JP2005131586A - Distillation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray type distillation device excellent in energy saving, which can apply also to raw materials containing a slurry or a solid material. <P>SOLUTION: In a Petlyuk distillation device is provided with two distillation columns intercommunicating at least at one place, at least one of two columns has a tray consisting of a fixed porous plate and a movable porous plate which can move by an external force, and by moving the movable porous plate the flow control of a steam from one distillation column to the other can be carried out. Alternatively, there is provided an inner wall Petlyuk distillation device provided with a distillation column which has an inside partition centering substantially around an intermediate portion of the distillation column and thereby a part of the inside of the distillation column is divided lengthwise to form two spaces, in which at least one of the spaces has a tray consisting of a fixed porous plate and a movable porous plate which can move by an external force, and by moving the movable porous plate the flow control of a steam from one space to the other space can be carried out. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a distillation apparatus. More specifically, the present invention relates to a distillation apparatus having a distillation column provided with a tray that can be moved by an external force.

  In recent years, from the viewpoint of energy problems, environmental problems, and the like, efficiency improvements including energy saving have been studied in various devices. Various apparatuses have been devised for the distillation apparatus. From the viewpoint of energy saving, a Petrique type distillation column as shown in FIG. 6 is used. In FIG. 6, 31 and 32 are distillation columns, and the upper and lower portions of the distillation column 32 communicate with the distillation column 31. A plurality of stages are provided in the distillation columns 31 and 32, and each stage is provided with a packing or a tray. A raw material supply port 33 is provided in a substantially central portion of the distillation column 31, and a discharge port 34 is provided in a substantially central portion of the distillation column 32, and the liquid is recovered in the solvent recovery tank 41. A vapor extraction line 35 is provided at the top of the distillation column 31, and a part of the liquid condensed by the condenser 36 is refluxed and the rest is recovered in a solvent recovery tank 37. An extraction line 38 is provided at the lower part of the distillation column 31. A part of the extraction line 38 is heated through the reboiler 39 and circulated to the distillation column 31, and the rest is recovered in the solvent recovery tank 40. .

  The case where the Petrique type distillation column shown in FIG. 6 is used to separate the components from the solvent having the three components A, B and C from the lowest boiling point will be described. The raw material introduced from the raw material supply port 33 separates the vapor rich in the A component and the B component in the upper portion of the distillation column 31 and the vapor rich in the B component and the C component in the lower portion. The A component is extracted from the vapor extraction line 35, a part of the A component condensed by the condenser 36 is refluxed to the distillation column 31, and the remaining part is recovered to the solvent recovery tank 37. The steam rich in the B component and the C component comes into contact with the heated steam rich in the C component from the bottom of the distillation column 31, and the steam rich in the B component and the C component is supplied from the lower part of the distillation column 32. . A vapor rich in the A component and the B component is supplied from the distillation column 31 to the upper portion of the distillation column 32. By contacting these vapors, the vapor rich in the A component is separated in the upper part of the distillation column 32, the vapor rich in the B component is separated in the middle of the distillation column 32, and the vapor rich in the C component is separated in the lower part of the distillation column 32. To do. Then, the vapor rich in the B component is taken out from the discharge port 34 provided in the middle part of the distillation column 32, the vapor rich in the A component and the vapor rich in the C component are returned to the distillation column 31, respectively. From the steam extraction line 35, the C component is extracted from the lower part of the distillation column 31 and separated into three components.

  In such a Petrique type distillation apparatus, there is a problem that it does not function as a distillation column when there is no pressure difference between the two distillation columns. For example, a large damper is used to forcibly create a flow of vapor or liquid. Therefore, there is a problem that the distillation efficiency is lowered. Accordingly, various improvements have been made. For example, in paragraph Nos. 0032 to 0048 of Patent Document 1, an inner cylinder is arranged in a distillation column so that the distillation column has a double structure of an inner cylinder and an outer cylinder, and a stock solution is supplied into the inner cylinder. A structured distillation column is described. However, this double cylinder structure distillation column cannot support airtightness because the inner cylinder is supported, the raw material supply line is installed in the inner cylinder, and the extraction line from the inner cylinder needs to penetrate the outer cylinder. There is a problem. Furthermore, when a tray-type distillation column is used, it is necessary to arrange the trays in the inner cylinder and the outer cylinder, which not only complicates the structure but also has a problem with airtightness. In addition, the tray type has a problem that the amount of liquid flowing through each distillation section cannot be controlled.

  Therefore, in Patent Document 1, by providing a partition in the distillation column, a first distillation unit that is a region in which a feed nozzle for supplying a raw material is provided, and a second that communicates with the upper end of the first distillation unit. A distillation apparatus using a distillation column (hereinafter referred to as an inner wall Petrique type distillation column) configured to form three distillation units called a distillation unit and a third distillation unit communicating with the lower ends of the first distillation unit is proposed. . A case where a raw material containing the above three components A, B and C is separated using an inner wall Petrique distillation column will be described with reference to FIG. In FIG. 7, the same reference numerals as those in FIG. 6 have the same functions as those in FIG. A middle partition 51 is provided at the center of the distillation column 50, and a feed nozzle 33 is provided at one portion partitioned by the middle partition 51. When the distillation column 50 is operated and the raw material is introduced from the feed nozzle 33, a first distillation section 54 is formed on the feed nozzle 33 side, and a second distillation section 55 that communicates with the upper end of the first distillation section 54. , And a third distillation section 56 that is continuous with the lower end of the first distillation section 54 is formed. First, in the distillation section 54, the vapor rich in the A component and the B component is separated in the upper portion, and the vapor rich in the B component and the C component is separated in the lower portion. The steam rich in the A component and the B component moves to the second distillation section 55, and the steam rich in the B component and the C component moves to the third distillation section 56. In the second distillation section 55, the vapor rich in the B component comes into contact with the vapor rich in the A component and the B component, and the vapor rich in the A component is separated into the upper part and the vapor rich in the B component is separated into the lower part. The third distillation section 56 is supplied with steam rich in the C component heated by the reboiler 39, and the heated steam rich in the C component comes into contact with the steam rich in the B component and the C component. The component rich steam separates into the upper part and the C component rich steam separates into the lower part. The B component is recovered from the outlet 53, and the C component is recovered from the tower bottom.

This inner wall Petrique type distillation column can eliminate the above-mentioned structural defects of the double cylinder type. However, the distillation apparatus in Patent Document 1 is a packed tower type distillation tower, and uses a packing element formed by laminating metal thin plates or wire meshes. This adjacent packing element can increase the efficiency of the packed tower by changing the orientation of the sheet metal for each element by 90 degrees, but it cannot be changed once assembled (ie during operation). There are drawbacks. Furthermore, it is described that the number of distribution holes needs to be changed in order to control the amount of liquid supplied to the first distillation section and the second distillation section, but this cannot be changed during operation. For this reason, the distillation conditions vary depending on the raw materials used, and there is a problem that adjustment must be made before the start of operation. Moreover, it is necessary to provide a distributor in each distillation part, and there also exists a problem that the cost of an installation starts. Further, as described in paragraphs 0052 to 0053 of Patent Document 1, the apparatus described in Patent Document 1 is not suitable for a tray-type distillation column, and the reason is that the structure is complicated and liquid distillation The amount of liquid flowing through the part cannot be controlled. On the other hand, a packed tower using a packing as described in Patent Document 1 cannot be used for reasons such as clogging when recovering a solvent from a raw material containing a large amount of solids such as slurry liquid or waste. There's a problem.
JP 2002-159801 A JP-A-5-115702

  The present invention is applicable to a distillation apparatus equipped with a Petrique type distillation column with excellent thermal efficiency, and an inner wall Petrique type distillation column that can be used only with a packed column in the past. An object is to provide a distillation apparatus which can be applied.

  The present invention comprises two distillation columns communicating with each other at at least one location, and a tray composed of a fixed perforated plate and a movable perforated plate movable by an external force is disposed in at least one of the two distillation columns, Provided is a distillation apparatus configured to adjust the flow rate of steam from one distillation column to the other by moving a movable perforated plate.

  In a preferred embodiment, a raw material supply port is provided in an intermediate portion of the one distillation column, and the tray is disposed at an upper portion and / or a lower portion of the raw material supply port.

  The present invention also includes a distillation column in which a middle partition is disposed around the center of the distillation column, thereby partially dividing the distillation column in the vertical direction to form two spaces, A tray composed of a fixed perforated plate and a movable perforated plate that can be moved by an external force is disposed in one space, and by moving the movable perforated plate, the flow rate of steam from one space to the other space can be adjusted. A distillation apparatus configured to be performed is provided.

  In a preferred embodiment, a raw material supply port is provided in an intermediate portion of the tower wall forming the one space, and the tray is arranged around the raw material supply port or at the upper part and / or lower part of the raw material supply port. Has been.

  According to the present invention, it is possible to configure a Petrique type distillation column using a tray. In particular, by using a tray composed of a fixed perforated plate and a movable perforated plate movable by external force (hereinafter referred to as “change tray” in this specification), the aperture ratio of the perforated plate is adjusted. A distillation apparatus capable of appropriately adjusting the amount of solvent vapor and liquid reflux to each distillation section of the Petrique distillation column even during operation is provided. Therefore, distillation is performed with high energy efficiency, and energy saving becomes possible. Furthermore, the separation and recovery of the solvent from the raw material containing a large amount of solids such as slurry liquid or waste, which cannot be performed with a packed distillation apparatus, uses a Petrique distillation column or an inner wall Petrique distillation column which is a modification thereof. Therefore, energy saving is achieved also in the recovery of these solvents.

  Hereinafter, the present invention will be described with reference to examples.

  FIG. 1 shows a Petrique type distillation apparatus having two distillation columns, which is one embodiment of the present invention, and having a change tray. Although a detailed description of the change tray is described in Patent Document 2, first, the change tray will be briefly described with reference to FIG.

  In FIG. 2, the change tray 12 is configured by alternately arranging fixed perforated plates 12a and movable perforated plates 12b. The movable perforated plate 12b is arranged so as to be movable by an external force, for example, an actuator 13 such as vertical movement (lifting / lowering), rotation, and vertical movement and rotation simultaneously. FIG. 2A is a view showing a state where no external force is applied to the movable porous plate 12b, and FIG. 2B is a view where an external force is applied to the movable porous plate 12b and the movable porous plate 12b is lowered. Pressure can be adjusted by such movement of the movable perforated plate 12b. Although not shown, the tray may be composed of an outer peripheral perforated plate and a central perforated plate, the outer peripheral perforated plate may be a fixed perforated plate, and the central perforated plate may be rotated up and down and / or rotated.

  In addition, “can move by external force” means that, as in a lift tray, it does not float depending on the flow of vapor or liquid inside the tower, but is a moving means arranged outside or inside the tower (for example, Actuator, lever rod, gear, etc.).

  In the change tray used in the present invention, a part of the holes of the fixed porous plate 12a and the non-porous part of the movable porous plate 12b overlap each other, or the non-porous part of the fixed porous plate 12a and the movable porous plate 12b. It is preferable that a part of the holes be overlapped with each other. Due to vertical movement or rotational movement, the area of the hole (opening ratio) fluctuates and the amount of pressure loss is adjusted, so it goes to two Petrique type distillation columns or to two flow paths of the inner wall Petrique type distillation apparatus. The flow rate of the vapor or liquid can be adjusted.

  When using a plurality of movable perforated plates, only one movable perforated plate may be moved, or a plurality of movable perforated plates may be moved simultaneously. The number of movable perforated plates to be moved, the moving distance (height of the movable perforated plate), etc. may be determined in consideration of the necessary flow rate of vapor or liquid. In the case of the vertical movement, for example, a means provided outside the tower such as an actuator or a lever rod is used. When an external force from the outside of the tower is used, since it is necessary to maintain sufficient airtightness, a bellows, a ground, or the like is preferably used. Alternatively, a vapor or liquid flow meter or flow sensor can be provided in the distillation column, and the movable perforated plate can be moved in conjunction with an automatic adjustment mechanism to adjust the flow rate to a predetermined value.

  When such a change tray is used, the amount of the processing liquid can be increased, and further, gas-liquid contact is sufficiently performed, so that distillation is performed with high efficiency. In addition, since the pressure can be adjusted by adjusting the aperture ratio, the required amount of steam or liquid can be supplied to the two distillation columns of the Petrique distillation apparatus, thereby further improving the distillation efficiency. In other words, the tray tray tower was used for the first time by not only functioning as a conventional gas-liquid separator, but also as a control valve, a change tray consisting of a fixed perforated plate and a movable perforated plate that can be moved by external force. Petrique type and inner wall type Petrique distillation devices are now possible. Hereinafter, returning to FIG. 1, a distillation apparatus using the change tray 12 will be described.

  The distillation apparatus in FIG. 1 has a first distillation column 1 and a second distillation column 2 attached to the first distillation column 1. The second distillation column 2 communicates with the first distillation column 1 at its upper end and lower end. A raw material supply port 11 is provided in an intermediate portion of the first distillation column 1, and a change tray 12 including a fixed porous plate 12 a and a movable porous plate 12 b is disposed around the position of the raw material supply port 11. Yes. The fixed perforated plate 12a is attached to the column wall of the first distillation column 1, and the movable perforated plate 12b is attached by an actuator 13 so as to be movable up and down. The change tray 12 is provided at least between the upper end connection portion 21 of the first distillation column 1 and the second distillation column 2 and the lower end connection portion 22 of the first distillation column 1 and the second distillation column 2. Yes. A vapor outlet 14 is provided at the top of the first distillation column 1, passes through a condenser 15, and a part of the condensate is refluxed to the solvent recovery tank 16, and the remaining part is refluxed to the first distillation column 1. Is configured to do. Further, a column bottom outlet 17 is provided at the bottom of the first distillation column 1 and is recovered in a solvent recovery tank 18, and the remaining part is heated by a reboiler 19 to be a column of the first distillation column 1. It is configured to be refluxed to the bottom.

  In FIG. 1, the raw material supply port 11 can be arranged at an arbitrary position in the intermediate portion of the first distillation column 1. That is, you may arrange | position in the upper part or the lower part of the change tray 12, or between the change trays 12 (that is, the change tray 12 exists in the upper part and the lower part of the raw material supply port 11). Thus, since the raw material supply port 11 can be arrange | positioned in the arbitrary positions of the intermediate part of the 1st distillation column 1, the raw material supply port 11 can be arrange | positioned in the optimal site | part according to the raw material to distill. In the conventional packed-packed distillation column, considering that the raw material supply port 11 cannot be provided at the site where the packing is present, the raw material supply port 11 can be arranged at an optimal site, The device of the present invention is excellent. In the present invention, a plurality of raw material supply ports 11 may be provided. During operation, it is possible to change the material supply position by connecting to the optimal material supply port. In this respect, the apparatus of the present invention using the change tray 12 is superior to the conventional apparatus. The description of the position and the number of the raw material supply ports 11 is similarly applied to the following FIGS.

  An outlet 23 is provided in the middle portion of the second distillation column 2, and the change tray 12 is disposed in the lower portion in the same manner as the first distillation column 1. The condensate extracted from the outlet 23 and condensed by the condenser 24 as needed is recovered in the solvent recovery tank 25.

  In order to perform distillation and energy saving efficiently, it is necessary to adjust the flow rate of the steam from the first distillation column 1 to the second distillation column 2. For this purpose, a flow meter 26 is disposed in the flow path from the first distillation column 1 to the second distillation column 2 at the lower end connection portion 22. Then, the flow rate of steam in this flow path is monitored, and the movable porous plate 22b of the change tray 12 is moved up and down via the actuator 13 (or 27) to adjust the flow rate to a necessary level.

  In addition, in the apparatus of FIG. 1, although the change tray 12 is arrange | positioned also in the 2nd distillation column 2, it is not necessarily required for both distillation apparatuses. When the pressure loss of the second distillation column 2 is larger than that of the first distillation column 1, the change tray 12 may be attached only to the first distillation column 1. Conversely, when the pressure loss of the first distillation column 1 is larger than that of the second distillation column 2, the change tray 12 may be attached only to the second distillation column 2. However, when attached to both, the flow rate can be adjusted more easily.

  Further, the distillation apparatus of FIG. 1 may have a configuration having an evaporation pot communicating with the first distillation column 1.

  A case where a raw material containing three components of A component, B component and C component is distilled from the lowest boiling point using the apparatus of Example 1 will be described. In FIG. 1, a region A refers to a region above the upper end connection portion 21 of the first distillation column 1, and a region B is a region between the upper end connection portion 21 and the lower end connection portion 22 of the first distillation column 1. Preferably, a change tray 12 is disposed between them. Region C refers to the region below the lower end connection portion 22 of the first distillation column 1, and region D refers to the region above the outlet 23 of the second distillation column 2.

  The raw material introduced from the raw material supply port 11 is heated in the region B of the first distillation column 1 to separate the vapor rich in the A component and the B component above the region B and the vapor rich in the B component and the C component below. To do.

  The steam rich in the A component and the B component moves to the region A of the first distillation column 1, and the steam rich in the A component moves above the region A. The vapor rich in the A component is withdrawn from the outlet 14 at the top of the column, a part of the liquid rich in the A component condensed in the condenser 15 is refluxed to the first distillation column 1, and the remaining part is a solvent recovery tank. 16 is recovered.

  The steam rich in the B component and the C component comes into contact with the steam from the bottom in the region C below the first distillation column 1, and the vapor rich in the C component is separated below the region C. The steam rich in the B component and the C component moves from the lower end connection portion 22 to the second distillation column 2. This movement is monitored by the flow meter 26. When the steam flow rate is different from the predetermined amount, the movable porous plate 12b of the change tray 12 is moved up and down via the actuator 13 (or 27) to adjust the flow rate to the predetermined amount.

  In the second distillation column 2, the vapor rich in the A component and the B component comes into contact with the heated vapor rich in the B component and the C component from the first distillation column 1, and the vapor rich in the A component is rich in the upper portion and rich in the B component. Steam is separated into the central part and C-rich steam is separated into the lower part. And the vapor | steam rich in B component is collect | recovered from the outlet 23 provided in the intermediate part of the 2nd distillation column 2, The condensate condensed with the capacitor | condenser 24 is collect | recovered by the solvent collection | recovery tank 25. FIG. The steam rich in the A component and the steam rich in the C component pass through the upper end connection portion 21 and the lower end connection portion 22, respectively, and return to the first distillation column 1. A liquid rich in component C accumulates at the bottom of the first distillation column 1.

  The liquid rich in component C is recovered from the outlet 17 at the bottom of the column to the solvent recovery tank 18, but part of it is heated by the reboiler 19 and circulated to the first distillation column 1 as heated steam. In this way, the raw material is fractionated into the A component, the B component and the C component.

  In FIG. 1, trays other than the change tray are illustrated in the A region, the C region, and the D region of the second distillation column 2, but may be filled. As a tray, the tray conventionally used for the distillation tower is used. Examples include a sheave tray without a downcomer (no weir), a baffle tray, a valve tray, a shower tray, and a lift tray. As the filler, a metal sheet, a regular filler such as a wire mesh, or an irregular filler is preferably used.

  FIG. 3 shows another aspect of the first embodiment, in which the upper portions of the first distillation column 1 and the second distillation column 2 are filled with a packing instead of a tray.

  FIG. 4 shows another embodiment of the first embodiment, in which the upper part of the first distillation column 1 is filled with a packing instead of a tray, and the second distillation column 2 is all packed with a packing. In this embodiment, the first distillation column 1 and the second distillation column 2 are communicated at one place in the lower part. In this apparatus, the flow rate from the first distillation column 1 to the second distillation column 2 is monitored by a flow meter 26 or the amount of condensate in the condenser 24 is monitored by a flow meter (not shown). To do. The flow rate is adjusted by moving the change tray 12 up and down by the actuator 13. By this adjustment, the A component hardly reaches the communication port, and the vapor rich in the B component is introduced into the second distillation column 2. The B component is recovered from the top of the second distillation column 2, and the vapor rich in the C component returns to the first distillation column 1 and is recovered from the bottom of the first distillation column 1.

  FIG. 5 is a diagram showing a schematic diagram of a distillation apparatus using an inner wall Petrique type distillation column. Hereinafter, description will be made based on FIG. 5. In FIG. 5, the same reference numerals as those in FIG.

  An intermediate partition 28 is disposed around the central portion of the distillation column 3, and a part of the distillation column 3 is divided in the vertical direction to form two spaces. Both of the two spaces formed by the partition 28 are continuous with the upper and lower spaces of the distillation column 3. A raw material supply port 11 is provided in an intermediate portion on one tower wall surface side of two spaces formed by being divided by the partition 28. An outlet 23 is provided at an intermediate portion on the other tower wall surface side. A change tray 12 composed of a fixed perforated plate 12a and a movable perforated plate 12b is disposed in a space formed between the partition 28 and the inside of the tower. In FIG. 5, the change tray 12 is disposed below the raw material supply port 11 in the space on the side having the raw material supply port 11. Alternatively, change trays 12 may be provided on both sides of the raw material supply port 11. The change tray 12 is also arranged in the space on the side having the outlet 23. Although the change tray 12 is arranged at the upper part and the lower part of the outlet 23, it may be arranged only at the upper part or the lower part of the outlet 23. As described above, the change tray 12 may be disposed on at least one side.

  A flow meter 26 (not shown) is preferably provided at the lowermost portion 29 of the partition 28 on the side having the outlet 23. Then, by moving the movable porous plate 22a up and down by the actuator 13 or 27, the flow rate is adjusted to a predetermined amount. Adjustment may be manual or linked to a computer.

  The case where the raw material containing the three components of A component, B component, and C component is distilled from the low boiling point using the inner wall Petrique type distillation column of FIG. 5 will be described. In FIG. 5, a region X indicates a region on the tower side formed with the partition 28 and provided with the raw material supply port 11. A region Y indicates a region composed of a part of the distillation column 3 (upper portion of the Y region) and a space (lower portion of the Y region) to the outlet 23 partitioned by the partition 28. The region Z is a region composed of a space from the outlet 23 of the space partitioned by the partition 28 to the lower part of the partition plate 28 (upper part of the Z region) and a part of the distillation tower 3 (lower part of the Z region). Indicates.

  The raw material introduced from the raw material supply port 11 is heated in the region X of the distillation column 3 to separate the vapor rich in the A component and the B component in the upper portion of the region X and the vapor rich in the B component and the C component in the lower portion. The vapor rich in the A component and the B component moves to the region Y, and the liquid rich in the B component and the C component moves to the region Z. The zone Z is supplied with steam rich in the C component heated by the reboiler 19, and the heated steam and the steam rich in the B component and the C component come into contact with each other. Steam separates into the bottom. Further, in the region Y, the vapor rich in the B component comes into contact with the vapor rich in the A component and the B component, so that the vapor rich in the A component is separated into the upper part and the vapor rich in the B component is separated into the lower part. The component B is recovered from the outlet 23, cooled by the condenser 24 as necessary, and recovered in the solvent recovery tank 25. The A component is withdrawn from the outlet 14 at the top of the distillation column 3, a part of the liquid rich in the A component condensed in the condenser 15 is refluxed to the distillation column 3, and the remaining part is the solvent recovery tank 16. To be recovered. The component C is recovered from the outlet 17 at the bottom of the column to the solvent recovery tank 18, but a part thereof is heated by the reboiler 19 and circulated to the distillation column 3 as heated steam. In this way, the raw material is fractionated into the A component, the B component and the C component.

  In addition, it is preferable that the partition 28 has a heat insulating structure. For example, a method of forming the inside of the partition 28 with a vacuum, for example, formed of a heat insulating material is employed.

  In FIG. 5, trays are shown in the regions X, Y, and Z. However, if at least part of the region X is a change tray, all or part of the region Y and region Z is filled. As in the case of the first embodiment, a tray other than the goods or the change tray may be used.

  The apparatus of the present invention is a tray-type distillation apparatus that efficiently and effectively uses energy from a liquid containing a slurry that cannot be distilled by a distillation apparatus filled with a packing or a liquid containing a large amount of solids. Since distillation or solvent recovery is possible, it can be used for distillation or solvent recovery from all types of raw materials.

It is a schematic diagram of the Petrique distillation apparatus of the present invention. It is a schematic diagram which shows the structure and operation | movement of a change tray. It is a schematic diagram which shows another form of the Petrique type | mold distillation apparatus of this invention. It is a schematic diagram which shows another form of the Petrique type | mold distillation apparatus of this invention. It is a schematic diagram of the distillation apparatus using the inner wall Petrique type | mold distillation column of this invention. It is a schematic diagram of the conventional Petrique type | mold distillation apparatus. It is a schematic diagram of the conventional inner wall Petrique type distillation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st distillation column 11 Raw material supply port 12 Change tray 12a Fixed porous plate 12b Movable porous plate 13, 27 Actuator 14, 17, 23 Exit 15 Condenser 16, 18, 25 Solvent recovery tank 19 Reboiler 2 2nd distillation column 21 Upper end Connection part 22 Lower end connection part 24 Condenser 26 Flow meter 28 Partition 3 Distillation tower

Claims (4)

  Two distillation columns communicating with each other at least at one place are provided, and at least one of the two distillation columns is provided with a tray composed of a fixed perforated plate and a movable perforated plate that can be moved by an external force. A distillation apparatus configured to adjust the flow rate of steam from one distillation column to the other distillation column by being moved.   The distillation apparatus according to claim 1, wherein a raw material supply port is provided in an intermediate portion of the one distillation column, and the tray is disposed at an upper portion and / or a lower portion of the raw material supply port.   A middle partition is arranged around the center of the distillation column, thereby comprising a distillation column in which a part of the distillation column is divided in the vertical direction to form two spaces, and is fixed to at least one space. A tray composed of a perforated plate and a movable perforated plate that can be moved by an external force is arranged, and the flow rate of steam from one space to the other space is adjusted by moving the movable perforated plate Distillation equipment.   The intermediate portion of the tower wall forming the one space is provided with a raw material supply port, and the tray is arranged around the raw material supply port or at the upper part and / or lower part of the raw material supply port. 3. The distillation apparatus according to 3.

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