Rectification system

Abstract

To discharge an unnecessary liquid of a distillate in a rectification system.SOLUTION: A rectification system 10 includes: a rectification tower 11; a condenser 12 which cools steam distilled from the rectification tower 11; a pot 13 for accumulating a liquid liquefied by the condenser 12; a reflux flow passage 15 for returning the liquid accumulating in the pot 13 to the rectification tower 11; and a discharge passage 16 for discharging a part of the liquid accumulating in the pot 13. The pot 13 has: a first outflow part 21 which is provided at a bottom part of the pot 13 to send the liquid to the return flow passage 15; and a second outflow part 22 for sending the liquid in an upper layer accumulating in the pot 13 to the discharge passage 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rectification system. [Background technology]

[0002] A rectification system having a rectification column is used to produce chemical products (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-007990 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, when rectifying a raw material liquid such as a solvent, water may be generated as the initial distillation in the rectification column. If this water remains in the rectification system and is contained in products in subsequent steps of the rectification process, it will degrade the quality of the products. Furthermore, the residual water dissolves in the acid and corrodes parts of the various devices in the rectification system, or reacts with metals to form salts, which can accumulate and cause malfunctions in the devices.

[0005] Therefore, an object of the present disclosure is to provide a rectification system that is capable of discharging unnecessary liquid from the distillate. [Means for solving the problem]

[0006] The present invention comprises a rectification column, a condenser for cooling vapor distilled from the rectification column, a pot for storing liquid liquefied in the condenser, a reflux flow path for returning the liquid stored in the pot to the rectification column, and a discharge flow path for discharging a portion of the liquid stored in the pot, wherein the pot has a first outlet portion provided at the bottom of the pot for sending liquid to the reflux flow path and a second outlet portion for sending the upper layer liquid stored in the pot to the discharge flow path. [Effects of the Invention]

[0007] According to the rectification system of the present invention, it is possible to discharge the unnecessary liquid from the distillate. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a configuration diagram showing an example of the rectification system of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of the pot. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV in FIG. [Figure 5] FIG. 5 is an explanatory diagram of the lower layer liquid that accumulates in the pot and the upper layer liquid that is discharged from the pot. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Outline of the embodiment of the present invention> Hereinafter, an outline of an embodiment of the present invention will be listed and described. (1) The distillation system of the present invention comprises a distillation column, a condenser for cooling the vapor distilled from the distillation column, a pot for storing the liquid liquefied in the condenser, a reflux flow path for returning the liquid stored in the pot to the distillation column, and a discharge flow path for discharging a portion of the liquid stored in the pot, wherein the pot has a first outlet portion provided at the bottom of the pot for sending the liquid to the reflux flow path and a second outlet portion for sending the upper layer liquid stored in the pot to the discharge flow path.

[0010] In the above-described rectification system, the vapor distilled from the rectification column is cooled and liquefied in the condenser, and the liquid (distillate) is collected in a pot. The distillate may contain a target liquid (product liquid) that is the target of the distillation and an unwanted liquid such as water, which is an unwanted component. Therefore, the target liquid and the unwanted liquid are mixed and collected in the pot. Due to the difference in specific gravity between the target liquid and the unwanted liquid, the target liquid and the unwanted liquid are separated at the interface, and the target liquid that becomes the lower layer in the pot is sent out from the first outlet and is able to flow through the reflux flow path. The unwanted liquid that becomes the upper layer in the pot is sent out from the second outlet and is able to flow through the discharge flow path.

[0011] (2) The pot has a cylindrical pot body capable of storing liquid, and a weir provided inside the pot body for guiding the upper layer liquid to the second outflow portion. According to the above-described configuration, the distillate is collected in the pot body, and the upper layer of the unnecessary liquid in the distillate is guided to the second outlet by the weir. The weir enhances the function of discharging the unnecessary liquid.

[0012] (3) In the distillation system of (2), the weir has a pair of opposing guide plates extending from the second outlet toward the opposite side of the second outlet in the horizontal direction, and the distance between the pair of guide plates narrows toward the second outlet. The waste liquid in the upper layer of the pot is guided along a pair of opposing guide plates to the second outlet, where the flow rate of the waste liquid increases toward the second outlet, facilitating the discharge of the waste liquid.

[0013] (4) The distillation system according to any one of (1) to (3) above has an input pipe for sending liquid from the condenser to the pot, and the input pipe has an open end that opens toward a wall portion of the pot that is horizontally opposite to the second outlet portion. The distillate that flows through the input tube and passes through its open end hits the wall of the pot and is temporarily stored in the pot body. As the distillate hits the wall, the generation of bubbles is suppressed. Due to the difference in specific gravity between the target liquid and the waste liquid, the target liquid and the waste liquid are separated at the interface. The target liquid can remain in the pot. The upper layer of waste liquid can flow to the second outflow section.

[0014] (5) The rectification system of (1) to (4) has an intermediate pipe connecting the first outflow section and the reflux flow path, and an adjustment valve provided in the intermediate pipe for adjusting the flow rate of the liquid passing through. The height of the interface between the upper and lower liquid layers in the pot is adjusted by adjusting the flow rate of the adjusting valve.

[0015] (6) The rectification system of (1) to (5) has an input pipe for sending liquid from the condenser to the pot, the input pipe having an open end that opens toward a side wall of the pot, the pot having a cylindrical pot body capable of storing liquid, a first short pipe protruding horizontally from the pot body, and a second short pipe protruding horizontally from the pot body in the opposite direction to the first short pipe, the first short pipe having a wall portion facing the open end of the input pipe, and the second short pipe having the second outlet portion that opens horizontally. The distillate that flows through the input tube and passes through its open end hits the wall of the first short tube of the pot and is temporarily stored in the pot body. As the distillate hits the wall, the generation of bubbles is suppressed. Due to the difference in specific gravity between the target liquid and the waste liquid, the target liquid and the waste liquid are separated at the interface. The target liquid can remain in the pot body. The upper layer of waste liquid can flow to the second outlet.

[0016] (7) In the rectification system of (6), the bottom of the inner periphery of the second short tube is located higher than the bottom of the inner periphery of the first short tube. As described above, the first short tube has a wall that faces the open end of the input tube, so the liquid that flows out from that open end and hits the wall is collected in the pot body. The bottom of the inner periphery of the second short tube is located higher than the bottom of the inner periphery of the first short tube. The lower layer of target liquid is collected in the pot until the interface between the upper and lower liquid layers reaches the height of the bottom of the inner periphery of the second short tube. The upper layer of unwanted liquid that is located higher than the bottom of the inner periphery of the second short tube overflows and is sent to the discharge flow path through the second outlet part of the second short tube. When the interface reaches the height position of the bottom of the inner periphery of the second short tube, all of the upper layer of unnecessary liquid can be sent out of the pot through the second outflow part to the discharge flow path.

[0017] In the case where the rectification system includes an intermediate pipe connecting the first outlet and the reflux line, and an adjusting valve provided in the intermediate pipe for adjusting the flow rate of the liquid passing through (case (5) above), the flow rate of the adjusting valve is adjusted so that the interface is at the same height as the bottom of the inner circumferential surface of the second short tube. This allows all of the upper layer of unwanted liquid to be sent from the pot to the discharge line via the second outlet. The pot allows the upper layer of water to overflow while the lower layer of the target solution is refluxed completely.

[0018] (8) In any one of the rectification systems (1) to (7), the condenser has a cavity for receiving the liquefied liquid and a vent portion connected to the cavity, an input pipe for sending the liquid from the cavity to the pot, and a pressure equalizing pipe for equalizing the internal pressure of the pot and the reflux flow path with the internal pressure of the vent portion. As the rectification process continues in the rectification column, the pressure in the condenser, the pot, and the reflux line fluctuates during the process. These pressure fluctuations cause the height of the interface between the upper and lower liquid layers stored in the pot to fluctuate. The pressure equalizing tube suppresses fluctuations in the height of the interface in the pot.

[0019] In the case where the rectification system includes an intermediate pipe connecting the first outlet and the reflux line, and an adjusting valve provided in the intermediate pipe for adjusting the flow rate of the liquid passing through (case (5) above), the flow rate of the adjusting valve is adjusted so that the interface is at the same height as the bottom of the inner circumferential surface of the second short pipe. Therefore, the pressure equalizing pipe suppresses fluctuations in the height of the interface, making it easier to adjust the flow rate of the adjusting valve.

[0020] <Details of the embodiment of the present invention> Hereinafter, the details of the embodiments of the present invention will be described. [Overall configuration of the rectification system] Fig. 1 is a configuration diagram showing an example of a rectification system of the present invention. The rectification system 10 shown in Fig. 1 includes a rectification column 11, a condenser 12, a pot 13, an intermediate pipe 14, a reflux line 15, a discharge line 16, a product line 17, an adjustment valve 18, product containers 19A and 19B, an introduction pipe 20, and a pressure equalization pipe 40.

[0021] The rectification column 11 is a distillation apparatus for performing rectification and has a column shape. The rectification column 11 has a tank 51 for storing the raw material liquid L, a heater 52 for heating the raw material liquid L, and an outlet pipe 53 connected to the condenser 12. Liquids with different boiling points are distilled in order from the rectification column 11 and sent to the condenser 12.

[0022] Condenser 12, also called a condenser, cools the vapor distilled from rectification column 11. Condenser 12 has a cavity 71 that receives the liquefied liquid (distillate) and a vent portion 72 that communicates with cavity 71. In the case of the rectification system 10 of this embodiment, the vent section 72 has a vent pipe 721. Furthermore, the vent section 72 has a pressure reduction pump 722 that is connected to the vent pipe 721 and reduces the pressure inside the condenser 12 below atmospheric pressure. Note that the pressure reduction pump 722 may be omitted, in which case the vent pipe 721 (vent section 72) is open to the atmosphere.

[0023] The input pipe 20 is a small-diameter pipe that sends the liquid (distillate) from the condenser 12 (cavity 71) to the pot 13. The input pipe 20 is connected to the bottom of the cavity 71, and the liquid in the cavity 71 is sent to the pot 13 through the input pipe 20. The liquid in the cavity 71 is sent to the pot 13 through the input pipe 20 by its own weight. The liquid flows through the input pipe 20 in a filled state.

[0024] Pot 13 is located at a lower position than condenser 12. Pot 13 collects the liquid (distillate) liquefied in condenser 12. Pot 13 has a first outlet 21 and a second outlet 22. First outlet 21 is located at the bottom of pot 13 and is an opening of pot 13 for sending the liquid to reflux flow path 15 or product flow path 17. Second outlet 22 is an opening of pot 13 for sending the upper layer liquid collected in pot 13 to discharge flow path 16. The specific configuration of pot 13 will be described later.

[0025] In this embodiment, water evaporates as the initial distillate in the distillation column 11. Following the water, a first target liquid (product liquid) that is the target of distillation evaporates. That is, in the early stage of the distillation, there is a time when the distillate contains the first target liquid and water, which is an unnecessary component (unnecessary liquid). Therefore, the target liquid and water are mixed and temporarily stored in the pot 13. The specific gravity of the target liquid is greater than that of water, and the target liquid is separated from water at the interface due to the difference in specific gravity between them. In this embodiment, the target liquid is stored as the lower layer in pot 13, and water is the upper layer. As will be described later, the upper layer water is discharged from second outlet 22 of pot 13 through discharge flow path 16.

[0026] Discharge flow path 16 is formed by piping and is a flow path for discharging a portion of the liquid accumulated in pot 13 as waste liquid. In the present embodiment, water is discharged as waste liquid from pot 13 through discharge flow path 16. The discharged water is received in a tank or the like (not shown).

[0027] Intermediate pipe 14 is a flow path that connects the bottom (first outlet 21) of pot 13 and reflux flow path 15. Intermediate pipe 14 is connected to first outlet 21 of pot 13 and extends downward. The adjusting valve 18 is provided in the intermediate pipe 14 and adjusts the flow rate of the liquid passing through the intermediate pipe 14. The adjusting valve 18 may be manual or electrically operated. The adjusting valve 18 can be fully closed or fully open, and can also be used at intermediate openings. As will be explained later, the height of the interface between the upper and lower liquid layers of the target liquid and water in the pot 13 is adjusted by adjusting the flow rate (opening adjustment) of the adjusting valve 18.

[0028] The reflux flow path 15 is composed of piping and is a flow path for returning the liquid accumulated in the pot 13 to the rectification column 11 as reflux. The reflux flow path 15 has a first reflux pipe 61, a second reflux pipe 62, and a third reflux pipe 63. The first reflux pipe 61 extends with a horizontal component from the lower end 141 of the intermediate pipe 14. The second reflux pipe 62 extends with an upward component from the first reflux pipe 61. The third reflux pipe 63 extends with a horizontal component from the second reflux pipe 62 and connects to the rectification column 11.

[0029] The third reflux pipe 63 is located at a position lower than the upper end 621 of the second reflux pipe 62 or at the same height as the upper end 621. The upper end 621 of the second reflux pipe 62 is located at a position lower than the bottom (first outlet portion 21) of the pot 13. A portion of the liquid flowing through the reflux flow path 15 from the pot 13 via the intermediate pipe 14 accumulates in the first reflux pipe 61 and the second reflux pipe 62.

[0030] Product flow path 17 is composed of piping and is a flow path different from reflux flow path 15. A first flow path branching off from intermediate pipe 14 is reflux flow path 15, and a second flow path branching off from intermediate pipe 14 is product flow path 17. Product flow path 17 is a flow path that allows the liquid (target liquid) accumulated in pot 13 to flow to product container 19A (19B). Product flow path 17 has an on-off valve 171. When on-off valve 171 is closed, the liquid in intermediate pipe 14 flows to reflux flow path 15. When on-off valve 171 is open, the liquid in intermediate pipe 14 can flow to product flow path 17.

[0031] [About Pot 13] 2 is a cross-sectional view of pot 13. Pot 13 has a cylindrical pot body 25 capable of storing liquid. In this embodiment, pot body 25 has a cylindrical side wall 30 with a center line extending in the vertical direction. Pot body 25 has flanges 251 and 252 on the top and bottom. A guide pipe 32, through which introduction pipe 20 passes, is connected to the upper flange 251, and intermediate pipe 14 is connected to the lower flange 252.

[0032] The pot 13 has a first short pipe 28 that protrudes horizontally from the side wall 30 of the pot body 25, and a second short pipe 29 that protrudes horizontally from the pot body 25 in the opposite direction to the first short pipe 28. The second short pipe 29 has a second outlet port 22 that opens horizontally.

[0033] The introduction pipe 20 has an upper and lower pipe section 202 extending in the vertical direction, and a horizontal pipe section 203 extending in the horizontal direction from the lower end of the upper and lower pipe section 202. The introduction pipe 20 has an open end 201 that opens toward a side wall section 31 of the pot 13. In other words, the open end 201 opens in the horizontal direction. The distillate flowing through the introduction pipe 20 is discharged from the open end 201 into the pot body 25. The open end 201 of the introduction pipe 20 opens toward the wall section 31 of the pot 13 on the opposite side in the horizontal direction from the second outlet section 22.

[0034] 3 is a cross-sectional view taken along the line III in FIG. 2. FIG. 4 is a cross-sectional view taken along the line IV in FIG. 2. First short tube 28 has a wall 31, which faces open end 201 of introduction tube 20. In this embodiment, a sight glass (transparent glass) 33 is attached to the end of first short tube 28. This sight glass 33 constitutes wall 31 facing open end 201. The distillate released from open end 201 of introduction tube 20 collides with sight glass 33, falls, and is temporarily collected in pot body 25. The distillate released from open end 201 also collides with sight glass 33, changes direction, and is able to flow toward second outlet 22 (see arrow F in FIG. 4).

[0035] Alternatively, although not shown, if the open end 201 of the input tube 20 is configured to open downward and the distillate released from the open end 201 collides with the liquid surface of the distillate already stored in the pot 13, the collision may result in the generation of a lot of bubbles due to the liquid in the pot 13. However, in the case of this embodiment (see FIG. 4), the distillate collides with the sight glass 33 (wall portion 31) instead of the liquid surface, thereby suppressing the generation of bubbles.

[0036] The pot 13 has a weir 26. The weir 26 is provided inside the pot body 25 and is a member that guides the upper layer liquid (water) to the second outflow section 22. The weir 26 has a pair of opposing guide plates 27 (see FIG. 4). The pair of guide plates 27 extend from the second outflow section 22 side toward the opposite side (first short pipe 28 side) in the horizontal direction to the second outflow section 22. The distance W between the pair of guide plates 27 narrows from the first short pipe 28 side toward the second outflow section 22 side.

[0037] 2 and 3, each guide plate 27 has an intermediate plate portion 271 located midway in the up-down direction, an upper plate portion 272, and a lower plate portion 273. The intermediate plate portion 271 has a side surface shaped along a vertical plane. The distance W between the opposing intermediate plate portions 271 (see FIG. 4) gradually narrows from the sight glass 33 side toward the second outlet portion 22 side.

[0038] The upper plate portion 272 and the lower plate portion 273 each have a slope extending from the middle plate portion 271 toward the side wall 30 of the pot body 25 . 2, an upper end 271u of the intermediate plate portion 271 is located above a top portion 281 of the inner circumferential surface of the first short pipe 28. A lower end 271b of the intermediate plate portion 271 is located below a bottom portion 282 of the inner circumferential surface of the first short pipe 28. The bottom 291 of the inner circumferential surface of the second short pipe 29 is located at a higher position than the bottom 282 of the inner circumferential surface of the first short pipe 28. The top 292 of the inner circumferential surface of the second short pipe 29 is located at the same height as the top 281 of the inner circumferential surface of the first short pipe 28. Note that the top 292 of the inner circumferential surface may be located at a higher position than the top 281 of the inner circumferential surface.

[0039] [Regarding the pressure equalizing pipe 40] The pressure equalizing pipe 40 (see FIG. 1) is a pipe for equalizing the internal pressure of the pot 13 and the reflux flow path 15 with the internal pressure of the vent portion 72 of the condenser 12. The pressure equalizing pipe 40 of this embodiment has a first pipe 41 that connects the upper end 621 of the second reflux pipe 62 to the top of the pot 13, and a second pipe 42 that connects the first pipe 41 to the vent portion 72 (vent pipe 721).

[0040] In this embodiment, the vent section 72 has a pressure reducing pump 722 and is in a negative pressure state where the pressure is reduced below atmospheric pressure. The vent section 72 is connected to the space above the pot 13 and the second reflux pipe 62 (upper end 621) via the pressure equalizing pipe 40 so as to form a single space. Therefore, the space above the pot 13 and the second reflux pipe 62 (upper end 621) are in the same negative pressure state as the vent section 72. As described above, the pressure reducing pump 722 may be omitted. In this case, the vent 72 is at atmospheric pressure, and the pressure in the space above the pot 13 and the second reflux pipe 62 (upper end 621) is also at the same atmospheric pressure as the vent 72.

[0041] [Rectification system 10 of this embodiment] A rectification system 10 having the above configuration (see FIG. 1) comprises a rectification column 11, a condenser 12 that cools the vapor distilled from the rectification column 11, a pot 13 that accumulates the liquid (distillate) liquefied in the condenser 12, a reflux flow path 15, and a discharge flow path 16. The reflux flow path 15 is a flow path for returning the liquid accumulated in the pot 13 to the rectification column 11. The discharge flow path 16 is a flow path for discharging a portion of the liquid (water) accumulated in the pot 13.

[0042] The pot 13 has a first outlet 21 and a second outlet 22. The first outlet 21 is provided at the bottom of the pot 13 and is a section for sending the liquid to the reflux flow path 15. The second outlet 22 is a section for sending the upper layer of water that accumulates in the pot 13 to the discharge flow path 16.

[0043] In the rectification system 10 having the above configuration, the vapor distilled from the rectification column 11 is cooled and liquefied in the condenser 12, and the liquid (distillate) is collected in the pot 13. The distillate contains a target liquid (product liquid) that is the target of the distillation, and water (unwanted liquid), which is an unwanted component. Therefore, the target liquid and water are mixed and collected in the pot 13. Due to the difference in specific gravity between the target liquid and the water, the target liquid and the water are separated at the interface. The target liquid, which becomes the lower layer liquid in pot 13, is sent out from first outlet 21 and is able to flow through reflux flow path 15 (or product flow path 17). Water, which becomes the upper layer liquid in pot 13, is sent out from second outlet 22 and is able to flow through discharge flow path 16.

[0044] In the case of the rectification system 10 of this embodiment (see FIG. 2), the pot 13 has a cylindrical pot body 25, a first short tube 28 protruding horizontally from the pot body 25, and a second short tube 29 protruding horizontally from the pot body 25 in the opposite direction to the first short tube 28. The first short tube 28 has a wall portion 31 (sight glass 33) facing the open end 201 of the introduction tube 20. The second short tube 29 has a second outlet portion 22 that opens horizontally. Since first short tube 28 has wall 31 (sight glass 33) facing open end 201 of input tube 20, the liquid that flows out from open end 201 and hits wall 31 is collected in pot body 25.

[0045] At the beginning of rectification, the distillate is entirely water, but later the distillate contains the target liquid in addition to water, and the proportion of the target liquid gradually increases until the distillate is entirely made up of the target liquid. When the distillate contains the target liquid, the target liquid accumulates as a lower layer in pot 13, and water accumulates as an upper layer, forming an interface between the target liquid and water. When the distillate begins to contain the target liquid, the opening of the adjusting valve 18 (see FIG. 1) below the pot 13 is reduced to reduce the flow rate in the intermediate pipe 14. This causes the interface between the target liquid in the lower layer and the water in the upper layer to rise.

[0046] 5, the bottom 291 of the inner periphery of the second short tube 29 is located higher than the bottom 282 of the inner periphery of the first short tube 28. The lower-layer target liquid L2 is accumulated in the pot 13 until the interface K between the upper and lower liquid layers reaches the height of the bottom 291 of the inner periphery of the second short tube 29. Of the upper-layer water L1, the water located higher than the bottom 291 of the inner periphery of the second short tube 29 overflows and is sent to the discharge flow path 16 through the second outlet portion 22 of the second short tube 29.

[0047] When the interface K reaches the height position of the inner circumferential bottom 291 of the second short pipe 29, all of the upper layer water (unwanted liquid) L1 can be sent from the pot 13 to the discharge flow path 16 through the second outflow section 22. The flow rate (opening degree) of the adjusting valve 18 (see FIG. 1) is adjusted so that the interface K is at the height position of the inner circumferential bottom 291 of the second short pipe 29. This makes it possible to send all of the upper layer water (L1) from the pot 13 to the discharge flow path 16 through the second outflow part 22.

[0048] In other words, when the interface K coincides with the height of the bottom 291 of the inner periphery of the second short pipe 29, the upper layer of water L1 can be completely discharged from the pot 13. Therefore, the opening of the adjusting valve 18 is adjusted so that the height of the interface K coincides with the height of the bottom 291 of the inner periphery. The pot 13 is capable of completely refluxing the target liquid L2 in the lower layer while allowing the water L1 in the upper layer to overflow and be discharged.

[0049] As the rectification process continues in the rectification column 11 (see FIG. 1), the pressure fluctuates in the condenser 12, the pot 13, and the reflux line 15. The pressure fluctuations cause the height of the interface K (see FIG. 5) between the upper and lower liquid layers stored in the pot 13 to fluctuate. For example, if the pressure in the rectification column 11 and the reflux flow path 15 tends to decrease and the amount of liquid in the pot 13 refluxing to the rectification column 11 through the reflux flow path 15 increases, the interface K between the upper and lower liquid layers in the pot 13 will drop. Thereafter, for example, if the temperature of the rectification column 11 rises, a large amount of distillate is produced, and the pressure in the condenser 12 (cavity 71) tends to rise, the amount of liquid sent from the condenser 12 to the pot 13 will increase, and the interface K will rise. As these states are repeated, the height of the interface K becomes unstable.

[0050] Therefore, the rectification system 10 of this embodiment has a pressure equalizing tube 40. The pressure equalizing tube 40 equalizes the internal pressure of the pot 13 and the reflux passage 15 with the internal pressure of the vent portion 72. The pressure equalizing tube 40 suppresses pressure fluctuations in the condenser 12, the pot 13, and the reflux passage 15, and suppresses fluctuations in the height of the interface K in the pot 13. As described above, the regulating valve 18 regulates the flow rate of the liquid passing through the intermediate pipe 14. The flow rate (opening degree) of the regulating valve 18 is adjusted so that the interface K (see FIG. 5) coincides with the height position of the inner circumferential surface bottom 291 of the second short pipe 29. The equalizing pipe 40 suppresses fluctuations in the height of the interface K, making it easier for the regulating valve 18 to adjust the flow rate.

[0051] In particular, in the present embodiment, the pot 13 has a sight glass 33. An operator can check the height position of the interface K from outside the pot 13 through the sight glass 33. Based on this check, the opening of the adjusting valve 18 is adjusted. The adjusting valve 18 is a manual type, but may also be an electric type. Furthermore, the adjustment of the opening of the adjusting valve 18 may be automated.

[0052] The pot 13 of this embodiment (see FIG. 4) has a cylindrical pot body 25 capable of storing liquid, and a weir 26 provided inside the pot body 25. The weir 26 guides the upper layer of water to the second outflow section 22. The weir 26 enhances the function of discharging water that becomes unnecessary liquid.

[0053] The weir 26 has a pair of opposing guide plates 27, and the distance W between the pair of guide plates 27 narrows toward the second outflow section 22. The water in the upper layer of the pot 13 is guided along the pair of opposing guide plates 27 to the second outflow section 22 (arrow F in FIG. 4). The weir 26 functions as a straightening plate. As the distance W narrows toward the second outflow section 22, the flow rate of the water in the upper layer increases toward the second outflow section 22, facilitating the discharge of water. As described above, the rectification system 10 of this embodiment makes it possible to effectively discharge water, which is an unnecessary liquid in the distillate.

[0054] 〔others〕 The embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of equivalents to the configurations described in the claims. [Explanation of symbols]

[0055] 10. Rectification System 11 Rectification tower 12 Capacitors 13 pot 14 Intermediate piping 15 Reflux channel 16 Discharge flow path 18 Adjusting valve 20 Inlet tube 21 First outlet 22 Second Outlet 25 Pot body 26 Weir 27 Guidance plate 28 First short pipe 29 Second short pipe 30 side wall 31 Wall 40 Pressure equalization pipe 71 Cavity 72 Vent 201 Open end 282 Bottom of inner surface 291 Bottom of inner surface L1 Water (upper layer liquid, unnecessary liquid) L2 Target solution (lower layer) W spacing

Claims

1. A rectification column; a condenser for cooling the vapor distilled from the rectification column; a pot for storing the liquid liquefied by the condenser; a reflux flow path for returning the liquid collected in the pot to the rectification column; a discharge flow path for discharging a portion of the liquid accumulated in the pot; and The pot is a first outlet provided at the bottom of the pot for sending a liquid to the reflux channel; a second outlet for sending the upper layer liquid accumulated in the pot to the discharge flow path; having Rectification system.

2. The pot is a cylindrical pot body capable of storing liquid; a weir provided inside the pot body for guiding the upper layer liquid to the second outflow portion; 2. The rectification system of claim 1, comprising:

3. the weir has a pair of opposing guide plates extending from the second outlet portion toward a side opposite to the second outlet portion in a horizontal direction, The distance between the pair of guide plates narrows toward the second outlet portion.

3. The rectification system of claim 2.

4. a supply pipe for sending liquid from the condenser to the pot; The introduction pipe has an open end that opens toward a wall portion of the pot that is horizontally opposite to the second outflow portion. A rectification system according to any one of claims 1 to 3.

5. an intermediate pipe connecting the first outflow portion and the return flow path; an adjusting valve provided in the intermediate pipe for adjusting the flow rate of the liquid passing through; 4. The rectification system according to claim 1, further comprising:

6. a supply pipe for sending liquid from the condenser to the pot; the introduction pipe has an open end that opens toward a side wall of the pot, The pot is a cylindrical pot body capable of storing liquid; a first short pipe protruding horizontally from the pot body; a second short pipe protruding horizontally from the pot body in a direction opposite to the first short pipe; and the first short pipe has a wall portion facing the open end of the input pipe, The second short pipe has the second outlet portion that opens in a horizontal direction. A rectification system according to any one of claims 1 to 3.

7. 7. The rectification system according to claim 6, wherein the bottom of the inner periphery of the second short tube is located higher than the bottom of the inner periphery of the first short tube.

8. The capacitor has a cavity for receiving a liquefied liquid and a vent portion communicating with the cavity, an input pipe for sending liquid from the cavity to the pot; a pressure equalizing tube for equalizing the internal pressure of the pot and the reflux flow path with the internal pressure of the vent portion, A rectification system according to any one of claims 1 to 3.

Images