Distillation: processes – separatory – Convective distillation with normally gaseous medium – e.g. – air
Patent
1996-01-19
1998-03-17
Hruskoci, Peter A.
Distillation: processes, separatory
Convective distillation with normally gaseous medium, e.g., air
202189, 202236, 159 133, 159 286, 159 49, B01D 334
Patent
active
057282730
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention primarily relates to a method for bringing a gas and a liquid into contact with one another, the liquid being passed in the form of a film over an evaporator surface provided with small openings and the gas being fed through the openings in the evaporator surface, which gas mixes with the liquid on said surface and absorbs vapour from said liquid.
BACKGROUND OF THE INVENTION
A method of this type is disclosed in FR-A-2298359. With this method evaporation of the liquid takes place. Compared with conventional vacuum evaporators, with which a medium to be heated is brought into heat exchange with a medium flowing through tubes and reduced pressure is created in the chamber in which the medium to be heated is located, the advantages achieved with the aid of the method according to the above-mentioned French Patent Application are that the installation is lighter in weight, that there is less maintenance, that no expensive control equipment susceptible to malfunctioning is required, that highly trained personnel are not needed to keep the installation in operation, that the yield is high in relation to the price, the weight and the capacity of the installation and that the temperature of the hot medium has to be only slightly above the heating temperature in order to achieve an adequate yield. In fact, use can be made of isentropic low-value energy, which is readily available.
The aim of the present invention is to supplement the above-mentioned known method in such a way that said method can be used for desilting, purification and distillation of liquid.
SUMMARY OF THE INVENTION
According to the invention, the method mentioned in the preamble is, to this end, characterized in that a liquid is subsequently passed in the form of a film over a condenser surface provided with small openings and in that the gas which has absorbed vapours from the liquid film on the evaporator surface is fed through the openings in the condenser surface, at least some of the absorbed vapour condensing and being carried along with the liquid film on the condenser surface and removed.
Preferably, the gas to be fed through the openings in the evaporator surface is at a lower temperature than the liquid on the evaporator surface and the liquid which flows off the evaporator surface is heated and returned to the evaporator surface.
As a consequence of the sloping position of the evaporator and condenser surfaces, a continuously flowing liquid film can be obtained with the use of minimum means.
The gas to be fed through the openings in the condenser surface will be at a higher temperature than the liquid film on the condenser surface. Furthermore, the liquid which flows off the condenser surface will preferably be at least partially cooled and returned to the condenser surface.
A portion of the liquid which flows off the condenser surface can be removed as product.
The invention also relates to an installation for bringing a gas and a liquid into contact with one another, comprising at least one evaporator surface provided with small openings, means for feeding liquid to one side of the evaporator surface and means for removing liquid at the opposing side of the evaporator surface and means for blowing gas through the openings in the evaporator surface. An installation of this type is disclosed in the above-mentioned FR-A-2298359.
According to the invention this installation is characterised in that the installation comprises at least one condenser surface provided with small openings and means for feeding a liquid to one side of said condenser surface and means for removing liquid at the opposing side and means for passing gas which has flowed through the openings in the evaporator surface through the openings in the condenser surface.
Preferably, there are means for heating liquid to be fed over the evaporator surface, means for blowing gas through the openings in the evaporator surface, means for cooling liquid to be passed over the condenser surface and means for returning the gas which has
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patent: 4731159 (1988-03-01), Porter et al.
patent: 5096543 (1992-03-01), Elmore
patent: 5195578 (1993-03-01), Le Goff et al.
patent: 5417805 (1995-05-01), Rosenblad
patent: 5453165 (1995-09-01), Bachman
Green Theodore M.
Hruskoci Peter A.
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