Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1997-01-22
1998-10-20
Drodge, Joseph W.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210 86, 210 97, 210744, 210800, B01D 1712
Patent
active
058242287
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL DOMAIN
The present invention relates to the technical domain of the separation of phases of various products and more particularly liquids, intervening in all industrial processes and it concerns more particularly the step of separation having to occur from a reservoir or closed reactor containing a biphase system with the presence of interface between at least two products, compounds or media having different densities.
In numerous industrial processes, it is necessary to separate one phase with respect to another and, to that end, one technique consists in employing an immersion tube adapted on the cover or top of the reactor, so as to plunge in the inner volume to allow removal, by suction, of the phase presenting the lowest density.
This technique which effectively makes it possible to withdraw, extract or remove the phase of lowest density is generally satisfactory but its use is limited in a certain number of applications.
When the process of separation takes place in a closed and non-transparent reservoir, the difficulty in implementing the above means consists in being able to assess relatively precisely the plane of separation of the phases, so as to be able to dispose the suction port of the immersion tube just slightly above this plane.
It might be considered that such a plane may be assessed with a sufficient precision from the operational parameters of the industrial process and/or from the quantities of basic products to be treated giving rise to the biphase system.
In practice, this is not the case and the uncertainty concerning the assessment of the plane of separation of the phases blind raises a serious problem when the cost of the method for obtaining and that of the compound having to be extracted should be taken into account.
In fact, the uncertainty may lead to leaving as a precaution a large proportion of the phase to be removed inside the reactor, or to removing a part of the phase of higher density, which leads to a pollution of the extraction lines, but also of the phase of lowest density of which it was desired to produce and remove the most pure possible quantity.
These drawbacks are increased further when the level of the plane of separation of the phases is subjected to unforeseeable fluctuations which are difficult to control, due for example either to the conditions of development of a process upstream of the reactor or to the variations in the parameters governing the inner medium of the reactor, such as those of temperature and pressure.
PRIOR ART
It may be considered that the prior art does not provide, at the present time, technical means ensuring removal, within a closed reactor, of a compound of lower density with respect to a medium of higher density, supplying blind a certainty of maximum extraction of the compound of lowest density without any removal of the medium of highest density.
The object of the invention is to respond to the need thus manifested, by proposing a novel method of removal wherein, in a blind volume, the plane of the level of separation between at least two phases, of which only the upper one must be removed from the closed reactor, is taken into account.
DESCRIPTION OF THE INVENTION
To attain the object set forth hereinabove, the invention proposes a method of removal, characterized in that it consists in: of interface between two phases of different density, of the medium of highest density, rectilinear path parallel to the axis of the tube until said interface is detected by the detector, deenergized.
The invention also has for its object a removal device enabling the above object to be attained, such a device for removal within a closed phase separation reactor, of the type comprising a suction head adapted on the top of the reactor and connected to suction means and an immersion tube descending in the reactor and presenting at its lower end a suction port, being characterized in that it comprises: a distance from the plane of the suction port and connected to a data-processing means located outside the reactor, reciprocal re
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Bailloud Maurice
Bolomier Denis
Dubost Pascal
Drodge Joseph W.
Rhone-Poulenc Chimie
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