C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/259
C10G 73/02 (2006.01) B01D 33/09 (2006.01)
Patent
CA 1112594
Abstract of the Disclosure A method and a filter are disclosed for removing all solid particles suspended in a slurry, as for dewaxing of various waxy oil-solvent slurries. In particular, in an Oliver type filter where a vacuum on a submerged rotating filter surface in a vat of waxy oil-solvent slurry, for example, builds up a progressively thicker cake of wax, some micro wax crystals pass through the thin portion of the wax cake and in a first sector filter prior to build-up of a wax cake thick enough to become im- pervious to wax crystals in an adjacent second sector, resulting in an initial filtrate containing a minute amount of micro wax crystals for dilution with the rest of the wax crystal free filtrate. The invention comprises a filter wherein a passage is provided for passing the filtrate from the first sector in the filter to a sampler for determining the exist- ence of solid particles, as wax, suspended in the slurry. A first valve is responsive to the sampler, when no solid particles are detected, for mixing the first sector filtrate with the solid particle-free filtrate, and a second valve is responsive to the sampler, when solid particles are detected, for recycling the first sector filtrate to the vat of slurries. The disclosed filter thus increases filter rates, insures longer life of the filter material, and prevents the formation of a flocculent precipitate in the final dewaxed oil.
254746
Bodemuller Robert Jr.
Moyer William C.
Taylor Harold R. III
Smart & Biggar
Texaco Development Corporation
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