Separating liquids

Details Separating liquids Separating liquids

1989-12-15

1991-02-26

Hart, Charles

Liquid purification or separation

Processes

Separating

55345, 209211, 2105122, B01D 2126

Patent

active

049959891

DESCRIPTION:

BRIEF SUMMARY
This invention relates to separating liquids.
This invention is based on the observation that, if a liquid mixture such as an oil water-mixture is subjected to centrifugal action, the mixture is conditioned in a fashion which facilitates subsequent separation of components of the mixture.
The invention provides, in one aspect, a method of separating components of a liquid mixture comprising passing the mixture to a cyclonic device from which the components of the mixture are taken via one outlet and then together passed to a separating device from which the separated components are separately taken.
The invention also provides separating apparatus for separating components of a liquid mixture and comprising a cyclonic device and a separating device, the cyclonic device having an inlet for inlet of the mixture, a chamber in which, in use, the admitted mixture is subjected to centrifugal action and an outlet from which the components of the mixture are in use together taken; the separating device having a separating chamber, with an inlet coupled to in use receive the components from the outlet of the cyclonic device for admission to the separating chamber, and separate outlets from the separating chamber for respective outlet therefrom of the separated liquid components.
The separating device may be a conventional separator, such as a cyclonic device or a settling chamber. By the term "cyclonic device" is meant any device effective to subject the mixture to centrifugal action.
Suitable cyclonic devices comprise devices like cyclonic device as used for separating liquid components in a mixture thereof one from the other, but where no necessary provision is made for bringing out from the separator the separate components. For example suitable devices are described in Australian patent specifications 559,530, 521,482, 77610/87, 38866/85, 40909/85, 12241/83, and PCT/AU87/00402 where no provision is made for take off of liquid from the overflow outlet, liquid being taken from the underflow outlet of the cyclonic device for admission to the separating device. The disclosures of these specifications are hereby incorporated into the present specification to form part thereof.
The separating device may comprise a cyclonic device as described in these prior patent specifications.
The cyclonic device and also the cyclone separator may have one or more inlets arranged for inlet of the mixture with a tangential component of motion to the chamber thereof.
In yet another aspect, the invention comprises an axially extending cyclonic device having an elongate chamber having at least one inlet at one closed end thereof and an axial outlet at the other end, the or each inlet being arranged for inflow of a liquid mixture into the chamber with a tangential component of motion whereby to cause the mixture to be subjected to centrifugal action and thence to be directed to emerge from the chamber via said outlet, and wherein ##EQU1## where d.sub.i and A.sub.i are as hereinafter defined.
The invention is further described by way of example only with reference to the accompanying drawings in which:
FIG. 1 is a diagram of an apparatus constructed in accordance with the invention;
FIG. 2 is a diagram of a cyclonic device constructed in accordance with the invention;
FIG. 3 is an axial cross-section of a modified form of a cyclonic device constructed in accordance with the invention;
FIGS. 4 and 5 are respective cross-sectional diagrams of two further cyclonic devices constructed in accordance with the invention; and
FIG. 6 is a graph illustrating separating efficiency of an apparatus constructed in accordance with the invention.
Referring firstly to FIG. 1, the apparatus 100 shown therein comprises a cyclonic device 110 having an inlet 112 to an axially extending chamber 114 and an outlet 115 from the chamber 114. The chamber 114 may be formed in known fashion such as in a similar form to the separating chambers of cyclone separators described in the aforementioned prior patent specifications. In particular, the chamber 114 may be of

REFERENCES:
patent: 4601734 (1986-07-01), Meier et al.
patent: 4764287 (1988-08-01), Colman et al.

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