Liquid purification or separation – Gravitational separator – Material supply distributor
Patent
1988-10-24
1990-11-20
Jones, W. Gary
Liquid purification or separation
Gravitational separator
Material supply distributor
210521, 210522, 210534, C02F 140
Patent
active
049716921
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to apparatus for separating immiscible liquids of various density, and more particularly concerns a settler for liquid-liquid extractors.
In devices of this type separation of a mixture of phases is done in separation sections immersed in one of the phases.
2. Description of the Prior Art
An increase in the output volume of process solutions necessitates the provision of extraction apparatus having a higher efficiency and smaller mounting area, that is, a higher output capacity per unit volume of the settler.
During the separation of a mixture of phases the efficiency of the process grows as the initial volume of the mixture of phases is separated into layers. The efficiency of separation tends to be higher with the reduction in the height of the layer of the mixture of phases. However, separation in thin layers creates the problem of selecting the optimum ratio between the height of the layer of clean phases and the layer of mixture of phases in the separation section, as well as problems associated with uniform distribution of the mixture of phases in sections and transporting the phases being evacuated from the sections to a common phase boundary.
There is known a settler for liquid-liquid extractors (cf., U.S. Pat. No. 3,868,335) comprising a housing having means for feeding a mixture of phases and evacuating the separated clean phases from the housing. The interior of the housing accommodates separation sections in the form of box-shaped means arranged one above another with a longitudinal and lateral offset, and immersed in one of the phases. Each such box-shaped means has an open top and closed bottom when immersed in the light phase, or a closed top and open bottom when immersed in the heavy phase. It also has four vertical side walls, one of which is provided with a means for feeding a mixture of phases. Arranged in front of this wall is the means for evacuation of one of the phases, whereas provided between this means for evacuation and the wall having the means for feeding the mixture of phases is a partition mounted with a clearance relative to the base or to the top of the arrangement. The settler has a vertical collector of the mixture of phases with the means for feeding the mixture of phases connected to the side wall thereof.
However, this settler suffers from low throughput capacity because the box-shaped means are vertically spaced inside the chamber, and offset longitidinally and laterally, resulting in inefficient utilization of the volume of the settler and, therefore, excessive mounting area. The countercurrent movement of the liquid phase, heavy phase and a mixture of both outside the box-shaped means caused by structural peculiarities of the arrangement for feeding the mixture of phases to the apparatus and evacuating them therefrom also affects the throughput capacity of the settler and results in a larger mounting area.
There is also known a settler for liquid-liquid extractors (cf., U.S. Pat. No. 3,820,954) comprising a housing having a means for feeding a mixture of phases in the form of trays, and a means for evacuating the separated clean phases. Accommodated inside the housing are separation sections in the form of pan-shaped elements arranged in parallel one above another and defining a slot for evacuating one of the phases. Each such element has an open top and closed bottom or open bottom and closed top, and communicates with the means for feeding the mixture of phases. In each pan-shaped means one wall thereof is inclined toward the outside, whereas provided in front of this wall is a means for evacuating one of the phases, inclined toward the inside of the apparatus. Accommodated between the means for evacuating one of the phases and the wall inclined towards the outside is a partition extending from the adjacent pan-shaped means to the phase being evacuated which defines a clearance with the base or top of this pan-shaped means. The settler has a vertical collector of the mixture of phases, a
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Antonov Vladimir I.
Gostev Grigory G.
Guryanov Alexandr S.
Kalinnikov Vladimir T.
Korpusov Genrikh V.
Jones W. Gary
Upton Christopher
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