Liquid purification or separation – Processes – Separating
Patent
1981-09-03
1983-09-27
Spear, Jr., Frank A.
Liquid purification or separation
Processes
Separating
134 10, 134 12, 210259, 210804, B01D 2102, B08B 310
Patent
active
044067968
ABSTRACT:
A mixture of oil, mostly finely divided solids, and water (a typical example would be steel rolling mill scale mixture) is one of the feed materials for this process. Most of the water is first drawn off. Then the material is fed through a plurality of mixers, and after each mixer the entire composition is passed through a separator, herein described as a dewetting apparatus, which separates the fine solids from the oil and solvent and returns the expended solvent upstream toward the feed point. The diminished volume of material then passes through a final dewetting screen where the solids are washed by a small stream of fresh solvent and the fine solids then pass through a dryer. All expended solvent is collected and passed through a fractionating still which separates the recovered oil, for storage, and the solvent vapors pass through a condenser to a regenerated solvent storage tank. All of the expended solvent is saved and used over repeatedly.
REFERENCES:
patent: 3544369 (1970-12-01), Keogh, Jr.
patent: 3844943 (1974-10-01), Duval
patent: 3865629 (1975-02-01), Dankoff et al.
patent: 4029517 (1977-06-01), Rand
patent: 4091826 (1978-05-01), Bahrke
patent: 4288329 (1981-09-01), Duval
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