A high-efficiency distillation tower for organic materials and its use method

Abstract

The present invention discloses an organic material high-efficiency distillation tower and a method for using the same, which belongs to the field of organic chemical separation. The tower body is characterized in that the tower body comprises at least three feed ports, the sieve plates between adjacent feed ports are configured as high-efficiency directional sieve plates, and the multiple feed ports of the tower body are fed simultaneously. The beneficial effects of the present invention are as follows: a fitting sensitive plate is formed between the high-efficiency directional sieve plate at the bottom feed port and the adjacent top high-efficiency directional sieve plate, which continuously corresponds to the vapor and liquid in the tower, thereby ensuring a higher number of pedals in the distillation section and the appropriate number of stripping section pedals, that is, ensuring a lower average molar viscosity of the tower feed liquid, so that the stripping section and the distillation section are relatively fixed, and the distillation effect can be not affected when the feed components fluctuate within a certain range. In this way, when different similar materials are distilled, the distillation tower can be used to achieve better separation without modifying the distillation tower, the feed port or the tower plate.

Description

Technical Field

[0001] The present invention belongs to the field of organic chemical separation, and more particularly relates to a high-efficiency distillation tower for organic materials and a use method thereof. Background Art

[0002] Conventional distillation towers used in existing organic material separations are mostly fed from a single feed port. Changes in feed composition can have a significant impact on the distillation process and even affect the distillation product.

[0003] Existing multi-feed port distillation towers mostly adopt different feed ports to feed different components, and their essence does not deviate from the scope of a single feed port.

[0004] In order to improve the efficiency of the existing distillation towers, measures are often taken from the mass transfer and heat transfer mode. For example, by changing the gas flow rate, that is, the thermal power, the gas-liquid contact mode is maintained in the foam contact state and the jet contact state.

[0005] Existing distillation towers, especially plate towers, mostly adopt conventional float valves, bubble caps and circular hole sieve plates. Their structures are conventionally equipped with overflow weirs, downcomers, etc. Each layer of the tower plate is a place for mass and heat transfer. Summary of the Invention

[0006] To solve the above problems and overcome the deficiencies of the prior art, the present invention provides a high-efficiency distillation tower for organic materials and a method of use, which can effectively solve the problem that conventional distillation towers can only be used for the distillation of one type of organic matter.

[0007] The specific technical solution of the present invention to solve the above technical problems is: a high-efficiency distillation tower for organic materials, comprising a tower body, a discharge port is arranged at the bottom of the tower body, an air outlet is arranged at the top of the tower body, a feed port communicating with the tower body is opened on the side wall of the tower body, and a preset number of sieve plates are arranged in the tower, characterized in that the feed ports include at least 3, and the sieve plates between adjacent feed ports are arranged to be high-efficiency directional sieve plates.

[0008] Furthermore, the tower is provided with a preset number of sieve plates, which is 17-19, and the number of high-efficiency directional sieve plates between the two feed ports is 1-3.

[0009] Furthermore, the high-efficiency directional screen plate includes a screen plate body adapted to the tower body, a preset number of through holes are provided on the end face of the screen plate body in the form of a ring matrix, the outer cover of the through holes is provided with a tent-like protrusion structure, the tent-like protrusion structure is a hollow hemisphere, and a steam outlet is provided on the side wall of the tent-like protrusion structure. A discharge port is also provided on the end face of the screen plate body, and the discharge ports of adjacent screen plate bodies are staggered.

[0010] Furthermore, the air outlets of the tent-like protrusion structure located on the same concentric circle are arranged in a clockwise or counterclockwise direction.

[0011] Furthermore, the air outlets of the tent-like protrusion structures located on different concentric circles have the same opening direction.

[0012] The use of the high-efficiency distillation tower for organic materials includes:

[0013] 1. The multiple feed ports of the tower body are fed simultaneously;

[0014] 2. The liquid enters the next tower plate under the vortex state of the high-efficiency directional sieve plate, and forms a certain reflux effect under the action of the feed port and air pressure. After the vapor-liquid exchange on the tower plates between multiple feed ports, a mixed fitting whole is formed. A fitting sensitive plate is formed between the high-efficiency directional sieve plate at the bottom feed port and the adjacent top high-efficiency directional sieve plate where the vapor and liquid in the tower are continuously corresponding.

[0015] Furthermore, the full tower distillation efficiency of the high-efficiency distillation tower is The calculation method is:

[0016] ……………①

[0017] ………………………………………………… …②

[0018] Refers to the efficiency of the entire tower,

[0019] Refers to the average molar viscosity of the tower feed liquid, mPa·s

[0020] is the molar viscosity of the tower feed material a, mPa·s

[0021] is the molar viscosity of the column feed b substance, mPa·s;

[0022] Furthermore, the steam vortex heat power generated by the high-efficiency directional sieve plate and the gravity combine to generate the plate surface vortex. On the gas-liquid heat exchange tower plate, there are density differences between the feed components and the gas phase components. The corresponding component density can be calculated by looking up the value using the following formula ③ and the corresponding table:

[0023] ………………………………………… ③

[0024] Furthermore, the cyclonic vortex and backflow generated by the high-efficiency directional screen plate will separate media and materials of different phases with different densities, resulting in a better separation effect, as compared with the required centripetal force Fc.

[0025] …………………… ④

[0026] ρ is the density of each component of the feed material, or the density of each phase of the same material.

[0027] ω refers to the angular velocity of the swirl in each phase state of the substance.

[0028] d is the particle diameter of each virtual material component.

[0029] m is the mass of the particles of each virtual material component.

[0030] FC is the centripetal force generated by the centrifugal sedimentation of the material vortex.

[0031] Furthermore, the ratio of light components to heavy components in the feed components is 0.5 to 4.

[0032] The beneficial effects of the present invention are:

[0033] The present invention adopts a method of feeding simultaneously through multiple feed ports, and adopts high-efficiency directional sieve plates in combination with the sieve plates between adjacent feed ports. The liquid enters the next tower plate under the vortex state of the high-efficiency directional sieve plates, and forms a certain reflux effect under the action of the discharge port and air pressure. After the vapor-liquid exchange on the tower plates between the multiple feed ports, a mixed fitting whole is formed, and a fitting sensitive plate is formed between the high-efficiency directional sieve plate located at the bottom feed port and the adjacent top high-efficiency directional sieve plate corresponding to the continuous vapor-liquid phase in the tower; the fitting sensitive plate refers to the vapor-liquid continuous phase in the tower, and at a cross section at the said position, the specific high-efficiency tower plate is matched with the feeding through multiple feed ports, and the fitting sensitive plate does not change with the change of the component ratio.

[0034] The formation of the fitting sensitive plate ensures a higher number of pedals in the distillation section and the appropriate retention section, which means that a lower average molar viscosity of the tower feed liquid is ensured, so that the distillation section and the distillation section are relatively fixed, and the distillation effect will not be affected when the feed components fluctuate within a certain range. In this way, when different similar materials are distilled, the distillation tower can be used to achieve better separation without modifying the distillation tower, the feed port or the tower plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Attachment Figure 1 It is a schematic diagram of the present invention;

[0036] Attachment Figure 2 Schematic diagram of the high-efficiency directional screen plate of the present invention; in the accompanying drawings:

[0037] 1. Tower body, 2. Discharge port, 3. Sight glass, 4. High-efficiency directional sieve plate, 5. Sieve plate, 6. Tower air outlet, 7. Circulation outlet, 8. Circulation inlet, 9. Feed port, 11. Through hole, 12. Sieve plate body, 13. Tent-style protrusion structure, 14. Discharge port, 15. Steam outlet. DETAILED DESCRIPTION

[0038] In the description of the present invention, specific details are provided solely to facilitate a thorough understanding of the embodiments of the present invention. However, those skilled in the art will appreciate that the present invention is not limited to these details. Furthermore, well-known structures and functions have not been described or illustrated in detail to avoid obscuring the key points of the embodiments of the present invention. Those skilled in the art will appreciate the specific meanings of the above terms as used in the present invention.

[0039] Specific implementation of the present invention:

[0040] In order to better understand the present invention, a specific embodiment is used for illustration. It is worth emphasizing that the effects of this embodiment are not substantially different from those of various embodiments within the scope of protection of the present invention, including the respective reagents and the content ratios of the reagents. All of them can achieve the effects described in the present invention and solve the above-mentioned problems. Other combinations are not described here.

[0041] 1. An efficient distillation tower for organic materials, comprising a tower body 1, a discharge port 2 is provided at the bottom of the tower body 1, a tower body air outlet 6 is provided at the top of the tower body 1, a feed port 9 communicating with the interior of the tower body 1 is provided on the side wall of the tower body 1, and a preset number of sieve plates 5 are provided in the tower, characterized in that the feed ports 9 include at least 3, and the sieve plates 5 between adjacent feed ports 9 are configured as efficient directional sieve plates 4.

[0042] As a preferred solution, the tower body 1 is provided with a preset number of sieve plates 5 of 17-19, and the number of high-efficiency directional sieve plates 4 between the two feed ports 9 is 1-3.

[0043] As a preferred embodiment, the high-efficiency directional screen plate 4 includes a screen plate body 12 adapted to the tower body 1, and a preset number of through holes 11 are provided on the end face of the screen plate body 12 in the form of a ring matrix, and the outer cover of the through hole 11 is provided with a tent-like protrusion structure 13, and the tent-like protrusion structure 13 is a hollow hemisphere, and the side wall of the tent-like protrusion structure 13 is provided with an air outlet 15, and a discharge port 14 is also provided on the end face of the screen plate body 12, and the discharge ports 14 of adjacent screen plate bodies 12 are staggered.

[0044] As a preferred solution, the air outlets 15 of the tent-like protruding structures 13 located on the same concentric circle are arranged in a clockwise or counterclockwise direction.

[0045] As a preferred solution, the air outlets 15 of the tent-like protruding structures 13 located on different concentric circles have the same opening direction.

[0046] The use of the high-efficiency distillation tower for organic materials includes:

[0047] 1 Multiple feed ports 9 of the tower body 1 are fed simultaneously;

[0048] 2 The liquid enters the next tray under the vortex state of the high-efficiency directional sieve plate 4, and forms a certain reflux effect under the action of the feed port 14 and the air pressure. After the vapor-liquid exchange on the trays between the multiple feed ports 9, a mixed fitting whole is formed. In the tower, the vapor and liquid continuously correspond to each other and form a fitting sensitive plate between the high-efficiency directional sieve plate 4 located at the bottom feed port 9 and the adjacent top high-efficiency directional sieve plate 4.

[0049] Example 1:

[0050] This example uses a high-efficiency organic material distillation tower and trays. Three feed inlets, upper, middle, and lower, are located 300 mm above the 4th, 6th, and 8th trays, respectively. The two feed inlets are separated by a single high-efficiency tray with the unique structure described herein, with a delta of 10 mm. To verify the effectiveness of the high-efficiency distillation tower, sight glasses were installed at 90° angles to either side of the feed inlet.

[0051] A tower top partial condenser and reboiler, manufactured by Shandong Xuyang Machinery Manufacturing Co., Ltd., with a heat exchange area of ​​160 m2, and a full condenser, manufactured by Jiangsu Xingqiu Graphite Equipment Co., Ltd., with a 60 m2 x 4 area, along with other ancillary equipment and facilities, were installed. A remote temperature transmitter, Wuzhong Instruments PT100 / 0-200°C / 4-20 mA, was installed 300 mm above the third feed inlet.

[0052] This embodiment uses benzene-chlorobenzene mixed component feed, W 苯 %:W 氯化苯 %=3:1, feed rate is 3.75t / h, feed pressure is 0.35mpa. This example adopts atmospheric distillation method, tower pressure is less than 20kPa, and communication is remotely transmitted to DCS control.

[0053] In this embodiment, 0.8 MPa steam is introduced into the shell side of the reboiler to heat the tube side materials, and 0.2 MPa circulating water is used for cooling the top partial condenser and the total condenser, with an inlet water temperature of 27°C and an outlet water temperature of 34°C. The three feed ports are fed simultaneously.

[0054] According to chemical engineering principles, a sensitive plate is a plate in a distillation column where the proportions of the material components on each plate are roughly the same as the proportions of the feed components. This plate is also the first plate to experience a temperature change when the feed composition changes. In this example, a temperature transmitter is used to remotely transmit the temperature to the DCS system, recording the temperature changes at this location to determine the fluctuations in the position of the fitted sensitive plate. During operation, the temperature at this point remained stable at 98°C ± 2°C.

[0055] This embodiment uses the high-efficiency distillation tower, tray, partial condenser, full condenser, reboiler and temperature measuring resistor, and operates through the three feed ports to separate the above materials:

[0056] With the three feed ports, rotating vortices form on the high-efficiency trays. Centripetal force and gravity pull the light components toward the center of the tray, while the heavy components move toward the tray outlet, improving separation efficiency. After stable operation, samples are taken from the top, bottom, third, and tenth trays through the sampling ports to analyze the chlorobenzene and benzene ratios. The benzene content at the top is >99.9%, while the benzene content in the bottom is <0.01%. The average temperatures of the rectifying and stripping sections are calculated. At this average temperature, the μ values ​​of the two components at each temperature are obtained by consulting Appendix 11 of Chemical Engineering Principles. Using equations ① and ②, a high overall tower efficiency of 0.75 is obtained, while the typical rectifying efficiency is 0.4.

[0057] ………………………………………①

[0058] …………②

[0059] Refers to the efficiency of the entire tower,

[0060] Refers to the average molar viscosity of the tower feed liquid, mPa·s

[0061] is the molar viscosity of the tower feed material a, mPa·s

[0062] is the molar viscosity of the column feed b substance, mPa·s;

[0063] The above-mentioned utilization of the combination of thermodynamics and gravity to generate plate surface vortexes mainly refers to the fact that on the vapor-liquid heat exchange tray, in addition to heat exchange, the centrifugal force is also added to enhance the separation effect of light components and heavy components. The densities of benzene and monochlorobenzene at different temperatures are shown in Table 1, and formulas ③ and ④ are obtained; the density of each component at the corresponding position can be calculated by formula ⑤:

[0064] Table 1: Liquid phase density of each component kg / m3

[0065]

[0066] …………………………………………③

[0067] …………………………………………④

[0068] ………………………………………… ⑤

[0069] That is, the top of the tower:

[0070]

[0071] Feed plate:

[0072]

[0073] Average vapor phase density

[0074] Combined with the density calculated by ③, ④, and ⑤ above, assuming that the liquid phase material on the tower plate is a spherical droplet of a certain volume, and the vortex power comes from the heating steam in the tower kettle, when the tower diameter and feed rate are constant, the required centripetal force Fc corresponding to different densities can be calculated according to formula ⑥:

[0075] …………………… ⑥

[0076] Let k = 1 / 6πd3 × r × ω2, then Fc = K × ρ, then ΔFc>223.1K

[0077] ρ is the density of each component of the feed material, or the density of each phase of the same material.

[0078] μ refers to the viscosity of the material in each phase state or the viscosity of each component of the feed material.

[0079] d is the particle diameter of each virtual material component

[0080] m is the mass of the particles of each virtual material component

[0081] FC is the centripetal force generated by the centrifugal sedimentation of material vortex.

[0082] Example 2:

[0083] The equipment preparation and testing procedures were the same as in Example 1, except that during the preparation process, the test material was replaced with a mixture of cyclohexanone and cyclohexanol in a 1:1 ratio. This example employed vacuum distillation, with an internal tower pressure of ≥ -95 kPa. After stable operation, samples of the distillate and bottoms were taken and analyzed, all meeting the separation requirements.

[0084] By checking the operating temperature, it was found that the temperature near the fourth tray was close to the required temperature of the feed component. Its change was consistent with the change of the sensitive plate. In this example, it was considered that the area near the fourth tray was the feed sensitive plate. Referring to the calculation process in Example 1 and the implementation process of this example, the average bottom temperature was 94°C and the average top temperature was 54°C. m The column efficiency for the distillation of a mixture of cyclohexanone and cyclohexanol is calculated to be 0.72. The feed temperature of the ketone column is 80°C, and the corresponding density is calculated to be 133K.

[0085] In order to more intuitively demonstrate the process advantages of the present invention, the present invention uses a high-efficiency organic material distillation tower method and the same process uses an equivalent replacement method for comparison.

[0086] Comparative Example 1:

[0087] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the upper feed port, i.e., the 8th tray, is used for feeding.

[0088] Comparative Example 2:

[0089] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the middle feed port, i.e., the sixth tray, is used for feeding.

[0090] Comparative Example 3:

[0091] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the lower feed port, i.e., the fourth tray, is used for feeding.

[0092] Comparative Example 4:

[0093] The equipment preparation method and test steps are the same as those in Example 1, except that in the preparation process of this example, the high-efficiency tray is replaced with a common tray.

[0094] Table 2: Comparison of distillation effects of different conditions on distillation tower;

[0095]

[0096] Among them: From the data analysis of Table 2, we can know that:

[0097] (1) Example 1 compared with Comparative Example 1:

[0098] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the upper feed port, i.e., the 8th tray, is used for feeding.

[0099] During the implementation of this example, the three-port feed section disappeared, and the section below the feed plate became a stripping section. This resulted in excessive levels of heavy components in the overhead distillate, preventing optimal separation. The reduced feed rate impacted the tower's processing capacity. The temperature transmitter near the fourth tray, used in the device preparation of Example 1, indicated a temperature that did not meet the bubble point feed component temperature of 98°C ± 2°C, fluctuating around 115°C. The overall tower efficiency decreased, and based on the eighth tray being the feed plate, the efficiency was approximately 0.5. The 17-tray configuration no longer met production requirements.

[0100] (2) Example 1 compared with Comparative Example 2:

[0101] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the middle feed port, i.e., the sixth tray, is used for feeding.

[0102] During the implementation of this example, the three-port feed section disappeared, and the section below the feed plate became a stripping section. This resulted in excessive levels of heavy components in the overhead distillate, preventing optimal separation. The reduced feed rate impacted the tower's processing capacity. The temperature transmitter near the fourth tray, used in the device preparation of Example 1, indicated a temperature that did not meet the bubble point feed component temperature of 98°C ± 2°C, fluctuating around 108°C. The overall tower efficiency decreased, and based on the sixth tray being the feed plate, the efficiency was approximately 0.53. The 17-tray configuration no longer met production requirements.

[0103] (3) Example 1 compared with Comparative Example 3:

[0104] The preparation method, test method and test mixed material are the same as those in Example 1, except that in the preparation process of this comparative example, only the lower feed port, i.e., the fourth tray, is used for feeding.

[0105] During the implementation of this example, the three-inlet feed section disappeared, and the stripping section was below the feed plate, which was basically the same as the stripping section set in Example 1. However, the three feed ports were missing and the special high-efficiency tower plates between the three feed ports were missing. The proportion of light components on the fourth feed tower plate was slightly higher than that in Example 1, and the ideal separation effect that the device in Example 1 could achieve could not be achieved. The sampling analysis at the bottom of the tower showed that the light component content was relatively high.

[0106] The temperature transmitter near the fourth tray, used in the apparatus preparation for Example 1 of the present invention, indicated a temperature that did not meet the bubble point feed component temperature of 98°C ± 2°C, fluctuating from 104°C. This reduced the overall tower efficiency, calculated as approximately 0.62, assuming the fourth tray served as the feed tray. Furthermore, the feed rate was reduced when feeding from a single port, impacting the overall tower processing capacity.

[0107] (4) Example 1 compared with Comparative Example 4:

[0108] The equipment preparation method and test steps are the same as those in Example 1, except that in the preparation process of this example, the high-efficiency tray is replaced with a common tray.

[0109] After the feed was stabilized in this case, samples of the distillate and the bottom of the tower were taken and analyzed, and neither met the product quality requirements. By checking the operating temperature, it was found that the temperature near the fourth tray was close to the temperature corresponding to the proportion of conventional feed components, but was much higher than the temperature corresponding to the use of high-efficiency trays, and there was a large fluctuation, ranging from 105°C to 120°C. In this case, the fourth tray, the sixth tray, and the trays near the eighth tray or the improved tray can all be considered feed-sensitive trays.

[0110] The calculation process in Reference Example 1 and the implementation process of this example show that the performance of the 4th, 6th, and 8th trays clearly shows that the entire tower design repeatedly has three different distillation operating lines and stripping operating lines, which makes the mass and heat transfer of the entire tower chaotic. In other words, the feed plate below the 8th tray can be regarded as no feed, and the effect of feeding from three trays is basically the same as that of feeding from the top tray only, or even worse than feeding from the top tray only. When the feed from the 4th and 6th trays is equivalent to that from the 8th tray, the thermal efficiency of the distillation tower reboiler is reduced.

[0111] In summary, the section below the 8th plate corresponding to the upper feed port is the stripping section, and the section above it is the rectifying section. Ordinary plates have no swirl flow and no eddy current separation effect. The feed components on the 8th plate are obviously high in heavy components and low in light components, and the heavy components in the distillation product at the top of the tower will seriously exceed the standard. And according to the above, feeding the 4th and 6th plates is equivalent to reducing the thermal efficiency of the distillation tower, so the thermal power is insufficient, and the light components in the bottom material will also exceed the standard. According to actual sampling analysis: the benzene in the top of the tower contains 22% monochlorobenzene, and the benzene content in the monochlorobenzene in the bottom of the tower is as high as 8%, which is considered unqualified.

[0112] In summary, the present invention adopts a method of feeding simultaneously through multiple feed ports, and adopts high-efficiency directional sieve plates in conjunction with the sieve plates between adjacent feed ports. The liquid enters the next tower plate under the vortex state of the high-efficiency directional sieve plate, and under the action of the discharge port and air pressure, a certain reflux effect is formed. After the vapor-liquid exchange on the tower plate between the multiple feed ports, a mixed fitting whole is formed, and a fitting sensitive plate is formed between the high-efficiency directional sieve plate located at the bottom feed port and the adjacent top high-efficiency directional sieve plate corresponding to the continuous vapor-liquid phase in the tower; the fitting sensitive plate refers to the vapor-liquid continuous phase in the tower, and at a cross section at the said position, the specific high-efficiency tower plate is matched with the feeding through multiple feed ports, and the fitting sensitive plate does not change with the change of the component ratio.

[0113] The formation of the fitting sensitive plate ensures a higher number of pedals in the distillation section and the appropriate retention section, which means that a lower average molar viscosity of the tower feed liquid is ensured, so that the distillation section and the distillation section are relatively fixed, and the distillation effect will not be affected when the feed components fluctuate within a certain range. In this way, when different similar materials are distilled, the distillation tower can be used to achieve better separation without modifying the distillation tower, the feed port or the tower plate.

Claims

1. An organic material efficient distillation tower, comprising a tower body (1), a discharge port (2) being provided at the bottom of the tower body (1), a tower body gas outlet (6) being provided at the top of the tower body (1), a feed port (9) being provided on the side wall of the tower body (1) and communicating with the interior of the tower body (1), and a preset number of sieve plates (5) being provided in the tower body, characterized in that The feed inlets (9) include at least three, and the sieve plates (5) between adjacent feed inlets (9) are configured as high-efficiency directional sieve plates (4); The tower body (1) is provided with a preset number of sieve plates (5), the number of which is 17-19, and the number of high-efficiency directional sieve plates (4) between the two feed ports (9) is 1-3; The high-efficiency directional sieve plate (4) includes a sieve plate body (12) adapted to the tower body (1), a preset number of through holes (11) are provided on the end surface of the sieve plate body (12) in the form of a ring matrix, a tent-type protrusion structure (13) is provided on the outer cover of the through holes (11), the tent-type protrusion structure (13) is a hollow hemisphere, a steam outlet (15) is provided on the side wall of the tent-type protrusion structure (13), and a discharge port (14) is also provided on the end surface of the sieve plate body (12), and the discharge ports (14) of adjacent sieve plate bodies (12) are staggered. The steam outlets (15) of the tent-like protrusion structure (13) located on the same concentric radial direction are arranged in a clockwise or counterclockwise direction; The steam outlets (15) of the tent-like protrusion structures (13) located on different concentric circles have the same opening direction.

2. A method for using a high-efficiency distillation tower for organic materials, comprising: Usage methods include: (1) The multiple feed ports (9) of the tower body (1) are fed simultaneously; (2) The liquid enters the next tower plate under the vortex state of the high-efficiency directional sieve plate (4), and forms a certain reflux effect under the action of the feed port (14) and air pressure. After the vapor-liquid exchange on the tower plates between the multiple feed ports (9), a mixed fitting whole is formed. A fitting sensitive plate is formed between the high-efficiency directional sieve plate (4) at the bottom feed port (9) and the adjacent top high-efficiency directional sieve plate (4) where the vapor and liquid are continuously corresponding in the tower.

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