Glacial acetic acid recovery tank and glacial acetic acid unloading residual liquid recovery device

Abstract

The utility model relates to the technical field of glacial acetic acid recovery, and is a glacial acetic acid recovery tank and glacial acetic acid unloading residual liquid recovery device, which comprises a tank body, a support frame and a heating device, the tank body is provided with the support frame, the top wall of the tank body is respectively connected with a feeding pipeline, a discharging pipeline and a emptying pipeline, an acid and alkali resistant brick terrace is laid on the foundation of the bottom of the tank body, acid and alkali resistant bricks are piled around the edge of the acid and alkali resistant brick terrace to form a cofferdam, the heating device comprises a horizontal coil pipe, a steam input pipeline and a steam output pipeline, the horizontal coil pipe is arranged in the tank body, the steam input pipeline is connected with the inlet of the horizontal coil pipe through the acid and alkali resistant brick cofferdam, the inlet of the steam output pipeline is connected with the outlet of the horizontal coil pipe, and the steam output pipeline extends to the outside of the acid and alkali resistant brick cofferdam. The utility model is reasonable and compact in structure, convenient to use, can recover residual glacial acetic acid after glacial acetic acid unloading operation, and has the advantages of high operation safety factor and high recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of glacial acetic acid recovery technology, and is a glacial acetic acid recovery tank and a glacial acetic acid unloading residue recovery device. Background Technology

[0002] Glacial acetic acid, commonly known as anhydrous acetic acid, is an organic monocarboxylic acid. At room temperature, it is a colorless liquid with a strong, pungent acidic odor. Pure glacial acetic acid forms colorless crystals below its freezing point of 16.6℃. Its boiling point is 118.1℃, and its density is approximately 1.05 g / cm³. It is readily soluble in organic solvents such as water, ethanol, ether, and carbon tetrachloride. Furthermore, glacial acetic acid reacts with reactive metals such as magnesium, zinc, and iron to produce corresponding acetates and hydrogen gas.

[0003] Glacial acetic acid is an important organic chemical raw material, widely used in synthetic fibers, adhesives, pharmaceuticals, pesticides, and dyes. It can be used to produce vinyl acetate, purified terephthalic acid (PTA), acetic anhydride, acetate esters, and coatings. A chemical company's 1.2 million tons / year PTA project requires a large amount of glacial acetic acid as an auxiliary material for PTA synthesis. A glacial acetic acid storage tank area is located near the PTA production unit. The chemical company uses glacial acetic acid tank trucks to transport the purchased acetic acid to the storage area, where unloading operations are performed. During unloading, the unloading pipe at the bottom of the acetic acid tank truck connects to the fixed unloading arm in the storage area, and then the acetic acid is filled into the tanks. On average, the chemical company needs 3 to 5 glacial acetic acid tank trucks to transport the acid to the storage area daily for unloading to ensure the production needs of the PTA production unit are met. After unloading acetic acid from a tanker truck, due to the inherent limitations of the unloading arm, approximately 20kg to 50kg of acetic acid remains at the bottom of the upper tank and cannot be completely unloaded. Currently, the chemical company handles the residual acetic acid by first disconnecting the unloading pipe from the unloading arm at the bottom of the tanker truck, and then having unloading personnel collect the residual acetic acid using plastic collection buckets. This method of collecting and handling residual acetic acid from tanker trucks is not only labor-intensive but also prone to spillage, and unloading personnel are susceptible to corrosive damage from acetic acid. Furthermore, it easily pollutes the unloading area, especially corroding and damaging the floor, and can also easily lead to fire and explosion accidents.

[0004] In summary, current methods for recovering residual acetic acid after unloading from acetic acid tank trucks suffer from high labor intensity, high risk, and low processing efficiency, making them a pressing technical challenge for chemical companies. Summary of the Invention

[0005] This utility model provides a glacial acetic acid recovery tank and a glacial acetic acid unloading residue recovery device, which overcomes the shortcomings of the above-mentioned prior art. It can effectively solve the problems of high labor intensity, high risk factor and low processing efficiency in the existing methods of recovering residual glacial acetic acid after unloading operations.

[0006] One of the technical solutions of this utility model is achieved through the following measures: A glacial acetic acid recovery tank includes a tank body, a support frame, and a heating device. The support frame is symmetrically fixedly installed around the bottom of the tank body. The top wall of the tank body is fixedly connected to an inlet pipeline, an outlet pipeline, and an evacuation pipeline. The foundation at the bottom of the tank body is paved with acid-alkali resistant brick flooring larger than the area of ​​the bottom wall of the tank body. An acid-alkali resistant brick dike is piled around the edge of the acid-alkali resistant brick flooring. The heating device includes a horizontal coil, a steam input pipeline, and a steam output pipeline. A horizontal coil is installed inside the tank body. A left pipe hole and a right pipe hole are spaced apart on the left and right sides of the front side of the bottom wall of the tank body. The steam input pipeline starts from the left side of the acid-alkali resistant brick dike, passes through the acid-alkali resistant brick dike, and goes below the left pipe hole. The outlet of the steam input pipeline passes through the left pipe hole and is fixedly connected to the inlet of the horizontal coil. The steam output pipeline starts from the right side of the acid-alkali resistant brick dike, passes through the acid-alkali resistant brick dike, and goes below the right pipe hole. The inlet of the steam output pipeline passes through the right pipe hole and is fixedly connected to the outlet of the horizontal coil.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] The aforementioned feed pipeline extends through the top wall of the box to the upper side of the bottom wall inside the box. A quick-connect feed connector is fixedly installed at the inlet of the feed pipeline, and a feed valve is fixedly installed on the feed pipeline between the quick-connect feed connector and the top wall of the box.

[0009] The aforementioned discharge pipeline extends through the top wall of the box to the upper side of the bottom wall inside the box. A quick-connect discharge connector is fixedly installed at the outlet of the discharge pipeline, and a discharge valve is fixedly installed on the discharge pipeline between the quick-connect discharge connector and the top wall of the box.

[0010] The above-mentioned drainage pipeline consists of a drainage riser and a 90° elbow fitting that connects the top outlet of the drainage riser.

[0011] The outer surface of the aforementioned enclosure is covered with an insulation layer; or / and, the top of the enclosure is covered with a fireproof blanket, and the bottom of the enclosure is fixedly installed with an electrostatic grounding post; or / and, the top wall of the enclosure is provided with an opening, and a cover plate is provided on the opening, which is hinged to the enclosure wall, and a lifting ring is provided on the top of the cover plate.

[0012] Steam quick-connect couplings are fixedly installed on the steam input pipeline inlet and steam output pipeline outlet on the outside of the aforementioned acid and alkali resistant brick cofferdam, and steam traps are fixedly installed on the steam output pipeline on the outside of the acid and alkali resistant brick cofferdam.

[0013] The aforementioned acid and alkali resistant brick floor is equipped with a sewage drain, and the inlet of the sewage drain is equipped with a filter screen cover; a sewage pipeline is fixedly connected between the bottom wall of the box and the inlet of the sewage drain, and the outlet diameter of the sewage pipeline is smaller than the inlet diameter of the sewage drain; a sewage valve is fixedly installed on the sewage pipeline.

[0014] A sight glass is fixedly installed on the side wall of the aforementioned enclosure; a temperature gauge is fixedly installed on the enclosure.

[0015] The second technical solution of this utility model is achieved through the following measures: A residual liquid recovery device for unloading acetic acid includes an acetic acid tanker, an unloading arm, a collection bucket, and an acetic acid recovery box. The unloading area of ​​the acetic acid tanker is equipped with an acid and alkali resistant parking area. An acetic acid drain pipeline is fixedly connected between the liquid outlet at the bottom of the acetic acid tank on the acetic acid tanker and the inlet of the unloading arm. A drain pipeline is fixedly connected to the acetic acid drain pipeline. A collection bucket is set below the outlet of the drain pipeline. A three-way valve is fixedly installed on the drain pipeline. A residual liquid conveying pipeline is fixedly connected between the right outlet of the three-way valve and the inlet of the feed pipeline. A public steam network branch is fixedly connected to the left inlet of the steam input pipeline. A pressure reducing valve and a pressure gauge are fixedly installed sequentially along the medium flow direction on the public steam network branch. A condensate discharge branch is fixedly connected to the right outlet of the steam output pipeline. An acetic acid conveying pipeline is fixedly connected to the outlet of the discharge pipeline. A conveying pump is fixedly installed on the acetic acid conveying pipeline.

[0016] This utility model has a reasonable and compact structure and is easy to use. It can recover residual glacial acetic acid after unloading operations and has the advantages of high operational safety and high recovery efficiency. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the main structure of the glacial acetic acid recovery box of this utility model.

[0018] Appendix Figure 2 This is a schematic diagram of the process flow of the glacial acetic acid unloading residue recovery device of this utility model.

[0019] The codes in the attached diagram are as follows: 1 for the housing, 2 for the support frame, 3 for the feed line, 4 for the discharge line, 5 for the vent line, 6 for the opening, 7 for the cover plate, 8 for the lifting ring, 9 for the horizontal coil, 10 for the steam input line, 11 for the steam output line, 12 for the left pipe hole, 13 for the right pipe hole, 14 for the steam trap, 15 for the quick-connect feed connector, 16 for the feed valve, 17 for the quick-connect discharge connector, 18 for the discharge valve, 19 for the vent riser, 20 for the 90° elbow fitting, 21 for the static grounding post, 22 for the acid and alkali resistant brick floor, 23 for the acid and alkali resistant brick cofferdam, and 24 for the steam quick-connect fitting. 26 is a gasket, 27 is a drain, 28 is a filter cover, 29 is a drain line, 30 is a drain valve, 31 is a sight glass, 32 is a thermometer, 33 is a glacial acetic acid tanker, 34 is an unloading arm, 35 is a collection bucket, 36 is an acid and alkali resistant parking area, 37 is a glacial acetic acid drain line, 38 is a drain line, 39 is a three-way valve, 40 is a residual liquid conveying line, 41 is a branch line of the public steam network, 42 ​​is a condensate discharge branch line, 43 is a glacial acetic acid conveying line, 44 is a conveying pump, 45 is a pressure reducing valve, 46 is a pressure gauge, 47 is an unloading quick connector, and 48 is a shut-off valve. Detailed Implementation

[0020] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0021] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0024] Example 1: As shown in the attached document Figure 1As shown, the acetic acid recovery tank includes a tank body 1, a support frame 2, and a heating device. The support frame 2 is symmetrically fixed around the bottom of the tank body 1. The top wall of the tank body 1 is fixedly connected to an inlet pipe 3, an outlet pipe 4, and an exhaust pipe 5. The foundation at the bottom of the tank body 1 is paved with acid and alkali resistant brick flooring 22, which is larger than the area of ​​the bottom wall of the tank body 1. An acid and alkali resistant brick dike 23 is piled around the edge of the acid and alkali resistant brick flooring 22. The heating device includes a horizontal coil 9, a steam input pipe 10, and a steam output pipe 11. A horizontal coil is installed inside the tank body 1. The horizontal coil 9 has a left pipe hole 12 and a right pipe hole 13 spaced apart on the front side of the bottom wall of the housing 1. The steam input pipeline 10 starts from the left side of the acid and alkali resistant brick cofferdam 23, passes through the acid and alkali resistant brick cofferdam 23, and goes below the left pipe hole 12. The outlet of the steam input pipeline 10 passes through the left pipe hole 12 and is fixedly connected to the inlet of the horizontal coil 9. The steam output pipeline 11 starts from the right side of the acid and alkali resistant brick cofferdam 23, passes through the acid and alkali resistant brick cofferdam 23, and goes below the right pipe hole 13. The inlet of the steam output pipeline 11 passes through the right pipe hole 13 and is fixedly connected to the outlet of the horizontal coil 9.

[0025] As needed, the opening 6 on the top wall of the box 1 can be shaped and sized according to actual requirements. It can be used as a maintenance hand hole for the box 1, or as a spare insertion hole for the feed pipe and discharge pipe. The cover plate 7 can prevent impurities or rainwater from entering the box 1.

[0026] The enclosure 1 can be made of 316L (or a corrosion-resistant material of higher quality than 316L) plate, with a plate wall thickness of not less than 8mm, and the design service life of the enclosure 1 is not less than 10 years.

[0027] 316L pipes can be used for feed line 3, discharge line 4 and vent line 5.

[0028] The acid and alkali resistant brick flooring 22 and the acid and alkali resistant brick dike 23 can prevent accidental leakage of this utility model from causing harm to the workers.

[0029] The horizontal coil 9 can be wrapped around the lower part of the side wall of the box 1 to improve the heat exchange efficiency of the horizontal coil 9. The horizontal coil 9, the steam inlet pipeline 10 and the steam outlet pipeline 11 can all be made of DN15 pipe material and 316L material. The valve port diameter of the steam trap 14 can be PN16.

[0030] As attached Figure 2 As shown, the steam input pipeline 10 inlet is connected to the public steam network branch line 41, and the steam output pipeline 11 outlet is connected to the condensate discharge branch line 42, realizing heat exchange between circulating steam and glacial acetic acid, preventing the ambient temperature from being too low, and avoiding crystallization of glacial acetic acid in the tank 1. This utility model recovers glacial acetic acid and has the advantages of high safety factor and high recovery efficiency.

[0031] The above-mentioned residual liquid recovery device for unloading glacial acetic acid tanker truck 33 can be further optimized and / or improved according to actual needs:

[0032] Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, the feed line 3 extends through the top wall of the box 1 to the upper side of the bottom wall inside the box 1. A feed quick-connect connector 15 is fixedly installed at the inlet of the feed line 3. A feed valve 16 is fixedly installed on the feed line 3 between the feed quick-connect connector 15 and the top wall of the box 1.

[0033] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, the discharge pipeline 4 extends through the top wall of the box 1 to the upper side of the bottom wall inside the box 1. A quick-connect discharge connector 17 is fixedly installed at the outlet of the discharge pipeline 4. A discharge valve 18 is fixedly installed on the discharge pipeline 4 between the quick-connect discharge connector 17 and the top wall of the box 1.

[0034] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, the venting pipeline 5 consists of a venting riser 19 and a 90° elbow fitting 20 that connects to the top outlet of the venting riser 19.

[0035] As needed, the venting line 5 can balance the pressure inside the box 1, which is conducive to the sedimentation of the liquid phase of the gas-liquid mixture inside the box 1. The 90° elbow fitting 20 can prevent impurities or rainwater from entering the venting riser 19.

[0036] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, the outer surface of the box 1 is covered with an insulation layer; the top of the box 1 is covered with a fireproof blanket, and the bottom of the box 1 is fixedly installed with an electrostatic grounding post 21; the top wall of the box 1 is provided with an opening 6, and a cover plate 7 is provided on the opening 6 and hinged to the wall of the box 1, and a lifting ring 8 is provided on the top of the cover plate 7.

[0037] As required, glacial acetic acid is classified as a Class A flammable and explosive liquid. The static grounding post 21 effectively releases the static electricity of this invention, improving the safety of glacial acetic acid recovery.

[0038] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, steam quick-connect fittings 24 are fixedly installed on the steam input pipeline 10 inlet and the steam output pipeline 11 outlet outside the acid and alkali resistant brick cofferdam 23, and steam traps 14 are fixedly installed on the steam output pipeline 11 outside the acid and alkali resistant brick cofferdam 23.

[0039] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, each support frame 2 has a pad 26 fixedly installed at its bottom end, and the pad 26 is fixed to the acid and alkali resistant brick floor 22 by anchor bolts.

[0040] If necessary, the pad 26 can enhance the stability of the support frame 2.

[0041] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, a sewage drain 27 is installed on the acid and alkali resistant brick floor 22, and a filter screen cover 28 is installed at the inlet of the sewage drain 27; a sewage pipe 29 is fixedly connected between the bottom wall of the box 1 and the inlet of the sewage drain 27, and the outlet diameter of the sewage pipe 29 is smaller than the inlet diameter of the sewage drain 27; a sewage valve 30 is fixedly installed on the sewage pipe 29.

[0042] As needed, the outlet diameter of the sewage pipeline 29 is smaller than the diameter of the sewage drain 27, so that it can realize both the sewage discharge function of the box 1 and the sewage discharge function inside the acid and alkali resistant brick cofferdam 23.

[0043] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, a sight glass 31 is fixedly installed on the side wall of the enclosure 1; a temperature gauge 32 is fixedly installed on the enclosure 1.

[0044] As needed, the collection status of glacial acetic acid in the chamber 1 can be observed through the sight glass 31, and the timing of starting the heating device or adjusting the steam demand can be selected through the temperature gauge 32.

[0045] Example 10: As attached Figure 2 As shown, the acetic acid unloading residue recovery device includes an acetic acid tanker truck 33, an unloading arm 34, a collection tank 35, and an acetic acid recovery box. The unloading area of ​​the acetic acid tanker truck 33 is equipped with an acid and alkali resistant parking area 36. An acetic acid drain line 37 is fixedly connected between the bottom outlet of the acetic acid tank on the acetic acid tanker truck 33 and the inlet of the unloading arm 34. A drain line 38 is fixedly connected to the acetic acid drain line 37. A collection tank 35 is installed below the outlet of the drain line 38. A fixed installation is mounted on the drain line 38. There is a three-way valve 39. The right outlet of the three-way valve 39 is fixedly connected to the inlet of the feed line 3 via a residual liquid conveying line 40. The left inlet of the steam input line 10 is fixedly connected to a public steam network branch line 41. A pressure reducing valve 45 and a pressure gauge 46 are fixedly installed on the public steam network branch line 41 along the direction of medium flow. The right outlet of the steam output line 11 is fixedly connected to a condensate discharge branch line 42. The outlet of the discharge line 4 is fixedly connected to a glacial acetic acid conveying line 43. A conveying pump 44 is fixedly installed on the glacial acetic acid conveying line 43.

[0046] As needed, the collection tank 35 is used to collect the glacial acetic acid liquid that cannot be completely drained from the glacial acetic acid tanker 33 and the glacial acetic acid drainage pipeline 37, and the outlet of the condensate drainage branch line 42 is connected to the condensate drainage system.

[0047] The outlet of the glacial acetic acid drain line 37 and the inlet of the unloading arm 34 can be fixedly connected by an unloading quick connector 47, and a shut-off valve 48 is fixedly installed on the inlet line of the unloading arm 34.

[0048] Depending on the needs, the pipelines and equipment of the glacial acetic acid unloading residue recovery device may also be equipped with conventional valves, thermometers and pressure gauges known in the art, as required by production.

[0049] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0050] The usage process of this utility model is as follows: First, glacial acetic acid tanker 33 delivers glacial acetic acid liquid and fills the production unit tank area with glacial acetic acid liquid through unloading arm 34; then, after the glacial acetic acid tanker 33 has finished unloading, the residual gas-liquid mixture in the glacial acetic acid drain line 37 and the unloading arm 34 sequentially enters the tank 1 through the drain line 38, the residual liquid conveying line 40, and the feed line 3 for liquid phase sedimentation; then, the residual glacial acetic acid liquid unloaded from the glacial acetic acid tanker 33 sequentially passes through the glacial acetic acid drain line... 37. The drain line 38, residual liquid conveying line 40 and feed line 3 enter the tank 1 for recycling. Steam in the public steam network enters the horizontal coil 9 through the public steam network branch line 41 and steam input line 10 in sequence to avoid the temperature in the tank 1 being too low. Finally, the glacial acetic acid liquid recovered in the tank 1 is transported to the production unit storage tank for later use by the transfer pump 44. The collection bucket 35 is used to collect the glacial acetic acid liquid that cannot be discharged into the tank 1 from the glacial acetic acid tank truck 33 and the glacial acetic acid discharge line 37.

Claims

1. A glacial acetic acid recovery tank, characterized in that... The device includes a housing, a support frame, and a heating device. The support frame is symmetrically fixed around the bottom of the housing. The top wall of the housing is fixedly connected to the feed pipeline, discharge pipeline, and vent pipeline. The foundation at the bottom of the housing is paved with acid and alkali resistant bricks larger than the area of ​​the bottom wall of the housing. An acid and alkali resistant brick dike is piled around the edge of the acid and alkali resistant brick dike. The heating device includes a horizontal coil, a steam input pipeline, and a steam output pipeline. The horizontal coil is installed inside the housing. A left pipe hole and a right pipe hole are spaced apart on the left and right sides of the front side of the bottom wall of the housing. The steam input pipeline starts from the left side of the acid and alkali resistant brick dike, passes through the acid and alkali resistant brick dike, and goes below the left pipe hole. The outlet of the steam input pipeline passes through the left pipe hole and is fixedly connected to the inlet of the horizontal coil. The steam output pipeline starts from the right side of the acid and alkali resistant brick dike, passes through the acid and alkali resistant brick dike, and goes below the right pipe hole. The inlet of the steam output pipeline passes through the right pipe hole and is fixedly connected to the outlet of the horizontal coil.

2. The glacial acetic acid recovery tank according to claim 1, characterized in that... The feed pipeline passes through the top wall of the box and extends to the upper side of the bottom wall inside the box. A quick-connect feed connector is fixedly installed at the inlet of the feed pipeline, and a feed valve is fixedly installed on the feed pipeline between the quick-connect feed connector and the top wall of the box.

3. The glacial acetic acid recovery tank according to claim 1 or 2, characterized in that... The discharge pipeline extends through the top wall of the box to the upper side of the bottom wall inside the box. A quick-connect discharge connector is fixedly installed at the outlet of the discharge pipeline, and a discharge valve is fixedly installed on the discharge pipeline between the quick-connect discharge connector and the top wall of the box.

4. The glacial acetic acid recovery tank according to claim 3, characterized in that... The venting pipeline consists of a venting riser and a 90° elbow fitting that connects to the outlet at the top of the venting riser.

5. The glacial acetic acid recovery tank according to claim 1, 2, or 4, characterized in that... The outer surface of the enclosure is covered with an insulation layer; or / and, the top of the enclosure is covered with a fireproof blanket, and the bottom of the enclosure is fixedly installed with an electrostatic grounding post; or / and, the top wall of the enclosure is provided with an opening, and a cover plate is provided on the opening, which is hinged to the enclosure wall, and a lifting ring is provided on the top of the cover plate.

6. The glacial acetic acid recovery tank according to claim 5, characterized in that... Steam quick-connect couplings are fixedly installed on the steam input pipeline inlet and steam output pipeline outlet on the outside of the acid and alkali resistant brick cofferdam, and steam traps are fixedly installed on the steam output pipeline on the outside of the acid and alkali resistant brick cofferdam.

7. The glacial acetic acid recovery tank according to claim 1, 2, 4, or 6, characterized in that... Each support frame has a fixed pad at its bottom, and the pads are fixed to the acid and alkali resistant brick floor with anchor bolts.

8. The glacial acetic acid recovery tank according to claim 7, characterized in that... A sewage drain is installed on the acid and alkali resistant brick floor, and a filter screen cover is installed at the inlet of the sewage drain; or / and, a sewage pipeline is fixedly connected between the bottom wall of the box and the inlet of the sewage drain, and the outlet diameter of the sewage pipeline is smaller than the inlet diameter of the sewage drain; or / and, a sewage valve is fixedly installed on the sewage pipeline.

9. The glacial acetic acid recovery tank according to claim 8, characterized in that... A sight glass is fixedly installed on the side wall of the enclosure; or / and a temperature gauge is fixedly installed on the enclosure.

10. A device for recovering residual glacial acetic acid after unloading, using the glacial acetic acid recovery tank according to any one of claims 1 to 9, characterized in that... The system includes acetic acid tank trucks, unloading arms, collection tanks, and acetic acid recovery boxes. The unloading area for the acetic acid tank trucks is equipped with an acid- and alkali-resistant parking area. An acetic acid drain line is fixedly connected between the bottom outlet of the acetic acid tank on the tank truck and the inlet of the unloading arms. A drain line is fixedly connected to the acetic acid drain line, and a collection tank is located below the outlet of the drain line. A three-way valve is fixedly installed on the drain line. A residual liquid conveying line is fixedly connected between the right outlet of the three-way valve and the inlet of the feed line. A public steam network branch line is fixedly connected to the left inlet of the steam input line. A pressure reducing valve and a pressure gauge are fixedly installed sequentially along the flow direction of the medium on the public steam network branch line. A condensate discharge branch line is fixedly connected to the right outlet of the steam output line. An acetic acid conveying line is fixedly connected to the outlet of the discharge line, and a conveying pump is fixedly installed on the acetic acid conveying line.

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