Alkyl pyridine reduced pressure distillation device based on intelligent pressure control

Abstract

The utility model discloses an alkyl pyridine reduced pressure distillation device based on intelligent pressure control, and belongs to the technical field of chemical engineering. The alkylpyridine reduced pressure distillation device based on intelligent pressure control comprises a distillation still and a condensation pipe, a steam outlet is formed in the upper end of the distillation still, during distillation, gas containing alkylpyridine rises and is discharged from the steam outlet, the steam outlet is connected with a spiral pipe through a pipeline, and a negative pressure pipe is arranged on one side of the upper end of the distillation still. According to the alkyl pyridine reduced pressure distillation device based on intelligent pressure control, data are collected through the pressure sensor, the microprocessor analyzes the data and sends an instruction to the vacuum pump and the heater, so that the purpose of accurately controlling the pressure of the distillation kettle is achieved, the front end of the vacuum pump is connected with the pressure reduction box, and steam condensation is accelerated through the condensation plate; and water vapor is filtered through the conical filter screen, pollution of the water vapor to the vacuum pump is avoided, the condensation plate is designed to be of a movable structure, and water drops can be shaken off.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, and more particularly to an alkyl pyridine vacuum distillation device based on pressure intelligent control. Background Art

[0002] Alkylpyridines are a class of organic compounds containing a pyridine ring (a six-membered nitrogen-containing heterocycle) that can exhibit high boiling points and high sensitivity. Distilling these compounds at atmospheric pressure can lead to degradation, so distillation at lower pressures is necessary to reduce their boiling points and avoid thermal decomposition. Traditional vacuum distillation of alkylpyridines, due to a lack of effective pressure control, often results in low product purity, high energy consumption, and safety risks.

[0003] Chinese patent publication number CN220159246U discloses a vacuum distillation apparatus. A vacuum pump cooperates with a negative pressure pipe to draw air containing compounds from a kettle into a filter assembly. Multiple filter plates placed on a baffle can filter the gas entering the chamber. The filtered air enters the vacuum pump without corroding it. However, when producing alkyl pyridine, the filtered water vapor contains the alkyl pyridine product, resulting in product waste. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an alkyl pyridine vacuum distillation device based on pressure intelligent control to solve the above deficiencies.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0006] The utility model discloses an alkylpyridine vacuum distillation device based on pressure intelligent control, comprising a still and a condenser, wherein the upper end of the still is provided with a steam outlet, the steam outlet is connected to a spiral tube through a pipeline, a negative pressure pipe is provided on one side of the upper end of the still, one end of the negative pressure pipe is connected to a vacuum box, the upper end of the vacuum box is connected to a vacuum pump, and a condenser plate is movably connected in the vacuum box.

[0007] Preferably, a curved plate is provided on one side of the decompression box close to the end of the condensation plate, and the curved plate is in contact with one end of the condensation plate.

[0008] Preferably, a coolant pipe is arranged inside the condensation plate, and an air vent is opened on the condensation plate, and a conical filter is fixedly connected to the air vent.

[0009] Preferably, a limit plate is provided at the end of the arc-shaped plate.

[0010] Preferably, the spiral tube passes through the condenser, and the lower end of the spiral tube is connected to a collecting tank.

[0011] Preferably, a temperature measuring rod is provided in the distillation kettle, on which no less than two temperature sensors are provided, a pressure sensor is provided at the upper end of the temperature measuring rod, and a heater is provided on the outer wall of the distillation kettle.

[0012] Preferably, the alkylpyridine vacuum distillation apparatus further comprises a microprocessor, which is electrically connected to the vacuum pump, temperature sensor, pressure sensor and heater, and is configured to receive data from the pressure sensor and control the vacuum pump and heater according to a preset algorithm.

[0013] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0014] The utility model collects data through a pressure sensor, and a microprocessor analyzes and sends instructions to a vacuum pump and a heater to achieve the purpose of accurately controlling the pressure of a distillation kettle. A decompression box is connected to the front end of the vacuum pump, and a condensation plate is used to accelerate steam condensation. Water vapor is filtered through a conical filter to prevent water vapor from contaminating the vacuum pump. The condensation plate is designed to be a movable structure, which can shake off water droplets, and condensed alkyl pyridine can be recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structural diagram of the alkyl pyridine vacuum distillation device based on pressure intelligent control of the utility model;

[0016] Figure 2 It is a partial cross-sectional view of the alkylpyridine vacuum distillation apparatus based on pressure intelligent control of the present invention;

[0017] Figure 3 This is a structural diagram of the decompression box of the present utility model;

[0018] Figure 4 This is a structural diagram of the condensation plate of the present utility model.

[0019] In the figure: 1. Distillation kettle; 11. Steam outlet; 12. Spiral tube; 13. Negative pressure tube; 14. Temperature measuring rod; 141. Temperature sensor; 142. Pressure sensor; 15. Heater; 2. Condenser; 3. Collection tank; 4. Pressure reducing box; 41. Vacuum pump; 42. Condensation plate; 421. Air vent; 422. Conical filter; 43. Curved plate; 431. Limit plate. DETAILED DESCRIPTION

[0020] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] In order to further understand the content of the present application, the present application will be described in detail in combination with the drawings.

[0022] In combination with Figure 1-Figure 4 The alkyl pyridine reduced pressure distillation device based on pressure intelligent control of the present application comprises a distillation kettle 1 and a condenser pipe 2, the upper end of the distillation kettle 1 is provided with a steam outlet 11, during distillation, the gas containing alkyl pyridine rises and is discharged from the steam outlet 11, the steam outlet 11 is connected with a spiral pipe 12 through a pipeline, one side of the upper end of the distillation kettle 1 is provided with a negative pressure pipe 13, one end of the negative pressure pipe 13 is connected with a reduced pressure tank 4, the upper end of the reduced pressure tank 4 is connected with a vacuum pump 41, the vacuum pump 41 works to pump air into the reduced pressure tank 4, negative pressure is generated in the reduced pressure tank 4, the gas in the distillation kettle 1 flows into the reduced pressure tank 4 to reduce the air pressure in the distillation kettle 1, and the reduced pressure tank 4 is movably connected with a condensing plate 42.

[0023] In the present embodiment, the reduced pressure tank 4 is provided with an arc-shaped plate 43 on one side close to the end of the condensing plate 42, the arc-shaped plate 43 is in contact with one end of the condensing plate 42, the position where the condensing plate 42 is in contact with the arc-shaped plate 43 is an arc surface structure, and when the condensing plate 42 rotates, the end of the condensing plate 42 always moves on the arc-shaped plate 43, the arc-shaped plate 43 and the condensing plate 42 can play a sealing role through the contact therebetween, and the movable condensing plate 42 can shake off the condensed water beads.

[0024] In the present embodiment, the inside of the condensing plate 42 is provided with cooling liquid pipelines, the steam meets the condensing plate 42 to accelerate the condensation speed, the condensing plate 42 is provided with air holes 421, the air holes 421 are fixedly connected with conical filter screens 422, the gas passes through the air holes 421, the uncondensed water vapor is intercepted by the conical filter screens 422, and after being collected for a period of time, the water vapor is condensed into water beads and automatically falls.

[0025] In the present embodiment, the end of the arc-shaped plate 43 is provided with a limiting plate 431, the limiting plate 431 limits the rotation angle of the condensing plate 42 to prevent the condensing plate 42 from separating from the arc-shaped plate 43.

[0026] In the present embodiment, the spiral pipe 12 penetrates through the condenser pipe 2, and the lower end of the spiral pipe 12 is connected with a collection tank 3, the cooling and condensation path of the steam is prolonged through the spiral pipe 12 to sufficiently cool and condense the steam, and the condensed water beads are collected in the collection tank 3.

[0027] In this embodiment, the distillation kettle 1 is provided with a temperature measuring rod 14, and the temperature measuring rod 14 is provided with not less than two temperature sensors 141, the temperature at different heights in the distillation kettle 1 is measured by the temperature sensors 141 at different heights, and the upper end of the temperature measuring rod 14 is provided with a pressure sensor 142 for real-time monitoring of the pressure inside the distillation kettle 1, and the outer wall of the distillation kettle 1 is provided with a heater 15, and the heater 15 is used to provide the necessary heat to promote the evaporation of the alkyl pyridine compound.

[0028] In this embodiment, the alkyl pyridine reduced pressure distillation device further comprises a microprocessor, the microprocessor is electrically connected with the vacuum pump 41, the temperature sensor 141, the pressure sensor 142 and the heater 15, and the microprocessor is used to receive the data of the pressure sensor 142 and control the vacuum pump 41 and the heater 15 according to a preset algorithm.

[0029] Working process: the alkyl pyridine sample material is put into the distillation kettle 1 from the upper end of the distillation kettle 1, and impurities are avoided to be introduced, the alkyl pyridine sample material covers the temperature sensor 141 on the temperature measuring rod 14, the vacuum pump 41 is opened, the pressure in the distillation kettle 1 is gradually reduced to the required level, and attention is paid to the reading of the pressure sensor 142 to avoid excessive vacuum, the heater 15 is turned on, and the temperature is slowly increased until the steam starts to rise, once the distillation starts, the microprocessor adjusts the heating speed according to the stability of the steam column and the reading of the pressure gauge, maintains a stable distillation rate, avoids violent boiling, and the steam is condensed through the condenser pipe 2 and recovered in the collection tank 3, in the process, the microprocessor controls the vacuum pump 41 to work according to the real-time monitoring of the pressure inside the distillation kettle 1, a negative pressure is generated in the decompression tank 4 above the condensing plate 42, the steam enters the decompression tank 4, meets the condensing plate 42 and is condensed, the intermittent work of the vacuum pump 41 drives the condensing plate 42 to shake, accelerates the condensation of water droplets, and the uncondensed water vapor is collected by the conical filter screen 422.

[0030] In summary: the alkyl pyridine reduced pressure distillation device based on pressure intelligent control of the utility model, through the pressure sensor 142 collects data, the microprocessor analyzes and sends instructions to the vacuum pump 41 and the heater 15, so as to achieve the purpose of accurately controlling the pressure of the distillation kettle 1, and the decompression tank 4 is connected in front of the vacuum pump 41, the condensing plate 42 is used to accelerate the condensation of steam, and the conical filter screen 422 is used to filter the water vapor, so as to avoid the pollution of the water vapor to the vacuum pump 41, and the condensing plate 42 is designed into a movable structure, can shake off water droplets, and the condensed alkyl pyridine can be recovered.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An alkylpyridine vacuum distillation apparatus based on intelligent pressure control, comprising a still (1) and a condenser (2), characterized in that: The upper end of the distillation kettle (1) is provided with a steam outlet (11), and the steam outlet (11) is connected to a spiral tube (12) through a pipeline. A negative pressure pipe (13) is provided on one side of the upper end of the distillation kettle (1), and one end of the negative pressure pipe (13) is connected to a decompression box (4). The upper end of the decompression box (4) is connected to a vacuum pump (41), and a condensation plate (42) is movably connected inside the decompression box (4); a coolant pipeline is arranged inside the condensation plate (42), and an air vent (421) is opened on the condensation plate (42), and a conical filter (422) is fixedly connected to the air vent (421). A temperature measuring rod (14) is provided in the distillation kettle (1), and no less than two temperature sensors (141) are provided on the temperature measuring rod (14). A pressure sensor (142) is provided at the upper end of the temperature measuring rod (14). A heater (15) is provided on the outer wall of the distillation kettle (1).

2. The alkylpyridine vacuum distillation apparatus based on pressure intelligent control according to claim 1, characterized in that: A curved plate (43) is provided on one side of the decompression box (4) close to the end of the condensation plate (42), and the curved plate (43) is in contact with one end of the condensation plate (42).

3. The alkylpyridine vacuum distillation apparatus based on pressure intelligent control according to claim 2, characterized in that: A limiting plate (431) is provided at the end of the arc-shaped plate (43).

4. The alkylpyridine vacuum distillation apparatus based on pressure intelligent control according to claim 1, characterized in that: The spiral tube (12) passes through the condenser tube (2), and the lower end of the spiral tube (12) is connected to the collecting tank (3).

5. The alkylpyridine vacuum distillation apparatus based on pressure intelligent control according to claim 1, characterized in that: The device further comprises a microprocessor, which is electrically connected to the vacuum pump (41), the temperature sensor (141), the pressure sensor (142) and the heater (15). The microprocessor is used to receive data from the pressure sensor (142) and control the vacuum pump (41) and the heater (15) according to a preset algorithm.

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