A treatment device for monochloroacetic acid synthesis tail gas

Abstract

The present disclosure relates to the technical field of chloroacetic acid tail gas treatment, and one embodiment of the present disclosure provides a processing device for monochloroacetic acid synthesis tail gas, which comprises a first acetic acid absorption tower, a second acetic acid absorption tower, a third acetic acid absorption tower and a gas inlet pipeline, and further comprises heat preservation covers, sun protection covers, fixing mechanisms, heat preservation and sun protection mechanisms and connecting mechanisms, two heat preservation covers are movably sleeved on the first acetic acid absorption tower, the second acetic acid absorption tower and the third acetic acid absorption tower, and the sun protection covers are installed on the outer sides of the heat preservation covers. Through the above technical solution, the technical problem that the tail gas inlet pipeline and the acetic acid recovery tower in the processing device for monochloroacetic acid synthesis tail gas lack effective heat preservation and sun protection structures in the prior art, so that the temperature inside the tail gas inlet pipeline and the acetic acid recovery tower is affected by the outside world and rises, the tail gas is greatly lost when the air temperature is high, and the tail gas is easily greatly lost, thereby affecting the recovery efficiency of acetic acid is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of chloroacetic acid tail gas treatment technology, and more specifically, to a treatment device for monochloroacetic acid synthesis tail gas. Background Technology

[0002] Chloroacetic acid is an organic compound, also known as monochloroacetic acid or monochloroacetic acid. It is usually a colorless or pale yellow crystal with a pungent odor. It is synthesized from acetic acid and chlorine gas at a certain temperature and ratio. The exhaust gas produced contains hydrochloric acid, acetic acid and sulfur dioxide. If this exhaust gas is directly emitted, it will not only pollute the environment but also waste resources. Therefore, chloroacetic acid exhaust gas needs to be treated and recycled.

[0003] In existing monochloroacetic acid synthesis tail gas treatment devices, the tail gas inlet pipe and acetic acid recovery tower lack effective heat insulation and sun protection structures. This causes the temperature inside the tail gas inlet pipe and acetic acid recovery tower to rise due to external influences. Tail gas losses are significant at higher temperatures, which can easily lead to substantial tail gas losses and affect the acetic acid recovery efficiency. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a treatment device for monochloroacetic acid synthesis tail gas, which solves the technical problem that the tail gas inlet pipe and acetic acid recovery tower in the prior art lack effective heat preservation and sun protection structures, resulting in the temperature inside the tail gas inlet pipe and acetic acid recovery tower rising due to external influences, and the tail gas loss is large when the temperature is high, which easily leads to a large amount of tail gas loss and affects the recovery efficiency of acetic acid.

[0005] According to one aspect, at least one embodiment of this disclosure provides a treatment device for monochloroacetic acid synthesis tail gas, including a primary acetic acid absorption tower, a secondary acetic acid absorption tower, a tertiary acetic acid absorption tower, and an inlet pipe. The lower side of the outer surface of the primary acetic acid absorption tower is connected to an acetic acid recovery pipe. The upper side of the primary acetic acid absorption tower is connected to the lower side of the outer surface of the secondary acetic acid absorption tower via a gas transmission pipe. The upper side of the secondary acetic acid absorption tower is connected to the lower side of the outer surface of the tertiary acetic acid absorption tower via a gas transmission pipe. The inlet pipe is connected to the lower side of the outer surface of the primary acetic acid absorption tower. The device further includes: the primary acetic acid absorption tower, the secondary acetic acid absorption tower, and... Each of the three-stage acetic acid absorption towers has two heat insulation covers movably fitted onto it. A sunshade is installed on the outside of the heat insulation cover and moves synchronously with it. Multiple sets of fixing mechanisms are installed on the outside of the heat insulation cover and move synchronously with it. These fixing mechanisms are used to fix the two heat insulation covers together. Two sets of heat insulation and sunshade mechanisms are movably fitted onto the outside of the air inlet pipe. These heat insulation and sunshade mechanisms are used to insulate and protect the air inlet pipe from sunlight. Multiple sets of connecting mechanisms are provided on each heat insulation and sunshade mechanism and move synchronously with it. These connecting mechanisms are used to connect the two sets of heat insulation and sunshade mechanisms together.

[0006] The fixing mechanism includes a plug and a snap-fit ​​component. The plug includes a plurality of mounting ears installed on one of the two sides of the heat insulation cover. The mounting ears move synchronously with the heat insulation cover. The plug plate is installed on the mounting ears and moves synchronously with the mounting ears.

[0007] The snap-fit ​​component includes multiple snap-fit ​​seats installed on one of the two sides of the heat insulation cover. The snap-fit ​​seats move synchronously with the heat insulation cover. The electric push rod is disposed inside the snap-fit ​​seats. The sliding plate is installed on the inner end of the electric push rod and moves synchronously with the extension and retraction of the extension end of the electric push rod. The snap-fit ​​block is installed on the sliding plate and moves synchronously with the sliding plate.

[0008] The heat insulation and sun protection mechanism includes a heat insulation collar that is movably sleeved on the air intake pipe, and a sun protection coating disposed on the outside of the heat insulation collar.

[0009] The connecting mechanism includes a plurality of connecting lugs installed on the insulating collar, a connecting tube inserted into one of the connecting lugs on one of the two sides and capable of moving horizontally inside the connecting lug, a connecting post inserted into one of the connecting lugs on one of the two sides and capable of moving horizontally inside the connecting lug, and a gripping block installed on both the connecting tube and the connecting post.

[0010] In order to enable the snap-fit ​​between the plug-in board and the snap-fit ​​block, the plug-in board is provided with a snap-fit ​​groove, the width of which is adapted to the width of the snap-fit ​​block.

[0011] In order to limit the sliding of the sliding plate and thus ensure the stability of the sliding plate during sliding, the locking seat is equipped with multiple slide rails, and the sliding plate and the slide rails are slidably connected.

[0012] In order to achieve the connection between the connecting pipe and the connecting post, the inner wall of the connecting pipe is provided with internal threads, and the outer side of the connecting post is provided with external threads.

[0013] The beneficial effects of the embodiments disclosed herein are as follows:

[0014] In this disclosure, the combination of heat insulation cover and sun protection cover achieves heat insulation and sun protection for multiple acetic acid absorption towers, thereby ensuring the stable and normal operation of multiple acetic acid absorption towers, reducing the probability of excessive tail gas loss due to excessive internal temperature of acetic acid absorption towers, and ensuring the recovery efficiency of acetic acid.

[0015] In this disclosure, the heat insulation and sun protection mechanism is used to achieve heat insulation and sun protection for the intake pipe, thereby ensuring the normal temperature of the exhaust gas when it enters the acetic acid absorption tower through the intake pipe, reducing the probability of the exhaust gas temperature rising due to external influences, and ensuring the stability of the exhaust gas in the intake pipe and multiple acetic acid absorption towers.

[0016] In this disclosure, the fixing mechanism enables the rapid installation or disassembly of the heat insulation cover and the sun protection cover, facilitating the maintenance of the heat insulation cover and the sun protection cover by the staff. The connecting mechanism enables the rapid installation or disassembly of the two sets of heat insulation and sun protection mechanisms, thereby facilitating the maintenance of the heat insulation and sun protection mechanisms by the staff and ensuring the effectiveness of the heat insulation cover, the sun protection cover and the heat insulation and sun protection mechanisms. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram showing the exploded structure of the heat insulation cover and sun protection cover after they are fitted together in this utility model;

[0020] Figure 3This is an exploded schematic diagram of the structure in which the heat insulation and sun protection mechanism and the installation mechanism work together in this utility model.

[0021] Figure 4 In this utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0022] Figure 5 This is a schematic diagram of the fixed mechanism structure in this utility model;

[0023] Figure 6 This is a process flow diagram of the present invention.

[0024] In the diagram: 1. Primary acetic acid absorption tower; 2. Secondary acetic acid absorption tower; 3. Tertiary acetic acid absorption tower; 4. Air inlet pipe; 5. Insulation cover; 6. Sunshade cover; 7. Primary hydrochloric acid absorption tower; 8. Secondary hydrochloric acid absorption tower; 9. Primary air purification tower; 10. Secondary air purification tower;

[0025] 101. Mounting ear; 102. Connector board;

[0026] 201. Snap-fit ​​base; 202. Electric push rod; 203. Sliding plate; 204. Snap-fit ​​block;

[0027] 301. Insulating collar; 302. Sunscreen coating;

[0028] 401. Connecting ear; 402. Connecting tube; 403. Connecting post; 404. Grip block. Detailed Implementation

[0029] The present disclosure 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 disclosure and are not intended to limit the scope of the disclosure.

[0030] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" 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 disclosure based on the specific circumstances.

[0032] In this disclosure, unless otherwise expressly 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.

[0033] 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 disclosure.

[0034] 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.

[0035] like Figures 1-6The illustration shows a treatment device for monochloroacetic acid synthesis tail gas according to an embodiment of this disclosure. It includes a primary acetic acid absorption tower 1, a secondary acetic acid absorption tower 2, a tertiary acetic acid absorption tower 3, and an inlet pipe 4. It also includes a heat insulation cover 5, a sunshade cover 6, a fixing mechanism, a heat insulation and sunshade mechanism, and a connecting mechanism. Compared with the prior art, in this embodiment, the cooperation of the heat insulation cover 5 and the sunshade cover 6 achieves heat insulation and sun protection for multiple acetic acid absorption towers, thereby ensuring the stable operation of the internal components of the multiple acetic acid absorption towers, reducing the probability of excessive tail gas loss due to excessively high internal temperatures, and ensuring the recovery efficiency of acetic acid. The heat insulation and sunshade mechanism achieves... To insulate and protect the intake pipe 4 from sunlight, the temperature of the exhaust gas is kept normal when it enters the acetic acid absorption tower through the intake pipe 4. This reduces the probability of the exhaust gas temperature rising due to external influences and ensures the stability of the exhaust gas inside the intake pipe 4 and multiple acetic acid absorption towers. The fixing mechanism enables the quick installation or removal of the insulation cover 5 and the sunshade cover 6, facilitating maintenance by staff. The connecting mechanism enables the quick installation or removal of the two sets of insulation and sunshade mechanisms, further facilitating maintenance by staff and ensuring the effectiveness of the insulation cover 5, sunshade cover 6, and the insulation and sunshade mechanisms themselves.

[0036] like Figure 1 As shown, the upper side of the three-stage acetic acid absorption tower 3 is connected to the first-stage hydrochloric acid absorption tower 7 via a gas transmission pipe. The upper side of the first-stage hydrochloric acid absorption tower 7 is connected to the second-stage hydrochloric acid absorption tower 8 via a gas transmission pipe. A hydrochloric acid reflux pump is installed on the second-stage hydrochloric acid absorption tower 8. The upper side of the second-stage hydrochloric acid absorption tower 8 is connected to the first-stage air purification tower 9 via a gas transmission pipe. The upper side of the first-stage air purification tower 9 is connected to the second-stage air purification tower 10 via a gas transmission pipe. The lower side of the outer surface of the first-stage hydrochloric acid absorption tower 7 is connected to a hydrochloric acid recovery pipe. The second-stage air purification tower 10 is connected to the first-stage air purification tower 9 via a liquid transmission pipe. The first-stage air purification tower 9 is connected to the second-stage hydrochloric acid absorption tower 8 via a liquid transmission pipe. The second-stage hydrochloric acid absorption tower 8 is connected to the first-stage hydrochloric acid absorption tower 7 via a liquid transmission pipe. The first-stage hydrochloric acid absorption tower 7 is connected to the three-stage acetic acid absorption tower 3 via a liquid transmission pipe. The three-stage acetic acid absorption tower 3 is connected to the second-stage acetic acid absorption tower 2 via a liquid transmission pipe. The second-stage acetic acid absorption tower 2 is connected to the first-stage acetic acid absorption tower 1 via a liquid transmission pipe.

[0037] like Figure 1 and Figure 2 As shown, each of the primary acetic acid absorption tower 1, the secondary acetic acid absorption tower 2, and the tertiary acetic acid absorption tower 3 is movably fitted with two insulation covers 5, and a sunshade cover 6 is installed on the outside of the insulation covers 5. The insulation covers 5 and the sunshade cover 6 can provide insulation and sun protection for the three acetic acid absorption towers, thereby ensuring the stability of the internal temperature of the three acetic acid absorption towers. Multiple sets of fixing mechanisms are installed on the outside of the insulation covers 5, such as... Figure 4 and Figure 5As shown, the fixing mechanism includes a plug-in component and a snap-fit ​​component. The plug-in component includes a mounting ear 101 and a plug-in plate 102. The snap-fit ​​component includes a snap-fit ​​base 201, an electric push rod 202, a sliding plate 203, and a snap-fit ​​block 204. The plug-in plate 102 has a snap-fit ​​groove, the width of which is adapted to the width of the snap-fit ​​block 204. The snap-fit ​​block 204 can quickly snap-fit ​​with the plug-in plate 102 through the snap-fit ​​groove. The snap-fit ​​base 201 has multiple slide rails inside. The sliding plate 203 is slidably connected to the slide rails. The slide rails can limit the sliding of the sliding plate 203, ensuring the stability of the sliding plate 203 when sliding. Through the cooperation of the plug-in component and the snap-fit ​​component, the assembly of the fixing mechanism is realized, thereby realizing the installation and fixing between the two insulation covers 5, thus realizing the quick installation or disassembly of the insulation cover 5.

[0038] like Figure 1 As shown, the outer side of the air intake pipe 4 has two sets of heat insulation and sun protection mechanisms, and multiple connecting mechanisms are installed on the heat insulation and sun protection mechanisms, such as... Figure 3 As shown, the heat insulation and sun protection mechanism includes a heat insulation collar 301 and a sun protection coating 302. The connecting mechanism includes a connecting lug 401, a connecting pipe 402, a connecting post 403, and a grip block 404. The inner wall of the connecting pipe 402 is provided with an internal thread, and the outer side of the connecting post 403 is provided with an external thread. The connecting pipe 402 is threadedly connected to the connecting post 403 through the internal and external threads. The heat insulation and sun protection mechanism can provide heat insulation and sun protection for the intake pipe 4, ensuring the temperature stability of the exhaust gas when it flows inside the intake pipe 4. The cooperation of multiple sets of connecting mechanisms enables the rapid installation or removal of the heat insulation and sun protection structure installed on the intake pipe 4.

[0039] Working principle:

[0040] The exhaust gas enters the primary acetic acid absorption tower 1 through the inlet pipe 4. The primary acetic acid absorption tower 1 performs primary absorption of the acetic acid in the exhaust gas. After primary absorption, it flows through the gas transmission pipe to the secondary acetic acid absorption tower 2. The secondary acetic acid absorption tower 2 performs secondary absorption of the acetic acid in the exhaust gas. After secondary absorption, it flows through the gas transmission pipe to the tertiary acetic acid absorption tower 3. The tertiary acetic acid absorption tower 3 performs tertiary absorption of the acetic acid in the exhaust gas. After tertiary absorption, the acetic acid is returned to the chlorination section for reuse through the acetic acid recovery pipe. After tertiary absorption, it flows through the gas transmission pipe to the primary hydrochloric acid absorption tower 7. The primary hydrochloric acid absorption tower 7 performs primary absorption of the hydrochloric acid in the exhaust gas, and hydrogen chloride gas is also absorbed. After primary absorption, the gas that meets the requirements is pumped into the intermediate tank in the workshop through the hydrochloric acid recovery pipeline, and then into the hydrochloric acid storage tank in the tank area. The gas vented from the top of the tower continues to enter the secondary hydrochloric acid absorption tower 8 for absorption through the gas transmission pipe. The hydrochloric acid absorbed by the secondary hydrochloric acid absorption tower 8 is pumped into the primary hydrochloric acid absorption tower 7 through the hydrochloric acid reflux pump. The absorbed gas enters the primary air purification tower 9. After purification, the tail gas enters the secondary air purification tower 10 for absorption again. The purified liquid phase is pumped into the primary air purification tower 9, the secondary hydrochloric acid absorption tower 8, the primary hydrochloric acid absorption tower 7 and finally into the primary acetic acid absorption tower 1, thereby realizing the recovery of acetic acid and hydrochloric acid in the tail gas and the treatment of the tail gas.

[0041] During the exhaust gas treatment process, the insulation cover 5, the sunshade 6, and the insulation and sunshade mechanism ensure the stability of the internal temperature of the three acetic acid absorption towers and the inlet pipe 4, thereby keeping the exhaust gas temperature within a certain range. When maintenance of the insulation and sunshade mechanism is required, the operator uses the lever 404 to twist the connecting pipe 402 and the connecting column 403, causing the connecting column 403 to unscrew from the inside of the connecting pipe 402, thus disconnecting the connection between the connecting pipe 402 and the connecting column 403. Then, the operator removes the insulation and sunshade mechanism from the inlet pipe 4 for further inspection. When maintenance is required on the insulation cover 5 and the sunshade cover 6, the electric push rod 202 is activated. The telescopic end of the electric push rod 202 retracts, causing the sliding plate 203 to slide outward along the slide rail. The sliding plate 203 causes the locking block 204 to move outward, canceling the locking between the locking block 204 and the plug plate 102. After cancellation, the plug plate 102 is removed from the inside of the locking seat 201, canceling the connection between the two insulation covers 5. After cancellation, the insulation cover 5 and the sunshade cover 6 are removed from the acetic acid absorption tower for maintenance.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure 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 solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A treatment device for the tail gas of monochloroacetic acid synthesis, comprising a primary acetic acid absorption tower (1), a secondary acetic acid absorption tower (2), a tertiary acetic acid absorption tower (3), and an inlet pipe (4), characterized in that it further... include: The heat insulation cover (5) is movably fitted onto the first-stage acetic acid absorption tower (1), the second-stage acetic acid absorption tower (2) and the third-stage acetic acid absorption tower (3). Sunscreen (6), which is installed on the outside of the heat insulation cover (5) and moves synchronously with the heat insulation cover (5); The fixing mechanism is provided on the outside of the heat insulation cover (5) and moves synchronously with the heat insulation cover (5). The fixing mechanism is used to fix the two heat insulation covers (5) together. The heat insulation and sun protection mechanism is provided. Two sets of the heat insulation and sun protection mechanism are movably sleeved on the outside of the air intake pipe (4). The heat insulation and sun protection mechanism is used to heat and protect the air intake pipe (4) from the sun. The heat-insulating and sun-protecting mechanism is provided with multiple sets of the connecting mechanism, which move synchronously with the heat-insulating and sun-protecting mechanism. The connecting mechanism is used to connect two sets of the heat-insulating and sun-protecting mechanism.

2. The treatment device for monochloroacetic acid synthesis tail gas according to claim 1, characterized in that, The fixing mechanism includes a plug-in component and a snap-fit ​​component, wherein the plug-in component includes: Mounting ears (101), a plurality of mounting ears (101) are mounted on one side of the heat insulation cover (5), and the mounting ears (101) move synchronously with the heat insulation cover (5); A plug plate (102) is mounted on the mounting ear (101) and moves synchronously with the mounting ear (101).

3. The treatment device for monochloroacetic acid synthesis tail gas according to claim 2, characterized in that, The snap-fit ​​component includes: The card holder (201) is installed on one of the heat insulation covers (5) on both sides. The card holder (201) moves synchronously with the heat insulation cover (5). An electric push rod (202) is disposed inside the locking seat (201); A sliding plate (203) is installed on the inner end of the electric push rod (202) and moves synchronously with the extension and retraction of the extension and retraction end of the electric push rod (202); A snap-fit ​​block (204) is mounted on the sliding plate (203) and moves synchronously with the sliding plate (203).

4. The treatment device for monochloroacetic acid synthesis tail gas according to claim 1, characterized in that, The heat-insulating and sun-protecting mechanism includes: Insulating collar (301), the insulating collar (301) is movably sleeved on the air intake pipe (4); A sun protection coating (302) is provided on the outside of the heat insulation ring (301).

5. The treatment device for monochloroacetic acid synthesis tail gas according to claim 4, characterized in that, The connecting mechanism includes: Connecting lugs (401), a plurality of connecting lugs (401) are installed on the insulating collar (301); A connecting tube (402) is inserted into the connecting lug (401) on one of the two sides and is capable of moving horizontally inside the connecting lug (401); A connecting post (403) is inserted into the connecting lug (401) on one of the two sides and is capable of moving horizontally inside the connecting lug (401); The gripping block (404) is installed on both the connecting pipe (402) and the connecting post (403).

6. The treatment device for monochloroacetic acid synthesis tail gas according to claim 3, characterized in that, The plug plate (102) has a snap-fit ​​groove, the width of which is adapted to the width of the snap-fit ​​block (204).

7. The treatment device for monochloroacetic acid synthesis tail gas according to claim 3, characterized in that, The card holder (201) is equipped with multiple slide rails inside, and the sliding plate (203) is slidably connected to the slide rails.

8. The treatment device for monochloroacetic acid synthesis tail gas according to claim 5, characterized in that, The inner wall of the connecting pipe (402) is provided with internal threads, and the outer side of the connecting column (403) is provided with external threads.

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