Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1984-01-20
1986-01-14
Castel, Benoit
Liquid purification or separation
With means to add treating material
Directly applied to separator
261124, 55196, C02F 120, B01D 300
Patent
active
045644470
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for purifying liquid contaminated by solvents, particularly water contaminated by solvents of the chlorinated, fluorinated or aromatic hydrocarbon type, such as trichloroethylene and xylene.
TECHNOLOGICAL BACKGROUND
In industry, there is often water contaminated with small amounts of solvent of the mentioned kind. There are no effective and economic aids in the art today, for high-degree purification of such water, the contaminated water therefore often being led off without purification, in contravention to current regulations.
In this connection it has indeed been proposed to purify water burdened with solvent by utilizing so-called strip columns. However, these are expensive and complicated, and it has been found impossible to reduce the solvent concentration to below 5 ppm thereby.
OBJECT OF INVENTION
The object of the present invention is to provide a new apparatus for purification of the kind mentioned in the introduction, which inter alia gives the following substantial improvements and advantages; consequently cheap, so that purification of the kind discussed here can be applied more generally; of purification air, which does not normally need to be heated; simple, in contradistinction to what is the case in conjunction with columns operating vertically and on the counter-flow principle.
SUMMARY OF INVENTION
The above-mentioned object is achieved in accordance with the invention by an apparatus having the distinguishing features disclosed in the appended claims.
The apparatus in accordance with the invention is thus substantially distinguished in that it comprises a container or vessel with an inlet for contaminated liquid at an inlet end and an outlet for purified liquid at an opposing outlet end, the vessel being adapted such that the liquid flows generally horizontally therein; means in conjunction with the outlet for maintaining the liquid flowing through the vessel at a given level, at least over a working section; means arranged in the working section for being flowed over by the liquid at a small depth and for being supplied with cleaning air such as to cause the latter to pass upwards in finely divided form through the liquid flowing past, thus to entrain and remove from the liquid contaminating solvent dissolved therein, said means including a plurality of transversely arranged, localized, air output members separated by liquid pockets and with a large number of air output orifices, which are uniformly distributed over the working section flowed over by the liquid, and which are disposed at a given distance below the liquid level determined by said means at the outlet for maintaining liquid level; and means for leading air away from the vessel, preferably to a carbon filter, said air having been emitted from the air outlet members and having entrained solvent on its passage through the liquid.
In accordance with the invention, an excellent gain is obtained between the liquid and gas phase, by "fresh" air being pressed or evacuated out through a finely and uniformly distributing system of small orifices (with a typical diameter of about 1 mm), this air passing through a comparatively very thin (typical thickness 5-10 mm) layer of water moving past, which is kept within predetermined limits. The air passes out from the orifices in the form of a large number of small bubbles which are uniformly distributed in the liquid flowing past. In this respect it may be advantageous to form or arrange the orifices such that the bubbles have a tendency to whirl round or rotate in the liquid. In accordance with the invention, the liquid is not given the opportunity of flowing quietly and uniformly directly through the vessel, but after passage over an air outlet member it is force-agitated and possibly caused to reside in spaces of the "blind alley" type, whereby an evening-out of the concentration of remaining contaminating solvent is obtained.
To obtain the best purification effect, the liquid level above the orifices, the air quant
REFERENCES:
patent: 1598858 (1926-09-01), Greenwalt
patent: 2005422 (1935-06-01), Hunicke et al.
patent: 2718275 (1955-09-01), Banks
patent: 3450603 (1969-06-01), Meyers et al.
patent: 4076617 (1978-02-01), Bybel et al.
patent: 4415341 (1983-11-01), Echtler
Castel Benoit
VICO Kemisk Tekniska Fabrik AB
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