Concentrating evaporators – Multiple effects
Patent
1984-03-07
1986-08-26
Bashore, S. Leon
Concentrating evaporators
Multiple effects
159 402, 159 161, 159 473, 202174, 202185R, B01D 114, B01D 126
Patent
active
046081208
ABSTRACT:
An apparatus for removing light oil from solids. The invention is particularly applicable to the removal of residual light oil from solids obtained in an apparatus where aqueous solids are mixed with a light fluidizing oil and subjected to dehydration by heat evaporation. Aqueous solids are mixed with a low viscosity, relatively volatile, water-immiscible light fluidizing oil in a fluidizing tank to obtain a mixture which will remain fluid and pumpable after removal of essentially its entire water content. The mixture of solids, water and fluidizing oil is subjected to a dehydration step by heat evaporation whereby substantially all of the water and at least part of the light oil are evaporated and subsequently recovered. The light fluidizing oil is then largely separated from the solids in a liquid-solid separating means. The solids carrying residual light fluidizing oil are then brought into direct contact in a deoiler apparatus with a hot, inert gas, referred to herein as "blowing gas." The hot, inert blowing gas effects the removal of the residual light oil from the solids. Light oil vapor removed from these solids is separated from effluent blowing gas by condensation and recovered. Effluent blowing gas, free of light oil vapor, may be recycled. The inert blowing gas may be gaseous products of combustion obtained from, for example, a boiler-furnace. Alternatively, the blowing gas may be an inert gas, other than gaseous combustion products, that is heated in the heating region of a boiler-furnace. In either case, the boiler-furnace may or may not be otherwise associated with the apparatus for the dehydration of aqueous solids mixed with light fluidizing oil.
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Bonanno Anthony J.
Casparian Robert E.
Greenfield Charles
Bashore S. Leon
Cannaday Richard L.
Hanover Research Corporation
Manoharan V.
Smith John F.
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