Method and apparatus for centrifugal separation of dispersed pha

Details Method and apparatus for centrifugal separation of dispersed pha Method and apparatus for centrifugal separation of dispersed pha

1985-04-11

1986-12-16

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204186, 204302, B03C 500, B04B 510

Patent

active

046295461

ABSTRACT:
In solvent de-waxing of lube oil, a stream (3) of chilled waxy oil and solvent is introduced into a centrifugal separation device (2) which separates a quantity of wax from the waxy oil and solvent. The dewaxed oil (DWO) and solvent leaving the centrifuge (2) contains a small proportion of wax fines. By introducing free excess charge which is net unipolar into the stream (3), for example by injecting the charge into a stream (9) of cold solvent introduced into stream (3), enhanced deposit of wax on the centrifuge bowl is achieved, thereby substantially removing the wax fines from the dewaxed oil (DWO) and solvent. Alternatively, a bead separator (22), itself employing charge injection with a charge injection (26) for enhanced wax separation, is used for substantially removing the wax fines in the dewaxed oil and solvent from the centrifugal separation device (2). Preferably, both introduction of free excess charge into the stream (3) admitted to the centrifugal separation device (2) and a bead separator (22) are employed, which can lead to higher throughput in the equipment with minimal wax content of the dewaxed oil and solvent leaving the bead separator.

REFERENCES:
patent: 3412002 (1968-11-01), Hubby
patent: 3489669 (1970-01-01), Ruhnke
patent: 3567619 (1971-03-01), Brown
patent: 3616460 (1971-10-01), Watson
patent: 4193774 (1980-03-01), Pilot
patent: 4435261 (1984-03-01), Mintz et al.

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