Distillation: apparatus – Apparatus – Systems
Patent
1986-01-29
1988-01-12
Bashore, S. Leon
Distillation: apparatus
Apparatus
Systems
202186, 202235, 202237, 159DIG27, 159DIG28, 159DIG32, 203 10, 203DIG9, 203DIG17, B01D 304
Patent
active
047189851
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a system for diaphragm distillation.
Systems for diaphragm distillation are previously known, for example for sea water desalination. One such system is known from SE-PS No. 8002233-8.
In this patent a system is described to comprise a diaphragm, the properties of which are such that vapor is permitted to pass through the diaphragm while liquid cannot pass therethrough. In parallel with the diaphragm a condensation surface is located and, furthermore, heat exchangers are provided, the object of which is to maintain the liquid to be distilled warm and to maintain the condensation surface cooled by a colder liquid flowing past.
The present invention has the object to combine in one and the same system diaphragm distillation and the heat exchange required for the distillation process.
The invention implies that a simple and compact unit is obtained, which can be coupled together with additional units, each of which comprises diaphragm, condensation surface and heat exchanging surfaces.
The present invention, thus, relates to a system for diaphragm distillation of a liquid, such as for desalinating sea water, comprising a diaphragm, through which vapor but not liquid is permitted to pass, and a condensation surface for condensing vapour having passed through the diaphragm, and necessary passageways. The invention is characterized in that the system comprises one or more units, each of which comprises a plurality of pipes located one within the other, viz. a first inner pipe, a second pipe located outside thereof and consisting of a diaphragm of the afore-mentioned kind, and a third pipe located outside the second pipe, the said first and the said third pipe being of a gas-tight material, that the said unit is surrounded by a fourth gas-tight pipe, and a first passageway is formed by said first pipe, and a second, a third and a fourth passageway are formed between said pipes in successive order in the outward from inside direction, and that said passageways in radial order are intended to transport a hot medium for heat supply, to transport the liquid to be distilled to condensate gas having passed through the diaphragm and to transport distillate having been condensed, which condensation of the gas takes place against a condensation surface, which consists of the passagway surface opposite to the diaphragm, and, respectively, to transport a cold medium for conducting away heat.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in the following in greater detail, with reference to an embodiment thereof shown in the accompanying drawing where FIG. 1 is a section through a unit assembled of several pipes, FIG. 2 shows schematically a system comprising several units, seen by way of a horizontal section A--A marked in FIG. 3, and FIG. 3 shows the system shown in FIG. 2, seen by way of a sectional view B--B marked in FIG. 2.
Diaphragm distillation is a method of effecting distillation at a relatively low temperature without overpressure or vacuum. In diaphragm distillation a difference in temperature is maintained between the liquid to be distilled and the surface, against which condensation of gas having passed through the diaphragm takes place. Heat, therefore, is supplied to the liquid to be distilled, and heat is removed from the condensation surface.
FIG. 1 is a schematic view of a section through a unit according to the invention assembled of several pipes. In FIG. 1 only a part of the unit length is shown. One or several such units can be utilized together.
Each unit comprises a plurality of pipes located one inside the other, viz. a first inner pipe 1, a second pipe 2 located outside the same, and a third pipe 3 located outside the second pipe 2. The unit is surrounded by a fourth pipe 4. The first pipe 1, the third pipe 3 and the fourth pipe 4 are made of a liquid and gas-tight or impermeable material, for example plastic or metal. The pipes 1,3,4 should be made of a material which has good thermal conduction properties and is corrosion resistant. The second pipe 2 co
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Bashore S. Leon
Manoharan V.
Svenska Utvecklings AB
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