), Buriks et al.
patent: 4101172 (1978-07-01), Rabbitts
patent: 4321148 (1982-03-01), McCoy et al.

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