Stripping tower for continuous production

Abstract

The utility model provides a stripping tower for continuous production, which solves the problems of low production efficiency and unstable product quality of the existing stripping tower. Comprising a stripping tower body, the upper half section of the tower body is provided with a feed liquid inlet, and the lower half section of the tower body is provided with a steam inlet; a defoaming plate is arranged above the feed liquid inlet, a defoaming agent inlet and a liquid level sensor are arranged above the defoaming plate, the liquid level sensor is electrically connected with a defoaming agent control system, and the defoaming agent control system controls a defoaming agent to enter the defoaming agent inlet according to liquid level data of the liquid level sensor. The stripping tower is widely applied to the technical field of stripping tower equipment.

Description

Technical Field

[0001] The present application relates to the technical field of stripping tower equipment, and more specifically, to a stripping tower for continuous production. Background Art

[0002] Traditionally, the hydrolysis reaction of aromatics is mainly carried out in an intermittent reactor. During the hydrolysis reaction, the aromatics generate the main product VB6 and the byproduct n-butyraldehyde. Since the heat exchange area of ​​the autoclave reactor is small and the evaporation effect is poor, n-butyraldehyde cannot be separated in time, and VB6 reacts with n-butyraldehyde to generate impurities, which reduces the yield of the hydrolysis reaction of aromatics, and the back mixing and liquid foam entrainment phenomena are serious. In addition, the autoclave reactor needs to perform auxiliary operations such as feeding and unloading during intermittent operation, and the product quality is affected by the auxiliary operations and has poor stability.

[0003] At present, the existing aromatic hydrolysis reaction is mainly carried out in a plate stripper. The plate stripper includes a tower body and a tower plate. During the mass transfer process, the raw material liquid flows along the tower plate and the downcomer to the lower tower plate, and the steam is lifted from the opening of the tower plate from bottom to top, countercurrently contacts the liquid on the tower plate, and performs stripping separation on the light component n-butyraldehyde. Compared with the traditional intermittent reactor reaction, it has the advantages of high extraction efficiency and no need for auxiliary operation. However, since the steam contacts the liquid in the form of bubbling during the stripping process, the liquid is prone to foaming under the bubbling action, and causes back mixing and liquid foam entrainment, which affects the mass transfer efficiency and reaction yield, resulting in low production efficiency and unstable product quality. Therefore, it is urgent to improve the existing stripper to meet the needs of the aromatic hydrolysis reaction. Utility Model Content

[0004] In order to solve the above-mentioned existing problems, the technical solution adopted by the utility model is: to provide a stripping tower for continuous production, which solves the problems of low production efficiency and unstable product quality caused by serious backmixing and liquid foam entrainment in the hydrolysis reaction of aromatics in the existing stripping tower, including a stripping tower body, a liquid feed inlet is provided in the upper half of the tower body, and a steam inlet is provided in the lower half of the tower body; a defoaming plate is provided above the liquid feed inlet, a defoaming agent feed inlet and a liquid level sensor are provided above the defoaming plate, the liquid level sensor is electrically connected to the defoaming agent control system, and the defoaming agent control system controls the defoaming agent to enter the defoaming agent feed inlet according to the liquid level data of the liquid level sensor.

[0005] Preferably, the defoamer feed port is connected to a defoamer feed ring inside the tower body, an opening is provided on the defoamer feed ring, and the defoamer feed ring is coaxial with the tower body.

[0006] Preferably, the tower body is a plate tower, and a plurality of groups of tower plates are arranged at intervals inside the tower body.

[0007] Preferably, the tower plate is provided with an overflow weir, a plurality of overflow holes are evenly arranged on the tower plate, and upper and lower adjacent tower plates are staggered.

[0008] Preferably, the outer edge of the foam removal plate abuts against the inner wall of the tower body, and the foam removal plate is a corrugated plate.

[0009] Preferably, the tower body is provided with a side-entry agitator, and the side-entry agitator is arranged below the steam inlet.

[0010] Preferably, the utility model also includes a liquid tank, a preheater, and a condenser. The liquid tank is connected to the preheater through a pipeline, and a circulating pump is provided on the pipeline. The preheater is connected to the liquid feed port of the tower body. Discharge ports are provided at the top and bottom of the tower body, and the discharge port at the top of the tower body is connected to the condenser through a pipeline.

[0011] Preferably, the number of tower bodies is at least two, and the multiple tower bodies are arranged side by side. The bottom discharge port of the previous tower body is connected to the liquid feed port of the next adjacent tower body through a pipeline, and a circulating pump is provided on the pipeline.

[0012] The beneficial effects of the utility model are as follows: according to the liquid level data of the liquid level sensor, the defoamer control system timely and accurately controls the defoamer to enter the defoamer feed port for defoaming, thereby avoiding the enrichment of foam at the top of the tower body, avoiding the problems of product loss caused by liquid foam entrainment and difficulty in post-processing of the top fraction of the tower body; the defoaming efficiency is high, and the foam liquid level is detected by the liquid level sensor throughout the whole process, without manual monitoring, saving manpower; the defoamer enters the tower body through the defoamer feed ring opening and is evenly sprinkled out, with a larger contact area with the foam, more thorough defoaming, convenient and rapid defoaming, and improved defoaming efficiency; the tower body is provided with a side-entry agitator, which improves the mass transfer efficiency and reaction conversion rate of the feed liquid and steam inside the tower body; the aromatic hydrolysis reaction is continuously operated through multiple stripping towers, which improves the evaporation efficiency, extraction efficiency and hydrolysis reaction yield of n-butyraldehyde, thereby improving the production efficiency, and the obtained product is stable and of high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0016] Explanation of symbols in the figure: 1. Tower body; 2. Defoaming plate; 3. Liquid level sensor; 4. Defoaming agent feed ring; 5. Tower plate; 6. Side-entry agitator; 7. Liquid tank; 8. Preheater; 9. Condenser; 10. Circulation pump; 11. Liquid feed inlet; 12. Defoaming agent feed inlet. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0019] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] A stripping tower for continuous production provided in an embodiment of the present application is now described.

[0021] See also Figure 1 , is a schematic diagram of the structure of the utility model, the stripping tower for continuous production comprises a stripping tower body 1, the upper half of the tower body 1 is provided with a feed liquid feed port 11, the lower half of the tower body 1 is provided with a steam inlet, the raw material feed liquid enters the tower body 1 through the feed liquid feed port 11 and sprays downward, the stripping steam enters the tower body 1 through the steam inlet and rises upward, after the feed liquid and the steam are countercurrently contacted and stripped, the light component n-butyraldehyde produced by the hydrolysis reaction in the feed liquid is enriched at the top of the tower body 1. Please refer to Figure 2 ,for Figure 1In the partial enlarged view at point A, a defoaming plate 2 is provided above the liquid feed inlet 11, a defoaming agent feed inlet 12 and a liquid level sensor 3 are provided above the defoaming plate 2, the liquid level sensor 3 is electrically connected to the defoaming agent control system, and the defoaming agent control system controls the defoaming agent to enter the defoaming agent feed inlet 12 according to the liquid level data of the liquid level sensor 3. Specifically, the foam generated by the steam entraining the liquid moves to the top of the tower body 1, and in order to avoid the foam from being enriched at the top of the tower body 1, it is necessary to defoam it; when the foam level at the top of the tower body 1 is low, the defoaming plate 2 defoams the foam and effectively collects droplets; when the foam level height exceeds the defoaming plate 2, the liquid level sensor 3 detects the foam level change and transmits the liquid level data to the defoaming agent control system, and the defoaming agent control system promptly and accurately controls the defoaming agent to enter the tower body 1 from the defoaming agent feed port 12, and defoams the foam on the defoaming plate 2, thereby avoiding the problem of product loss caused by liquid foam entrainment and the difficulty in post-processing of the top fraction of the tower body 1; the defoaming efficiency is high, and the foam level is detected by the liquid level sensor 3 throughout the process, without the need for manual monitoring, saving manpower.

[0022] Furthermore, the defoamer feed port 12 is connected to a defoamer feed ring 4 inside the tower body 1, and an opening is provided on the defoamer feed ring 4, and the defoamer feed ring 4 is coaxial with the tower body 1. The defoamer enters the tower body 1 through the opening of the defoamer feed ring 4 and is evenly sprinkled, with a larger contact area with the foam, more thorough defoaming, and convenient for rapid defoaming, thereby improving defoaming efficiency.

[0023] Furthermore, the tower body 1 is a plate-type tower, and a plurality of groups of tower plates 5 are arranged at intervals inside the tower body 1 .

[0024] Furthermore, the tower plate 5 is provided with an overflow weir, and a plurality of overflow holes are evenly arranged on the tower plate 5. The upper and lower adjacent tower plates 5 are staggered, and the upper and lower tower plates 5 form a sealed area, and the steam is guided to pass through the overflow holes on the tower plate 5 to contact the feed liquid on the tower plate 5, so that the light component n-butyraldehyde can be separated in time, and the VB6 product and n-butyraldehyde generated by the hydrolysis reaction of the feed liquid can be effectively separated in the tower body 1, so as to avoid the reaction of VB6 and n-butyraldehyde to generate impurities, improve the reaction yield, and realize continuous production.

[0025] Furthermore, the outer edge of the foam removal plate 2 abuts against the inner wall of the tower body 1 , and the foam removal plate 2 is a corrugated plate, which increases the contact area with the foam and improves the defoaming efficiency.

[0026] Furthermore, the tower body 1 is provided with a side-entry agitator 6 , which is arranged below the steam inlet and is used to evenly mix the feed liquid in the tower body 1 , thereby improving the mass transfer efficiency and reaction conversion rate of the feed liquid in the tower body 1 .

[0027] The continuous production stripping tower also includes a liquid tank 7, a preheater 8, and a condenser 9. The liquid tank 7 is connected to the preheater 8 through a pipeline, and a circulating pump 10 is provided on the pipeline. The preheater 8 is connected to a liquid feed inlet 11 of the tower body 1. Discharge ports are provided at the top and bottom of the tower body 1, and the top discharge port of the tower body 1 is connected to the condenser 9 through a pipeline.

[0028] Furthermore, the number of tower bodies 1 is at least two, and the multiple tower bodies 1 are arranged side by side. The bottom discharge port of the tower body 1 of the previous order is connected to the liquid feed port 11 of the adjacent tower body 1 of the next order through a pipeline, and a circulating pump 10 is provided on the pipeline. In this embodiment, the number of tower bodies 1 is two, and the aromatic hydrolysis reaction is continuously operated by a double stripping tower, which improves the evaporation efficiency, extraction efficiency and hydrolysis reaction yield of n-butyraldehyde, thereby improving the production efficiency, and the obtained product is stable and of high quality.

[0029] The working process of the utility model is as follows: the raw material liquid enters the preheater 8 from the liquid tank 7 through the pipeline under the action of the circulating pump 10, enters the tower body 1 from the liquid feed port 11 after being heated by the preheater 8, and sprays downwards, the steam is lifted upwards from the steam inlet tower body 1, the liquid and the steam are countercurrently contacted and stripped inside the tower body 1, the light component n-butyraldehyde produced by the hydrolysis reaction in the liquid is enriched at the top of the tower body 1, and the foam produced by the liquid entrained by the steam moves to the top of the tower body 1. When the foam liquid level at the top of the tower body 1 is lower than the defoaming plate 2, the defoaming plate 2 performs defoaming treatment on the foam and effectively collects droplets; when the foam liquid level exceeds the defoaming plate 2, the liquid level sensor 3 detects the change of the foam liquid level and transmits the liquid level data to the defoaming agent control system, and the defoaming agent control system controls the defoaming agent to enter the tower body 1 from the defoaming agent feed port 12 to defoam the foam above the defoaming plate 2. Part of the water vapor and n-butyraldehyde enter the condenser 9 through the top discharge port of the tower body 1 for condensation, and part of the liquid enters the stripping tower body 1 of the next stage through the bottom discharge port of the tower body 1, and after countercurrent contact with the steam and repeated stripping distillation, enters the condenser 9 through the top discharge port of the tower body 1 for condensation to obtain the final product.

[0030] In the utility model, according to the liquid level data of the liquid level sensor 3, the defoamer control system timely and accurately controls the defoamer to enter the defoamer feed port 12 for defoaming, thereby avoiding the enrichment of foam at the top of the tower body 1, avoiding the problems of product loss caused by liquid foam entrainment and difficulty in post-processing of the top fraction of the tower body 1; the defoaming efficiency is high, and the foam liquid level is detected by the liquid level sensor 3 throughout the whole process, without manual monitoring, saving manpower; the defoamer enters the tower body 1 through the opening of the defoamer feed ring 4 and is evenly sprinkled, with a larger contact area with the foam, more thorough defoaming, convenient for rapid defoaming, and improved defoaming efficiency; the tower body 1 is provided with a side-entry agitator 6, which improves the mass transfer efficiency and reaction conversion rate of the feed liquid and steam inside the tower body 1; the aromatic hydrolysis reaction is continuously operated by multiple stripping towers, the evaporation efficiency, extraction efficiency and hydrolysis reaction yield of n-butyraldehyde are improved, thereby improving the production efficiency, and the obtained product is stable and of high quality.

[0031] The above-mentioned specific implementation methods do not cover the entire protection scope of the utility model. Modifications or equivalent replacements of the utility model should all fall within the patent coverage requirements of the utility model. In the utility model, the above-mentioned embodiments are only used to illustrate the technical solution of the present application, rather than to limit it; although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above-mentioned embodiments, or replace some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A stripping tower for continuous production, comprising a stripping tower body (1), wherein the upper half of the tower body (1) is provided with a liquid feed inlet (11), and the lower half of the tower body (1) is provided with a steam inlet; characterized in that: A defoaming plate (2) is provided above the liquid feed inlet (11), a defoaming agent feed inlet (12) and a liquid level sensor (3) are provided above the defoaming plate (2), the liquid level sensor (3) is electrically connected to a defoaming agent control system, and the defoaming agent control system controls the defoaming agent to enter the defoaming agent feed inlet (12) according to liquid level data of the liquid level sensor (3).

2. A stripping tower for continuous production as claimed in claim 1, characterized in that: The defoamer feed port (12) is connected to a defoamer feed ring (4) inside the tower body (1), an opening is provided on the defoamer feed ring (4), and the defoamer feed ring (4) is coaxial with the tower body (1).

3. A stripping tower for continuous production as claimed in claim 1, characterized in that: The tower body (1) is a plate-type tower, and a plurality of groups of tower plates (5) are arranged at intervals inside the tower body (1).

4. A stripping tower for continuous production as claimed in claim 3, characterized in that: The tower plate (5) is provided with an overflow weir, and a plurality of overflow holes are evenly arranged on the tower plate (5), and the tower plates (5) adjacent to each other are arranged alternately.

5. A stripping tower for continuous production as claimed in claim 1, characterized in that: The outer edge of the foam removal plate (2) abuts against the inner wall of the tower body (1), and the foam removal plate (2) is a corrugated plate.

6. A stripping tower for continuous production as claimed in claim 1, characterized in that: The tower body (1) is provided with a side-entry agitator (6), and the side-entry agitator (6) is arranged below the steam inlet.

7. A stripping tower for continuous production as claimed in any one of claims 1 to 6, characterized in that: The tower body (1) further comprises a liquid feed tank (7), a preheater (8), and a condenser (9); the liquid feed tank (7) is connected to the preheater (8) via a pipeline, and a circulating pump (10) is provided on the pipeline; the preheater (8) is connected to the liquid feed inlet (11) of the tower body (1); the tower body (1) is provided with discharge ports at the top and bottom; and the discharge port at the top of the tower body (1) is connected to the condenser (9) via a pipeline.

8. A stripping tower for continuous production as claimed in claim 7, characterized in that: The number of the tower bodies (1) is at least two, and the plurality of tower bodies (1) are arranged side by side. The bottom discharge port of the tower body (1) at the previous position is connected to the liquid feed port (11) of the adjacent tower body (1) at the next position via a pipeline, and a circulation pump (10) is provided on the pipeline.

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