A refining apparatus for trans-1,3-dichloropropene

Abstract

This utility model relates to the field of chemical product refining technology, and provides a refining apparatus for trans-1,3-dichloropropylene. The apparatus includes a distillation column body with an anti-clogging mechanism inside, and a pretreatment mechanism at the bottom. The distillation column body includes a jacketed heater, with a reboiler fixedly connected to its bottom. The jacketed heater is fitted onto the upper end of the reboiler, with an oil inlet pipe fixedly connected to its input end and a return oil pipe fixedly connected to its output end. The anti-clogging mechanism includes an insulation pipe, a ring pipe, and a sieve. This technical solution solves the problems in the prior art where high-boiling-point substances adhere to the inner wall of the reboiler and the surface of the guide plates, leading to decreased heat transfer efficiency and increased heating energy consumption to maintain the reboiler temperature; and also causes clogging of the reboiler discharge port and reboiler heat exchange tubes.

Description

Technical Field

[0001] This utility model relates to the field of chemical product refining technology, specifically to a refining apparatus for trans-1,3-dichloropropylene. Background Technology

[0002] Trans-1,3-dichloropropene, an important member of the haloalkene family, possesses a unique chemical configuration where two chlorine atoms are positioned on either side of a double bond. Compared to its cis isomer, trans-1,3-dichloropropene exhibits higher molecular symmetry and a more uniform bond energy distribution, making it less prone to decomposition under ambient temperature and light conditions, thus increasing its chemical stability by over 40%. In the pesticide field, it serves as a key intermediate in thiazole fungicides, enabling the construction of active molecular structures through substitution and cyclization reactions. Its purity directly impacts the final potency of the fungicide. In organic synthesis, its double bond can undergo addition and polymerization reactions, leading to the preparation of specialty plasticizers, flame retardants, and other fine chemicals.

[0003] In existing technologies, high-boiling-point substances are generated during the production of trans-1,3-dichloropropylene. The process of these high-boiling-point substances accumulating in the reboiler to form polymers is gradual and harmful: initially, they adhere to the inner wall of the reboiler and the surface of the guide plates in the form of viscous sludge, resulting in a 15% to 20% decrease in heat transfer efficiency, requiring increased heating energy consumption to maintain the reboiler temperature; as the operating time increases, the sludge gradually polymerizes into a solid resinous substance, which will block the reboiler discharge port and the heat exchange tubes of the reboiler. Utility Model Content

[0004] To overcome the above-mentioned defects, this utility model provides a refining apparatus for trans-1,3-dichloropropene, which solves the technical problems in the prior art where high-boiling substances adhere to the inner wall of the column bottom and the surface of the guide plate, resulting in a decrease in heat transfer efficiency and an increase in heating energy consumption to maintain the column bottom temperature; and also causes blockage of the column bottom discharge port and reboiler heat exchange tubes.

[0005] According to one aspect, at least one embodiment of the present invention provides a refining apparatus for trans-1,3-dichloropropene, comprising:

[0006] The main body of the distillation column is equipped with an anti-clogging mechanism inside, and a pretreatment mechanism is provided at the bottom of the main body of the distillation column.

[0007] The main body of the distillation column includes a jacketed heater. A column reboiler is fixedly connected to the bottom end of the main body of the distillation column. The jacketed heater is sleeved on the upper end of the column reboiler. An oil inlet pipe is fixedly connected to the input end of the jacketed heater, and an oil return pipe is fixedly connected to the output end of the jacketed heater.

[0008] The anti-clogging mechanism includes an insulation pipe, a ring pipe, and a sieve. The input end of the insulation pipe is fixedly connected to the steam discharge pipe located between the condensers at the top of the main body of the distillation column, and the output end of the insulation pipe is fixedly connected to the column bottom.

[0009] For example, in a purification apparatus for trans-1,3-dichloropropylene provided in at least one embodiment of the present invention, the apparatus further includes: a gas-liquid separator fixedly installed at one end of the upper part of the insulation pipe; an electromagnetic pulse valve fixedly installed at the other end of the upper part of the insulation pipe; a check valve fixedly connected to the output end of the insulation pipe; an annular pipe fixedly installed inside the column bottom, the interior of the annular pipe communicating with the interior of the insulation pipe; a gas outlet nozzle fixedly connected to the upper end of the annular pipe; and a sieve fixedly installed inside the main body of the distillation column by bolts and located above the annular pipe.

[0010] For example, in a purification apparatus for trans-1,3-dichloropropylene provided in at least one embodiment of the present invention, the apparatus further includes: a conical bottom provided at the bottom end of the reboiler, and a DC cylinder fixedly connected to the bottom end of the conical bottom.

[0011] For example, in a refining apparatus for trans-1,3-dichloropropene provided in at least one embodiment of the present invention, a manhole is provided on one side of the surface of the tower, and a cover plate is fixedly connected to the manhole by bolts.

[0012] For example, in a refining apparatus for trans-1,3-dichloropropylene provided in at least one embodiment of the present invention, the pretreatment mechanism includes a buffer tank, one end of which is fixedly connected to a feed pipe, and the end of the feed pipe away from the buffer tank is fixedly connected to the bottom of the DC cylinder via a flange.

[0013] For example, in a purification apparatus for trans-1,3-dichloropropylene provided in at least one embodiment of the present invention, a motor is fixedly connected to the other end of the buffer tank, a stirring shaft is fixedly connected to the output shaft of the motor, and an anchor-type stirring paddle is fixedly connected to the upper end of the stirring shaft.

[0014] For example, in a purification apparatus for trans-1,3-dichloropropene provided in at least one embodiment of the present invention, a pressure safety valve is fixedly installed at one end of the top of the buffer tank, and a breather valve is fixedly installed at the other end of the top of the buffer tank.

[0015] For example, in a refining apparatus for trans-1,3-dichloropropylene provided in at least one embodiment of the present invention, the apparatus further includes: a conveying pump fixedly connected to the bottom end of the buffer tank; a suction pipe fixedly connected to the input end of the conveying pump; a end of the conveying pump away from the conveying pump fixedly connected to the center of the bottom end of the buffer tank; a feeding pipe fixedly connected to the output end of the conveying pump; and a feeding pipe fixedly connected to downstream equipment in the refining process at the end of the feeding pipe away from the conveying pump.

[0016] The beneficial effects of the embodiments of this utility model are as follows:

[0017] (1) In this utility model, by setting an anti-clogging mechanism, the high-temperature steam discharged from the top of the main body of the distillation column is diverted to the inside of the column bottom through the heat insulation pipe, and sprayed to the bottom of the screen through the gas outlet nozzle to remove the attached material on the screen and avoid the pressure drop caused by the blockage of the holes; the blocked screen will reduce the liquid flow, affect the stability of the liquid level in the column bottom and the circulation efficiency of the reboiler, and the steam purging ensures continuous flow.

[0018] (2) In this utility model, a pretreatment mechanism is set up to temporarily store high-boiling-point substances in a buffer tank, which avoids the high-boiling-point substances from directly entering the thin-film evaporator and causing unstable feeding, thus ensuring the continuity of the subsequent processing. The motor drives the stirring shaft to rotate, which drives the anchor-type stirring paddle to stir the high-boiling-point substances, which can prevent the high-boiling-point substances from settling and agglomerating in the tank, and ensure that the high-boiling-point substances can be smoothly transported to the thin-film evaporator. The pressure inside the tank is balanced by the pressure safety valve and the breather valve to ensure the safe operation of the equipment. The material is sent into the thin-film evaporator by the conveying pump. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the main structure of the distillation column in the embodiment;

[0022] Figure 3 for Figure 2 A schematic diagram of the internal structure of the tower reactor in the embodiment;

[0023] Figure 4 for Figure 1A schematic diagram of the pretreatment mechanism structure in the embodiment.

[0024] In the diagram: 1. Main body of the distillation column; 11. Bottom of the column; 12. Conical bottom; 13. Straight-through cylinder; 14. Jacketed heater; 15. Oil inlet pipe; 16. Oil return pipe; 17. Manhole; 18. Cover plate; 2. Anti-clogging mechanism; 21. Insulation pipe; 22. Gas-liquid separator; 23. Electromagnetic pulse valve; 24. Check valve; 25. Circular pipe; 26. Gas outlet nozzle; 27. Screen; 3. Pretreatment mechanism; 31. Buffer tank; 32. Feed pipe; 33. Pressure safety valve; 34. Breather valve; 35. Motor; 36. Stirring shaft; 37. Anchor-type stirring paddle; 38. Transfer pump; 39. Extraction pipe; 310. Feeding pipe. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0026] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0027] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] like Figures 1-3 As shown, it illustrates a refining apparatus for trans-1,3-dichloropropene according to an embodiment of the present invention, comprising:

[0032] The main body of the distillation column 1 is equipped with an anti-clogging mechanism 2 inside the main body of the distillation column 1, and a pretreatment mechanism 3 is provided at the bottom of the main body of the distillation column 1.

[0033] The main body of the distillation column 1 includes a jacketed heater 14. The bottom end of the main body of the distillation column 1 is fixedly connected to a column bottom 11. The jacketed heater 14 is sleeved on the upper end of the column bottom 11. The input end of the jacketed heater 14 is fixedly connected to an oil inlet pipe 15, and the output end of the jacketed heater 14 is fixedly connected to an oil return pipe 16.

[0034] The anti-clogging mechanism 2 includes an insulation pipe 21, an annular pipe 25, and a sieve 27. The inlet end of the insulation pipe 21 is fixedly connected to the steam discharge pipe located between the condensers at the top of the distillation column body 1, and the outlet end of the insulation pipe 21 is fixedly connected to the column bottom 11.

[0035] A gas-liquid separator 22 is fixedly installed at one end of the upper part of the insulation pipe 21, and an electromagnetic pulse valve 23 is fixedly installed at the other end of the upper part of the insulation pipe 21. A check valve 24 is fixedly connected to the output end of the insulation pipe 21. An annular pipe 25 is fixedly installed inside the column bottom 11. The inside of the annular pipe 25 is connected to the inside of the insulation pipe 21. An outlet nozzle 26 is fixedly connected to the upper end of the annular pipe 25. A sieve 27 is fixedly installed inside the main body 1 of the distillation column by bolts and is located above the annular pipe 25.

[0036] The bottom of the tower 11 is provided with a conical bottom 12, and a DC cylinder 13 is fixedly connected to the bottom of the conical bottom 12.

[0037] A manhole 17 is provided on one side of the surface of the tower 11, and a cover plate 18 is fixedly connected to the manhole 17 by bolts.

[0038] In some examples, by setting an anti-clogging mechanism 2, high-boiling-point substances are prevented from adhering to the inner wall of the column bottom 11 and the surface of the guide plate or from clogging the discharge port of the column bottom 11 and the heat exchange tube of the reboiler. By setting a sieve 27, particulate matter (≥75μm, corresponding to 200 mesh) in the liquid phase can be filtered, protecting downstream pumps, reboilers and other equipment, distributing the liquid phase flow evenly, avoiding local eddies or composition fluctuations in the column bottom 11, breaking bubbles, and promoting the balance of gas and liquid phases. The mesh size of the sieve 27 is 100 to 200 mesh.

[0039] A portion of the high-temperature steam discharged from the top of the distillation column 1 is guided to the interior of the reboiler 11 through the insulation pipe 21, and sprayed onto the bottom of the sieve 27 through the exhaust nozzle 26 to remove the deposits on the sieve 27 and prevent the pores from becoming clogged, which would cause the pressure drop to increase. A clogged sieve 27 would reduce the liquid flow rate, affecting the stability of the liquid level in the reboiler 11 and the reboiler circulation efficiency. Steam purging ensures continuous flow.

[0040] The gas-liquid separator 22 can remove liquid droplets mixed with steam. The electromagnetic pulse valve 23 and PLC programming control the intermittent steam injection. The optimal injection time is 10 seconds every 4 hours. The check valve 24 can prevent the liquid inside the bottom of the tower 11 from flowing back to the top of the tower.

[0041] By installing a jacketed heater 14 on the outside of the distillation column 11 and injecting external hot oil into the inside of the jacketed heater 14 to heat the distillation column 11, heat is provided to the material inside the distillation column 11, causing the material to reach a boiling state. The resulting rising vapor can fully contact the descending liquid in the main body of the distillation column 1 on the column plate to carry out mass and heat transfer, thereby achieving the separation of different components in the mixture. Continuous heating can also cause some of the trans-1,3-dichloropropene entrained in the high-boiling matter in the distillation column 11 to vaporize and rise, improving the product recovery rate.

[0042] By opening a manhole 17 on the surface of the tower 11 and installing a cover plate 18 above the manhole 17 that is fixed by bolts, it is convenient to maintain or replace the screen 27.

[0043] For example, such as Figure 4 As shown, the pretreatment mechanism 3 includes a buffer tank 31, one end of which is fixedly connected to an inlet pipe 32, and the end of the inlet pipe 32 away from the buffer tank 31 is fixedly connected to the bottom of the DC cylinder 13 through a flange.

[0044] A motor 35 is fixedly connected to the other end of the buffer tank 31. The output shaft of the motor 35 is fixedly connected to the stirring shaft 36. An anchor-type stirring paddle 37 is fixedly connected to the upper end of the stirring shaft 36.

[0045] A pressure safety valve 33 is fixedly installed at one end of the top of the buffer tank 31, and a breather valve 34 is fixedly installed at the other end of the top of the buffer tank 31.

[0046] A conveying pump 38 is fixedly connected to the bottom end of the buffer tank 31. A material extraction pipe 39 is fixedly connected to the input end of the conveying pump 38. The end of the conveying pump 38 away from the conveying pump 38 is fixedly connected to the center of the bottom end of the buffer tank 31. A feeding pipe 310 is fixedly connected to the output end of the conveying pump 38. The end of the feeding pipe 310 away from the conveying pump 38 is fixedly connected to the downstream equipment in the refining process.

[0047] In some examples, a pretreatment mechanism 3 is set up to temporarily store high-boiling-point substances in a buffer tank 31, preventing them from directly entering the thin-film evaporator and causing instability in the feed, thus ensuring the continuity of the subsequent processing. A motor 35 drives the stirring shaft 36 to rotate, which in turn drives the anchor-type stirring paddle 37 to stir the high-boiling-point substances, preventing them from settling and agglomerating in the tank and ensuring that they can be smoothly transported to the thin-film evaporator. A pressure safety valve 33 and a breather valve 34 are used to balance the pressure inside the tank, ensuring the safe operation of the equipment. A transfer pump 38 is used to send the material into the thin-film evaporator.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A refining apparatus for trans-1,3-dichloropropene, characterized in that, include: The main body of the distillation column (1) is provided with an anti-clogging mechanism (2) inside the main body of the distillation column (1) and a pretreatment mechanism (3) is provided at the bottom end of the main body of the distillation column (1). The main body (1) of the distillation column includes a jacketed heater (14). The bottom end of the main body (1) of the distillation column is fixedly connected to a column bottom (11). The jacketed heater (14) is sleeved on the upper end of the column bottom (11). The input end of the jacketed heater (14) is fixedly connected to an oil inlet pipe (15), and the output end of the jacketed heater (14) is fixedly connected to an oil return pipe (16). The anti-clogging mechanism (2) includes a heat-insulating pipe (21), an annular pipe (25) and a sieve (27). The input end of the heat-insulating pipe (21) is fixedly connected to the steam discharge pipe located between the condensers at the top of the main body of the distillation column (1), and the output end of the heat-insulating pipe (21) is fixedly connected to the bottom of the column (11).

2. The refining apparatus for trans-1,3-dichloropropene according to claim 1, characterized in that, A gas-liquid separator (22) is fixedly installed at one end of the upper part of the insulation pipe (21), and an electromagnetic pulse valve (23) is fixedly installed at the other end of the upper part of the insulation pipe (21). A check valve (24) is fixedly connected to the output end of the insulation pipe (21). The annular pipe (25) is fixedly installed inside the column bottom (11). The interior of the annular pipe (25) is connected to the interior of the insulation pipe (21). An outlet nozzle (26) is fixedly connected to the upper end of the annular pipe (25). The sieve (27) is fixedly installed inside the main body of the distillation column (1) by bolts and is located above the annular pipe (25).

3. The refining apparatus for trans-1,3-dichloropropene according to claim 1, characterized in that, The bottom of the tower (11) is provided with a conical bottom (12), and a DC cylinder (13) is fixedly connected to the bottom of the conical bottom (12).

4. The refining apparatus for trans-1,3-dichloropropene according to claim 1, characterized in that, A manhole (17) is provided on one side of the surface of the tower (11), and a cover plate (18) is fixedly connected to the manhole (17) by bolts.

5. The refining apparatus for trans-1,3-dichloropropene according to claim 3, characterized in that, The pretreatment mechanism (3) includes a buffer tank (31), one end of which is fixedly connected to a feed pipe (32), and the end of the feed pipe (32) away from the buffer tank (31) is fixedly connected to the bottom of the DC cylinder (13) through a flange.

6. The refining apparatus for trans-1,3-dichloropropene according to claim 5, characterized in that, The other end of the buffer tank (31) is fixedly connected to a motor (35), the output shaft of the motor (35) is fixedly connected to a stirring shaft (36), and the upper end of the stirring shaft (36) is fixedly connected to an anchor-type stirring paddle (37).

7. The refining apparatus for trans-1,3-dichloropropylene according to claim 6, characterized in that, A pressure safety valve (33) is fixedly installed at one end of the top of the buffer tank (31), and a breather valve (34) is fixedly installed at the other end of the top of the buffer tank (31).

8. The refining apparatus for trans-1,3-dichloropropene according to claim 7, characterized in that, A conveying pump (38) is fixedly connected to the bottom end of the buffer tank (31). A material extraction pipe (39) is fixedly connected to the input end of the conveying pump (38). The end of the conveying pump (38) away from the conveying pump (38) is fixedly connected to the center of the bottom end of the buffer tank (31). A feeding pipe (310) is fixedly connected to the output end of the conveying pump (38). The end of the feeding pipe (310) away from the conveying pump (38) is fixedly connected to the downstream equipment in the refining process.

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