A distillation column with adjustable feed position and method

Abstract

This invention provides a distillation column and method with adjustable feed position, relating to the field of distillation equipment. Addressing the problem of low testing efficiency due to the inconvenience of adjusting the feed inlet during current distillation column testing, the invention incorporates two flexible hoses within the regulating pipe. A sliding plate and a screen are installed on each flexible hose, establishing a distillation inlet between the two flexible hoses. When the pulling assembly moves the sliding plate and screen, the position and spacing of the distillation inlet can be adjusted, thus meeting the need for convenient adjustment of the material feed position when optimizing distillation device parameters and improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of distillation equipment, and more specifically to a distillation column and method with adjustable feed position. Background Technology

[0002] In chemical production, distillation is a crucial step in the purification of chemical substances. In both laboratory and industrial production processes, it is necessary to test and select the optimal parameters of the distillation apparatus, such as accurately locating and determining the feed inlet position required to meet product requirements during the distillation process.

[0003] In traditional distillation, the location of the feed inlet needs to be determined through a lot of tedious calculations and experimental testing. This process is time-consuming. Since the feed inlet also needs to ensure good continuity and good isolation from the outside world, the distillation unit needs to be disassembled and reassembled to adjust the feed inlet position. The entire modification process takes a lot of time and affects efficiency. Chinese patent (publication number: CN211836392U) discloses an adjustable multi-purpose distillation column. Utilizing a modular structure, it allows for adjustments to the feed position and column height as needed when the main column structure is inconvenient. However, the modular design achieves feed position adjustment by setting multiple openable or sealable feed ports on the feed column assembly. This results in a complex column structure, and the feed ports, even when not in operation, affect the column's structural layout, requiring significant modifications to the column structure. Furthermore, the spacing between the vertically arranged feed ports remains fixed, allowing only changes in feed port position at multiple points, but failing to cover the area between adjacent feed ports. This still cannot meet the requirements for optimizing distillation unit parameters, limiting parameter testing and selection, and affecting the operational performance of the distillation unit. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing a distillation column and method with adjustable feed position. Two flexible hoses are installed inside the regulating tube, with a sliding plate and a mesh plate mounted on each hose. This establishes a distillation inlet between the two flexible hoses. When the pulling assembly moves the sliding plate and mesh plate, the position and spacing of the distillation inlet can be adjusted. This satisfies the need for convenient adjustment of the material feed position when optimizing distillation device parameters, thereby improving testing efficiency.

[0005] The first objective of this invention is to provide a distillation column with adjustable feed position, employing the following scheme:

[0006] The system includes a column body and a distillation column installed within the column body. An regulating tube is installed along the axis of the distillation column, with an orifice plate on its sidewall and an annular working area on its exterior. Two flexible hoses are arranged sequentially along the axis within the regulating tube. The sidewalls of the flexible hoses are fitted against the inner wall of the orifice plate to seal the orifice plate at the fitting position. An annular distillation inlet is formed between the two flexible hoses. One end of one flexible hose near the distillation inlet is sealed by a sliding plate, while the other end of the flexible hose near the distillation inlet is fitted with a mesh plate. A pulling assembly connects the sliding plate and the mesh plate, enabling the pulling assembly to move the sliding plate and the mesh plate to adjust the position of the distillation inlet.

[0007] Furthermore, the other end of the elastic hose connecting the slide plate extends to one end of the adjusting tube and is fixed, and the other end of the elastic hose connecting the mesh plate extends to the other end of the adjusting tube and is fixed. The pulling assembly drives the slide plate and the mesh plate to move axially to adjust the distance between the slide plate and the mesh plate and / or the position of the adjustment tube.

[0008] Furthermore, the mesh plate and the slide plate are connected by a connecting rod and are synchronously driven by the traction component.

[0009] Furthermore, a feed channel is formed inside the elastic hose connected to the mesh plate, and the feed channel passes through the mesh plate and connects to the distillation inlet.

[0010] Furthermore, the traction assembly includes a drive unit and a drum. A flexible cable is wound on the drum. One end of the flexible cable released from the drum is connected to a slide plate or a mesh plate. The output end of the drive unit is connected to the drum. When the drum is driven by the drive unit, the flexible cable drives the slide plate or mesh plate to move axially along the adjusting tube.

[0011] Furthermore, the slide plate and the mesh plate are respectively connected to a traction assembly, the drum is located outside the elastic hose, and the flexible cable passes through the elastic hose to connect the slide plate or the mesh plate.

[0012] Furthermore, the elastic hose includes a flexible wall and a spring, with the flexible wall arranged circumferentially around the spring and connected to the spring, so that the elastic hose forms a cylindrical structure.

[0013] Furthermore, axially upward along the distillation column, the working area between the top of the distillation inlet and the top of the working zone forms the rectification section, and the working area between the bottom of the distillation inlet and the bottom of the working zone forms the stripping section.

[0014] A second objective of the present invention is to provide a method of operating a distillation column with an adjustable feed position as described in the first objective, comprising:

[0015] The distillation column is installed in the column body, and the regulating pipe is connected to the material supply pipe, which supplies the material to be distilled into the regulating pipe.

[0016] The material flows in the regulating pipe and is radially fed into the working area from the distillation inlet. The light phase material in the material rises axially in the working area and is distilled out, while the heavy phase material in the material moves axially downward in the working area, thus achieving distillation.

[0017] When adjusting the distillation inlet parameters, the pulling assembly moves the slide plate and / or screen, and the elastic hose extends or compresses, causing the position of the slide plate and / or screen relative to the regulating tube to change, thereby adjusting the position and / or axial length of the distillation inlet.

[0018] After adjusting the distillation inlet parameters, continue distillation until the relative proportions of the substances to be separated meet the set requirements.

[0019] Furthermore, the flexible hose isolates the working area covered by it from the interior of the regulating pipe, allowing material to enter the working area from the distillation inlet.

[0020] Compared with the prior art, the advantages and positive effects of this invention are:

[0021] (1) To address the problem of low testing efficiency caused by the inconvenience of adjusting the feed inlet of the current distillation column, two flexible hoses are installed inside the regulating pipe. Slide plates and screens are installed on the flexible hoses, thereby establishing the distillation inlet of the regulating pipe between the two flexible hoses. When the traction component moves the slide plates and screens, the position and spacing of the distillation inlet can be adjusted, thereby meeting the need to conveniently adjust the material feed position when optimizing the parameters of the distillation unit and improving the testing efficiency.

[0022] (2) The flexible hose is used as the structure of the regulating pipe network plate to block the non-distillation inlet position. It can extend or shorten with the position change of the network plate and slide plate, maintain the isolation between the inside of the regulating pipe and the working area at the non-distillation inlet position, achieve the directional guidance of the material in the regulating pipe, and enable the material to be accurately output from the distillation inlet position to meet the test requirements.

[0023] (3) The screen plate and the slide plate can move together or separately. When they move together, a single traction component can be used to drive them and change their relative position with the regulating tube, thus improving the regulating efficiency. When the screen plate and the slide plate move separately, their relative position can change, so that not only the position of the distillation inlet can be adjusted, but also the axial length of the distillation inlet can be adjusted to meet diverse testing needs.

[0024] (4) The flexible hose adopts a combination of flexible wall and spring. The spring can be compressed or extended according to the position requirements of the slide plate and mesh plate, and can assist the slide plate and mesh plate to reset. The flexible wall can fold with the compression of the spring and unfold with the extension of the spring to meet the requirements of material isolation. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the distillation column with adjustable feed position in Embodiments 1 and 2 of the present invention.

[0027] Figure 2 This is a top view schematic diagram of the distillation column with adjustable feed position in Embodiments 1 and 2 of the present invention.

[0028] Figure 3 This is a schematic diagram of the connection method between the servo motor and the drive shaft in Embodiments 1 and 2 of the present invention.

[0029] Figure 4 This is a schematic diagram of the arrangement of photoelectric sensors on the drive turntable in Embodiments 1 and 2 of the present invention.

[0030] Figure 5 This is a schematic diagram of the distillation column with adjustable feed position in Embodiments 1 and 2 of the present invention during operation.

[0031] Among them, 1. distillation column, 2. regulating tube, 3. orifice plate, 4. magnetic coupling drive, 5. driving component, 6. drum, 7. first elastic hose, 8. flexible cable, 9. slide plate, 10. mesh plate, 11. flexible wall, 12. second elastic hose, 13. distillation inlet, 14. spring. Detailed Implementation

[0032] Example 1

[0033] In a typical embodiment of the present invention, such as Figures 1-5 As shown, a distillation column with adjustable feed position is presented.

[0034] Currently, determining the optimal feed inlet position for distillation columns requires experimentation and testing. However, changing the feed inlet position is inconvenient, and the adjustment range and precision of the feed inlet are insufficient, making it difficult to test a feed inlet position that meets distillation requirements. Therefore, this embodiment provides a distillation column with an adjustable feed position. An adjusting tube 2 is arranged inside the distillation column 1, and two sections of flexible hose with adjustable axial length are installed inside the adjusting tube 2. The distillation inlet 13 formed between the flexible hoses serves as the feed inlet of the distillation column 1. The distillation inlet 13 can change position when the flexible hoses extend or retract, meeting the requirements for feed position testing in the distillation column.

[0035] See Figure 1The adjustable feed position distillation column includes a column body and a distillation column 1 installed within the column body. The distillation column 1 is a columnar structure and can be installed at the desired position within the column body. An regulating pipe 2 is provided along the axis inside the distillation column 1, and the sidewall of the regulating pipe 2 is an orifice plate 3. Figure 2 As shown, the outer part is an annular working area B; the material to be distilled and separated is supplied to one end of the regulating pipe 2 through a pipeline. The perforated plate 3 on the side wall of the regulating pipe 2 allows the material to pass through, so that the material passes radially through the perforated plate 3 on the side wall of the regulating pipe 2 and enters the working area B outside the regulating pipe 2.

[0036] In this embodiment, the working zone B can adopt a tray structure or a packed structure. The material fed into the regulating pipe 2 can pass through the perforated plate 3 to enter the working zone B for rectification and separation. When using a tray structure, mounting holes for installing the regulating pipe 2 are provided on the tray, allowing the regulating pipe 2 to be stably installed in the column body. When using a packed structure, rectification packing is installed in the annular working zone B outside the regulating pipe 2, forming a horizontally annular working zone B.

[0037] In addition, such as Figure 2 As shown, the sidewall of the regulating tube 2 is a closed annular orifice plate 3. The orifice plate 3 has an array of through holes. The size, spacing, and density of the through holes can be configured according to the distillation requirements so that the material can pass through the through holes on the orifice plate 3. The regulating tube 2 can be fixed to the skeleton structure of the distillation column 1 by welding, or it can be detachably installed on the distillation column 1 by fasteners such as bolts and screws.

[0038] like Figure 3 As shown, the regulating pipe 2 is provided with two elastic hoses arranged sequentially along the axial direction. The side wall of the elastic hose is attached to the inner wall of the orifice plate 3 to seal the orifice plate 3 at the attachment position. The elastic hose can extend and retract upward along the axial direction to change the axial length and adjust the area it covers in the orifice plate 3.

[0039] An annular distillation inlet 13 is formed between the two flexible hoses. Since the orifice plate 3 in the area covered by the flexible hose is blocked, the orifice plate 3 at the distillation inlet 13 is not blocked by the flexible hose. Therefore, after the material enters the regulating pipe 2, it flows along the inside of one flexible hose. After flowing to the distillation inlet 13, it passes radially through the orifice plate 3 from the distillation inlet 13 and enters the working area B.

[0040] One end of the flexible hose near the distillation inlet 13 is blocked by a slide plate 9, and the other end of the flexible hose near the distillation inlet 13 is equipped with a mesh plate 10. The slide plate 9 can block the flow of material along the regulating pipe 2, promote the material to be discharged from the distillation inlet 13 into the regulating pipe 2 and enter the working area B. The mesh plate 10 allows the material to pass through. The mesh plate 10 can adopt a hollow frame structure. Its main function is to transmit the driving force applied to the flexible hose by the traction component, so that the flexible hose can be extended or compressed as needed.

[0041] The slide plate 9 and the mesh plate 10 are connected by a traction assembly. The traction assembly can move the slide plate 9 and the mesh plate 10 to adjust the position of the distillation inlet 13. When the traction assembly moves the slide plate 9 to change position, it can compress or stretch the elastic hose connected to the slide plate 9. Similarly, when the mesh plate 10 is moved to change position by the traction assembly, it can compress or stretch the elastic hose connected to the mesh plate 10.

[0042] See Figure 3 Regarding the arrangement of the flexible hose within the regulating pipe 2, the other end of the flexible hose connecting the slide plate 9 extends to one end of the regulating pipe 2 and is fixed. One end of the slide plate 9 is located inside the regulating pipe 2 and is arranged opposite to the mesh plate 10. The other end of the flexible hose connecting the mesh plate 10 extends to the other end of the regulating pipe 2 and is fixed. One end of the mesh plate 10 is located inside the regulating pipe 2 and is arranged opposite to the slide plate 9. The pulling component drives the slide plate 9 and the mesh plate 10 to move axially, which can adjust the distance between the slide plate 9 and the mesh plate 10, and also adjust the position of the slide plate 9 and the mesh plate 10 relative to the regulating pipe 2.

[0043] Specifically, in this embodiment, the two flexible hoses are a first flexible hose 7 and a second flexible hose 12. A slide plate 9 is connected to the first flexible hose 7, and a mesh plate 10 is connected to the second flexible hose 12. A feeding channel A is formed inside the second flexible hose 12. Furthermore, the end of the first flexible hose 7 away from the slide plate 9 is connected to one end of the regulating pipe 2, and the end of the second flexible hose 12 away from the mesh plate 10 is connected to the other end of the regulating pipe 2; as shown... Figure 3 As shown, taking the example of installing a second elastic hose 12 at the lower part of the regulating pipe 2 and a first elastic hose 7 at the upper part of the regulating pipe 2, one end of the first elastic hose 7 is fixed to the top of the regulating pipe 2, and the other end is connected to the slide plate 9. By adjusting the position of the slide plate 9, the length of the first elastic hose 7 along the axial direction can be changed, thereby changing the position of the upper end of the annular distillation inlet 13; one end of the second elastic hose 12 is fixed to the bottom end of the regulating pipe 2, and the other end is connected to the mesh plate 10. By adjusting the position of the mesh plate 10, the length of the second elastic hose 12 along the axial direction can be changed, that is, the length of the feed channel A can be changed, thereby changing the position of the lower end of the annular distillation inlet 13.

[0044] When the first flexible hose 7 extends and the second flexible hose 12 shortens by the same amount, the axial length of the distillation inlet 13 remains unchanged, and the position of the distillation inlet 13 is adjusted to move towards the second flexible hose 12. Conversely, when the second flexible hose 12 extends and the first flexible hose 7 shortens by the same amount, the axial length of the distillation inlet 13 remains unchanged, and the position of the distillation inlet 13 is adjusted to move towards the first flexible hose 7. This allows for adjustment of the position of the distillation inlet 13, meeting the need for precise location of the distillation inlet 13 in laboratory and industrial production processes.

[0045] To ensure that the axial length of the distillation inlet 13 remains constant, the mesh plate 10 and the slide plate 9 can be connected by a connecting rod and synchronously driven by the traction assembly.

[0046] In addition, if the amount of change of the first elastic hose 7 and the second elastic hose 12 is different or the direction of change is inconsistent, the axial length of the distillation inlet 13 will change, thereby changing the axial coverage of the material entering the working area B through the distillation inlet 13. Therefore, in addition to adjusting and testing the position of the distillation inlet 13, the area size of the distillation inlet 13 can also be adjusted.

[0047] In order to change the size of the distillation inlet 13, a pulling assembly can be configured for the screen plate 10 and the slide plate 9 respectively. The corresponding pulling assembly can be used to control the movement of the screen plate 10 and the slide plate 9 respectively, so that the position of the screen plate 10 and the slide plate 9 relative to the regulating tube 2 changes, and the distance between the screen plate 10 and the slide plate 9 can also change.

[0048] like Figure 3 As shown, the traction assembly includes a drive unit 5 and a drum 6. A flexible cable 8 is wound on the drum 6. One end of the flexible cable 8 released from the drum 6 is connected to a slide plate 9 or a mesh plate 10. The output end of the drive unit 5 is connected to the drum 6. When the drum 6 is driven by the drive unit 5, the flexible cable 8 drives the slide plate 9 or the mesh plate 10 to move axially along the regulating tube 2.

[0049] In this embodiment, the driving component 5 can be a motor, such as a servo motor or a stepper motor. The output end of the motor drives the drum 6 to rotate or stop through the magnetic coupling transmission 4. When the drum 6 rotates, it can drive the mesh plate 10 or the slide plate 9 to move through the flexible cable 8. The mesh plate 10 and the slide plate 9 move along the axial direction of the regulating tube 2 under the combined action of the flexible cable 8 and the elastic hose. When the drum 6 stops rotating, the motor can lock to fix the position of the drum 6 and maintain the axial position of the mesh plate 10 and the slide plate 9 relative to the regulating tube 2.

[0050] The slide plate 9 and the mesh plate 10 are each connected to a traction assembly. The drum 6 is located outside the elastic hose. The flexible cable 8 passes through the elastic hose and connects to the slide plate 9 or the mesh plate 10, thereby driving the slide plate 9 and the mesh plate 10 in conjunction with the elastic hose. The flexible cable 8 can be made of stainless steel soft wire rope, etc., which can meet the requirements for strength and temperature.

[0051] like Figure 4 As shown, the flexible hose includes a flexible wall 11 and a spring 14. The flexible wall 11 is arranged circumferentially around the spring 14 and connected to the spring 14, so that the flexible hose forms a cylindrical structure. The flexible wall 11 can be made of flexible cloth that can withstand the temperature inside the distillation column and has good sealing performance, which can prevent the working area B from entering the flexible hose through the orifice plate 3.

[0052] When selecting spring 14, it is necessary to ensure that spring 14 can resist the pressure of the material in the input regulating pipe 2 without displacement, so as to maintain the position of the distillation inlet 13.

[0053] like Figure 5 As shown, on the axial direction of the distillation column 1, the working area B between the top of the distillation inlet 13 and the top of the working area B forms the rectification section, with a height of H1. The working area B between the bottom of the distillation inlet 13 and the bottom of the working area B forms the stripping section, with a height of H2.

[0054] When the material to be distilled, containing substances C and D, enters the second spring 14 hose, it is continuously heated and evaporated upwards along the feed channel A inside the second spring 14 hose. Upon reaching the slide plate 9, the material is blocked from rising. The material to be distilled then enters the working area B of the distillation column 1 radially through the distillation inlet 13. Working area B is either a tray or a packed area. The lighter phase substance C, with its lower boiling point, passes through the rectification section at a height of H1 and is distilled off. The heavier phase substance D, with its higher boiling point, passes through the stripping section at a height of H2 and descends, being collected at the bottom of the distillation column 1.

[0055] To find the most economical position of the distillation inlet 13 and the heights of the rectification section H1 and stripping section H2, the heights of the rectification section H1 and stripping section H2 are changed by controlling the start and stop of the motor and adjusting the rotation of the drum 6 during the distillation process. After the changes are made, a distillation test is conducted to determine the most suitable feed position for the substances to be separated, thereby improving product purity and also enhancing the versatility and economy of the distillation column with adjustable feed position.

[0056] Example 2

[0057] In another typical embodiment of the present invention, such as Figures 1-5 As shown, a method for operating a distillation column with adjustable feed position is given, utilizing a distillation column with adjustable feed position as described in Example 1.

[0058] The distillation column 1 is installed in the column body, and the regulating pipe 2 is connected to the material supply pipe. The material supply pipe supplies the material to be distilled into the regulating pipe 2.

[0059] The material flows in the regulating pipe 2 and is radially fed into the working zone B from the distillation inlet 13. The light phase substances in the material rise upward along the working zone B and are distilled out, while the heavy phase substances in the material move downward along the working zone B, thus realizing distillation.

[0060] When adjusting the parameters of the distillation inlet 13, the pulling assembly drives the slide plate 9 and / or the screen plate 10 to move, and the elastic hose extends or compresses, so that the position of the slide plate 9 and / or the screen plate 10 relative to the regulating tube 2 changes, thereby adjusting the position and / or axial length of the distillation inlet 13.

[0061] After adjusting the distillation inlet parameter 13, continue distillation until the relative proportions of the substances to be separated meet the set requirements.

[0062] The positions of the slide plate 9 and the mesh plate 10 relative to the adjusting tube 2 can be changed by adjusting the pulling component, or the positions of the slide plate 9 and the mesh plate 10 relative to the adjusting tube 2 can be changed simultaneously.

[0063] The flexible hose isolates the working area B and the inside of the regulating pipe 2 at the location it covers, allowing the material to enter the working area B from the distillation inlet 13.

[0064] In this embodiment, a 2-meter-high packing column is set inside the tower as an example, with 316Lθ rings (1cm) as packing material, and the purification of nitrogen vinyl caprolactam is used as an example for illustration.

[0065] Example 1: The mixture to be separated contains 70% vinyl caprolactam, 5% polymerization inhibitor A, and 25% catalyst. First, the mixture is placed in the bottom of a distillation column and heated under vacuum (800 Pa). It is then pumped into the inlet at the lower end of regulating pipe 2 by a diaphragm pump and conveyed through feed channel A. The heights of H2 and H1 are 1 meter, and the reflux ratio is set to 1:1. Samples are taken continuously as distillate is produced. The proportion of vinyl caprolactam is 99.5%. As the content of vinyl caprolactam in the bottom of the column decreases, the position of the distillation inlet 13 is changed, with the height of H2 at 1.2 meters and H1 at 0.8 meters, to continue purification, maintaining the purity of vinyl caprolactam at 99.5%. Continuous monitoring is performed. Once the proportion of vinyl caprolactam in the bottom of the column is below 5%, the material is discharged from the bottom of the column, and a new batch of distillation is carried out.

[0066] Example 2: The mixture to be separated contains 80% vinyl caprolactam, 5% polymerization inhibitor A, and 25% catalyst. First, the mixture is placed in the bottom of a distillation column and heated under vacuum (800 Pa). It is then pumped into the inlet at the lower end of regulating pipe 2 by a diaphragm pump and conveyed through feed channel A. The height of H2 is 0.8 meters, and the height of H1 is 1.2 meters. The reflux ratio is set to 1:1. Samples are taken continuously as distillate is produced. The proportion of vinyl caprolactam is 99.5%. As the content of vinyl caprolactam in the bottom of the column decreases, the position of the distillation inlet 13 is changed, with the heights of H2 and H1 both set to 1 meter. Purification continues, maintaining the purity of vinyl caprolactam at 99.5%. Continuous monitoring is performed. Once the proportion of vinyl caprolactam in the bottom of the column falls below 5%, the material is discharged from the bottom of the column, and a new batch of distillation is carried out.

[0067] Example 3: The substances to be separated contain 90% N-vinylcaprolactam, 5% polymerization inhibitor A, and 5% catalyst. The mixture is first placed in the bottom of a distillation column and heated under vacuum (800 Pa). It is then pumped into the inlet at the lower end of regulating pipe 2 by a diaphragm pump and conveyed through feed channel A. The heights of H2 and H1 are 0.6 meters and 1.4 meters, respectively, with a reflux ratio of 1:1. Samples are taken continuously as distillate is produced. The N-vinylcaprolactam content is 99.5%. As the N-vinylcaprolactam content in the bottom of the column decreases, the position of the distillation inlet 13 is changed, with the heights of H2 and H1 adjusted to 0.8 meters and 1.2 meters, respectively, to continue purification while maintaining the N-vinylcaprolactam purity at 99.5%. Continuous monitoring is performed. Once the N-vinylcaprolactam content in the bottom of the column falls below 5%, the material is discharged from the bottom of the column, and a new batch of distillation is carried out.

[0068] The working method of the distillation column with adjustable feed position in this embodiment can purify a mixture of various boiling points by changing the height of H1 and H2, i.e., the position of the distillation inlet 13, and the distillation temperature.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A distillation column with adjustable feed position, characterized in that, The system includes a column body and a distillation column installed inside the column body. An regulating tube is installed along the axis of the distillation column, with an orifice plate on the sidewall and an annular working area on the outside. Two flexible hoses are arranged sequentially along the axis inside the regulating tube. The sidewalls of the flexible hoses fit against the inner wall of the orifice plate to seal the orifice plate at the fitting position. An annular distillation inlet is formed between the two flexible hoses. One end of one flexible hose near the distillation inlet is sealed by a sliding plate, while the other end of the flexible hose near the distillation inlet is fitted with a mesh plate. A pulling assembly connects the sliding plate and the mesh plate, allowing the pulling assembly to move the sliding plate and the mesh plate to adjust the position of the distillation inlet. The flexible hose includes a flexible wall and a spring. The flexible wall is arranged circumferentially around the spring and connected to the spring, so that the flexible hose forms a cylindrical structure.

2. The distillation column with adjustable feed position as described in claim 1, characterized in that, The other end of the flexible hose connecting the slide plate extends to one end of the adjusting tube and is fixed. The other end of the flexible hose connecting the mesh plate extends to the other end of the adjusting tube and is fixed. The pulling assembly drives the slide plate and the mesh plate to move axially to adjust the distance between the slide plate and the mesh plate and / or the position of the slide plate and the adjusting tube.

3. The distillation column with adjustable feed position as described in claim 2, characterized in that, The elastic hose connected to the mesh plate forms a feeding channel inside, which passes through the mesh plate and connects to the distillation inlet.

4. The distillation column with adjustable feed position as described in claim 1, characterized in that, The traction assembly includes a drive unit and a drum. A flexible cable is wound on the drum. One end of the flexible cable released from the drum is connected to a slide plate or a mesh plate. The output end of the drive unit is connected to the drum. When the drum is driven by the drive unit, the flexible cable drives the slide plate or mesh plate to move axially along the regulating tube.

5. The distillation column with adjustable feed position as described in claim 4, characterized in that, The slide plate and the mesh plate are respectively connected to a traction assembly, the drum is located outside the elastic hose, and the flexible cable passes through the elastic hose to connect the slide plate or the mesh plate.

6. The distillation column with adjustable feed position as described in claim 1, characterized in that, Along the axial direction of the distillation column, the working area between the top of the distillation inlet and the top of the working zone forms the rectification section, and the working area between the bottom of the distillation inlet and the bottom of the working zone forms the stripping section.

7. A method for operating a distillation column with adjustable feed position, utilizing a distillation column with adjustable feed position as described in any one of claims 1-6, characterized in that, include: The distillation column is installed in the column body, and the regulating pipe is connected to the material supply pipe, which supplies the material to be distilled into the regulating pipe. The material flows in the regulating pipe and is radially fed into the working area from the distillation inlet. The light phase material in the material rises axially in the working area and is distilled out, while the heavy phase material in the material moves axially downward in the working area, thus achieving distillation. When adjusting the distillation inlet parameters, the pulling assembly moves the slide plate and / or screen, and the elastic hose extends or compresses, causing the position of the slide plate and / or screen relative to the regulating tube to change, thereby adjusting the position and / or axial length of the distillation inlet. After adjusting the distillation inlet parameters, continue distillation until the relative proportions of the substances to be separated meet the set requirements.

8. The operating method of the distillation column with adjustable feed position as described in claim 7, characterized in that, The flexible hose isolates the working area covered by it from the inside of the regulating pipe, allowing material to enter the working area from the distillation inlet.

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