WO1995006504A1 - Procede et appareil de distillation sous pression reduite - Google Patents
Procede et appareil de distillation sous pression reduite Download PDFInfo
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- WO1995006504A1 WO1995006504A1 PCT/JP1994/000913 JP9400913W WO9506504A1 WO 1995006504 A1 WO1995006504 A1 WO 1995006504A1 JP 9400913 W JP9400913 W JP 9400913W WO 9506504 A1 WO9506504 A1 WO 9506504A1
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- liquid
- treated
- still
- distillation
- oil
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
- B01D3/101—Recirculation of the fluid used as fluid working medium in a vacuum creating device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0041—Use of fluids
- B01D1/0047—Use of fluids in a closed circuit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0041—Use of fluids
- B01D1/0052—Use of a liquid transfer medium or intermediate fluid, e.g. bain-marie
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
Definitions
- the present invention relates to a reduced-pressure distillation method and a reduced-pressure distillation apparatus suitable for regenerating a liquid to be treated containing various dirt components such as oil-based dirt and solid-type dirt, and particularly to a non-aqueous solvent containing various dirt components.
- the present invention relates to a reduced-pressure distillation method and a reduced-pressure distillation apparatus suitable for the regeneration of methane. Background art
- Various parts such as metal parts, plating parts, painted parts, electronic parts, and semiconductor parts are subject to various types of dirt, including machining oils such as cutting oil, flux, dust, etc. during the manufacturing and assembly processes.
- cleaning of various parts having such stains has been generally performed with a halogenated hydrocarbon solvent represented by CFC.
- halogenated hydrocarbon solvents have long been known to have harmful effects on the human body, such as liver damage and carcinogenicity, as clarified by legal regulations such as the Ordinance on Prevention of Organic Solvent Poisoning.
- Recently, not only the human body, but also environmental impacts such as groundwater pollution and destruction of the ozone layer have been regarded as problems. For this reason, there is a strong demand for cleaning solvents that can be substituted for halogenated hydrocarbon solvents and that do not adversely affect the human body or the environment.
- non-aqueous solvents such as silicone solvents, hydrocarbon solvents, perfluorocarbon solvents, and terpene solvents have been proposed as alternative solvents to halogenated hydrocarbon solvents.
- Cleaning methods are being studied.
- it is important to establish a method for regenerating the used non-aqueous solvent. That is, when mechanical parts and electronic parts are cleaned using a non-aqueous solvent, various stains adhering to the parts to be cleaned are mixed into the non-aqueous solvent for cleaning and provided in the cleaning device. Just remove through a filter etc.
- non-aqueous solvents as described above are generally expensive solvents, and furthermore, it is necessary to make them reusable from the viewpoint of resource saving.
- the simplest way to treat non-aqueous solvents is to regenerate by heating and condensing at atmospheric pressure.
- the so-called simple distillation method can be used, it is extremely dangerous to heat a flammable non-aqueous solvent to the boiling point. Therefore, application of reduced-pressure distillation as a method for treating and regenerating a non-aqueous solvent as described above is being studied. According to the distillation under reduced pressure, the heat temperature can be reduced, and it is highly possible that a high-load, high-concentration solvent can be efficiently treated.
- the amount used is less than that of petroleum solvents for dry cleaning. Extremely large. As described above, when a large amount of a non-aqueous solvent or the like is regenerated, there is a problem that the conventional vacuum distillation method or the conventional vacuum distillation apparatus cannot efficiently regenerate.
- the conventional vacuum distillation method and the conventional vacuum distillation apparatus have a problem that a relatively large amount of a liquid to be treated such as a non-aqueous solvent cannot be efficiently regenerated.
- a non-aqueous solvent is used for cleaning various industrial parts, the solvent used must be able to be accurately and efficiently regenerated in order to improve the washing quality and reduce the cost of washing. is important.
- the present invention is based on the fact that the above-mentioned problems are caused by incidental facilities such as a vacuum generator and a heating source, and idle time caused by disposal of distillation residue, and furthermore, water or sulfur mixed in by an azeotropic phenomenon or the like. It was made because it was found to be caused by impurities such as chlorine and chlorine.
- a main object of the present invention is to provide a reduced-pressure distillation method and a reduced-pressure distillation apparatus capable of efficiently regenerating a liquid to be treated such as a non-aqueous solvent containing various contaminant components.
- a more specific object of the present invention is to efficiently and accurately regenerate a liquid to be treated such as a non-aqueous solvent containing a dirt component by preventing a reduction in rectification caused by a vacuum generator.
- Another object of the present invention is to provide a reduced pressure distillation method and a reduced pressure distillation apparatus which can reduce the regeneration quality due to the azeotropic phenomenon and the like.
- Another object of the present invention is to prevent the decrease in the rectification degree due to the heating source, and to efficiently and accurately regenerate the liquid to be treated such as a non-aqueous solvent containing a dirt component.
- Still another object of the present invention is to reduce the time and labor required for discharging distillation residues, thereby enabling efficient and safe regeneration of a liquid to be treated such as a non-aqueous solvent containing a dirt component.
- the liquid to be treated is heated and evaporated under reduced pressure in a still pot, and the vapor is condensed and liquefied.
- the distillate is circulated through a liquid storage tank, and the inside of the distillation still is depressurized to a predetermined degree of pressure using an ejector interposed in the distillate circulation system.
- the liquid to be treated is heated and evaporated under reduced pressure in a distillation still to condense and liquefy the vapor, and the residue from the heating and evaporation is left in the still still.
- a third reduced-pressure distillation method in the reduced-pressure distillation method in which a liquid to be treated is heated and evaporated under reduced pressure in a distillation still to condense and liquefy the vapor to regenerate the liquid to be treated, It is characterized in that the treatment liquid is heated using a heat-resistant oil as a heating medium.
- the low-pressure distillation method of the present invention is suitable for treating and regenerating a non-aqueous solvent containing a soil component by distillation under reduced pressure.
- the first reduced-pressure distillation apparatus of the present invention includes a distillation still for heating and evaporating the liquid to be treated under reduced pressure, a cooler for condensing and liquefying the vapor of the liquid to be treated, and a condensed and liquefied distillate.
- An ejector inserted into a circulation system for circulating through the liquid storage tank and depressurizing the inside of the distillation still to a predetermined pressure reduction degree is provided.
- the first vacuum distillation apparatus has a heating mechanism, and the heating mechanism A distillation still for heating and evaporating the liquid to be treated under low pressure, a cooler connected to the distillation still for condensing and liquefying the vapor of the liquid to be treated, and a distillate condensed and liquefied.
- a circulation system that circulates through a separator; and a vacuum generation unit that is connected to the distillation still via the cooler, wherein the vacuum generation unit is inserted into a circulation system of the distillate. It is characterized by having an ejector which is provided.
- the second reduced-pressure distillation apparatus includes: a distillation vessel for heating and evaporating the liquid to be treated under reduced pressure; a cooler for condensing and liquefying the vapor of the liquid to be treated; And a storage tank for storing the residue of the liquid to be treated remaining in the distillation still by heating and evaporation.
- the second reduced-pressure distillation apparatus has a heating mechanism, and is connected to the distillation still to heat and evaporate the liquid to be treated under reduced pressure by the heating mechanism;
- a liquid storage tank further includes cooling means for cooling the residue, and is configured to discharge the liquid from the liquid storage tank after cooling the residue.
- the third low pressure distillation apparatus has a heating mechanism using a heat-resistant foil as a heating medium, wherein the heating mechanism heats and evaporates the liquid to be treated under reduced pressure. It is characterized by comprising a cooler which is connected in communication and condenses and liquefies the vapor of the liquid to be treated, and a vacuum generating means which is connected to the distillation still via the cooler.
- the heating mechanism may include a first heat exchange channel provided in the distillation still and a second heat exchange channel provided to surround an outer periphery of the distillation still.
- a heat exchange channel having at least one of the above heat exchange channels, an oil heater for heating the heat-resistant oil, and circulating the heat-resistant oil heated by the wheel heater through the heat exchange channel.
- a circulation pump a circulation pump.
- the heating mechanism is provided to surround an outer periphery of the distillation still, and has a heating tank filled with the heat-resistant oil.
- An oil circulation straightening plate erected inside the heating tank to surround the oil circulation straightening plate, an oil passage channel provided below the oil circulation straightening plate, and an oil circulation straightening plate installed inside the oil circulation straightening plate. And a heater for heating the heat-resistant oil.
- the vacuum distillation apparatus of the present invention is suitable for vacuum-distilling a non-aqueous solvent containing a dirt component as a liquid to be treated.
- vacuum pumps such as gear pumps, reciprocating piston pumps, and rotary pumps have been generally used as vacuum generators for vacuum distillation.
- Vacuum pumps are equipped with mechanical moving parts such as gears, pistons, and mouths, and oils such as lubricating oil and grease are indispensable for these moving parts.
- the present inventors have found that if a vacuum pump is used during vacuum distillation, the fats and oils used in the vacuum pump will be mixed into the regenerating solution, and the rectification degree will decrease. If the degree of rectification is reduced in this way, reprocessing becomes necessary, and inspection and maintenance of the vacuum distillation apparatus are inevitable, which lowers the regeneration efficiency of the liquid to be treated.
- vacuum pumps have moving parts, so maintenance is not only troublesome, but if they are used for a long period of time, their functions deteriorate due to wear, and their durability is not sufficient.
- a vacuum pump When a vacuum pump is used for a vacuum distillation apparatus, two tanks with shut-off valves provided at the inlet and outlet are connected to each other. During vacuum distillation, the regenerating liquid is stored in a tank that is in a vacuum state. It is necessary to operate the closing valve several times to return the atmospheric pressure to the atmosphere during the evening before removing the regenerated solvent. The present inventors have found that these operations are not only troublesome, but also cause a decrease in the regeneration efficiency of the liquid to be treated, as well as a decrease in the rectification degree.
- waste liquid (sludge) composed of oils and fats remains in the distillation still as distillation residue, and must be periodically discharged from the bottom of the still.
- the residue in the still must be discharged after the temperature of the residue has dropped to about room temperature.
- the inside of the still must be newly depressurized to a predetermined degree of pressure after discharging the residue. Due to these reasons, a considerable amount of idle time is required from the end of operation to the start of operation again. The present inventors have found that this also causes a reduction in the treatment and regeneration efficiency of the liquid to be treated.
- the present invention has been made based on the various findings described above.
- an ejector is inserted into a circulation system through a liquid storage tank, and the inside of the distillation still is reduced to a predetermined degree of vacuum by a suction force of the ejector. Therefore, unlike conventional vacuum generators, fats and oils are not mixed into the distillate due to the vacuum generator, and it is possible to efficiently and accurately perform vacuum distillation.
- a step of discharging the residue remaining in the still is provided in a liquid storage tank having the same degree of reduced pressure as the still, so that the vacuum system including the still is connected. The residue can be discharged from the still without breaking. As a result, the time and labor required for discharging the residue can be significantly reduced, and the vacuum distillation can be performed efficiently and safely.
- the first vacuum distillation unit an ejector is inserted into the circulation system through the storage tank. Then, the inside of the still is kept at a predetermined reduced pressure by the suction force of the ejector. Therefore, unlike conventional vacuum generators, fats and oils are not mixed into the distillate due to the vacuum generator, so that vacuum distillation can be performed efficiently and with high accuracy. .
- a water separator for separating water mixed in the distillate due to azeotropic phenomena and also impurities such as sulfur and chlorine is provided.
- An ejector is inserted into the circulation system via the water separator, and the inside of the distillation still is reduced to a predetermined pressure by the suction force of the ejector. Accordingly, the degree of rectification can be improved by the water separator, and no oil or fat is mixed in the distillate due to the vacuum generator. These make it possible to carry out vacuum distillation efficiently and with high precision.
- the residue remaining in the distillation still is discharged into a storage tank with a reduced pressure equivalent to that of the distillation still, so that the distillation is performed without breaking the vacuum system including the distillation still.
- the residue can be discharged from the kettle.
- the time and labor required for discharging the residue can be significantly reduced, and the vacuum distillation can be performed efficiently and safely.
- a storage pipe connected to a distillation still and a residue discharge pipe and connected to a distillation pipe so as to have the same degree of reduced pressure as that of the distillation still is used.
- a liquid tank is provided.
- the residue can be discharged from the still to the liquid storage tank without breaking the vacuum system including the still.
- the time and labor required for discharging the residue can be greatly reduced, and the vacuum distillation can be performed efficiently and safely.
- by providing a cooling mechanism in the liquid storage tank it is possible to safely remove the residue stored in the liquid storage tank after cooling.
- the third vacuum distillation apparatus has a heating mechanism using heat-resistant oil as a heating medium, temperature control in the distillation still becomes easy.
- temperature control in the distillation still becomes easy.
- the liquid to be treated can be efficiently heated by the temperature-controlled heat-resistant oil. Therefore, the liquid to be treated can be heated and evaporated in a state in which it is accurately controlled in an appropriate temperature range, so that the rectification can be improved. Therefore, vacuum evaporation can be performed efficiently and with high precision. Can be carried out.
- FIG. 1 is a diagram showing a configuration of a vacuum distillation regeneration apparatus according to one embodiment of the present invention
- FIG. 2 is an enlarged sectional view showing a distillation pot portion of the vacuum distillation regeneration apparatus shown in FIG. 1
- FIG. 3 is shown in FIG.
- FIG. 4A is a schematic block diagram showing the electric control means of the vacuum distillation regeneration device
- FIG. 4A is a top view of the filter of the moisture separator used in the vacuum distillation regeneration device shown in FIG. 1
- FIG. 4B is a filter of the moisture separator.
- FIG. 5 is a view showing a waste liquid tank portion of the low-pressure distillation regeneration apparatus shown in FIG. 1
- FIG. 6 is a view showing a moving state of the waste liquid tank shown in FIG. 5, and FIG. FIG.
- FIG. 1 is a diagram showing an example of a timing chart of the vacuum distillation regeneration apparatus shown in FIG. 1;
- FIG. 8 is a cross-sectional view showing the main configuration of a vacuum distillation regeneration apparatus according to another embodiment of the present invention;
- FIG. 10 is a cross-sectional view showing a configuration of a main part of a vacuum distillation regeneration apparatus according to another embodiment. Is a diagram illustrating an example of a pressure curve.
- FIG. 1 is a diagram showing a configuration of a reduced-pressure distillation regeneration apparatus according to one embodiment to which the present invention is applied.
- reference numeral 1 denotes a substantially cylindrical distillation still having pressure resistance.
- the still 1 has a coiled or parallel first heat exchange channel 2 disposed therein and covers the outside of the bottom of the still 1.
- the jacket-shaped second heat exchange channel 3 is provided.
- examples of the solvent to be treated include non-aqueous solvents containing various dirt components used as a cleaning solvent.
- the cleaning solvents to be used include silicone solvents, hydrocarbon solvents including petroleum solvents, perfluorocarbon solvents, terbene solvents, etc., and cleaning of surfactants and alcohols. Examples thereof include those to which an active ingredient and various additives are added.
- the dirt components removed by vacuum distillation are particularly The present invention is not limited to this, and various stain components can be removed from organic stains such as oil and fat stains to inorganic stains such as solid matter stains. Further, in the case where the cleaning solvent contains a surfactant, alcohol, or the like, if these have a higher boiling point than the non-aqueous solvent, they can be removed in the same manner as the dirt component.
- the degree of decompression in the distillation still 1 shall be appropriately set based on the vapor pressure curve of the non-aqueous solvent to be treated.
- FIG. 10 shows vapor pressure curves of octamethylcyclotetrasiloxane as an example of a silicone-based solvent, naphthenic hydrocarbons as an example of a hydrocarbon-based solvent, and a special alcohol.
- the degree of pressure reduction in the distillation still 1 may be set based on such a vapor pressure curve.
- the vacuum distillation regeneration apparatus of this embodiment can be applied not only to distillation and regeneration of non-aqueous solvents such as non-aqueous detergents, but also to distillation and regeneration of aqueous detergents.
- non-aqueous solvents such as non-aqueous detergents
- aqueous detergents for example, as shown in Fig. 10, it is necessary to heat the aqueous cleaning agent to 100 ° C under atmospheric pressure.By reducing the pressure of the aqueous cleaning agent to a lower temperature, for example, 90 Torr, 5 (boiling at TC) It can be evaporated.
- Heat-resistant oil as a heating medium is supplied from the oil heater 4 to the first and second heat exchange channels 2 and 3 while being heated.
- the heat-resistant oil used as the heating medium has a high boiling point (for example, a boiling point of 250 ° C or more), a flame retardancy or a high flash point (for example, a flash point of 230 ° C or more), Mineral oils and synthetic oils having excellent viscosity and thermal conductivity are exemplified.
- a synthetic heat carrier oil having excellent oxidation stability for example, Daphne Alphather 22A (trade name, manufactured by Idemitsu Kosan Co., Ltd.) ), And High Tech 32 (trade name, manufactured by Nippon Oil Co., Ltd.) are preferred.
- the oil heater 4 is provided with a heater, for example, an electric heater 7 in a lower part of an oil tank 6 containing a heat-resistant oil (heating oil) 5 as a heating medium.
- the oil tank 6 is provided with an oil level detector 8 for electrically detecting the amount of oil by vertically moving the float.
- An outside air communication pipe 9 having one end open to the atmosphere is connected to the upper part of the oil tank 6.
- An oil supply pipe 10 is connected to the outlet side of the oil tower 6, and the oil supply pipe
- An oil circulation pump 11 and an oil temperature detector 12 are inserted in the middle of 10
- An oil recirculation pipe 13 for returning oil from the still 1 is connected to the inlet side of the oil tank 6.
- the oil supply pipe 10 is connected to an inlet side located below the first heat exchange flow path 2.
- the outlet of the first heat exchange channel 2 opened on the side of the still 1 and the inlet of the second heat exchange channel 3 opened on the bottom are connected by a communication pipe 14.
- the above-described oil recirculation pipe 13 is connected to the outlet of the second heat exchange flow path 3 opened on the side surface.
- the outlet side located above the first heat exchange channel 2 communicates with the inlet side located below the second heat exchange channel 3 and the outlet side located above the second heat exchange channel 3
- the outlet side is connected to the inlet side of the oil heater.
- the second heat exchange flow path 3 has a jacket-like force in which the lower part of the still 1 is housed in the overall shape.
- the long flow path is formed by partitioning the inside with a partition plate. It is configured so that the lower part of the still 1 can be efficiently heated in the process in which the heating tool flowing from the inlet passes through the long flow path.
- two electric heaters 7 (7a, 7b) that can be separately energized to the oil heater 4 are provided. These electric heaters 7a and 7b are controlled by electric control means 15 (shown in FIG. 3), which will be described later.
- One electric heater 7a is constantly energized during the distillation step and the boiling down step to heat the oil. Heat is kept, and the other electric heater 7b repeats turning on and off based on the signal from the oil temperature detector 12 to heat the oil.
- the electric control means 15 detects that the oil temperature has reached the preset upper limit temperature based on the signal from the oil temperature detector 12, the electric control means 15 turns on one of the electric The heater 7a is kept energized to keep the oil warm by energization, and the energization of the other electric heater 7b is stopped. Then, when it is detected that the temperature of the oil has dropped to the lower limit temperature set in advance based on a signal from the oil temperature detector 12, two electric control means 14 are provided. Apply electricity to the electric heaters 7a and 7b to heat the oil.
- the temperature of the oil heated by the oil heater 4 can accurately maintain an appropriate temperature between the upper limit temperature and the lower limit temperature, and furthermore, keeps the temperature of the one of the electric heaters 7a which is always operating. There is no sharp drop due to the action. For this reason, when heating oil is supplied to the distillation still 1, the temperature of the heating oil is stable, The solvent to be treated can be heated and evaporated in a stable state at a temperature suitable for the volatilization characteristics of the agent (appropriate temperature range between a preset upper limit temperature and lower limit temperature), thereby improving rectification. Can be enhanced. Also, compared to the case where steam is used as a conventional heating source, the labor and cost required for installation and management of incidental equipment can be significantly reduced.
- the gas in the oil tank 6 is discharged to the atmosphere from the outside air communication pipe 9, so that the oil tank 6 Can be prevented. If the oil in the oil tank 6 is abnormally low, the electric control means 15 stops the energization of all the electric heaters 7 based on the signal from the oil level detector 8. There is no danger of empty cooking.
- the position of the oil temperature detector 12 is not limited as long as the oil temperature detector 12 is disposed between the heat exchange channels 2 and 3 of the distillation still 1 from within the oil heater 4. The heating oil heated to an appropriate temperature by the oil heater 4 described above is pumped to the distillation still 1 through the oil supply pipe 10 by the operation of the oil circulation pump 11.
- the heating oil when the heating oil is supplied under pressure from the inlet of the first heat exchange channel 2, heat is generated during the flow of the heating oil through the first heat exchange channel 2.
- the solvent is transferred to the solvent to be treated, thereby heating the solvent to be treated.
- the heating oil flowing out of the outlet of the first heat exchange channel 2 is supplied to the inlet of the second heat exchange channel 3 through the communication pipe 14, and is supplied to the inside of the second heat exchange channel 3.
- heat is transferred from the outside of the still 1 to the solvent to be treated inside. Therefore, the solvent to be treated contained in the distillation still 1 is directly heated from the inside by the immersed first heat exchange flow passage 2, and is further heated from the outside by the second heat exchange flow passage 3. It will be heated again indirectly through the thickness of 1.
- the heating oil flows in from the inlet located in the lower portion, exits from the outlet located in the upper portion, and is also located in the lower portion in the second heat exchange channel 3. Heating oil flows in from the inlet side where it is placed, exits from the outlet side located at the top, and returns to the oil heater 4, so that bubbles may enter the heating oil, or the heat exchange channels 2, 3 Even if air bubbles are present in the air, the heating oil easily flows into each of the heat exchange channels 2 and 3 and is not blocked by the air bubbles. Therefore, each heat exchange channel 2, In (3), there is no obstacle to heat transfer due to bubbles, and efficient heating is ensured.
- the heat-resistant oil that functions as a heating medium circulates through the oil heater 4, the first heat exchange channel 2 and the second heat exchange channel 3, and transfers the heat of the electric heater 7 into the distillation still 1. To the solvent to be treated, thereby efficiently heating the solvent to be treated.
- the flow path of the heating oil is distributed from the first heat exchange flow path 2 provided in the distillation still 1 to the second heat exchange flow path 3 provided on the outer peripheral side of the still 1 As a result, a decrease in the temperature of the heating oil due to other than heat exchange with the liquid to be treated can be suppressed, and the solvent to be treated can be efficiently heated.
- a solvent inlet 16 is formed on the lower side of the above-mentioned still 1, and a vapor outlet 17 is formed on the upper side.
- the steam outlet 17 is connected to a condenser for steam condensation, for example, a condenser 19 via a steam pipe 18.
- a waste liquid outlet 20 is formed at a lower portion of the still 1, and the waste liquid outlet 20 temporarily stores waste liquid, which is a distillation residue composed of a dirt component, through a waste liquid pipe 21.
- the reservoir is connected to the reservoir 2 2.
- the storage tank 22 and the equipment associated therewith will be described later in detail.
- a solvent pipe 24 through which a solvent injection valve 23 is inserted is connected to the solvent injection port 16.
- a liquid level regulator 25 for opening and closing the valve by moving the float up and down is provided in the middle of the solvent pipe 24, for example.
- the upper part of the liquid level regulator 25 is connected to the upper part of the still 1 Then, the liquid level of the solvent to be treated in the distillation still 1 is adjusted.
- the liquid level adjuster 25 immerses the first heat exchange flow path 2 in the solvent to be treated in the distillation still 1 and makes the liquid level of the solvent to be treated second heat.
- the open / close switching level is set so that injection is performed. Therefore, when the solvent injection valve 23 is open, the liquid level of the solvent to be treated in the still 1 is always higher than the first and second heat exchange channels 2 and 3 by the liquid level adjuster 25. Is done.
- the liquid level of the solvent to be treated in the distillation still 1 is always positioned above the first and second heat exchange channels 2 and 3, the acid contained in the vapor of the solvent to be treated is There is no direct contact with reactants such as alkali. Therefore, corrosion of the heat exchange channels 2 and 3 due to the reactants can be prevented, and the life of the device can be extended.
- the corrosion of the distillation still 1 is suppressed by a rectification net 50 described later or the like, and the corrosion state can be inspected by the reaction rod 51.
- An economizer 26 for heat exchange is provided on the upstream side of the liquid level adjuster 25 so that the solvent to be supplied to the distillation still 1 is preheated by steam derived from the distillation still 1. ing.
- a first filter 27 that adsorbs dust and the like contained in the solvent to be treated, and a second filter that adsorbs and removes reactants such as acids and alkalis contained in the solvent to be treated 2 and 8 are provided.
- the first filter 27 is for adsorbing and removing dust and the like by filter paper and the like
- the second filter 28 is for adsorbing and removing reactants such as sulfur and chlorine by an adsorbent such as zeolite. You. If the first and second filters 27 and 28 are detachable as a cartridge type, the filters can be easily replaced.
- the installation position of 8 may be reversed.
- the vacuum generator 30 is composed of a solvent circulation pump 33 provided in a solvent circulation path 32 for circulating the regenerated non-aqueous solvent through the moisture separator 31 and an ejector 34.
- the regenerated solvent guided from the lower part of the water separator 31 is supplied to the solvent circulation pump 3
- the ejector 34 again circulates through the solvent circulation path 32 to the upper part of the water separator 31, and an ejector 34 is provided in the middle of the solvent circulation path 32, and the downstream side of the check valve 29 is ejector 34 It is connected to the suction port 3-5.
- the ejector 34 has a nozzle portion 36 whose cross-sectional area of the flow path is gradually reduced, and the suction port 35 is opened in the middle of the nozzle portion 36. Therefore, when the solvent pumped from the solvent circulation pump 33 passes through the ejector 34 ', the flow velocity sharply increases when passing through the nozzle part 36, and the pressure decreases, and as a result, the nozzle part 36 , A negative pressure is generated.
- Nozzle part 3 6 The suction port 35 is connected to the upper part of the distillation still 1 via a suction valve 29, a condenser 19 and the like, and further via a steam pipe 18 so that the negative pressure generated in the ejector 34 As a result, the pressure inside the distillation still 1 is reduced to a predetermined reduced pressure state.
- the ejector 34 here refers to a nozzle section 36 set so that the cross-sectional area of the flow path gradually decreases as described above, a diffuser set such that the cross-sectional area of the flow path gradually increases, and a nozzle section 36 And a suction port 35 opened in the middle of the nozzle section, and the negative pressure generated when the driving flow passes through the nozzle section 36 causes
- the secondary flow is drawn from the suction port 35.
- the ejector 34 transports a large amount of gas or liquid at a pressure lower than the pressure of the driving flow.
- the inside of the still 1 is brought into a predetermined reduced pressure state by drawing the secondary flow, that is, the gas in the still 1 from the suction port 35.
- the ejector 34 does not require a movable part unlike a conventional vacuum generator, by setting the inside of the distillation still 1 to a predetermined reduced pressure state by using such an ejector 34, the ejector 34 is conventionally used. Oils and fats do not enter the regenerated solvent as in the vacuum generator of the above. Therefore, rectification can be improved, and as a result, processing efficiency can be improved. Also, since the ejector 34 is installed in the solvent circulation path 32 of the moisture separator 31, there is no need to install a separate circulation system or the like for operating the ejector 34, which simplifies the apparatus. Equipment costs can be reduced. Further, since the ejector 34 has no mechanically movable parts, the maintenance is simple, and there is no possibility that the suction force is reduced due to abrasion or the like, and excellent durability can be obtained.
- the solvent to be treated is heated in the distillation still 1 under reduced pressure as described above.
- the non-aqueous solvent containing the dirt component which is the solvent to be treated, leaves the dirt component in the distillation still 1 and is easily vaporized.
- the non-aqueous solvent heated in the still 1 and vaporized that is, the solvent gas, is sucked through the vapor pipe 18 and condensed and liquefied in the condenser 19.
- the condensed distillate, that is, the regenerated solvent is sucked by the suction action of the ejector 34, passes through the check valve 29, and circulates from the suction port 35 of the ejector 34 to the solvent circulation path 32. Merge with the solvent stream.
- the regenerated solvent that has merged flows into the moisture separator 31 provided downstream of the ejector 34.
- the water separator 31 is divided into an upper chamber 31a and a lower chamber 31b.
- Upper room 3 1a An element support rod 38 having an opening 37 at the top is provided substantially at the center of the element, and the element support rod 38 is covered with an element 39.
- the lower chamber 31b and the upper chamber 31a are internally connected to each other by an opening 37 formed in the element support rod 38, and also connected to the solvent circulation path 32 as described above. It is also connected externally.
- An outlet 40 for discharging the regenerated non-aqueous solvent is provided at the upper part of 3 lb of the lower chamber, and the non-aqueous solvent from which impurities such as moisture have been removed is regenerated through the outlet 40. It is led to a melting tank (not shown).
- the circulated non-aqueous solvent and the newly condensed and liquefied non-aqueous solvent are supplied from the upper part of the upper chamber 3 la, and are passed through the element 39 to be azeotropic. Due to phenomena, impurities such as water or sulfur and chlorine mixed in the regenerating solvent are removed. Part of the non-aqueous solvent guided from the opening 37 of the element indicating rod 38 to the lower chamber 31b is circulated again to the upper chamber 31a via the solvent circulation pump 33, and the remaining non-aqueous solvent remains. The non-aqueous solvent is discharged from the outlet 4 ⁇ to the reclaimed solvent tank.
- the element 39 inserted into the water separator 31 has a cylindrical shape having an insertion hole 39a into which an element support rod 38 is inserted at the center as shown in FIG.
- a filter paper section 39b is provided on the outer periphery, and a water absorbing section 39c made of a nonwoven fabric is provided on the inner circumference of the filter paper section 39b. '.
- the water separator 31 also has a role of a storage tank for temporarily storing the regenerated non-aqueous solvent, and the executor 34 serves as a circulation system through the storage tank. It can be paraphrased that it is intervened.
- a circulation system may be formed through a liquid storage tank, and the circulation system may be interposed with an executor.
- the ejector may be passed through the circulation system via the liquid storage tank.
- thermometer 41 for measuring the steam temperature is located on the distillation pot 1 side of the steam pipe 18. T / JP94 / 00913
- a decompression detector 43 is attached to the tube 42 connected to the upper part of the still 1 so that the electric control means 15 can detect the reduced pressure in the still 1. ing. Further, a bottom view window 1a is formed in a lower side portion of the still 1 so that the inside of the still 1 can be viewed from this view window.
- cooling water flows from the lower cooling water inlet 44 to the upper cooling water outlet 45, and a cooling water pipe for supplying cooling water to the cooling water inlet 44.
- a cooling water valve 47 and a cooling water strainer 48 are provided in the middle of 46.
- the cooling water discharged from the cooling water outlet 45 is stored in a storage tank described later.
- the outer peripheral shape is substantially the same as the inner peripheral shape of the still 1 at a position higher than the liquid level of the supplied solvent to be processed above the still 1
- the wire mesh 50 is detachably arranged.
- the wire mesh 50 has, for example, a wire diameter of 0.2 mm or more and a mesh of 10 to 60, and is provided with two to three wire meshes 50 stacked. Also, it is effective to make the surface of the wire mesh 50 corrugated, since a lot of space is formed between them.
- the wire mesh 50 prevents, when the non-aqueous solvent is boiled, contaminants such as oils and fats azeotroped with the solvent from rising to the upper portion of the distillation still 1 and being mixed into the solvent gas. At the same time, the substance of the dirt component is attached and removed, and the rectification is increased by these actions.
- a reaction rod 51 is inserted into the still 1 through a hole in the ceiling surface.
- the reaction rod 51 has a length that reaches near the bottom when it is inserted into the still 1, and its material is more responsive to reactants such as acid than the material constituting the still 1. It is made of a good material. For example, it is made of aluminum or copper that easily reacts with sulfur or chlorine.
- the liquid storage tank 22 provided below the distillation still 1 temporarily stores waste liquid (sludge) composed of dirt components such as oils and fats remaining in the still 1. This waste liquid is a residue from so-called distillation.
- a waste liquid inlet 52 is formed in the upper part of the It? Liquid tank 22.
- the waste liquid inlet 52 is provided with an opening / closing valve 53.
- the lower part of the waste liquid pipe 21 below the open / close valve 53, that is, the waste liquid inlet 52 is branched from the middle and connected to the conduction pipe 54, and the conduction pipe 54 is a three-way switch that can introduce outside air. It is connected to the side of the still 1 via a valve 55.
- the switching of the three-way switching valve 55 allows the liquid storage tank 22 to be selectively connected to the still 1 or the outside air.
- the three-way switching valve 55 when the three-way switching valve 55 is connected to the distillation still 1, the inside of the liquid storage tank 22 is reduced in pressure to the same extent as the distillation still 1.
- the open / close valve 53 When the open / close valve 53 is opened in this state, the waste liquid in the still 1 can flow down to the storage tank 22 from the waste liquid outlet 20 without breaking the vacuum system of the still 1. Further, when the three-way switching valve 55 is introduced to the atmosphere side, the waste liquid contained in the liquid storage tank 22 can be easily discharged from the waste liquid outlet 56.
- the storage tank 22 capable of maintaining the same reduced pressure as the distillation tank 1
- waste liquid (residue) is configured to be discharged from 1, it is possible to discharge waste liquid satisfactorily without breaking the vacuum system including the distillation still 1.
- the labor and time required for evacuation of the still 1 can be greatly reduced.
- the liquid storage tank 22 can be opened to the atmosphere by the three-way switching valve 55, the liquid can be satisfactorily discharged to the waste liquid tank 62 described later.
- a cooler 49 is provided around the outer periphery of the liquid storage tank 22.
- cooling water flows from a lower cooling water inlet 57 to an upper cooling water outlet 58. ing. This cooling water was sent from the cooling water outlet 45 of the condenser 19.
- a waste liquid outlet 56 is formed in the lower part of the liquid storage tank 22.
- the waste liquid outlet 56 is connected to a waste liquid pipe 60 inserted through a waste liquid valve 59.
- the tip of the pipe 60 is a waste liquid outlet 61. Therefore, when the waste liquid valve 59 is opened, the waste liquid temporarily stored in the storage tank 22 and cooled is discharged to the waste liquid outflow pipe.
- the liquid is discharged from the waste liquid outlet 61 through 60. Therefore, the waste liquid discharged from the still 1 can be cooled and then flown out to the waste liquid tank 62 described below, so that the waste liquid can be safely discharged.
- a mounting table 63 for mounting a waste liquid tank 62 for receiving the waste liquid is provided below the liquid tank 22 described above.
- the mounting table 63 is moved from the lower part of the liquid storage tank 22 to the front of the vacuum distillation regeneration device by a slide device 65 provided on a frame 64 supporting the vacuum distillation regeneration device (FIGS. 5 and 6). (Left direction).
- the mounting table 63 To move the mounting table 63 out of the playback device, open the door 66 provided on the front of the playback device, and move the mounting table 63 supported by the slide device 65 forward (see Figs. 5 and 6). Left side).
- the waste liquid tank 62 mounted on the mounting table 63 By pulling out the mounting table 63, the waste liquid tank 62 mounted on the mounting table 63 can also be pulled out.
- the waste liquid in the waste liquid tank 62 can be drained by pulling out the waste liquid tank 62 to the position where the waste liquid ink is taken out (FIG. 6).
- the mounting table 63 When the mounting table 63 is housed inside the vacuum distillation regeneration device (waste liquid (residue) storage position), the waste liquid in the storage tank 22 is received by the waste liquid tank 62 mounted on the mounting table 63. ( Figure 5).
- the mounting table 63 on which the waste liquid tank 62 is mounted has a predetermined position (waste liquid storage position) where the waste liquid in the storage tank 22 can be received.
- the mounting table detection sensor 67 for detecting the mounting table 63 is provided, and it is detected that the waste liquid tank 62 is mounted on the mounting table 63.
- Waste tank detection sensor 68 is provided.
- the waste liquid valve 59 provided on the waste liquid outflow pipe 60 is opened to discharge the waste liquid in the storage tank 22. Further, in the waste liquid tank 62, there is provided a waste liquid amount detection sensor 69 for detecting that the amount of waste liquid in the waste liquid tank 62 has reached a predetermined amount. When the waste liquid amount detection sensor 69 detects a predetermined amount of waste liquid, the waste liquid valve 59 provided in the waste liquid outflow pipe 60 is closed by the control of the electric control means 15 to store the waste liquid. Stop draining of waste liquid in evening tank 2 2.
- the operation of the vacuum distillation regeneration apparatus having the above configuration and the control of each member will be described with reference to the schematic block diagram of the electric control means 15 shown in FIG. 3 and the timing chart shown in FIG. I do.
- the inside of the distillation still 1 and the storage tank 2 2 are empty, and the oil heating device 4 and the heating oil circulation system including the heat exchange channels 2 and 3 are filled with oil.
- the solvent circulation system including the water separator 31 is filled with the previously regenerated solvent.
- the electric control means 15 has a microcomputer configuration, and a central processing operation circuit (CPU) in which operation procedures are programmed and stored in advance.
- CPU central processing operation circuit
- Heating oil temperature setting storage unit 104 consisting of 101, ROM 102, RAM 103, etc., which can set and store the temperature of the heating oil according to the type of solvent, and set the degree of decompression in advance.
- Boil-down timer 1 07 to set boiling time
- sludge timer 1 08 to set time to open sludge valve 5 3 in still pot 1
- waste liquid valve in tank 2 2
- the operation lamp is lit based on the signal from the electric control means 15 and the oil circulation pump 11, solvent circulation pump 33, and oil heater 4 2
- the two electric heaters 7a and 7b start operating respectively.
- the solvent injection valve 23 remains closed.
- the oil in the oil circulation system for heating circulates, and the oil supply pipe 10 from the oil heater 4 and the first heat exchange flow path 2 and the second heat exchange flow of the distillation still 1 It flows in the order of channel 3, oil return pipe 13 and returns to oil heater 4.
- the temperature of the oil in the oil circulation system gradually increases due to the operation of the electric heater 7 c
- the solvent in the solvent circulation system forms one ring, so that a suction action is generated in the ejector 34 and the pressure in the still 1 is gradually reduced.
- the temperature of the heating oil is melted.
- the distillation pot 1 When the electric control means 15 detects that the pressure reduction degree in the chamber has reached the predetermined pressure reduction degree, the distillation timer 1 ⁇ 6 is started and the cooling water valve 47 and the solvent injection valve 2 are started. 3 is opened, and one electric heater 7a of the oil heater 4 is kept on, and the other electric heater 7b is turned off.
- the non-aqueous solvent (solvent to be treated) containing the dirt component starts to be injected into the still 1.
- the amount of the solvent to be treated introduced into the distillation still 1 is adjusted by a liquid level adjuster 25 so that the liquid level of the solvent to be treated is located higher than the upper part of the second heat exchange channel 3 and Injection is performed until the heat exchange flow path 1 reaches a predetermined level at which the heat exchange flow path 2 is constantly immersed in the solvent to be treated.
- cooling water valve 47 When the cooling water valve 47 is opened, cooling water is supplied into the condenser 19 and the capacitor 19 is cooled, that is, condensed and liquefied, and the cooling water discharged from the condenser 19 is stored in the storage tank 2 2
- the storage tank 22 is cooled through the cooler 49.
- the heating rise time is longer than when the cooling oil is injected and then the heating oil is gradually heated. Can be shortened and it is efficient. Further, if the solvent is injected after the inside of the still 1 reaches a predetermined pressure level, ignition, explosion, and the like can be prevented, which is safe.
- the heating oil heated to a predetermined temperature by the oil heater 4 passes through the first heat exchange channel 2 to the second heat exchange channel 3 of the distillation still 1, the solvent to be treated in the distillation still 1 is heated. And distilled under reduced pressure. Then, the vaporized solvent gas is sucked by the suction force of the ejector 34 and sent to the condenser 19 to be condensed and liquefied. The liquefied solvent is sucked by the ejector 34 and merges with the solvent circulation flow, and the water is removed. The water is removed from the solvent outlet 40 as a pure regenerated solvent in a state where water has been removed by repeatedly passing through the separator 31.
- the solvent to be treated in the distillation still 1 is continuously distilled under reduced pressure, the solvent level in the distillation still 1 drops, but when the solvent drops to a certain extent, the liquid level controller 25 opens to pour the solvent. Therefore, vacuum distillation is continuously performed in the still 1. If the vacuum distillation is performed continuously in the distillation still 1, the heat of the heating oil is used as the heat source in this vacuum distillation, so even if the temperature of the oil is maintained by the heat of one electric heater 7a, the temperature of the oil gradually decreases. It is going down. The temperature of the oil is constantly monitored by the electric control means 15 based on a signal from the oil temperature detector 12.
- the electric control means 15 switches to the other end of the oil heater 4. Also turn on the electric heater 7b to restart heating of the heating oil.
- the other electric heater 7b When the other electric heater 7b is also turned on, the temperature of the circulating heating oil rises to the upper limit temperature in a short time, and when the temperature reaches the upper limit temperature, the electric control is performed based on a signal from the oil temperature detector 12. Means 15 turns off the other electric heater 7b and shifts again to the heat retention state by heating only the negative electric heater 7a. Therefore, the temperature of the heating oil supplied to the heat exchange channels 2 and 3 of the still 1 can reliably maintain the optimum temperature range set according to the type of the solvent. Therefore, the purity of the target substance to be regenerated by vacuum distillation, that is, the purity of the non-aqueous solvent can be increased, and the situation in which impurities are distilled under reduced pressure can be reduced.
- the above-mentioned distillation step is shifted to the boiling step when a predetermined time set in the distillation timer 106 (for example, 30 minutes for about 10% of contamination) has passed.
- the electric control means 15 starts the boiling timer 107 and closes the solvent injection valve 23.
- the control of the electric heater 7 of the oil heater 4 is the same as that of the distillation step, and the cooling water valve 47 is kept open. Therefore, the solvent in the still 1 is continuously distilled under reduced pressure, and its S gradually decreases. That is, since the solvent in the distillation still 1 is not poured even by a small amount by vacuum distillation, it is boiled down and becomes a sludge liquid having an extremely high ratio of the dirt component.
- the thermal control means 15 switches the sludge timer 108 to the start. Let me start. At this time, all the electric heaters 7 of the oil heater 4 are turned off to stop heating the oil.
- the electric control means 15 opens the sludge valve 53 when the boil-down step is completed and the process proceeds to the sludge discharge step.
- the inside of the storage tank 22 is in the same reduced pressure state as the inside of the still 1.
- the sludge valve 54 is opened, the high-temperature sludge liquid consisting of dirt such as oils and fats remaining in the distillation still 1 flows down from the distillation still 1 to the storage tank 22, and the sludge liquid is stored in the storage tank 22. It is temporarily stored in the tank 22.
- the inside of the distillation still 1 and the inside of the storage tank 22 are both in a depressurized state, the sludge liquid easily flows down to the storage tank 22 below the distillation still 1.
- the cooling water valve 47 Since the cooling water valve 47 remains open even in the sludge discharge process, the cooling water can be supplied to the cooler 47 of the liquid storage tank 22. Therefore, the sludge flowing down into the liquid storage tank 22 is rapidly cooled by the cooling water.
- the liquid storage tank 22 may be in a reduced pressure state only in the sludge discharging step.
- the electric control means 15 starts the waste liquid timer 109 and the three-way switching valve 55 is set to the outside air side.
- the mounting table detection sensor 67 detects that the mounting table 63 is set at a predetermined position
- the waste liquid tank detection sensor 68 detects that the waste liquid tank 62 is mounted on the mounting table 63.
- the waste liquid valve 52 is opened under the control of the electric control means 15, and the cooled sludge is stored in the waste liquid tank 62. Further, when a predetermined amount of waste liquid is detected by a waste liquid amount detection sensor 69 provided in the waste liquid tank 62, the waste liquid valve 59 is closed by the control of the electric control means 15, and the liquid storage tank is closed.
- the electric control means 15 closes the waste liquid valve 59, and one cycle ends.
- the three-way switching valve 55 is closed again to the outside air side, opened to the still 1 and the storage tank 22 side, and the pressure in the storage tank 22 is reduced. , Up The operation of regenerating the solvent to be treated is repeatedly performed. This greatly reduces the labor and time involved in discharging waste liquid. Further, the reduced pressure state in the distillation still 1 can be maintained separately from the liquid storage tank 22 after the sludge discharging step, so that the solvent to be treated can be regenerated immediately after the sludge discharging step.
- an alarm device such as a buzzer may be operated to notify the worker that the waste liquid is to be performed.
- the vacuum distillation regenerator may be stopped once to stop the regenerating operation. However, if the waste liquid tank 62 is not full and the regenerating operation can be continued, the operation is temporarily stopped. Without moving on to the next task.
- the waste liquid in the still 1 is transferred from the still 1 to the storage tank 22, and cooled by the cooling water flowing through the cooler 49 of the storage tank 22. Since the waste gas is discharged from the outlet 56, there is no danger of a burn or a fire due to ignition at the time of handling, which has been a problem in the conventional regenerator, and the operation can be performed safely.
- the sludge valve (opening / closing valve) 53 and the three-way switching valve 55 are linked and switched to adjust the pressure in the distillation still 1 and the storage tank 22 appropriately, so that in the distillation process and the sludge discharge process, Since the pressure in both the distillation still 1 and the storage tank 22 is reduced, the distillation process can proceed smoothly and the operation of transferring the waste liquid can be easily performed. Further, in the sludge cooling and waste liquid process (outflow process to the waste liquid tank 62), since outside air is introduced into the storage tank 22 at normal pressure, the operation of discharging the waste liquid is facilitated. It can be carried out. At this time, since the inside of the distillation still 1 is kept under reduced pressure, the distillation step can be continued.
- the above-mentioned sludge cooling and waste liquid processes can be arbitrarily performed at any time irrespective of the distillation process.
- the distillation process is immediately restarted. be able to.
- the distillation process can be continued without any idle time, and the non-aqueous solvent containing the fouling component can be efficiently regenerated.
- the vacuum distillation regenerating apparatus of the above embodiment takes about 60 seconds after the completion of the sludge boiling down step.
- the distillation process only needs to be stopped during the sludge discharge process at 13 degrees (the process of flowing the hot sludge liquid from the still 1 to the storage tank 22). That is, the idle time between the distillation steps is about 60 seconds. This is based on maintaining the degree of decompression of the still 1 as described above, facilitating the discharge of sludge, and separate sludge cooling.
- the distillation still in the conventional vacuum distillation apparatus, the distillation still must be manually opened to the atmosphere after the sludge boiling process is completed. At this time, the temperature of the sludge that has been boiled down is around 100 to 120 ° C, so it cannot be released to the atmosphere as it is.
- octamethylcyclotetrasiloxane as the solvent to be treated, it takes about 4 hours to cool the sludge. The time required for this cooling and the time until the inside of the distillation still 1 is evacuated again to a predetermined degree of reduced pressure are idle times. As described above, according to the vacuum distillation regeneration apparatus of the above embodiment, idle time associated with sludge discharge can be significantly reduced.
- a substantially cylindrical distillation pot 1 having pressure resistance is provided with a heating tank 71 so as to cover an outer periphery of a lower portion thereof.
- the heating tank 71 the bottom of the still 1 is immersed from above into the inside, and is filled with heat-resistant oil as a heating medium.
- An oil circulation straightening plate 72 is provided upright on the inner bottom surface so as to surround the lower periphery of the still 1.
- the oil circulation flow straightening plate 72 has a height such that there is a space between the oil circulation flow straightening plate 72 and the upper surface of the heating tank 71, and a plurality of oil passages 73 are formed in the lower peripheral surface.
- the heat-resistant oil is filled up to a position where the oil circulation straightening plate 72 is completely immersed.
- the oil circulation flow straightening plate 72 may divide the inside of the heating tank 71 into an inner side and an outer side, and it is sufficient if there is a space above and below which oil flows back and forth.
- the heating tank 71 two electric heaters immersed in the heating medium are located inside the oil circulation straightening plate 72 and below the bottom of the distillation still 1. a and 7b are provided, and an oil temperature detector 12 for measuring oil temperature is provided. Further, an outside air communication pipe 9 whose one end is open to the atmosphere is connected to the upper part of the heating tank 71, and the inside of the heating tank 71 is connected to the atmosphere. Communicating.
- the two electric heaters 7a and 7b are controlled on and off by electric control means in the same manner as in the above-described embodiment, so that the oil temperature is always optimal for the volatile characteristics of the solvent to be treated. It is set to be within the temperature range.
- the oil heated by the heater 7 rises inside the oil circulation straightening plate 72 and heats the lower side and bottom of the still 1 It goes down above the straightening plate 72 and between the side surface of the heating tank 71 and the straightening plate 72 for roll circulation. Then, it passes through a plurality of oil passages 73 formed in the lower part of the oil circulation flow straightening plate 72 and returns to the inside of the oil circulation flow straightening plate 72 again. Therefore, the convection of the oil heated by the heater 7 is rectified by the oil circulation flow regulating plate 72, so that the lower side and the bottom of the still 1 can be efficiently heated. Further, since the heating tank 71 having the heater 7 is provided integrally with the lower part of the still 1, the entire apparatus can be made compact and installation and relocation are easy.
- the distillation still 1 has an upper circulation port 7 4 formed on the upper side of the caro heat tank 7 2 and a lower circulation port 7 5 formed on the inner bottom of the oil circulation straightening plate 7 2 by a circulation pipe 76.
- a small circulation pump 77 is provided in the middle of the circulation pipe 76.
- the other configuration is the same as that of the still described above (Fig. 8), and the configuration other than the still is also the same.
- the hot oil rises inside the oil circulation straightening plate 7 2 to heat the solvent in the distillation tank 1.
- Part of the oil whose temperature has decreased due to this solvent heating passes through the circulation pipe 76 from the upper circulation port 74 and returns to the inside of the heating tank 71 from the lower circulation port 75 at the bottom.
- the oil flows down the outside of the oil circulation flow straightening plate 72 and returns to the bottom side in the same manner as in the previous embodiment.
- the natural convection rectified by the naturally occurring oil circulation straightening plate 72 and the forced circulation by the operation of the circulation pump 77 cause the oil to flow through the oil circulation straightening plate.
- the fluid flows vigorously through the heating tank 7 1 defined by 72 and the circulation pipe 76. Since the oil circulating from the lower circulation port 75 into the heating tank 71 is directed upward in the same direction as the oil flowing due to natural convection, it also has a function of promoting natural convection.
- the heat generated by the heaters 7a and 7b is efficiently transferred to the solvent in the still 1 using oil as a medium to perform efficient reduced pressure distillation. be able to.
- the fluidity of the oil when the fluidity of the oil is increased, the fluidity of the oil in contact with the heaters 7a and 7b is also increased, so that the oil in contact with the heaters 7a and 7b locally becomes unnecessarily high in temperature. That can be avoided.
- the oil overheats and oxidizes, the oxides of the oil adhere to the heaters 7a and 7b and solidify, preventing heat radiation, and the heating wires of the heaters 7a and 7b heat up. Troubles such as disconnection can be prevented. Since the circulation pump 77 only assists the flow of oil due to natural convection, a small pump is sufficient. Industrial applicability
- the present invention since it is possible to prevent a reduction in rectification due to, for example, a vacuum generator, it is possible to efficiently and accurately distill and reproduce a liquid to be treated. In addition, the durability can be improved and the device can be simplified. Alternatively, since the time and labor required for discharging the distillation residue can be significantly reduced, the liquid to be treated can be efficiently and safely regenerated. Further, the heating temperature of the liquid to be treated can be easily controlled, and the distillation under reduced pressure can be performed under stable conditions suitable for the liquid to be treated, so that the rectification degree can be increased. Therefore, it is possible to efficiently and accurately reproduce the liquid to be treated. Thus, the present invention can be effectively used for regenerating, for example, a non-aqueous solvent containing a dirt component.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN94193723A CN1133017A (zh) | 1993-08-30 | 1994-06-06 | 减压蒸馏方法和减压蒸馏装置 |
KR1019960701085A KR960704607A (ko) | 1993-08-30 | 1994-06-06 | 감압증류방법 및 감압증류장치 |
EP94917162A EP0716867A4 (en) | 1993-08-30 | 1994-06-06 | METHOD AND DEVICE FOR DISTILLING UNDER PRESSURE |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
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JP5/235837 | 1993-08-30 | ||
JP23583793 | 1993-08-30 | ||
JP23718393 | 1993-08-31 | ||
JP5/237183 | 1993-08-31 | ||
JP24621493 | 1993-09-07 | ||
JP24621593 | 1993-09-07 | ||
JP5/246214 | 1993-09-07 | ||
JP5/246215 | 1993-09-07 | ||
JP5/246066 | 1993-09-08 | ||
JP24606693 | 1993-09-08 |
Publications (1)
Publication Number | Publication Date |
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WO1995006504A1 true WO1995006504A1 (fr) | 1995-03-09 |
Family
ID=27529954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1994/000913 WO1995006504A1 (fr) | 1993-08-30 | 1994-06-06 | Procede et appareil de distillation sous pression reduite |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0716867A4 (ja) |
JP (4) | JP3394815B2 (ja) |
KR (1) | KR960704607A (ja) |
CN (1) | CN1133017A (ja) |
TW (1) | TW260618B (ja) |
WO (1) | WO1995006504A1 (ja) |
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JPS59120202A (ja) * | 1982-12-25 | 1984-07-11 | Chubu Denki Seisakusho:Kk | 有機溶剤の回収方法とその装置 |
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CH460656A (de) * | 1967-06-12 | 1968-07-31 | Oerlikon Maschf | Verfahren zur Vernichtung von Ölemulsionen |
US3558436A (en) * | 1968-07-30 | 1971-01-26 | Auscoteng Pty Ltd | Distilation apparatus for desalinisation of saline water to recover fresh water as condensate |
JPS51101349U (ja) * | 1975-02-12 | 1976-08-14 | ||
JPS5785146U (ja) * | 1980-11-13 | 1982-05-26 | ||
JPS58128615U (ja) * | 1982-02-23 | 1983-08-31 | 島田理化工業株式会社 | 有機溶剤を用いた蒸気乾燥装置 |
JPS59135101U (ja) * | 1983-03-01 | 1984-09-10 | 関西熱化学株式会社 | 減圧濃縮装置 |
FR2634664B1 (fr) * | 1988-07-29 | 1992-06-05 | Cestar Sa | Dispositif pour le traitement des dechets industriels polluants notamment des boues industrielles de forage |
JPH03222913A (ja) * | 1990-01-29 | 1991-10-01 | Riken Kiki Kaihatsu Kk | ゆで及び揚げ物装置 |
JPH0663304A (ja) * | 1992-08-19 | 1994-03-08 | Tsukada Fuainesu:Kk | 真空蒸留装置 |
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- 1994-06-06 EP EP94917162A patent/EP0716867A4/en not_active Withdrawn
- 1994-06-06 KR KR1019960701085A patent/KR960704607A/ko not_active Application Discontinuation
- 1994-06-06 WO PCT/JP1994/000913 patent/WO1995006504A1/ja not_active Application Discontinuation
- 1994-06-06 JP JP12364294A patent/JP3394815B2/ja not_active Expired - Lifetime
- 1994-06-10 TW TW083105299A patent/TW260618B/zh active
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2002
- 2002-06-17 JP JP2002176163A patent/JP3866620B2/ja not_active Expired - Lifetime
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2006
- 2006-08-07 JP JP2006214375A patent/JP4249208B2/ja not_active Expired - Lifetime
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2008
- 2008-10-06 JP JP2008259408A patent/JP4616906B2/ja not_active Expired - Lifetime
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JPS59120202A (ja) * | 1982-12-25 | 1984-07-11 | Chubu Denki Seisakusho:Kk | 有機溶剤の回収方法とその装置 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996007460A1 (de) * | 1994-09-05 | 1996-03-14 | Jakob Hoiss | Verfahren und vorrichtung zum entsalzen von meerwasser |
US5932074A (en) * | 1994-09-05 | 1999-08-03 | Hoiss; Jakob | Method and an apparatus for the desalination of seawater |
WO2004007046A1 (de) * | 2002-07-10 | 2004-01-22 | Jakob Hoiss | Verfahren und vorrichtung zum aufbereiten von organisch und/oder anorganisch belastetem abwasser |
WO2020071367A1 (ja) * | 2018-10-02 | 2020-04-09 | 前田 和幸 | 液体中の混合物分離装置 |
CN115105849A (zh) * | 2022-08-24 | 2022-09-27 | 东营国安再生资源开发有限公司 | 一种废矿物油减压蒸馏装置及方法 |
Also Published As
Publication number | Publication date |
---|---|
JP4249208B2 (ja) | 2009-04-02 |
CN1133017A (zh) | 1996-10-09 |
JP2003010601A (ja) | 2003-01-14 |
EP0716867A1 (en) | 1996-06-19 |
JP3394815B2 (ja) | 2003-04-07 |
EP0716867A4 (en) | 1997-03-26 |
JP2006305573A (ja) | 2006-11-09 |
TW260618B (ja) | 1995-10-21 |
JP2009028726A (ja) | 2009-02-12 |
JPH07136402A (ja) | 1995-05-30 |
KR960704607A (ko) | 1996-10-09 |
JP3866620B2 (ja) | 2007-01-10 |
JP4616906B2 (ja) | 2011-01-19 |
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