A separation process for the production of purified β-pinene

Abstract

The invention relates to the technical field of chemical product distillation, in particular to a separation process for purifying beta-pinene production, comprising starting a feed pump to pump a turpentine mixture into a distillation tower body, and starting a heater in the bottom of the tower to heat the turpentine mixture; alpha-pinene and beta-pinene in the heated turpentine mixture successively reach boiling points and become steam to rise, and are discharged from exhaust holes of a plurality of tower plates to the top of the tower; the upper steam pushes against a sealing member, so that the upper end thereof protrudes out of the exhaust hole and is exhausted, and when the steam rises faster, the lower end of the sealing member is blocked by a limiting part and no longer rises; then the steam enters a condenser along a pipeline at the top of the tower, and becomes liquid under the action of cooling water, and the liquid enters a reflux tank to be collected, and then the product is discharged through a reflux pump; the structure is simple and the gas volume is adjusted to reach a moderate flow rate, so that the gas-liquid two phases have good contact in the tower, that is, the volatile components in the liquid are transferred to the gas phase, thereby achieving a separation effect.

Description

Technical Field

[0001] The invention relates to the technical field of chemical product distillation, in particular to a separation process for purifying beta-pinene production. Background Art

[0002] my country is a major producer of turpentine. The main component of turpentine is α-pinene, followed by β-pinene, which accounts for more than 90% of the components of turpentine. Because β-pinene has an exocyclic double bond, it is more unstable than α-pinene with a bridged ring double bond, and is more prone to oxidation, cracking and other reactions. It is an excellent raw material for synthesizing most mid-range and high-end fragrance intermediates, many pharmaceutical intermediates, and daily chemical fragrances.

[0003] Although α-pinene and β-pinene have almost the same molecular weight, their different molecular structures result in some differences in their physical and chemical properties. For example, the boiling point of α-pinene is about 156°C, while the boiling point of β-pinene is about 164°C to 166°C. Since the boiling points of α-pinene and β-pinene are relatively high and the difference is not very large, they are generally separated by vacuum distillation. Vacuum distillation is to first collect the low-boiling-point α-pinene fraction at the top of the same distillation tower, and finally collect the high-boiling-point β-pinene fraction.

[0004] However, the trays used in the existing distillation tower body have the problem of gas rushing up directly. The heated mixed liquid generates steam that rises from the exhaust holes of the tray and contacts the liquid on the tray. If the ventilation volume of the exhaust holes is not well regulated, the exhaust holes are easily blocked or the exhaust flow is large, which results in interruption of the contact between the gas and the liquid or drives the liquid to the tray above. The existing trays use bubbles and float valves to adjust the exhaust holes. Although each has the advantage of adjusting the gas volume, the bubble structure is complex and the material consumption is large, while the float valve has low mobility and the gas-liquid contact and mixing degree is intense. Therefore, it is necessary to further improve the adjustment of the exhaust holes of the trays. Summary of the invention

[0005] In order to overcome the defects in the prior art, the object of the present invention is to provide a separation process for purifying β-pinene production to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a separation process for purifying β-pinene production, comprising the following steps:

[0007] S1, start the feed pump to pump the turpentine mixture into the distillation tower body, and turn on the heater in the bottom of the tower to heat the turpentine mixture;

[0008] S2. The α-pinene and β-pinene in the heated turpentine mixture reach the boiling point and turn into steam, rising and being discharged to the top of the tower from the exhaust holes of several tower plates;

[0009] S21, the upper row of steam pushes against the sealing member, so that the upper end thereof protrudes out of the exhaust hole for exhaust. Firstly, if the steam rises faster, the lower end of the sealing member is repelled by the magnetic force of the limit frame and no longer rises, that is, the steam will not impact the liquid on the tray and rise;

[0010] S22. Second, if the steam rises faster, the lower end of the sealing member is blocked by the limit pressing sheet and no longer rises, that is, the steam will not impact the liquid on the tray and rush up;

[0011] S23. Thirdly, if the steam rises faster, the lower end of the sealing member is pushed into the exhaust hole to seal it, slowing down the steam from rushing straight through; at the same time, the steam turns around and is discharged downward through the return gas groove on the inner wall of the exhaust hole, and collides with the rising steam to slow it down, that is, the steam will not impact the liquid on the tray and rush up;

[0012] S3, then it goes into the condenser along the pipe at the top of the tower and becomes liquid under the action of cooling water. The liquid then goes into the reflux tank to be collected and then discharged through the reflux pump;

[0013] S4. The liquid in the distillation tower flows to the bottom of the tower along a number of trays under the action of gravity and is discharged;

[0014] S5, the discharged liquid flows to the reboiler through the bottom pipe of the tower, and is converted into gas again under the action of heating steam and refluxed into the distillation tower for recycling;

[0015] The above steps adopt a distillation tower body to separate β-pinene by distillation, wherein one side of the bottom end of the distillation tower body is connected to a feed pump through a pipeline, the top of the distillation tower body is connected to a condenser through a pipeline, the bottom of the condenser is connected to a reflux tank through a pipeline, a reflux pump and a reboiler are arranged below the bottom end of the distillation tower body, the input end of the reflux pump is connected to the reflux tank through a pipeline, and the input end and the output end of the reboiler are respectively connected to the bottom end and the side wall of the distillation tower body through pipelines;

[0016] The inner wall of the distillation tower body is provided with a plurality of tower plates from top to bottom, a downcomer is provided downwardly on one radial side of the tower plate, the downcomers of two adjacent tower plates are relatively staggered, the top surface of the tower plate is provided with a plurality of exhaust holes in a dot matrix with equal intervals, the exhaust holes are of a structure with a small aperture in the middle and a large aperture at both ends, a sealing member is inserted inside the exhaust hole, and a limiting portion is provided at the bottom of the exhaust hole to prevent the sealing member from being completely blocked by the top force of the airflow and to keep the exhaust hole ventilated and not up-rushed.

[0017] As a further improvement of the present technical solution, the limiting part is a limiting frame, which is composed of a pair of parallel rods and a plurality of magnetic blocks. The limiting frame is inserted into the interior of the tower plate and is located on both sides of each row of exhaust holes. The magnetic blocks are embedded in the inner sides of the parallel rods and face the exhaust holes. A magnetic strip is embedded in the lower middle part of the sealing member, and the magnetic strip repels a pair of magnetic blocks on both sides thereof. The limiting frame repels the sealing member through the magnetic force arranged on its inner side, thereby completely blocking the lower port of the exhaust hole due to the top force of the airflow.

[0018] As a further improvement of the present technical solution, the limiting portion is a pair of limiting pressure plates, which are made of spring steel as a thin sheet structure and are L-shaped. The short sides of the limiting pressure plates are bonded to the bottom side wall of the sealing member, and the long sides of the limiting pressure plates are abutted against the inner wall of the lower port of the exhaust hole. The pair of limiting pressure plates act on the sealing member through their rebound force to prevent the sealing member from being subjected to the top force of the airflow and completely blocking the lower port of the exhaust hole.

[0019] As a further improvement of the present technical solution, the limiting portion is a pair of return air grooves, the longitudinal section of the return air groove is L-shaped, and its long groove section passes through the inner wall of the lower port of the exhaust hole, and its short groove section passes through the bottom surface of the tower plate. Each pair of return air grooves discharges the airflow entering the exhaust hole downward by diverting the airflow, and collides with the rising airflow to slow it down.

[0020] As a further improvement of the present technical solution, the lower port of the exhaust hole is a conical hole, the top inner wall of the conical hole is symmetrically provided with through holes, the through holes are aligned with the magnetic block, the top of the exhaust hole is provided with an annular groove outwardly, and a sealing ring is inserted in the annular groove.

[0021] As a further improvement of the present technical solution, the sealing member is a cylinder and a water cover with an enlarged outer diameter is provided at the top end, and a sealing seat with a conical table structure is provided at the bottom end of the sealing member. The diameter of the sealing member is smaller than the inner diameter of the exhaust hole, the top surface of the water cover is a spherical surface and is clamped with the annular groove, and the angle between the side wall and the bottom surface of the sealing seat is smaller than the angle between the inner wall and the bottom surface of the conical hole.

[0022] As a further improvement of the technical solution, the inner wall of the exhaust hole is symmetrically provided with limiting ribs, and the outer wall of the sealing member is symmetrically provided with rectangular limiting strips, and the outer side surface of the limiting rib is a plane and is in sliding contact with the limiting strip.

[0023] As a further improvement of the technical solution, an overflow weir is provided on the top surface of the tower tray and above the downcomer, and the downcomer is a curved tube and is arranged concentrically with the tower tray.

[0024] As a further improvement of the present technical solution, the upper and lower ends of the distillation tower body are connected to each other with a discharge nozzle, the top side of the distillation tower body is connected to each other with a reflux nozzle connected to the output end of a reflux pump, and the middle part and the bottom side wall of the other side of the distillation tower body are respectively connected to each other with a liquid inlet nozzle and a gas return nozzle.

[0025] As a further improvement of the technical solution, a residual liquid pump is connected to one side of the bottom of the distillation tower body, and the input end of the residual liquid pump is connected to the discharge nozzle located below through a pipeline.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The separation process for purifying β-pinene production uses a limiting part set in the tower plate. When the limiting part is a limiting frame, if the steam rises faster, the lower end of the sealing member is repelled by the magnetic force of the limiting frame and no longer rises, that is, the steam will not impact the liquid on the tower plate and rush up; while avoiding the sealing member to completely block the exhaust hole, it also plays a role in slowing down the steam flow rate. The structure is simple and the gas volume is regulated to achieve a moderate flow rate, so that the gas and liquid phases have good contact in the tower, that is, the volatile components in the liquid are transferred to the gas phase, thereby achieving a separation effect.

[0028] 2. The separation process for purifying β-pinene production uses a limiting part set in the tower plate. When the limiting part is a pair of limiting pressing plates, if the steam rises faster, the lower end of the sealing member is blocked by the limiting pressing plate and no longer rises, that is, the steam will not impact the liquid on the tower plate and rush up; while avoiding the sealing member completely blocking the exhaust hole, it also plays a role in slowing down the steam flow rate. The structure is simple and the gas volume is regulated to achieve a moderate flow rate, so that the gas and liquid phases have good contact in the tower, that is, the volatile components in the liquid are transferred to the gas phase, thereby achieving a separation effect.

[0029] 3. The separation process for purifying β-pinene production, through the limiting part set in the tower plate, when the limiting part is a pair of return air grooves, if the steam rises faster, the lower end of the sealing member is pushed into the exhaust hole to seal it, slowing down the situation of steam straightening; at the same time, the steam turns around and discharges downward through the return air groove part of the inner wall of the exhaust hole, and collides with the rising steam to slow it down, that is, the steam will not impact the liquid on the tower plate to rush up; while avoiding the sealing member to completely block the exhaust hole, it also plays a role in slowing down the steam flow rate. The structure is simple and the gas volume is adjusted to reach a moderate flow rate, so that the gas and liquid phases have good contact in the tower, that is, the volatile components in the liquid are transferred to the gas phase, thereby achieving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0031] Figure 1 It is a plan view of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the internal assembly structure of the distillation tower body of the present invention;

[0033] Figure 3 For the present invention Figure 2 The main view;

[0034] Figure 4 This is one of the schematic diagrams of the tower tray assembly structure of the present invention;

[0035] Figure 5 This is a disassembled diagram of the position limiting frame and the hole sealing member of the present invention;

[0036] Figure 6 One of the partial cross-sectional views of the tower tray of the present invention;

[0037] Figure 7 This is the second schematic diagram of the tower tray assembly structure of the present invention;

[0038] Figure 8 This is a disassembled diagram of the position limiting pressing sheet and the hole sealing member of the present invention;

[0039] Fig. 9 For the present invention Figure 7 The main view;

[0040] Fig.10 This is the second partial cross-sectional view of the tower tray of the present invention;

[0041] Fig.11 For the present invention Fig.10 Schematic diagram of the elevation structure.

[0042] The meaning of each number in the figure is:

[0043] 100, distillation tower body; 101, discharge nozzle; 102, liquid inlet nozzle; 103, reflux nozzle; 104, return air nozzle; 110, tower plate; 111, exhaust hole; 1111, tapered hole; 1112, limiting rib; 1113, through hole; 1114, annular groove; 1115, sealing ring; 112, overflow weir; 113, downcomer; 120, feed pump;

[0044] 130, sealing member; 131, water-passing cover; 132, sealing seat; 133, limiting strip;

[0045] 140, limit frame; 141, magnetic block; 142, magnetic strip;

[0046] 150, limit pressing piece; 160, return air groove;

[0047] 200, condenser; 210, reflux tank; 220, reflux pump;

[0048] 300. Reboiler; 310. Residual liquid pump. DETAILED DESCRIPTION

[0049] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as falling within the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0050] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0051] See also Figure 1-Figure 11 As shown, the present invention provides a separation process for purifying β-pinene production, comprising the following steps:

[0052] S1. Start the feed pump 120 to pump the turpentine mixture into the distillation tower body 100, and turn on the heater in the bottom of the tower to heat the turpentine mixture; the main component of turpentine is α-pinene, followed by β-pinene, and the two account for more than 90% of the turpentine components. Because β-pinene has an exocyclic double bond, it is more unstable than α-pinene with a bridging double bond, and is more prone to oxidation, cracking and other reactions; in addition, because the boiling points of α-pinene and β-pinene are relatively high and the difference is not very large, they are generally separated by vacuum distillation;

[0053] S2. The α-pinene and β-pinene in the heated turpentine mixture reach the boiling point and turn into steam and rise, and are discharged to the top of the tower from the exhaust holes 111 of the plurality of trays 110; so that the gas and liquid phases have good contact in the tower, so that the volatile components in the liquid are transferred to the gas phase, thereby achieving the separation effect;

[0054] S21, the upper steam pushes against the sealing member 130, so that the upper end thereof protrudes out of the exhaust hole 111 and exhausts, and the exhaust speed and amount are controlled and adjusted by the sealing member 130; so that the gas forms a honeycomb or foam state in the liquid, and achieves a good gas-liquid two-phase contact, and avoids the gas being too strong to produce a jet state to the liquid, and rushes into the upper tray 110;

[0055] The following are various forms of the limiting part. Equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention. First, if the steam rises faster, the lower end of the sealing member 130 is repelled by the magnetic force of the limiting frame 140 and no longer rises, that is, the steam will not impact the liquid on the tray 110 and rush up; while preventing the sealing member 130 from completely blocking the exhaust hole 111, it also plays a role in slowing down the steam flow rate;

[0056] S22, secondly, if the steam rises faster, the lower end of the sealing member 130 is blocked by the limiting pressing sheet 150 and does not rise any more, that is, the steam will not impact the liquid on the tray 110 and rush up; while preventing the sealing member 130 from completely blocking the exhaust hole 111, it also plays a role in slowing down the steam flow rate;

[0057] S23, thirdly, if the steam rises faster, the lower end of the sealing member 130 is pushed into the exhaust hole 111 to seal it, slowing down the steam from running straight; at the same time, the steam partially turns around and is discharged downward through the return gas groove 160 on the inner wall of the exhaust hole 111, and collides with the rising steam to slow it down, that is, the steam will not impact the liquid on the tray 110 and rush up; while preventing the sealing member 130 from completely blocking the exhaust hole 111, it also plays a role in slowing down the steam flow rate;

[0058] S3, then enter the condenser 200 along the pipe at the top of the tower, and become liquid under the action of cooling water, and then enter the reflux tank 210 to be collected, and then the product is discharged through the reflux pump 220; the temperature in the tower is detected by the temperature detection probe to distinguish whether the steam is α-pinene or β-pinene, and then the collection of the reflux tank 210 is suspended, the previously collected liquid is discharged first, and then the gas condensed water with different temperatures is collected, that is, α-pinene is collected first, and then β-pinene is collected;

[0059] S4, the liquid in the distillation tower body 100 flows to the bottom of the tower along a number of trays 110 under the action of gravity and is discharged;

[0060] S5. The discharged liquid flows into the reboiler 300 through the bottom pipe of the tower, and is converted into gas again under the action of the heating steam and refluxes into the distillation tower body 100 for recycling.

[0061] Specifically, the above steps use a distillation tower body 100 to separate β-pinene by distillation, a feed pump 120 is connected to one side of the bottom end of the distillation tower body 100 through a pipeline, a condenser 200 is connected to the top of the distillation tower body 100 through a pipeline, a reflux tank 210 is connected to the bottom of the condenser 200 through a pipeline, a reflux pump 220 and a reboiler 300 are arranged below the bottom end of the distillation tower body 100, an input end of the reflux pump 220 is connected to the reflux tank 210 through a pipeline, and an input end and an output end of the reboiler 300 are respectively connected to the bottom end and the side wall of the distillation tower body 100 through pipelines;

[0062] The upper and lower ends of the distillation tower body 100 are connected to a discharge nozzle 101, and the top side of the distillation tower body 100 is connected to a reflux nozzle 103 connected to the output end of the reflux pump 220, so as to reflux part of the condensed liquid into the distillation tower body 100 to further separate and purify β-pinene; the middle part and the bottom side wall of the other side of the distillation tower body 100 are respectively connected to a liquid inlet nozzle 102 and a gas return nozzle 104; the liquid inlet nozzle 102 is connected to the output end of the feed pump 120 through a pipeline, and the gas return nozzle 104 is connected to the output end of the reboiler 300 through a pipeline;

[0063] A residual liquid pump 310 is provided at one side of the bottom of the distillation tower body 100 . The input end of the residual liquid pump 310 is connected to the discharge nozzle 101 located below through a pipeline to pump out the residual liquid at the bottom of the tower body.

[0064] Specifically, the inner wall of the distillation tower body 100 is provided with a plurality of trays 110 from top to bottom, which are used to guide the mixed liquid to descend layer by layer and make good contact with the rising steam, so that the volatile components in the liquid are transferred to the gas phase, thereby achieving a separation effect; a downcomer 113 is provided downwardly on one radial side of the tray 110, which is used to guide the liquid on the tray 110 to flow down; the downcomers 113 of two adjacent trays 110 are relatively staggered, so that the liquid flows down layer by layer on the plurality of trays 110 and fully contacts with the rising gas;

[0065] The top surface of the tower plate 110 is provided with a plurality of exhaust holes 111 at equal intervals in a dot matrix. The exhaust holes 111 are of a structure with a small aperture in the middle and large apertures at both ends. A sealing member 130 is inserted into the exhaust hole 111. The structure of the exhaust hole 111 is used to support the sealing member 130 to form a blocked state so that the liquid on the tower plate 110 can flow. When the gas rises, the sealing member 130 is pushed open and escapes from the gap of the exhaust hole 111. A limiting portion is provided at the bottom of the exhaust hole 111 to prevent the sealing member 130 from being completely blocked by the top force of the air flow and to keep the exhaust hole 111 ventilated and not rushing up.

[0066] An overflow weir 112 is provided on the top surface of the tower plate 110 and above the downcomer 113 to block a portion of the liquid so that it can come into contact and react with the rising gas; the downcomer 113 is a curved tube and is arranged cocentrically with the tower plate 110 so that the downcomer 113 is in sealed contact with the tower wall to avoid liquid seepage.

[0067] Further, such as Figure 4-Figure 6 As shown, the limiting part is a limiting frame 140, which is composed of a pair of parallel rods and a plurality of magnetic blocks 141. The limiting frame 140 is inserted into the interior of the tower plate 110 and is located on both sides of each row of a plurality of exhaust holes 111. The limiting frame 140 is inserted from the side of the tower plate 110 away from the downcomer 113; the magnetic blocks 141 are embedded in the inner side of the parallel rods and face the exhaust holes 111, and a magnetic strip 142 is embedded in the lower middle part of the sealing member 130. The magnetic strip 142 repels the pair of magnetic blocks 141 on both sides thereof. The limiting frame 140 repels the sealing member 130 through the magnetic force arranged on its inner side, and the lower end of the exhaust hole 111 is completely blocked by the top force of the airflow.

[0068] Further, such as Figure 7-Figure 9 As shown, the limiting portion is a pair of limiting pressure plates 150, which are made of spring steel thin sheet structure and are L-shaped. The short side of the limiting pressure plate 150 is bonded to the bottom side wall of the sealing member 130, and the long side of the limiting pressure plate 150 is abutted against the inner wall of the lower port of the exhaust hole 111. The pair of limiting pressure plates 150 act on the sealing member 130 through their rebound force to prevent the sealing member 130 from being completely blocked by the airflow pressure.

[0069] Further, such as Fig.10 and Fig.11 As shown, the limiting portion is a pair of return air grooves 160, the longitudinal section of the return air groove 160 is L-shaped, and its long groove section passes through the inner wall of the lower port of the exhaust hole 111, and its short groove section passes through the bottom surface of the tower plate 110. Each pair of return air grooves 160 discharges the air flow entering the exhaust hole 111 downward by diverting the air flow, and collides with the rising air flow to slow it down.

[0070] Specifically, the lower end of the exhaust hole 111 is a conical hole 1111, and the top inner wall of the conical hole 1111 is symmetrically provided with through holes 1113, and the through holes 1113 are aligned with the magnetic block 141 so as to interact with the magnetic strip through magnetic force; an annular groove 1114 is opened outward from the top of the exhaust hole 111, and a sealing ring 1115 is inserted in the annular groove 1114 to seal the top of the sealing member 130 and the top of the exhaust hole 111 to prevent liquid from seeping in.

[0071] Furthermore, the sealing member 130 is a cylinder and has a water cover 131 with an enlarged outer diameter at the top, and a sealing seat 132 with a conical structure at the bottom of the sealing member 130. The diameter of the sealing member 130 is smaller than the inner diameter of the exhaust hole 111 so that the gas can rise from this gap; the top surface of the water cover 131 is a spherical surface and is engaged with the annular groove 1114, and its spherical surface is conducive to liquid circulation; the angle between the side wall and the bottom surface of the sealing seat 132 is smaller than the angle between the inner wall and the bottom surface of the conical hole 1111, so that when the sealing member 130 is pushed up by the gas, the sealing seat 132 and the conical hole 1111 gradually approach each other and reduce the gap between them, thereby achieving the effect of controlling the airflow.

[0072] It is worth noting that the inner wall of the exhaust hole 111 is symmetrically provided with limiting ribs 1112, and the outer wall of the sealing member 130 is symmetrically provided with limiting strips 133 in the form of rectangular strips. The outer side surface of the limiting ribs 1112 is flat and in sliding contact with the limiting strips 133, so that the sealing member 130 can make axial lifting and lowering movements in the exhaust hole 111 without rotating, thereby avoiding the mismatch caused by the influence of magnetic force when using the limiting frame 140.

[0073] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A separation process for purifying β-pinene production, comprising the following steps: S1, starting the feed pump (120) to pump the turpentine mixture into the distillation tower body (100), and turning on the heater in the bottom of the tower to heat the turpentine mixture; S2, the α-pinene and β-pinene in the heated turpentine mixture reach the boiling point and turn into steam, rising and being discharged to the top of the tower from the exhaust holes (111) of a plurality of tower plates (110); Features: S21, the steam in the upper row presses against the sealing member (130) so that its upper end protrudes out of the exhaust hole (111) to exhaust. First, if the steam rises faster, the lower end of the sealing member (130) is repelled by the magnetic force of the limiting frame (140) and no longer rises, that is, the steam will not impact the liquid on the tower plate (110) and rush up; S22. Secondly, if the steam rises faster, the lower end of the sealing member (130) is blocked by the limiting pressing sheet (150) and does not rise any further, that is, the steam will not impact the liquid on the tray (110) and cause it to rise; S23. Thirdly, when the steam rises faster, the lower end of the sealing member (130) is pushed into the exhaust hole (111) to seal it, thereby slowing down the steam from flowing straight through. At the same time, the steam turns around and is discharged downward through the return gas groove (160) on the inner wall of the exhaust hole (111), and collides with the rising steam to slow it down, that is, the steam will not impact the liquid on the tray (110) and rush up. S3, then enters the condenser (200) along the pipe at the top of the tower, and becomes liquid under the action of cooling water, and the liquid enters the reflux tank (210) to be collected, and then discharged as a product through the reflux pump (220); S4. The liquid in the distillation tower body (100) flows to the bottom of the tower along a plurality of tower trays (110) under the action of gravity and is discharged; S5, the discharged liquid flows to the reboiler (300) through the bottom pipeline of the tower, and is converted into gas again under the action of heating steam and refluxed into the distillation tower body (100) for recycling; In the above step, a distillation tower body (100) is used to distill and separate β-pinene. A feed pump (120) is connected to one side of the bottom end of the distillation tower body (100) through a pipeline. A condenser (200) is connected to the top of the distillation tower body (100) through a pipeline. A reflux tank (210) is connected to the bottom of the condenser (200) through a pipeline. A reflux pump (220) and a reboiler (300) are arranged below the bottom end of the distillation tower body (100). The input end of the reflux pump (220) is connected to the reflux tank (210) through a pipeline. The input end and the output end of the reboiler (300) are respectively connected to the bottom end and the side wall of the distillation tower body (100) through pipelines. The inner wall of the distillation tower body (100) is provided with a plurality of tower plates (110) from top to bottom, a downcomer (113) is provided on one radial side of the tower plate (110) and downwardly, the downcomers (113) of two adjacent tower plates (110) are arranged in a relatively staggered manner, a plurality of exhaust holes (111) are provided on the top surface of the tower plate (110) in a dot matrix manner at equal intervals, the exhaust holes (111) are of a structure with a small hole diameter in the middle and large hole diameters at both ends, a sealing member (130) is inserted into the exhaust hole (111), and a limiting portion is provided at the bottom of the exhaust hole (111) to prevent the sealing member (130) from being subjected to the top force of the airflow and completely blocking the lower end of the exhaust hole (111), thereby keeping the exhaust hole (111) ventilated and not overshooting; The limiting part is a limiting frame (140), which is composed of a pair of parallel rods and a plurality of magnetic blocks (141). The limiting frame (140) is inserted into the interior of the tower plate (110) and is located on both sides of each row of a plurality of exhaust holes (111). The magnetic blocks (141) are embedded in the inner sides of the parallel rods and face the exhaust holes (111). A magnetic strip (142) is embedded in the lower middle part of the sealing member (130). The magnetic strip (142) repels the pair of magnetic blocks (141) on both sides thereof. The limiting frame (140) repels the sealing member (130) through the magnetic force arranged on its inner side, and the sealing member (130) is subjected to the top force of the airflow and completely blocks the lower end of the exhaust hole (111). The limiting portion is a pair of limiting pressing pieces (150), the limiting pressing pieces (150) are made of spring steel and are of an L-shaped thin sheet structure, the short sides of the limiting pressing pieces (150) are bonded to the bottom side wall of the hole sealing member (130), and the long sides of the limiting pressing pieces (150) are in contact with the inner wall of the lower end of the exhaust hole (111), and the pair of limiting pressing pieces (150) act on the hole sealing member (130) through their rebound force to prevent the hole sealing member (130) from being subjected to the top force of the airflow and completely blocking the lower end of the exhaust hole (111); The limiting portion is a pair of return air grooves (160), the longitudinal section of the return air grooves (160) is L-shaped, and the long groove section thereof penetrates the inner wall of the lower end of the exhaust hole (111), and the short groove section thereof penetrates the bottom surface of the tower plate (110), and each pair of return air grooves (160) discharges the airflow entering the exhaust hole (111) downward by diverting the airflow, while colliding with the rising airflow to slow it down; The lower end of the exhaust hole (111) is a conical hole (1111), the top inner wall of the conical hole (1111) is symmetrically provided with through holes (1113), the through holes (1113) are aligned with the magnetic block (141), the top of the exhaust hole (111) is provided with an annular groove (1114) facing outwards, and a sealing ring (1115) is inserted into the annular groove (1114); The sealing member (130) is a cylinder and has a water cover (131) with an enlarged outer diameter at its top end. The sealing member (130) has a sealing seat (132) with a conical structure at its bottom end. The diameter of the sealing member (130) is smaller than the inner diameter of the exhaust hole (111). The top surface of the water cover (131) is a spherical surface and is engaged with the annular groove (1114). The angle between the side wall and the bottom surface of the sealing seat (132) is smaller than the angle between the inner wall and the bottom surface of the conical hole (1111).

2. The separation process for purifying β-pinene according to claim 1, characterized in that: The inner wall of the exhaust hole (111) is symmetrically provided with limiting ribs (1112), and the outer wall of the hole sealing member (130) is symmetrically provided with limiting strips (133) in the form of rectangular strips, and the outer side surface of the limiting ribs (1112) is a plane and is in sliding contact with the limiting strips (133).

3. The separation process for purifying β-pinene production according to claim 2, characterized in that: An overflow weir (112) is provided on the top surface of the tower tray (110) and above the downcomer (113); the downcomer (113) is a curved tube and is arranged cocentrically with the tower tray (110).

4. The separation process for purifying β-pinene according to claim 3, characterized in that: The upper and lower ends of the distillation tower body (100) are connected to a discharge nozzle (101), one side of the top of the distillation tower body (100) is connected to a reflux nozzle (103) connected to the output end of a reflux pump (220), and the middle part and bottom side wall of the other side of the distillation tower body (100) are respectively connected to a liquid inlet nozzle (102) and a gas return nozzle (104).

5. The separation process for purifying β-pinene production according to claim 4, characterized in that: A residual liquid pump (310) is provided on one side of the bottom of the distillation tower body (100), and an input end of the residual liquid pump (310) is connected to a discharge nozzle (101) located below through a pipeline.

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