JP2008212884A - Liquid concentrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently concentrate a liquid in a short time with a simple and compact-sized device. <P>SOLUTION: A liquid concentrator 1 evaporates volatile components from a liquid surface to concentrate the liquid. The concentrator has a structure in which three pipes 10, 18 and 16, different in diameter from one another, are stacked in a three-layer form, and a cylindrical space 31 is formed between the outermost layer pipe 10 and the intermediate layer pipe 18. A heated fluid, which heats the cylindrical space to a high temperature, is introduced from a warm water-feeding pipe 13. A vacuum pump, which makes a vacuum between the intermediate layer pipe 18 and the innermost layer pipe 16, is connected. Many microgrooves 23, which extend axially, are formed in the inner surface of the intermediate layer pipe. A liquid of thin membrane state 24, which drops down along the grooves and is evaporated in a low temperature, and the generated steam is introduced into the innermost layer pipe to separate volatile components. Consequently, the liquid is concentrated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid concentrator that concentrates a liquid by evaporation from a liquid surface.

  A conventional technique for concentrating a liquid is disclosed in Patent Document 1. In the vacuum evaporation and concentration apparatus described in this publication, the evaporative boiling can is disposed above the evaporative boiling can portion that generates the vapor of the liquid to be processed so that the non-volatile components in the liquid to be processed are not mixed on the evaporation condensed water side. A cooling condensing chamber for cooling and condensing steam supplied from the unit is provided. And the mist removal means is provided in the vapor | steam passage so that the liquid or solid of an evaporative boiling can part may not reach a cooling condensation chamber part.

  Another example of liquid concentration is described in US Pat. In the heating and vaporizing apparatus described in this publication, in a double cylinder including an inner cylinder and an outer cylinder, a liquid permeation plate is provided on the outer periphery of the inner cylinder. The liquid permeation plate is formed of a porous material, and a gap extending in the horizontal direction is formed below the liquid supply position provided at the top. And the liquid supplied to the upper part of the liquid osmosis | permeation board is vaporized by heating the inside of an inner cylinder.

JP 2004-344700 A JP 2004-167433 A

  When concentrating a liquid, it is required to improve heating efficiency and shorten the concentration time. In the vacuum evaporation and concentration apparatus described in Patent Document 1, a hot spot having a temperature higher than that of the surrounding area may be formed near the wall surface of the container in which the heater is introduced. When a hot spot is formed, the inside of the container cannot be heated uniformly, and the heating efficiency decreases.

  In order to heat uniformly, the container must be made smaller. However, if the container is made smaller, the area of the gas-liquid interface necessary for the liquid to evaporate is reduced, the amount of evaporation is reduced, and the time required for concentration is increased. To do. That is, it has been difficult to simultaneously improve the heating efficiency and shorten the concentration time.

  In the heating and vaporization apparatus described in Patent Document 2, the vaporization efficiency is improved by heating the porous liquid permeation plate from the inside of the inner cylinder provided on the outer surface. However, in the porous liquid permeation plate, the material to be separated once vaporized mixes with the liquid material to be separated supplied from the supply pipe, condenses and changes to liquid again, resulting in a decrease in separation efficiency. There is a risk.

  The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to concentrate a liquid with a simple and small device. Another object of the present invention is to efficiently concentrate a liquid in a short time.

  A feature of the present invention that achieves the above object is a double cylindrical structure having an outer tube and an inner tube, in a liquid concentrator in which the cylinder axis is arranged in the vertical axis direction, and is added between the outer tube and the inner tube. A cylindrical space in which a heated fluid flows is formed, and a plurality of axially extending grooves are formed on the inner peripheral surface of the inner tube. One end protrudes into the processing space formed inside the inner tube, and the other end A hollow steam discharge pipe with a portion extending from the inner pipe to the outside is arranged at the lower part of the inner pipe, and a supply pipe for supplying the liquid to be processed to the groove of the inner pipe is formed at the upper part of the inner pipe. Thus, a concentrated liquid discharge pipe for discharging the separated concentrated liquid is provided at a position different from the position where the vapor discharge pipe is disposed.

  And in this feature, a ring-shaped resistor having a grooved tube upper cover that fits with the upper end of the inner tube is formed, and a large number of gaps are formed between the outer periphery of the inner tube and the inner periphery of the outer tube. It is good to arrange at the upper end. Further, it is preferable to form a dish-shaped buffer section on the upper surface of the upper lid of the grooved tube, and it is preferable to attach a vacuum pump for making the processing space under a reduced pressure environment to the liquid concentrator. Furthermore, the concentrate tank is connected to the concentrate discharge pipe via a control valve, the vapor tank is connected to the vapor discharge pipe via a heat exchanger, and both the concentrate tank and the evaporation tank are connected to the vacuum. A pump may be provided, and a hot water discharge pipe communicating with the upper part of the cylindrical space and a hot water supply pipe communicating with the lower part of the cylindrical space may be provided.

  Another feature of the present invention that achieves the above object is to provide a liquid concentrator that evaporates and concentrates volatile components from the liquid surface, wherein three tubes having different diameters are stacked in three layers, and the outermost tube and A cylindrical space is formed between the tubes of the intermediate layer, and it is possible to guide a heated fluid that makes the cylindrical space hot. Then, a vacuum generating means for evacuating between the intermediate layer tube and the innermost layer tube is connected, and a number of fine grooves extending in the axial direction are formed on the inner surface of the intermediate layer tube. The liquid is evaporated at a low temperature, and the generated vapor is led to the innermost tube to separate volatile components to concentrate the liquid. Then, a grooved tube upper lid for receiving the liquid to be treated is disposed at the upper end of the intermediate layer tube, and a dish-shaped recess serving as a buffer is formed in the grooved tube upper lid, and a large number of grooves are formed around the grooved tube upper lid. The liquid to be treated is fed to the upper part of the intermediate layer tube and the upper part, and a thin film is formed in a fine groove formed on the inner peripheral surface of the intermediate layer tube. Is preferably formed.

  According to the present invention, since the flow path for dropping the raw material in a reduced pressure environment is formed on the inner wall surface of the pipe and the outer wall surface of the pipe is heated, heat transfer is improved and mixing of the raw material and steam can be avoided. The liquid can be concentrated with a simple and small device. Further, the heating efficiency is improved and the concentration time can be shortened.

  Hereinafter, embodiments of a liquid concentrator according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a liquid concentration system using the liquid concentrator 1. The liquid concentrator 1 evaporates volatile components from the liquid supplied to the liquid concentrator 1 to concentrate the liquid. The liquid concentrator 1 is connected to a raw material tank 90 containing a liquid to be concentrated via a raw material adjusting valve 91 that adjusts the supply flow rate of the liquid supplied to the liquid concentrator 1.

  Hot water is supplied to the liquid concentrator 1 from the hot water circulation device 92. The hot water that has heated the liquid concentrator 1 is returned to the hot water circulation device 92. The liquid concentrated by the liquid concentrator 1 is stored in a concentrate tank 97 disposed at the end of a concentrate line 81 connected to the lower part of the liquid concentrator 1. A concentrated line adjustment valve 96 that adjusts the pressure loss of the concentrated liquid line 81 and prevents the vapor from flowing back to the concentrated liquid line 81 is interposed in the concentrated liquid line 81.

  The vapor of the volatile component discharged from the liquid concentrator 1 flows into the vapor line 82 and is guided to the heat exchanger 93. And it cools to below a dew point with the heat exchanger 93, and liquefies. In the heat exchanger 93, heat is exchanged between the cooling water generated by the cooling water circulation device 94 and the vapor of the volatile component. The vapor of the volatile component liquefied by the heat exchanger 93 is stored in the evaporation tank 95. The concentrated liquid tank 97 and the evaporated liquid tank 95 are connected to a vacuum pump 98 through vacuum lines 83a and 83b. The vacuum pump 98 depressurizes the communication path formed from the raw material tank 90 to the evaporating liquid tank 95 and the concentrated liquid tank 97 from the downstream side to move the liquid and form a depressurizing environment.

  When the vacuum pump 98 is operated, the liquid to be concentrated moves from the raw material tank 90 to the liquid concentrator 1 due to a pressure difference generated by the vacuum pump 98. At this time, the raw material adjustment valve 91 is appropriately opened and closed to obtain a desired flow rate. Although not shown, auxiliary liquid feeding means such as a tube pump is used when a desired flow rate is not satisfied only by the pressure difference by the vacuum pump 98.

  Since the liquid concentrator 1 is depressurized by the vacuum pump 98 and heated by the hot water supplied from the hot water circulation device 92, a state in which volatile components in the liquid can be evaporated at a temperature of 100 ° C. or lower is formed. In this embodiment, since the liquid concentrator 1 is operated in a reduced pressure environment, less energy is required compared to boiling the liquid at atmospheric pressure. That is, when boiling water under normal atmospheric pressure, a high temperature environment as high as 100 ° C. is required, high heat energy is required, and the raw material may be denatured.

  On the other hand, in the present embodiment, since the vacuum pump 98 exhausts and depressurizes from the concentrated liquid and volatile component outlet side of the liquid concentrator 1, the boiling point decreases and low-pressure evaporation is possible. In this embodiment, hot water is used as the heating source of the liquid concentrator 1. However, when higher thermal energy is required, high temperature steam or reduced pressure low temperature steam may be used instead of hot water.

  In the liquid concentrator 1, as will be described in detail later, the evaporated volatile component and the liquid concentrate are separated. The separated gas and liquid are depressurized by the vacuum pump 98 and conveyed to the subsequent stage. As described above, the separated gas moves to the heat exchanger 93 as a vaporized volatile component, is cooled by the heat exchanger 93, becomes a liquid, and is stored in the evaporation liquid tank 95. On the other hand, the separated liquid is stored in the concentrate tank 97 as a concentrate.

  When the concentrate is stored in the concentrate tank 97, if the concentration line adjustment valve 96 is appropriately opened and closed, the resistance of the line 81 through which the concentrate flows is larger than the line 82 through which the steam flows, and the backflow of steam is prevented. . Thereby, gas-liquid separation can be ensured. In the present embodiment, the case where a specific volatile component is extracted from the stock solution and concentrated is described. However, the liquid to be concentrated may be a mixed liquid of liquids having different boiling points. In this case, the liquid having a low boiling point is a volatile component, and the liquid having a high boiling point is a non-volatile component.

  Details of the liquid concentrator 1 used in the liquid concentrating system shown in FIG. 1 will be described with reference to FIGS. In FIG. 2, the external appearance of the liquid concentrator 1 is shown with a perspective view. The liquid concentrator 1 is a cylindrical container in which an upper lid 11 and a lower lid 12 are attached to a pipe-like outer tube 10 with screws. When this liquid concentrator 1 is used, the cylindrical axis is arranged in the vertical axis direction.

  A hot water supply pipe 13 that is an inlet of hot water is attached to the lower side of the outer pipe 10. A hot water discharge pipe 14, which is an outlet of the hot water, is attached to the upper side of the outer pipe 10. The hot water supplied from the hot water circulation device 92 (see FIG. 1) is guided into the outer pipe 10 from the hot water supply pipe 13 attached to the lower part of the side, and circulates in the liquid concentrator 1 to heat the raw material.

A raw material supply pipe 15 is attached to the upper lid 11. The raw material (liquid) to be concentrated stored in the raw material tank 90 is supplied into the liquid concentrator 1 through the raw material supply pipe 15. A steam discharge pipe 16 and a concentrate discharge pipe 17 are attached to the lower lid 12. The vapor separated in the liquid concentrator 1 is led from the vapor discharge pipe 16 and the concentrated liquid is led from the concentrate discharge pipe 17 to the subsequent stage. A tube screw is formed at the tip of each tube to facilitate connection with other devices.

  In FIG. 3, the longitudinal cross-sectional view of the liquid concentrator 1 is shown. 3 is a cross-sectional view taken along arrow AA in FIG. The liquid concentrator 1 includes an outer tube 10, a grooved tube 18 through which liquid evaporates, and a vapor discharge tube 16. These three tubes 10, 18 and 16 have a triple tube structure arranged concentrically. The steam discharge pipe 16 is fixed substantially at the center of the lower lid 12, and the upper end projects from the middle of the grooved pipe 18 to slightly below the middle in the vertical direction.

  The outer tube 10 is formed such that the inner diameters of the upper end portion and the lower end portion are smaller than the inner diameter of the intermediate portion, and the grooved tube 18 is held in contact with the smaller diameter portion. The lower lid 12 is formed in an I-shaped section having a flange on the upper and lower sides, and holds the lower end of the grooved tube 18 with the upper flange. The upper end of the grooved tube 18 is held by a grooved tube upper lid 19 that is disposed below the upper lid 11 and contacts the inner peripheral surface of the outer tube 10.

  Thereby, a cylindrical space 31 extending in the vertical direction is formed between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the grooved tube 18 inside the liquid concentrator 1. A processing space 32 in which the raw material liquid is concentrated and separated is formed inside the grooved tube 18. A hot water supply pipe 13 and a hot water discharge pipe 14 communicate with the cylindrical space 31. The internal space 33 of the vapor discharge pipe 16 communicates with the processing space 32.

  The outer tube 10 and the grooved tube 18 are sealed by an O-ring 20 disposed in the contact portion, and prevent the fluid in the processing space 32 from flowing into the cylindrical space 31. In the cylindrical space 31, hot water circulates from the lower part toward the upper part as indicated by the chain line arrow in the figure. As a result, the grooved tube 18 is heated uniformly, and heat energy necessary for evaporation of the raw material liquid is given. Here, the hot water outlet / inlet can be turned upside down. However, in order to distribute the hot water evenly in the space, the arrangement of this embodiment that can expect the counterflow effect is more desirable.

  FIG. 4 shows details of the upper lid 11 part which is a raw material supply part. FIG. 4 is an enlarged view of a portion B in FIG. As will be described later, in order to efficiently evaporate the liquid with the grooved tube 18, it is necessary to feed the liquid uniformly on the circumference of the grooved tube 18. Therefore, in this embodiment, a grooved tube upper cover 19 that fits into the grooved tube is disposed at the upper end of the grooved tube 18, and a dish-shaped buffer portion 21 is provided on the upper surface of the grooved tube upper cover 19. Formed. On the outer peripheral portion of the dish-shaped buffer portion 21, a resistor 22 that is in contact with the outer tube 10 and has a gap is arranged in a ring shape.

  The resistor 22 is made of fine steel wool, metal mesh, or resin filter. The resistor 22 is packed so as to fill a gap between the grooved tube upper lid 19 and the outer tube 10. A gap space 34 is formed in the vertical direction between the resistor 22 and the grooved tube upper lid 19 and the upper lid 11, and the tip of the raw material supply tube 15 fixed to the upper lid 11 is the space 34. Protruding.

  When the raw material supply unit is configured in this manner, the liquid discharged from the raw material supply pipe 15 is temporarily stored in the dish-shaped buffer unit 21 as indicated by an arrow line in the drawing. When the supply of the raw material liquid is continued, the liquid level in the buffer unit 21 rises and eventually overflows from the buffer unit 21. The overflowing liquid passes through a large number of gaps formed in the resistor 22 and is guided to the upper surface of the inner peripheral portion of the grooved tube 18.

  Here, since the resistor is packed in the gap between the grooved tube upper lid 19 and the outer tube 10, the flow resistance of the raw material liquid increases and the flow rate is uniformly distributed in the circumferential direction. It is desirable that the upper surface of the buffer unit 21 be horizontal in order to feed the raw material liquid uniformly around the circumference of the resistor 22. Therefore, it is best to arrange the liquid concentrator 1 vertically. The raw material liquid sent out uniformly on the circumference falls along the inner wall surface of the grooved tube.

Details of the grooved tube 18 are shown in FIG. FIG. 5A is a perspective view of the upper end portion of the grooved tube 18, and FIG. 5B is a top view thereof. The grooved tube 18 has a large number of fine grooves 23 formed at substantially equal intervals on the inner peripheral surface. In the grooved tube 18 used in the present embodiment, the fins 27 that define the groove 23 have a substantially triangular shape, and the average thickness is about 0.4 mm. The grooved tube 18 has a diameter (outer diameter) of 48 mm, an axial length of 184 mm, a groove 23 depth of 4 mm, a groove width of 1.4 mm, and a number of grooves 23 of 72.

  The raw material liquid that has reached the grooved tube 18 through the resistor 22 is trapped on the walls of the grooves 23 and the fins 27 by surface tension to form a thin film 24. Then, it falls along the inner wall surface of the grooved tube 18 to the lower part of the grooved tube 18. The cross-sectional shape of the fine groove 23 is such that the thin film 24 is easily formed (having a surface tension sufficient to hold the liquid in the groove) and heat transferability that can sufficiently transmit the heat energy necessary for evaporation. As long as it is provided, a square, a triangle, a semicircle, a trapezoid, or the like is used. In this embodiment, the rectangular shape is long in the depth direction as described above so that the surface tension is sufficiently high and the thin film 24 is easily formed.

  The grooved tube 18 is heated by warm water from the outer peripheral surface side. Since the liquid is thinned, the liquid in the fine groove 23 is highly reactive to temperature. Furthermore, since the processing space 32 is decompressed, evaporation starts at a temperature lower than that at normal pressure. As a result, the volatile component contained in the raw material liquid evaporates while reaching the lower end of the grooved tube 18. The evaporation amount is determined by controlling the liquid supply amount and the hot water temperature.

According to the present embodiment, since the volatile component evaporates individually in each fine groove 23, the liquid processing amount is proportional to the number of grooves 23. That is, once the amount of evaporation of one fine groove 23 is ascertained under a certain condition, it is possible to easily obtain concentrators having different processing amounts simply by increasing or decreasing the number of grooves 23. For example, when the number of grooves 23 is 20 and 50 ml of liquid can be concentrated 10 times per minute, if the conditions such as temperature are made equal, the number of grooves 23 is increased to 40 every time. A 100 ml minute liquid can be concentrated 10 times. In order to equalize the evaporation conditions, the amount of liquid supplied to each groove 23 must be uniform. For this reason, in the present embodiment, the buffer portion 21 and the resistor 22 are provided to equalize the amount of liquid flowing on the inner surface of the grooved tube 18 in the circumferential direction.

As shown by the solid line arrow in FIG. 3, the concentrated liquid that has evaporated the volatile components and remains in the liquid descends on the inner peripheral surface of the grooved tube 18 that forms the groove 23, and the grooved tube 18 starts from the groove 23. And move to the concentrated buffer portion 25 formed between the lower lid 12 and the lower lid 12. The concentrated liquid led to the concentrated liquid buffer unit 25 is stored in the concentrated liquid tank 97 through the concentrated liquid discharge pipe 17.

  The evaporated volatile component flows into the space 33 inside the vapor discharge pipe 16 communicating with the processing space 32 as indicated by the dotted arrow in FIG. Volatile components flowing into the steam discharge pipe 16 are condensed in the heat exchanger 93 and stored in the vapor tank 95 in a liquefied state. At this time, the line 81 through which the concentrate flows is provided with a concentration line adjustment valve 96, and this valve 96 is adjusted to prevent the vapor from flowing back to the concentrate discharge pipe 17.

  This reverse flow of steam to the concentrate line 81 is prevented by adjusting the amount of protrusion that causes the steam discharge pipe 16 to protrude into the processing space 32 inside the grooved pipe 18. In the present embodiment, the amount of protrusion of the vapor discharge pipe 16 into the processing space 32 is variable so that the position can be changed according to the liquid supply amount or the like. Therefore, the vapor discharge pipe 16 was held on the lower lid 12 by an O-ring 20b held on the lower lid 12, and fixed to the lower lid 12 with a set screw (not shown) that is locked in the radial direction.

  According to the present embodiment, since the liquid concentrator has a static structure having no movable part, the reliability is higher than that with a movable part. Further, since the raw material liquid is continuously supplied and concentrated by the flow process, the processing capacity is improved. In addition, volatile components generated when the raw material liquid is heated flow toward the processing space formed inside the grooved tube, and the liquid concentrate that does not volatilize flows down into the groove, so the volatile components are concentrated. Processing efficiency is improved without recombination with the liquid. Furthermore, since the temperature of the grooved tube is higher at the lower part of the liquid concentrator, the volatile components are less likely to be condensed at the lower part, and recombination with the concentrated liquid can be prevented.

  FIG. 6 shows a modification of the grooved tube 18 used in the liquid concentrator 1 according to the present invention. This modification differs from the above embodiment in the cross-sectional shape of the groove. Concentration is possible even with the grooved tube 18 provided with the V-shaped fine groove 26 under the condition that the thin film can be easily formed, such as a small processing flow rate, that is, the condition that the liquid can be held in the fine groove 26 even with a small surface tension. The V-shaped fine groove 26 shown in this modification is a regular triangle having a side length of 1.62 mm. According to this modification, grooving is facilitated, and the grooved tube 18 can be manufactured in a short time and at a low cost.

  As mentioned above, according to the Example and modification which concern on this invention, concentration of a raw material liquid is shortened. In addition, stable concentration can be carried out with only the power to feed the liquid into the fine groove. Since the liquid thin film is formed on the fine groove bottom, the heat transfer from the outer periphery of the grooved tube is facilitated, the heating efficiency is improved, and the concentration time is shortened. Further, since the grooves of the grooved tube are arranged on the circumference at almost equal intervals, the processing amount per volume of the liquid concentrator increases, and the apparatus can be miniaturized. Since the liquid is concentrated independently in each groove, once the concentration conditions in each groove are grasped, it is possible to easily obtain concentrators with different throughput by simply increasing or decreasing the number of grooves.

1 is a block diagram of an embodiment of a liquid concentration system according to the present invention. The perspective view of the liquid concentrator which the liquid concentration system shown in FIG. 1 has. AA arrow sectional drawing of FIG. B section detail drawing of FIG. The top view and perspective view of the grooved pipe | tube used for the liquid concentrator shown in FIG. The top view of the other Example of the grooved pipe | tube used for the liquid concentrator shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid concentrator 10 Outer pipe 11 Upper cover 12 Lower cover 13 Hot water supply pipe 14 Hot water discharge pipe 15 Raw material supply pipe 16 Steam discharge pipe 17 Concentrated liquid discharge pipe 18 Grooved pipe (inner pipe)
19 Grooved tube top 20 O-ring 21 Buffer part 22 Resistor 23 (Fine) groove 24 Thin film 25 Concentrated liquid buffer part 26 V-shaped fine groove 90 Material tank 91 Material adjustment valve 92 Hot water circulation device 93 Heat exchanger 94 Cooling Water circulation device 95 Evaporate tank 96 Concentration line adjustment valve 97 Concentrate tank 98 Vacuum pump

Claims (8)

  In a liquid concentrator having a double cylindrical structure having an outer tube and an inner tube, the cylinder axis being arranged in the vertical axis direction, a cylindrical space through which a heated fluid flows between the outer tube and the inner tube A plurality of grooves extending in the axial direction are formed on the inner peripheral surface of the inner tube, and one end protrudes into the processing space formed inside the inner tube and the other end extends from the inner tube to the outside. An extending hollow steam discharge pipe is arranged at the lower part of the inner pipe, and a supply pipe for supplying the liquid to be processed to the groove portion of the inner pipe is formed at the upper part of the inner pipe, and the steam discharge pipe is arranged below the inner pipe. A liquid concentrator comprising a concentrated liquid discharge pipe for discharging the separated concentrated liquid at a position different from the position where the liquid is separated.   Provided with a grooved tube upper lid that fits with the upper end of the inner tube, and a ring-shaped resistor in which a large number of gaps are formed between the outer periphery of the inner tube and the inner periphery of the outer tube. The concentrator according to claim 1, wherein the concentrator is disposed in   4. The liquid concentrator according to claim 3, wherein a dish-shaped buffer portion is formed on the upper surface of the grooved tube upper lid.   The liquid concentrator according to claim 2 or 3, wherein a vacuum pump for bringing the processing space under a reduced pressure environment is attached to the liquid concentrator.   A concentrate tank is connected to the concentrate discharge pipe via a control valve, an evaporation tank is connected to the vapor discharge pipe via a heat exchanger, and both the concentrate tank and the evaporation tank are connected. 4. The liquid concentrator according to claim 2, further comprising a vacuum pump.   The liquid concentrator according to claim 1, further comprising a hot water discharge pipe communicating with an upper portion of the cylindrical space and a hot water supply pipe communicating with a lower portion of the cylindrical space.   In a liquid concentrator that evaporates and concentrates volatile components from the liquid surface, three tubes with different diameters are stacked in three layers, and a cylindrical space is formed between the outermost tube and the intermediate tube. It is possible to guide the heated fluid that raises the temperature of the cylindrical space, and a vacuum generating means for connecting a vacuum between the intermediate layer tube and the innermost layer tube is connected to the inner surface of the intermediate layer tube in the axial direction. A liquid characterized by forming a large number of fine grooves extending, evaporating the thin-film liquid passing through the grooves at a low temperature, and concentrating the liquid by separating the volatile components by guiding the generated vapor to the innermost tube. Concentrator.   A grooved tube upper cover for receiving the liquid to be treated is disposed at the upper end of the intermediate layer tube, and a dish-shaped recess serving as a buffer is formed on the grooved tube upper cover. The liquid to be treated is fed to the upper part of the intermediate layer tube and the upper part, and a thin film is formed in a fine groove formed on the inner peripheral surface of the intermediate layer tube. The liquid concentrator according to claim 7, wherein the liquid concentrator is formed.

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