CA1084832A - Vapor compression liquid treating system - Google Patents
Vapor compression liquid treating systemInfo
- Publication number
- CA1084832A CA1084832A CA275,549A CA275549A CA1084832A CA 1084832 A CA1084832 A CA 1084832A CA 275549 A CA275549 A CA 275549A CA 1084832 A CA1084832 A CA 1084832A
- Authority
- CA
- Canada
- Prior art keywords
- vapor
- chamber
- evaporation
- evaporation chamber
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
APPLICATION OF: RICHARD CHUTE
FOR: VAPOR COMPRESSION LIQUID TREATING SYSTEM
A B S T R A C T
A contaminated liquid containing a solvent is fed onto an evaporation means contained within an evaporation chamber maintained at a reduced pressure. A vapor compression means, comprising in part a centrifugal compressor, draws solvent vapor from the evaporation chamber, compresses the vapor and forces the compressed vapor into a compression chamber. The latent heat given off by vapor condensing in the compression chamber is transferred to the contaminated liquid to evaporate the solvent.
The design of the evaporation chamber can include an archemedian spiral.
FOR: VAPOR COMPRESSION LIQUID TREATING SYSTEM
A B S T R A C T
A contaminated liquid containing a solvent is fed onto an evaporation means contained within an evaporation chamber maintained at a reduced pressure. A vapor compression means, comprising in part a centrifugal compressor, draws solvent vapor from the evaporation chamber, compresses the vapor and forces the compressed vapor into a compression chamber. The latent heat given off by vapor condensing in the compression chamber is transferred to the contaminated liquid to evaporate the solvent.
The design of the evaporation chamber can include an archemedian spiral.
Description
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S P E C I F I C A T I O N
BACKGROUND OF THE INVENTION
. .
l. Field of the Invention In one aspect this invention relates to vacuum ;
distillation systems. In yet another aspect this invention relates to closed loop waste treating systems.
S P E C I F I C A T I O N
BACKGROUND OF THE INVENTION
. .
l. Field of the Invention In one aspect this invention relates to vacuum ;
distillation systems. In yet another aspect this invention relates to closed loop waste treating systems.
2. Prior Art Vapor compression stills for distilling saline water and the like are known in the art. Such devices have a vacuum chamber for evaporation of pure water from the saline solution, means for heating the saline solution to an elevated temperature and a heat exchanger to recycle some of the heat put into the purified water vapor during vapor compression.
Similar vapor distillation apparatus has been used to purify and concentrate plating solutions. The concentrated solution is then recycled. Recycling reduces the waste of raw materials and results in a produc.ion ~1 cycle having essentially zero pollution.
The prior art systems have achieved some success in reducing pollution and recycling plating solutions. -However, even the vapor compression systems have problems which inhibit their use. The prior art systems generally use a rotor or vane type compressor, which has rubbing parts, to maintain a vacuum in the evaporation cha~ber and compress solvent vapor evaporated from the contaminated plating solution. This type of compressor is inef-icient and requires a high degree of maintenance, especially ~;~ .
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when used in a system for concentrating plating fluids. Thus, the system is costly to operate and lacks the desired reli-ability. Maintenance problems can also result in expensive down time while repairs are made to the system.
Prior art compressors also operate at a uniform rate and, therefore, the output solution is a function of the input solution. The resulting treated concentrate can be too strong or too weak for direct recycling to the process requiring further treatment to bring the solution to the proper concentration for recycling.
According to the present invention, there is provided a continuous treatlnent for use in a processing cycle, the system being adapted to treat contaminated rinse water eontaining valuable materials. The system ineludes a vapor compression still having a housing, an evaporation chamber contained within the housing, and a evaporation surface eontained within the housing, a eompressor located at one end of the housing adapted to accelerate the vapor formed in the evaporation chamber and maintain the evaporation ehamber at a reduced pressure, a fixed blade compressor disposed radially about the compressor to reeeive and compress the aeeelerated vapor, and a condensation chamber surrounding the evaporation chamber and being adapted to transfer heat given off by the condensing vapor to the evaporation chamber, and means to feed eontaminated liquid to the evaporation ehamber. Means is provided to withdraw eoncentrated liquid from the evaporation chamber and return it to the processing cyele, and means is provided for withdrawing the purified eondensed vapor from the eondensation ehamber and returning it to a rinse cycle.
A feature of this invention is the provision of a stationary blade diffuser which receives and compresses the vapors accelerated by the centrifugal compressor. The 108~832 stationary blade configuration reduces the volume of the diffuser or volute. The smaller diffuser results in a smaller operating unit which reduces cost and the amount of expensive space consumed in the plant. Also, a stationary blade compressor more efficiently compresses the vapor decreasing the amount of energy which must be added to the system.
A further feature of a specific embodiment of the invention is the provision of an archemedian evaporation surface and heat exchanger which receives a continuous flow of the solution to be concen-trated. The evaporation chamber is cone-shaped with the apex at the bottom. An evaporation surface, mounted a approximately righ angles to the cone's surface, extends in a continuous spiral along the inner -~
surface of the cone. The solution to be concentrated is - fed onto the evaporation surface near the base or supper portion of the cone and will flow slowly downward along the spiral towards the apex at the bottom. The evaporation surface and cone form a trough which holds the solution as it flows towards the apex.
- A heat absorbtion surface extends into the compression chamber which surrounds the cone-shaped evaporation chamber. The heat absorbtion surface absorbs the latent heat of vaporization given off by the condensing -vapor and transfers the heat to the spiral evaporation surface.
As an alternative evaporation surface in a specific embodiment of the invention, the vapor compression chamber can contain several conical evaporation surfaces. In general, the evaporation chamber will have at least 4 of the hollow conical evaporation surfaces disposed within the chamber.
Liquid to be concentrated is sprayed or fed onto the surface
Similar vapor distillation apparatus has been used to purify and concentrate plating solutions. The concentrated solution is then recycled. Recycling reduces the waste of raw materials and results in a produc.ion ~1 cycle having essentially zero pollution.
The prior art systems have achieved some success in reducing pollution and recycling plating solutions. -However, even the vapor compression systems have problems which inhibit their use. The prior art systems generally use a rotor or vane type compressor, which has rubbing parts, to maintain a vacuum in the evaporation cha~ber and compress solvent vapor evaporated from the contaminated plating solution. This type of compressor is inef-icient and requires a high degree of maintenance, especially ~;~ .
cbr/~ ;
,.
- 108~3;i~
when used in a system for concentrating plating fluids. Thus, the system is costly to operate and lacks the desired reli-ability. Maintenance problems can also result in expensive down time while repairs are made to the system.
Prior art compressors also operate at a uniform rate and, therefore, the output solution is a function of the input solution. The resulting treated concentrate can be too strong or too weak for direct recycling to the process requiring further treatment to bring the solution to the proper concentration for recycling.
According to the present invention, there is provided a continuous treatlnent for use in a processing cycle, the system being adapted to treat contaminated rinse water eontaining valuable materials. The system ineludes a vapor compression still having a housing, an evaporation chamber contained within the housing, and a evaporation surface eontained within the housing, a eompressor located at one end of the housing adapted to accelerate the vapor formed in the evaporation chamber and maintain the evaporation ehamber at a reduced pressure, a fixed blade compressor disposed radially about the compressor to reeeive and compress the aeeelerated vapor, and a condensation chamber surrounding the evaporation chamber and being adapted to transfer heat given off by the condensing vapor to the evaporation chamber, and means to feed eontaminated liquid to the evaporation ehamber. Means is provided to withdraw eoncentrated liquid from the evaporation chamber and return it to the processing cyele, and means is provided for withdrawing the purified eondensed vapor from the eondensation ehamber and returning it to a rinse cycle.
A feature of this invention is the provision of a stationary blade diffuser which receives and compresses the vapors accelerated by the centrifugal compressor. The 108~832 stationary blade configuration reduces the volume of the diffuser or volute. The smaller diffuser results in a smaller operating unit which reduces cost and the amount of expensive space consumed in the plant. Also, a stationary blade compressor more efficiently compresses the vapor decreasing the amount of energy which must be added to the system.
A further feature of a specific embodiment of the invention is the provision of an archemedian evaporation surface and heat exchanger which receives a continuous flow of the solution to be concen-trated. The evaporation chamber is cone-shaped with the apex at the bottom. An evaporation surface, mounted a approximately righ angles to the cone's surface, extends in a continuous spiral along the inner -~
surface of the cone. The solution to be concentrated is - fed onto the evaporation surface near the base or supper portion of the cone and will flow slowly downward along the spiral towards the apex at the bottom. The evaporation surface and cone form a trough which holds the solution as it flows towards the apex.
- A heat absorbtion surface extends into the compression chamber which surrounds the cone-shaped evaporation chamber. The heat absorbtion surface absorbs the latent heat of vaporization given off by the condensing -vapor and transfers the heat to the spiral evaporation surface.
As an alternative evaporation surface in a specific embodiment of the invention, the vapor compression chamber can contain several conical evaporation surfaces. In general, the evaporation chamber will have at least 4 of the hollow conical evaporation surfaces disposed within the chamber.
Liquid to be concentrated is sprayed or fed onto the surface
- 3 --- : . : -1~8483Z
of the cones near their apex, the liquid adhering to the surface as it falls towards the bottom of the evaporation chamber. The solvent evaporates from the liquid film and the resulting vapor is drawn into the centrifugal compressor where it is compressed. The compressed gas is forced into the hollow interior of the cone where it condenses on the inner walls of the cone giving off latent heat of vaporization to the cone wall which, in turn, conducts the heat to the liquid being concentrated. The concentrated liquid and condensed pure solvent flow or fall to the bottom of the evaporation chamber into separate chambers from which they can be withdrawn.
This structure provides a large surface area for evaporation in a small compact structure which is easily assembled.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawing:
Fig. 1 is a schematic diagram of a plating line having a vapor compression system associated therewith;
Fig. 2 is a side elevation of a vapor compression system showing an evaporation chamber of this invention;
Fig. 3 is an enlarged sectional view of the evaporation surface of Fig. 2 showing the surface in greater detail;
'" ' .
Fig. 4 is a top view taken along the line 4-4 of Fig. 2 showing the stationary blade diffuser blades used in compressing the gas; and Fig. 5 is a side view in section of an evaporation chamber having a plurality of conical evaporation surfaces.
DETAILED DESCRIPTIO~J OF THE PREFERRED EMBODIMENTS
A typical plating system is shown in Fig. 1.
Parts to be plated are placed in a plating tank 10 which contains a solution of ions to be deposited on the part as a metal layer. After the desired metal layer is deposited, the parts are moved to rinse tanks 11, 12 and 13, where the plating solution adhering to the parts is washed off.
During the plating cycle a substantial amount of plating solution, containing valuable plating ions and rinse water is carried from tank to tank. As shown, water from tank 13 is used to keep tank 12 full and liquid from tank 12 is used to fill tank 11. The water in tank 11 eventually contains large amounts of metal ions and plating additives.
Before pollution control laws such rinse water was generally dumped into the nearest stream or sewer and additional fresh water added to tank 13 as needed. With the increasing cost of metals throwing away the rinse water has become uneconomical.
In the system of this invention, the contaminated rinse water from tank 11 passes through a conduit 16 into a heat exchanger 14 where the contaminated rinse water absorbs heat from purified water which enters the heat exchanger via conduit 18. Pipe 20 carries the preheated rinse water to a vapor compression unit 21.
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The preheated rinse water is subjected to reduced pressure and condensation heat from a vapor compression cycle which concen-trates the rinse water and evaporates pure water. Vaporizing pure water concentrates metal ions in the remaining rinse water to the same concentration as is in the plating tank 10.
The concentrated solution is then returned to the tank by a conduit 22. If desired,the concent~rate can be pumped to a holding tank (not shown) and held until a quantity of concen-trate has been collected. Then the concentrate can be added to the plating bath as a batch.
One vapor compression unit 21 useful in this invention, is shown in greater detail in Figs. 2 and 3, which also show a detailed heat exchanger. The rinse water to be concentrated enters the heat exchanger 14 at the bottom through pipe 16 passing upward and exits at 19. The rinse water passes through pipe 20 into an auxiliary heater 24 which can supply additional heat to help start the vapor compression apparatus when desired.
The contaminated liquid passes through a valve 25 which controls the rate at which contaminated rinse liquid flows onto an archemedian spiral surface 26. The spiral surface 26 projects from the wall at approximately a right angle forming a natural trough which holds the contaminated liquid as it flows down the spiral.
A housing 28 having an inner wall 29 and an outer wall 30 supports the spiral 26. The inner wall 29 and outer wall 30 form a vapour condensation chamber 32 therebetween.
108~832 The housing's inner chamber 36, which forms an evaporation chamber, is maintained at a reduced pressure of about 0.5 to 1.5 psia. The chamber 36 is continuously evacuated by means of a centrifugal compressor 38 mounted atop the housing 29. The compressor 38 draws pure water vapor which has evaporated from the contaminated rinse water out of the chamber 36 through a screen 40. The screen 40 separates any liquid droplets in the vapor allow- -ing only vapors to pass into the compressor 38. Separating the droplets from the vapor protects the centrifugal com-pressor vanes and prevents carryover of the contamination.
As shown, the compressor 38 is driven by an electric motor 41 but other drive means would be acceptable.
The vapor from the contaminated liquid is drawn into the compressor 38 where it is accelerated to a high velocity by the impellers 42 and pushed into a stationary blade compression unit 44 as shown in greater detail in Fig. 4. The stationary blades 45 allow the vapor to slow in velocity which raises the pressure. The compressed gas moves through an annular chamber 46 and into the condensation chamber 32.
In the condensation chamber 32, the vapor con-denses to form a liquid. The latent heat of vaporization given off by the condensing vapor is absorbed by fins 47 which extend into the condensation chamber and the inner wall 29 of the housing. The heat is transferred to the archemedian spiral. The heat evaporates the water from the contaminated water forming more water vapor. The liquid is withdrawn from the chamber 32 at outlet 48 into line 49 which enters a vacuum pump 50. The pump 50 removes air cbr/~
..
- : "
1~8~832 and other entrained gases from the purified water before the water is returned to the rinse tank. The vacuum pump 50 can also be used to reduce the pressure in the evaporation chamber when the vapor compression unit is being started.
The vacuum pump 50 can reduce the pressure in the conden-sation and evaporation chamber to a level which insures evaporation of the rinse water initially fed to the evaporation chamber.
As shown, there is a line 52 which runs from line 54, the purified water, to line 20, carrying contaminated rinse water to the vacuum still 21. A portion of the purified water can be directly recycled via line 52 to maintain the vapor compression apparatus at optimum feed rate. This also allows the concentration output to be varied by varying the concentration of the rinse water entering the evaporation chamber. -Turning to Fig. 5, a second embodiment of a suitable evaporation chamber is shown. Liquid to be con-centrated enters an evaporation chamber 62 contained in ~-housing 60 via a line 63. The liquid is sprayed by nozzles 64 onto a plurality of cones 66 forming a falling thin film of liquid. The cones 66 are hollow and provide a large outer surface area for the evaporation of solvent. The solvent vapor generated on the outer surface of the cones 66 is drawn upward into a centrifugal compressor 68 which increases the velocity of the vapor.
The vapor passes into a volute or diffuser 70 where the gas slows and kinetic energy is changed into pressure energy. The compressed vapor passes down an annular passage 72 which surrounds cbr/
: -the evaporation chamber 66 and into a reservoir area 74at the bottom of the housing 60. The compressed vapor will enter conical condensation compartments 76 inside the cones 66 where the vapor will condense on the sides of the com-partment and drip into the reservoir 74 at the bottom of the housing. As the vapor condenses in the compartment 76, it will from an area of reduced pressure in the compartment which will tend to draw the compressed vapor upward into the compartment. As the compressed vapor condenses in the compartment, it transfers its latent heat of vaporization to the cone wall which in turn transfers the heat to the falling film of liquid to be concentrated.
Various modifications and alterations of the system of this invention will become obvious to those skilled in the art and it is understood that this invention is not limited to the embodiment described hereinbefore.
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- . ; .
of the cones near their apex, the liquid adhering to the surface as it falls towards the bottom of the evaporation chamber. The solvent evaporates from the liquid film and the resulting vapor is drawn into the centrifugal compressor where it is compressed. The compressed gas is forced into the hollow interior of the cone where it condenses on the inner walls of the cone giving off latent heat of vaporization to the cone wall which, in turn, conducts the heat to the liquid being concentrated. The concentrated liquid and condensed pure solvent flow or fall to the bottom of the evaporation chamber into separate chambers from which they can be withdrawn.
This structure provides a large surface area for evaporation in a small compact structure which is easily assembled.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawing:
Fig. 1 is a schematic diagram of a plating line having a vapor compression system associated therewith;
Fig. 2 is a side elevation of a vapor compression system showing an evaporation chamber of this invention;
Fig. 3 is an enlarged sectional view of the evaporation surface of Fig. 2 showing the surface in greater detail;
'" ' .
Fig. 4 is a top view taken along the line 4-4 of Fig. 2 showing the stationary blade diffuser blades used in compressing the gas; and Fig. 5 is a side view in section of an evaporation chamber having a plurality of conical evaporation surfaces.
DETAILED DESCRIPTIO~J OF THE PREFERRED EMBODIMENTS
A typical plating system is shown in Fig. 1.
Parts to be plated are placed in a plating tank 10 which contains a solution of ions to be deposited on the part as a metal layer. After the desired metal layer is deposited, the parts are moved to rinse tanks 11, 12 and 13, where the plating solution adhering to the parts is washed off.
During the plating cycle a substantial amount of plating solution, containing valuable plating ions and rinse water is carried from tank to tank. As shown, water from tank 13 is used to keep tank 12 full and liquid from tank 12 is used to fill tank 11. The water in tank 11 eventually contains large amounts of metal ions and plating additives.
Before pollution control laws such rinse water was generally dumped into the nearest stream or sewer and additional fresh water added to tank 13 as needed. With the increasing cost of metals throwing away the rinse water has become uneconomical.
In the system of this invention, the contaminated rinse water from tank 11 passes through a conduit 16 into a heat exchanger 14 where the contaminated rinse water absorbs heat from purified water which enters the heat exchanger via conduit 18. Pipe 20 carries the preheated rinse water to a vapor compression unit 21.
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i~8483Z
The preheated rinse water is subjected to reduced pressure and condensation heat from a vapor compression cycle which concen-trates the rinse water and evaporates pure water. Vaporizing pure water concentrates metal ions in the remaining rinse water to the same concentration as is in the plating tank 10.
The concentrated solution is then returned to the tank by a conduit 22. If desired,the concent~rate can be pumped to a holding tank (not shown) and held until a quantity of concen-trate has been collected. Then the concentrate can be added to the plating bath as a batch.
One vapor compression unit 21 useful in this invention, is shown in greater detail in Figs. 2 and 3, which also show a detailed heat exchanger. The rinse water to be concentrated enters the heat exchanger 14 at the bottom through pipe 16 passing upward and exits at 19. The rinse water passes through pipe 20 into an auxiliary heater 24 which can supply additional heat to help start the vapor compression apparatus when desired.
The contaminated liquid passes through a valve 25 which controls the rate at which contaminated rinse liquid flows onto an archemedian spiral surface 26. The spiral surface 26 projects from the wall at approximately a right angle forming a natural trough which holds the contaminated liquid as it flows down the spiral.
A housing 28 having an inner wall 29 and an outer wall 30 supports the spiral 26. The inner wall 29 and outer wall 30 form a vapour condensation chamber 32 therebetween.
108~832 The housing's inner chamber 36, which forms an evaporation chamber, is maintained at a reduced pressure of about 0.5 to 1.5 psia. The chamber 36 is continuously evacuated by means of a centrifugal compressor 38 mounted atop the housing 29. The compressor 38 draws pure water vapor which has evaporated from the contaminated rinse water out of the chamber 36 through a screen 40. The screen 40 separates any liquid droplets in the vapor allow- -ing only vapors to pass into the compressor 38. Separating the droplets from the vapor protects the centrifugal com-pressor vanes and prevents carryover of the contamination.
As shown, the compressor 38 is driven by an electric motor 41 but other drive means would be acceptable.
The vapor from the contaminated liquid is drawn into the compressor 38 where it is accelerated to a high velocity by the impellers 42 and pushed into a stationary blade compression unit 44 as shown in greater detail in Fig. 4. The stationary blades 45 allow the vapor to slow in velocity which raises the pressure. The compressed gas moves through an annular chamber 46 and into the condensation chamber 32.
In the condensation chamber 32, the vapor con-denses to form a liquid. The latent heat of vaporization given off by the condensing vapor is absorbed by fins 47 which extend into the condensation chamber and the inner wall 29 of the housing. The heat is transferred to the archemedian spiral. The heat evaporates the water from the contaminated water forming more water vapor. The liquid is withdrawn from the chamber 32 at outlet 48 into line 49 which enters a vacuum pump 50. The pump 50 removes air cbr/~
..
- : "
1~8~832 and other entrained gases from the purified water before the water is returned to the rinse tank. The vacuum pump 50 can also be used to reduce the pressure in the evaporation chamber when the vapor compression unit is being started.
The vacuum pump 50 can reduce the pressure in the conden-sation and evaporation chamber to a level which insures evaporation of the rinse water initially fed to the evaporation chamber.
As shown, there is a line 52 which runs from line 54, the purified water, to line 20, carrying contaminated rinse water to the vacuum still 21. A portion of the purified water can be directly recycled via line 52 to maintain the vapor compression apparatus at optimum feed rate. This also allows the concentration output to be varied by varying the concentration of the rinse water entering the evaporation chamber. -Turning to Fig. 5, a second embodiment of a suitable evaporation chamber is shown. Liquid to be con-centrated enters an evaporation chamber 62 contained in ~-housing 60 via a line 63. The liquid is sprayed by nozzles 64 onto a plurality of cones 66 forming a falling thin film of liquid. The cones 66 are hollow and provide a large outer surface area for the evaporation of solvent. The solvent vapor generated on the outer surface of the cones 66 is drawn upward into a centrifugal compressor 68 which increases the velocity of the vapor.
The vapor passes into a volute or diffuser 70 where the gas slows and kinetic energy is changed into pressure energy. The compressed vapor passes down an annular passage 72 which surrounds cbr/
: -the evaporation chamber 66 and into a reservoir area 74at the bottom of the housing 60. The compressed vapor will enter conical condensation compartments 76 inside the cones 66 where the vapor will condense on the sides of the com-partment and drip into the reservoir 74 at the bottom of the housing. As the vapor condenses in the compartment 76, it will from an area of reduced pressure in the compartment which will tend to draw the compressed vapor upward into the compartment. As the compressed vapor condenses in the compartment, it transfers its latent heat of vaporization to the cone wall which in turn transfers the heat to the falling film of liquid to be concentrated.
Various modifications and alterations of the system of this invention will become obvious to those skilled in the art and it is understood that this invention is not limited to the embodiment described hereinbefore.
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- . ; .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A continuous system for use in a processing cycle, the system being adapted to treat contaminated rinse water containing valuable materials comprising:
a vapor compression still including: a housing;
an evaporation chamber contained within the housing; an evaporation surface contained within said housing; a centrifugal compressor located at one end of said housing adapted to accelerate the vapor formed in the evaporation chamber and maintain the evaporation chamber at a reduced pressure; a fixed blade compressor disposed radially about the centrifugal compressor to receive and compress the accelerated vapor; a condensation chamber surrounding the evaporation chamber the condensation chamber being adapted to transfer heat given off by the condensing vapor to the evaporation chamber; and means to feed contaminated liquid to the evaporation chamber;
means to withdraw concentrated liquid from the evaporation chamber and return it to the processing cycle; and means for withdrawing the purified condensed vapor from the condensation chamber and returning it to a rinse cycle.
a vapor compression still including: a housing;
an evaporation chamber contained within the housing; an evaporation surface contained within said housing; a centrifugal compressor located at one end of said housing adapted to accelerate the vapor formed in the evaporation chamber and maintain the evaporation chamber at a reduced pressure; a fixed blade compressor disposed radially about the centrifugal compressor to receive and compress the accelerated vapor; a condensation chamber surrounding the evaporation chamber the condensation chamber being adapted to transfer heat given off by the condensing vapor to the evaporation chamber; and means to feed contaminated liquid to the evaporation chamber;
means to withdraw concentrated liquid from the evaporation chamber and return it to the processing cycle; and means for withdrawing the purified condensed vapor from the condensation chamber and returning it to a rinse cycle.
2. The system of claim 1 having means for mixing a portion of the condensed pure vapor with the contaminated rinse water to control the concentration of the concentrated liquid.
3. The system of claim 1 where the housing is an inverted cone and the evaporation surface is an archemedian spiral which terminates near the apex of the cone.
4. The system of claim 1 where the centrifugal compressor is driven by a variable speed drive means and the drive means can be controlled to vary the amount of solvent extracted thereby, maintaining a uniform output concentration with a variable input concentration.
5. The system of claim 1 where the evaporation surfaces comprise a plurality of hollow cones disposed within the evaporation chamber and the interior cavity within the cones comprises a portion of the condensation chamber.
6. A continuous system for use in a processing cycle, the system being adapted to treat contaminated rinse water containing valuable materials comprising:
a vapor compression still including: a housing;
an evaporation chamber contained within the housing; means to feed contaminated liquid to the evaporation chamber; an evaporation surface contained within said housing; a compressor located at the upper end of said housing adapted to accelerate the vapor formed in the evaporation chamber, thereby adding energy to the vapor, and maintain the evaporation chamber at a reduced pressure; a fixed blade compressor disposed radially about the compressor to receive and compress the accelerated vapor; and a condensation chamber surrounding the evaporation chamber, and adapted to receive and condense the compressed vapor, the condensation chamber being adapted to transfer heat given off by the condensing vapor to the contaminated liquid within the vaporation chamber to help evaporate water vapor from the contaminated liquid;
means to withdraw concentrated liquid from the evaporation chamber and return it to the processing cycle; and means for withdrawing the purified condensed vapor from the condensation chamber and returning it to a rinse cycle.
a vapor compression still including: a housing;
an evaporation chamber contained within the housing; means to feed contaminated liquid to the evaporation chamber; an evaporation surface contained within said housing; a compressor located at the upper end of said housing adapted to accelerate the vapor formed in the evaporation chamber, thereby adding energy to the vapor, and maintain the evaporation chamber at a reduced pressure; a fixed blade compressor disposed radially about the compressor to receive and compress the accelerated vapor; and a condensation chamber surrounding the evaporation chamber, and adapted to receive and condense the compressed vapor, the condensation chamber being adapted to transfer heat given off by the condensing vapor to the contaminated liquid within the vaporation chamber to help evaporate water vapor from the contaminated liquid;
means to withdraw concentrated liquid from the evaporation chamber and return it to the processing cycle; and means for withdrawing the purified condensed vapor from the condensation chamber and returning it to a rinse cycle.
7. The system of claim 1, wherein said compressor is a centrifugal compressor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67358076A | 1976-04-05 | 1976-04-05 | |
| US673,580 | 1976-04-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084832A true CA1084832A (en) | 1980-09-02 |
Family
ID=24703230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,549A Expired CA1084832A (en) | 1976-04-05 | 1977-04-05 | Vapor compression liquid treating system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1084832A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116271909A (en) * | 2023-04-13 | 2023-06-23 | 扬州嘉明环保科技有限公司 | Industrial dilute sulfuric acid distillation concentration tower |
-
1977
- 1977-04-05 CA CA275,549A patent/CA1084832A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116271909A (en) * | 2023-04-13 | 2023-06-23 | 扬州嘉明环保科技有限公司 | Industrial dilute sulfuric acid distillation concentration tower |
| CN116271909B (en) * | 2023-04-13 | 2024-01-16 | 扬州嘉明环保科技有限公司 | Industrial dilute sulfuric acid distillation concentration tower |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |