Abstract:
An improved method of separating bitumen from bitumen coated tar sand comprising the steps of forming a tar sand froth by contacting and agitating the coated particles with a hot liquid, separating the particles of the froth from the bitumen by centrifuging the forth in a disc recycling type of centrifuge apparatus which provides a relatively light overflow effluent and a relatively heavier underflow effluent where the underflow effluent of the centrifuge is fed back to an input of the centrifuge to a return flow path. A liquid wetting transfer agent is combined with the underflow effluent in the return flow path to provide a greatly enhanced separating characteristic. An improved disc recycling type of centrifuge apparatus includes means for converting the flow direction of the recycled underflow and causing the recycled underflow to self impact.
Abstract:
A novel and inexpensive floating roof for tank and pit storage of crude oil and other petroleum products is formed in place by gelling a thin surface layer of oil using gelling agents in low concentration. The gelling agent employed is the reaction product of a diisocyanate and either an amine or an alcohol, which reaction product is a urea-type molecule which ultimately forms the gel with the oil. The layer of gelled oil floats on the surface of the material being stored and follows changes in its level. In sloping-wall pits the gelled layer readily adjusts to the changing wall contours while at the same time substantially reducing volatile and wind entrainment losses, fire hazards and water entrapment.
Abstract:
The instant disclosure is directed to a method for solidifying marine tanker hydrocarbon cargoes to prevent the escape of the hydrocarbon from damaged compartments. The formation of suitable gels contain the hydrocarbon and thus avoid pollution of the sea and nearby shores. Gelling agents are disclosed which permit gellation to occur at a controlled rate, making them particularly suitable for use aboard tankers.