A continuous rectifying device for benzyltoluene

Abstract

This utility model discloses a continuous benzyltoluene distillation apparatus, including a feed assembly connected to the upper middle part of a distillation column assembly, a reflux condenser connected to the top of the distillation column assembly, and a bottom discharge assembly connected to the bottom of the distillation column assembly. This utility model continuously feeds a benzyltoluene mixture to the distillation column assembly via the feed assembly. The distillation column assembly heats the bottom of the column to vaporize the material. The rising vapor comes into counter-current contact with the liquid phase on the sieve plate inside the column, achieving separation of light and heavy components. The light component vapor at the top of the column enters the reflux condenser and condenses into liquid. Part of the liquid flows back to the top of the distillation column to maintain balance within the column, while the remainder is collected through a collection pipe. The high-purity benzyltoluene in the bottom of the column can be continuously discharged through the bottom discharge assembly. Thus, through the above structure, continuous feeding, separation, and discharging of the benzyltoluene mixture can be achieved, improving purification efficiency and product stability, and adapting to the needs of continuous production.

Description

Technical Field

[0001] This utility model relates to the field of chemical separation equipment technology, specifically a benzyltoluene continuous distillation device. Background Technology

[0002] Benzyltoluene is an important class of aromatic compounds, widely used in heat transfer oils, insulating liquids, chemical intermediates and other fields. Its production process requires the removal of light components (such as unreacted toluene and benzyl chloride) and heavy components (such as polybenzyl substituted products and high-boiling-point impurities) from the raw materials through distillation to obtain high-purity products.

[0003] Existing benzyltoluene distillation units have the following shortcomings: Traditional batch distillation equipment requires frequent feeding, heating, cooling, and discharging operations, resulting in low production efficiency and large batch-to-batch product purity fluctuations, making it difficult to meet the needs of large-scale production; some continuous distillation units have complex structures, often including multi-stage columns, complex thermal integration systems, and precision control systems, which not only have high manufacturing costs but also require highly skilled operators and are difficult to maintain, making them particularly unsuitable for small and medium-sized production enterprises; unreasonable design of separation components (such as packing or trays) in the column can easily lead to uneven material distribution and low mass transfer efficiency, resulting in incomplete separation of light and heavy components and affecting product purity; the feed and reflux systems are inconvenient to adjust, making it difficult to adjust parameters in real time according to the raw material composition, which can easily lead to energy waste or product defects; therefore, it is necessary to design a benzyltoluene continuous distillation unit to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a benzyltoluene continuous distillation apparatus to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a benzyltoluene continuous distillation apparatus, comprising a feed assembly, a distillation column assembly, a condenser-reflux assembly, and a reboiler discharge assembly, wherein the feed assembly is connected to the upper middle part of the distillation column assembly, the condenser-reflux assembly is connected to the top of the distillation column assembly, and the reboiler discharge assembly is connected to the bottom of the distillation column assembly.

[0006] Preferably, the feeding assembly includes a raw material storage tank and a feeding pump. The raw material storage tank is connected to the feeding pump through a first pipe, and the other end of the feeding pump is connected to the upper middle feed port of the distillation column assembly through the first pipe. A first control valve and a flow meter are installed on the first pipe.

[0007] Preferably, the distillation column assembly includes a vertical distillation column and a reboiler. The reboiler is welded to the bottom of the distillation column, and an electric heating jacket is wrapped around the outside of the reboiler. Multiple sets of through-flow sieve plates are installed at intervals along the height direction on the inner wall of the distillation column, and the edges of the sieve plates are sealed to the inner wall of the distillation column.

[0008] Preferably, the condensation reflux assembly includes a condenser and a reflux tank. The top of the distillation column is provided with a gas phase outlet, which is connected to the condenser via a second pipe. The condenser has a shell-and-tube structure and an internal cooling water pipeline. The bottom condensate outlet of the condenser is connected to the reflux tank via a connecting pipe. The bottom pipeline of the reflux tank is divided into two branches. One branch is connected to one end of a reflux pump via a third pipeline, and the other end of the reflux pump is connected to the top reflux port of the distillation column via the third pipeline. A third control valve is installed on the third pipeline. The other branch is a collection pipe, on which a fourth control valve is installed.

[0009] Preferably, the reboiler discharge assembly includes a discharge pipe, which is welded to the bottom of the reboiler, and a second control valve and a sampling valve are sequentially installed on the discharge pipe.

[0010] Preferably, the feed pump is a metering pump and the flow meter is a rotor flow meter.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model continuously feeds a benzyltoluene mixture to a distillation column assembly via a feeding component. The distillation column assembly heats the material in the reboiler to vaporize it. The rising vapor comes into countercurrent contact with the liquid phase on the sieve plate inside the column to separate the light and heavy components. The light component vapor at the top of the column enters a condensation reflux assembly to condense into liquid. Part of the liquid is refluxed back to the top of the distillation column to maintain the balance inside the column, while the remainder is collected through the outlet pipe. The high-purity benzyltoluene in the reboiler is continuously discharged through the reboiler outlet assembly, thereby completing the continuous distillation and purification of benzyltoluene. Thus, through the above structure, continuous feeding, separation, and discharging of the benzyltoluene mixture can be achieved. Through effective separation of light and heavy components and reflux balance control, purification efficiency and product stability are improved, making it suitable for continuous production needs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a bottom view of the present invention;

[0015] Figure 3 This is a side view and a top view of the present invention;

[0016] Figure 4This is a partial sectional view of the distillation column.

[0017] In the diagram: 1. Raw material storage tank, 2. First pipeline, 3. Feed pump, 4. Distillation column, 5. First control valve, 6. Flow meter, 7. Reboiler, 8. Discharge pipe, 9. Second control valve, 10. Sampling valve, 11. Electric heating jacket, 12. Sieve plate, 13. Gas phase outlet, 14. Second pipeline, 15. Condenser, 16. Connecting pipe, 17. Reflux tank, 18. Third pipeline, 19. Reflux pump, 20. Third control valve, 21. Outlet pipe, 22. Fourth control valve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1

[0020] Please refer to Figure 1-4 As shown, this utility model provides a continuous distillation apparatus for benzyltoluene, including a feed assembly, a distillation column assembly, a condenser-reflux assembly, and a bottom discharge assembly. The feed assembly is connected to the upper middle part of the distillation column assembly, the condenser-reflux assembly is connected to the top of the distillation column assembly, and the bottom discharge assembly is connected to the bottom of the distillation column assembly.

[0021] Specifically, during operation, the feed assembly continuously delivers the benzyltoluene mixture to the distillation column assembly. The distillation column assembly heats the material through the reboiler 7, causing it to vaporize. The rising vapor comes into countercurrent contact with the liquid phase on the sieve plate 12 inside the column, achieving separation of light and heavy components. The light component vapor at the top of the column enters the condenser reflux assembly and is condensed into liquid. Part of the liquid is refluxed back to the top of the distillation column 4 to maintain the balance inside the column, while the remainder is collected through the outlet pipe 21. The high-purity benzyltoluene in the reboiler 7 is continuously discharged through the reboiler outlet assembly, thus completing the continuous distillation and purification of benzyltoluene. Through the above structure, continuous feeding, separation, and discharging of the benzyltoluene mixture can be achieved. By effectively separating the light and heavy components and controlling the reflux balance, the purification efficiency and product stability are improved, adapting to the needs of continuous production.

[0022] The feeding assembly includes a raw material storage tank 1 and a feed pump 3. The raw material storage tank 1 is connected to the feed pump 3 through a first pipe 2. The other end of the feed pump 3 is connected to the upper-middle feed inlet of the distillation column assembly through the first pipe 2. A first control valve 5 and a flow meter 6 are installed on the first pipe 2. During operation, the benzyltoluene mixture in the raw material storage tank 1 flows into the feed pump 3 through the first pipe 2. The feed pump 3 provides power to keep the material flowing along the first pipe 2. The first control valve 5 can adjust the feed flow rate, and the flow meter 6 can monitor the feed amount in real time. The material after flow regulation is continuously transported to the upper-middle feed inlet of the distillation column assembly through the first pipe 2, realizing a stable supply of benzyltoluene mixture to the distillation system. Thus, by setting up the system, a continuous and stable supply of benzyltoluene mixture to the distillation system can be achieved, ensuring the feed balance of the distillation process.

[0023] The distillation column assembly includes a vertical distillation column 4 and a reboiler 7. The reboiler 7 is welded to the bottom of the distillation column 4, and an electric heating jacket 11 is wrapped around the outside of the reboiler 7. Multiple sets of through-flow sieve plates 12 are installed at intervals along the height direction on the inner wall of the distillation column 4. The edges of the sieve plates 12 are sealed to the inner wall of the distillation column 4. During operation, the material enters from the upper feed port of the distillation column 4 and falls to the reboiler 7. The electric heating jacket 11 can heat the material in the reboiler 7 to vaporize it. The vapor rises and passes through each layer of through-flow sieve plates 12, and comes into countercurrent contact with the liquid phase on the sieve plates 12 for mass and heat transfer. The light components continuously vaporize and rise to the top of the column, while the heavy components gradually fall to the reboiler 7. Through the repeated separation action of the multiple layers of sieve plates 12, the light and heavy components can be efficiently separated. Therefore, by setting up the system, the light and heavy components can be efficiently separated, improving the distillation efficiency and product purity.

[0024] The reflux condenser assembly includes a condenser 15 and a reflux tank 17. The top of the distillation column 4 has a vapor outlet 13, which is connected to the condenser 15 via a second pipe 14. The condenser 15 is a tubular structure with built-in cooling water piping. The bottom condensate outlet of the condenser 15 is connected to the reflux tank 17 via a connecting pipe 16. The bottom pipe of the reflux tank 17 is divided into two branches. One branch is connected to one end of a reflux pump 19 via a third pipe 18, and the other end of the reflux pump 19 is connected to the top reflux port of the distillation column 4 via the third pipe 18. A third control valve 20 is installed on the third pipe 18. The other branch is a collection pipe 21, on which a fourth control valve 22 is installed. During operation, the light component vapor discharged from the vapor outlet 13 at the top of the distillation column 4 can enter the shell-and-tube condenser 15 through the second pipe 14. After exchanging heat with the coolant in the cooling water pipe, it condenses into liquid. The liquid flows into the reflux tank 17 through the connecting pipe 16. Part of the liquid in the reflux tank 17 is returned to the column through the reflux port at the top of the distillation column 4 via the third pipe 18, powered by the reflux pump 19, and the flow rate is regulated by the third control valve 20. The other part is collected through the collection pipe 21, and the flow rate is controlled by the fourth control valve 22. This realizes the diversion of condensate and the regulation of the reflux ratio in the distillation column. Through this setting, stable reflux and accurate collection can be achieved, ensuring the balance in the distillation column and improving the product separation accuracy.

[0025] The column bottom discharge assembly includes a discharge pipe 8, which is welded to the bottom of the column bottom 7. A second control valve 9 and a sampling valve 10 are installed on the discharge pipe 8 in sequence. The discharge rate of high-purity benzyl toluene in the column bottom 7 can be adjusted by the second control valve 9. The sampling valve 10 can detect the purity of the product in real time, so as to achieve stable discharge and quality monitoring and ensure product consistency.

[0026] Among them, the feed pump 3 is a metering pump and the flow meter 6 is a rotor flow meter. The metering pump can accurately deliver materials and the rotor flow meter can intuitively monitor the flow rate, providing dual protection for the precise control of the feed amount and improving the feed stability and control accuracy of the distillation system.

[0027] Working principle: First, the feed pump 3 is started. Under the power of the feed pump 3, the benzyltoluene mixture in the raw material storage tank 1 can be continuously transported to the upper feed inlet of the distillation column 4 through the first pipeline 2. After entering, the material falls to the bottom 7 of the column. The electric heating jacket 11 on the outside of the bottom 7 can heat the material to vaporize it. The vapor rises and passes through the multi-layer through-flow sieve plate 12 in the distillation column 4, and makes counter-current contact with the liquid phase on the sieve plate 12 for mass and heat transfer, realizing the separation of light and heavy components. The light component vapor at the top of the column enters the shell and tube condenser 15 through the gas phase outlet 13 and the second pipeline 14, and is cooled by the built-in cooling water pipeline. After heat exchange, the liquid condenses into a liquid and flows into the reflux tank 17 through the connecting pipe 16. Part of the liquid in the reflux tank 17 returns to the top of the distillation column 4 through the third pipe 18 and the third control valve 20, under the power of the reflux pump 19. The other part is collected through the collection pipe 21 and the flow rate is controlled by the fourth control valve 22. At the same time, the high-purity benzyltoluene in the column bottom 7 can be discharged through the discharge pipe 8 and the discharge rate is regulated by the second control valve 9. With the sampling valve 10 to detect the purity in real time, the product is continuously discharged, thus completing the continuous distillation and purification process of benzyltoluene and the entire operation process.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous distillation apparatus for benzyltoluene, comprising a feed assembly, a distillation column assembly, a reflux condenser assembly, and a bottoms discharge assembly, characterized in that: The feed assembly is connected to the upper middle part of the distillation column assembly, the condensation reflux assembly is connected to the top of the distillation column assembly, and the bottom discharge assembly is connected to the bottom of the distillation column assembly.

2. The benzyltoluene continuous distillation apparatus according to claim 1, characterized in that: The feeding assembly includes a raw material storage tank (1) and a feed pump (3). The raw material storage tank (1) is connected to the feed pump (3) through a first pipe (2). The other end of the feed pump (3) is connected to the upper middle feed port of the distillation column assembly through the first pipe (2). A first control valve (5) and a flow meter (6) are installed on the first pipe (2).

3. The benzyltoluene continuous distillation apparatus according to claim 2, characterized in that: The distillation column assembly includes a vertical distillation column (4) and a reboiler (7). The reboiler (7) is welded to the bottom of the distillation column (4). An electric heating jacket (11) is wrapped around the outside of the reboiler (7). Multiple sets of through-flow sieve plates (12) are installed at intervals along the height direction on the inner wall of the distillation column (4). The edges of the sieve plates (12) are sealed to the inner wall of the distillation column (4).

4. The benzyltoluene continuous distillation apparatus according to claim 3, characterized in that: The condensation reflux assembly includes a condenser (15) and a reflux tank (17). The top of the distillation column (4) is provided with a gas phase outlet (13). The gas phase outlet (13) is connected to the condenser (15) through a second pipe (14). The condenser (15) is a tubular structure with built-in cooling water pipeline. The bottom condensate outlet of the condenser (15) is connected to the reflux tank (17) through a connecting pipe (16). The bottom pipe of the reflux tank (17) is divided into two branches. One branch is connected to one end of the reflux pump (19) through a third pipe (18). The other end of the reflux pump (19) is connected to the top reflux port of the distillation column (4) through the third pipe (18). A third control valve (20) is installed on the third pipe (18). The other branch is a collection pipe (21). A fourth control valve (22) is installed on the collection pipe (21).

5. A benzyltoluene continuous distillation apparatus according to claim 3, characterized in that: The tower reboiler discharge assembly includes a discharge pipe (8), which is welded to the bottom of the tower reboiler (7). A second control valve (9) and a sampling valve (10) are installed on the discharge pipe (8) in sequence.

6. The benzyltoluene continuous distillation apparatus according to claim 2, characterized in that: The feed pump (3) is a metering pump, and the flow meter (6) is a rotor flow meter.

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