Washing tower for high-activity recovery of synthetic acetic acid selective washing catalyst
By designing a scrubber for high-activity recovery of synthetic acetic acid selective washing catalyst, using vacuum pump pumping, pressurized module atomization spraying and filter plate separation technology, the problem of catalyst cannot be recovered is solved, and efficient catalyst recovery and cost reduction effect is achieved.
Patent Information
- Application Number
- CN202510468410.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2025-07-11
AI Technical Summary
During the existing acetic acid production process, the catalyst cannot be effectively recovered in the scrubber, resulting in excessive use of the catalyst and increasing production costs.
A scrubber for high activity recovery of synthetic acetic acid selective washing catalyst is designed, including main tower, sub-tower tower, connecting tower, vacuum module, liquid supply module and other components. The gas in the tower is extracted through a vacuum pump, the booster module is sprayed, and the spraying tower plate atomization spray head is atomized to the washing liquid, and the countercurrent contact with the crude acetic acid gas is made by the filter plate intercepting the catalyst particles to realize the countercurrent separation of gas and liquid.
It improves the catalyst recovery efficiency, reduces catalyst loss, reduces water supply pump load, saves energy and consumes, reduces production costs, and improves reaction rate and market competitiveness.
Smart Images
Figure CN120285714A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of acetic acid preparation, and particularly relates to a washing tower for highly active recovery of a synthetic acetic acid selective washing catalyst. Background Art
[0002] Acetic acid, also known as ethanoic acid, is the simplest organic monobasic weak acid except formic acid. It is a colorless liquid with a pungent odor at room temperature and normal pressure. It can be miscible with organic solvents such as water, ethanol, ether, and carbon tetrachloride. It is often represented by the symbol HOAc or HAc and is widely used in the food industry, chemical industry, pharmaceutical industry, etc. The commonly used production methods are fermentation method and chemical synthesis method.
[0003] Currently, when acetic acid is produced by the low-pressure carbonylation method of methanol, methanol and carbon monoxide are synthesized into acetic acid under certain temperature, pressure and catalyst conditions, and qualified products are produced after rectification and purification. However, during the production process of the acetic acid plant, while the crude acetic acid product is synthesized, the catalyst will go to the rectification area together with the flash evaporation. After the crude acetic acid flashes out, it will first enter the selective washing tower to recover the catalyst and return it to the system to ensure the normal operation of the system. In actual operation, it is impossible to recover all these catalysts, which will cause an increase in the amount of catalyst used and an increase in the cost of acetic acid. With the rising price of acetic acid catalysts in recent years and the continuous fluctuation of acetic acid product prices, the product cost problem has also become an issue that cannot be ignored by each company. Therefore, how to recover the catalyst substances flashed into the rectification area after synthesis to improve the synthesis reaction efficiency, reduce catalyst consumption, reduce the cost of acetic acid, and enhance the market competitiveness of the enterprise requires improvement of the existing washing tower for acetic acid production. Therefore, the present application provides a washing tower for highly active recovery of a synthetic acetic acid selective washing catalyst to meet the requirements. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide a washing tower for highly active recovery of a synthetic acetic acid selective washing catalyst to solve the problem that in the existing acetic acid production process, the catalyst cannot be well recovered in the washing tower, resulting in excessive catalyst usage and increased production costs.
[0005] To solve the above technical problems, the present invention provides the following technical solutions:
[0006] A scrubbing tower for highly active recovery of a synthetic acetic acid selective scrubbing catalyst, comprising a main tower, a secondary tower is provided above the main tower, a connecting tower is provided between the main tower and the secondary tower, a vacuum module is connected to the left side of the main tower, a liquid supply module is connected to the rear side of the main tower, a storage tank is provided on the right side below the main tower, a flash tank is connected to the right side of the storage tank, a spray tray is longitudinally provided inside the main tower, a pressurization module is provided at the lower end inside the connecting tower, a central riser is connected to the lower end of the connecting tower, a spraying module is longitudinally provided at the outer end of the central riser, a pressure monitoring module is connected between the main tower and the storage tank, and an air extraction pipe is provided between the vacuum module and the main tower and the secondary tower.
[0007] Optionally, the main tower includes a lower tower body, a detachable window, cavity air holes, a heat dissipation fan, a bottom liquid tank and an atomization cavity. A detachable window is longitudinally opened on the front side of the outer end of the lower tower body, cavity air holes are longitudinally opened on the left side of the outer end of the lower tower body, a heat dissipation fan is provided above the right side of the outer end of the lower tower body, a bottom liquid tank is provided at the lower end inside the lower tower body, and an atomization cavity is provided above the bottom liquid tank.
[0008] Optionally, the secondary tower includes an upper tower body, a separation tray, a filter plate, a liquid inlet and an air extraction hole. A separation tray is longitudinally provided inside the upper tower body, a filter plate is provided at the lower end of the separation tray, a liquid inlet is opened above the rear side of the outer end of the upper tower body, and an air extraction hole is opened above the left side of the outer end of the upper tower body.
[0009] Optionally, the connecting tower includes a conical tower body, an embedded support, an inner conical frame, a sleeve, a side pipe and a bottom conical pipe. An embedded support is provided at the lower end inside the conical tower body, an inner conical frame is provided at the upper end of the embedded support, a sleeve is provided inside the inner conical frame, a side pipe is opened below the right side of the outer end of the sleeve, and a bottom conical pipe is provided at the lower end of the sleeve.
[0010] Optionally, the vacuum module includes a vacuum box, a vacuum pump, a pressure gauge, an L-shaped pipe and an exhaust valve. A vacuum pump is provided at the left rear side of the upper end of the vacuum box, a pressure gauge is connected to the right side of the lower end of the vacuum pump, an L-shaped pipe is connected to the right side of the pressure gauge, and an exhaust valve is provided on the left side of the outer end of the vacuum box.
[0011] Optionally, the liquid supply module includes a water tank, a water supply pump, a stirring motor, a feeding port, a liquid supply pipe, a water return port, a water inlet and a slag discharge port. A water supply pump is provided above the front end of the water tank, a stirring motor is provided in the middle of the upper end of the water tank, a feeding port is opened on the right side of the stirring motor, a liquid supply pipe is connected to the front end of the water supply pump, a water return port is opened on the lower left side of the front end of the water tank, a water inlet is opened above the left side of the outer end of the water tank, and a slag discharge port is opened below the water inlet.
[0012] Optionally, the spray tray includes a splicing plate, an overflow trough, a downcomer, valve plates, and a middle perforation. An overflow trough is provided on the right side of the upper end of the splicing plate. A downcomer is provided at the lower end on the left side of the splicing plate. Valve plates are distributed in a rectangular shape on the inner side of the middle of the upper end of the splicing plate. A middle perforation is provided in the middle of the upper end of the splicing plate.
[0013] Optionally, the pressurization module includes a housing, a supercharging turbine, a supercharging motor, a power connection terminal, and a perforated mesh. A supercharging turbine is provided inside the housing. A supercharging motor is provided in the middle of the upper end of the housing. A power connection terminal is provided above the front end of the supercharging motor. A perforated mesh is provided on the inner side of the upper end of the housing.
[0014] Optionally, the spraying module includes a reinforcing ring, a mounting ring, diagonal rods, atomizing nozzles, and reinforcing screws. A mounting ring is provided below the reinforcing ring. Diagonal rods are provided between the reinforcing ring and the mounting ring. Atomizing nozzles are distributed annularly at the lower end of the reinforcing ring. Reinforcing screws are provided on the upper and lower sides of the outer end of the reinforcing ring.
[0015] Optionally, the pressure monitoring module includes a sealed housing, a docking pipe head, a pressure measuring pipe, a pressure monitor, a pressure gauge, and a warning light. A docking pipe head is provided inside the sealed housing. A pressure measuring pipe is connected to the right side of the outer end of the sealed housing. A pressure monitor is provided at the front end of the pressure measuring pipe. A pressure gauge is provided above the pressure monitor. A warning light is provided below the pressure monitor.
[0016] Compared with the prior art, the present invention has at least the following beneficial effects:
[0017] In the above solution, through the provided pressurization module, the washing liquid can be pressurized and injected into the central riser. Since the bottom of the central riser is closed, only the spraying module connected to it can allow the washing liquid to flow in. Under the action of pressure, after entering the spraying module, the washing liquid is sprayed in an atomized manner by the atomizing nozzles, fully filling the atomization cavity opened inside the main tower, forming a larger gas-liquid mass transfer interface. When the gas-liquid two-phase flows in countercurrent contact, the catalyst components in the crude acetic acid gas are transferred from the gas phase to the liquid phase through diffusion, realizing more complete separation. After subsequent countercurrent separation of the gas-liquid two-phase in the four-layer atomization cavity, the recovery efficiency of the catalyst will be higher.
[0018] Through the provided filter plate, before the washing liquid contacts and separates the catalyst from the crude acetic acid gas liquid through the separation tray, filtration is first performed to intercept the catalyst particles or the catalyst in the crude acetic acid gas that has been separated by the main tower. Then, the gas passes through the separation tray and undergoes gas-liquid contact mass transfer separation with the washing liquid flowing above, increasing the recovery amount of the catalyst and reducing losses.
[0019] By setting up a vacuum pump, the excess gas inside the main tower and the auxiliary tower can be extracted before the catalyst recovery work is carried out, so that a vacuum negative pressure environment is formed inside the main tower and the auxiliary tower. After that, when the washing liquid and the crude acetic acid gas are in gas-liquid two-phase countercurrent contact, on the one hand, the pressure is reduced to accelerate the movement speed of the catalyst molecules in the gas, making it easier to diffuse to the gas-liquid interface and be absorbed by the washing liquid; on the other hand, the solubility of the gas under vacuum conditions increases. According to Henry's law, the solubility of a gas in a liquid is proportional to the partial pressure of the gas in the gas phase. Vacuuming reduces the partial pressure of each component in the gas phase, thereby increasing the solubility of the catalyst in the washing liquid, further promoting the mass transfer process, and improving the recovery effect of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.
[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;
[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the main tower, auxiliary tower and connecting tower of the present invention;
[0023] Figure 3 It is a schematic diagram of the three-dimensional explosion structure of the main tower, connecting tower, booster module, central riser and spray module of the present invention;
[0024] Figure 4 This is a schematic diagram of the three-dimensional explosion structure of the separation tower plate and the filter plate of the present invention;
[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the vacuum module of the present invention;
[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the liquid supply module of the present invention;
[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the spray tower plate of the present invention;
[0028] Figure 8 This is a schematic diagram of the three-dimensional cross-sectional structure of the boost module of the present invention when viewed from above;
[0029] Figure 9 The present invention is attached Figure 2 A schematic diagram of the partially enlarged structure at center A;
[0030] Figure 10 It is a schematic diagram of the three-dimensional separation structure of the pressure monitoring module of the present invention.
[0031] Reference numerals:
[0032] 1. Main tower; 2. Auxiliary tower; 3. Connecting tower; 4. Vacuum module; 5. Liquid supply module; 6. Storage tank; 7. Flash tank; 8. Spray tray; 9. Boosting module; 10. Central riser; 11. Spraying module; 12. Pressure monitoring module; 13. Suction pipe; 101. Lower tower body; 102. Removable viewing window; 103. Chamber air hole; 104. Radiator fan; 105. Bottom liquid tank; 106. Atomization chamber; 201. Upper tower body; 202. Separation tray; 203. Filter plate; 204. Liquid inlet; 205. Suction hole; 301. Conical tower body; 302. Embedded support; 303. Inner cone frame; 304. Sleeve; 305. Side pipe; 306. Bottom cone pipe; 401. Vacuum box; 402. Vacuum pump; 403. Pressure gauge; 404. L-shaped pipe; 405. Exhaust valve; 501. Water tank; 502. Water supply pump; 503. Stirring motor; 504. Feeding port; 505. Liquid supply pipe; 506. Water return port; 507. Water inlet; 508. Slag discharge port; 801. Splice plate; 802. Overflow tank; 803. Downcomer; 804. Valve disc; 805. Middle perforation; 901. Housing; 902. Boosting turbine; 903. Boosting motor; 904. Power connection terminal; 905. Hollow net; 111. Reinforcing ring; 112. Mounting ring; 113. Diagonal rod; 114. Atomizing nozzle; 115. Reinforcing screw; 121. Sealing shell; 122. Docking pipe head; 123. Pressure measuring pipe; 124. Pressure monitor; 125. Pressure gauge; 126. Warning lamp.
[0033] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for schematic needs and is not intended to limit the present invention to this specific structure, device, and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments. Detailed implementation manners
[0034] The following describes in detail a scrubbing tower for highly active recovery of a synthetic acetic acid selective scrubbing catalyst provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also implement them in other alternative ways; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.
[0035] It should be noted that in the specification, the mention of "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. indicates that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. Additionally, when describing a specific feature, structure or characteristic in combination with an embodiment, the implementation of such feature, structure or characteristic in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.
[0036] Generally, terms can be understood, at least in part, from their use in the context. For example, at least in part depending on the context, the term "one or more" as used herein can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, at least in part depending on the context, to allow for the existence of other factors that are not necessarily explicitly described.
[0037] It can be understood that the meanings of "on", "above" and "over" in the present invention should be interpreted in the broadest manner, such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.
[0038] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device may be oriented in other ways, and the spatial relative descriptors used herein may be similarly interpreted accordingly.
[0039] As Figures 1 to 10As shown, an embodiment of the present invention provides a scrubbing tower for highly active recovery of a synthetic acetic acid selective scrubbing catalyst, including a main tower 1. A secondary tower 2 is provided above the main tower 1. The lower end of the secondary tower 2 extends into the interior of a connecting tower 3. The main tower 1 and the secondary tower 2 are welded and assembled into an integral structure through the connecting tower 3. External brackets can also be installed among the three. A connecting tower 3 is provided between the main tower 1 and the secondary tower 2. The lower end of the connecting tower 3 extends into the interior of the top of the main tower 1 and is welded and fixed. Among them, the internal diameter of the upper end of the connecting tower 3 matches the external diameter of the lower end of the secondary tower 2, and the overall diameter of the lower end of the connecting tower 3 is adapted to the internal diameter of the upper end of the main tower 1. A vacuum module 4 is connected to the left side of the main tower 1. The vacuum module 4 is connected to the main tower 1 and the secondary tower 2 through a suction pipe 13. A liquid supply module 5 is connected to the rear side of the main tower 1. The liquid supply module 5 is connected to the secondary tower 2. A storage tank 6 is provided on the right side below the main tower 1. The storage tank 6 is connected to the main tower 1 through a pressure monitoring module 12. A flash tank 7 is connected to the right side of the storage tank 6. A spray tray 8 is longitudinally installed inside the main tower 1. There are four spray trays 8 longitudinally distributed, and the installation spacing between each two is equal. A pressurization module 9 is embedded and installed at the lower end inside the connecting tower 3. A central riser 10 is connected to the lower end of the connecting tower 3. A spraying module 11 is bolted to the outer end of the central riser 10. Among them, four groups of spraying modules 11 are longitudinally installed. The spraying module 11 is connected to the central riser 10. A pressure monitoring module 12 is connected between the main tower 1 and the storage tank 6. A suction pipe 13 is connected between the vacuum module 4 and the main tower 1 and the secondary tower 2.
[0040] Through the provided vacuum module 4, before the crude acetic acid vapor enters the main tower 1 and the secondary tower 2 for operation, the air inside the main tower 1 and the secondary tower 2 can be pumped out, ensuring that the main tower 1 and the secondary tower 2 are in a vacuum negative pressure state during the catalyst recovery work. After the internal gas extraction is completed, the washing liquid is injected into the liquid supply module 5, allowing the detergent and water to start mixing and diluting inside the liquid supply module 5. Then, the diluted washing liquid is pumped out and supplied to the secondary tower 2, entering the tower through the liquid inlet 204 opened at the upper end of the secondary tower 2. After that, it overflows layer by layer along the separation trays 202 installed longitudinally inside. When the washing liquid flows to the bottom of the secondary tower 2, it enters the connecting tower 3 and is then transported downward through the sleeve 304 installed inside to the bottom cone pipe 306. At this time, the pressurization module 9 located in the bottom cone pipe 306 starts to work, pressurizing the washing liquid and injecting it into the central riser 10. Since the bottom of the central riser 10 is closed and only the spraying module 11 connected to it can allow the washing liquid to flow in, under the action of pressure, it is discharged from the longitudinally installed spraying module 11. And because the atomizing nozzles 114 are installed in the spraying module 11, the washing liquid is sprayed in an atomized manner, fully filling the atomization chamber 106 opened inside the main tower 1. The condensed atomized washing liquid accumulates above the spray trays 8. When the accumulated washing liquid is too much, it overflows downward along the overflow trough 802 and downcomer 803 provided on the spray trays 8 until it flows into the bottom liquid tank 105 and then enters the liquid supply module 5 through the connected pipeline, thus completing the circulation of the washing liquid. Then, the crude acetic acid gas produced inside the flash tank 7 is released, enters the storage tank 6 through the connected pipeline, and then enters the inside of the main tower 1 through the pressure monitoring module 12 connecting the main tower 1 and the storage tank 6. When the crude acetic acid gas enters the inside of the main tower 1 and when too much crude acetic acid gas enters, under the action of the internal air pressure, it will lift the valve plate 804 installed in the middle of the upper spray trays 8 above. After that, when the crude acetic acid gas enters the atomization chamber 106, it first contacts the washing liquid accumulated on the spray trays 8, and then contacts the atomized washing liquid sprayed out. Since the washing liquid has been atomized in the atomization chamber 106, when the crude acetic acid gas enters, a larger gas-liquid mass transfer interface will be formed, and the gas-liquid two-phase flows in countercurrent contact. The catalyst components in the crude acetic acid gas are transferred from the gas phase to the liquid phase through diffusion, achieving more sufficient separation. After the gas-liquid two-phase countercurrent separation in the four-layer atomization chamber 106, the crude acetic acid gas with residual catalyst will pass through the connecting tower 3 through the air holes opened on the sleeve 304 and enter the secondary tower 2, and then through the multi-layer installed filter plates 203 and separation trays 202 inside the secondary tower 2 for further gas-liquid two-phase countercurrent contact separation, thereby separating the catalyst components in the crude acetic acid gas and achieving the maximum catalyst recovery effect, thus reducing the synthesis loss of the catalyst. Secondly, by changing the washing liquid, the load of the water supply pump 502 can be reduced, saving energy and reducing consumption. Compared with the existing washing tower, on the one hand, the reaction rate can be increased, and on the other hand, the frequency of catalyst supplementation can be reduced.Reduce production costs and improve competitiveness.
[0041] As Figures 1 to 3 shown, the main tower 1 includes a lower tower body 101, a detachable window 102, cavity air holes 103, a heat dissipation fan 104, a bottom liquid tank 105 and an atomization cavity 106. A detachable window 102 is longitudinally provided on the front side of the outer end of the lower tower body 101. Cavity air holes 103 are longitudinally provided on the left side of the outer end of the lower tower body 101. A heat dissipation fan 104 is provided above the right side of the outer end of the lower tower body 101. A bottom liquid tank 105 is provided at the lower end inside the lower tower body 101, and an atomization cavity 106 is provided above the bottom liquid tank 105.
[0042] Four detachable windows 102 are longitudinally provided on the front side of the outer end of the lower tower body 101, and the detachable windows 102 are hermetically installed with the lower tower body 101. Four cavity air holes 103 are longitudinally provided on the left side of the outer end of the lower tower body 101. The opening height of the cavity air holes 103 is equal to the opening height of the detachable windows 102, and both are located in the middle region of the longitudinal height of the atomization cavity 106. A heat dissipation channel is provided at the position of the heat dissipation fan 104 in the main tower 1, and the heat dissipation channel communicates with a side pipe 305 provided inside the connecting tower 3, facilitating heat dissipation of the booster motor 903 in the booster module 9. The upper end structure of the bottom liquid tank 105 is sealed at the contact position with the inside of the main tower 1. At the same time, two pipelines are provided at the lower end of the bottom liquid tank 105. One pipeline communicates with the liquid supply module 5, facilitating the subsequent recovery of the washing liquid and the catalyst, and the other pipeline communicates with the storage tank 6 to inject crude acetic acid gas into the inside. Four atomization cavities 106 are longitudinally provided. The cavity sizes inside the four atomization cavities 106 are only different in the top atomization cavity 106, and the cavities of the remaining three atomization cavities 106 are equal.
[0043] By providing the detachable window 102, it can be regularly disassembled to allow maintenance personnel to enter the inside of the lower tower body 101 to maintain and replace the valve pieces 804 in the spray tray 8 inside and the atomizing nozzles 114 in the spraying module 11. The design of the cavity air holes 103 can extract gas from the inside of the main tower 1 and the auxiliary tower 2, ensuring that when recovering the catalyst, the inside of the lower tower body 101 and the upper tower body 201 is in a vacuum-like environment, which can reduce the pressure inside the washing tower. According to the relationship between boiling point and pressure, the reduction of pressure will also lower the boiling point of the liquid, which helps the catalyst and the crude acetic acid gas to be more easily separated using a detergent at a lower temperature, improving the efficiency and quality of catalyst recovery.
[0044] As Figures 2 to 4As shown in the figure, the auxiliary tower 2 includes an upper tower body 201, a separation tray 202, a filter plate 203, a liquid inlet 204, and an air extraction hole 205. Inside the upper tower body 201, a separation tray 202 is longitudinally arranged. A filter plate 203 is provided at the lower end of the separation tray 202. An air extraction hole 205 is opened above the rear side of the outer end of the upper tower body 201. The function of the liquid inlet 204 is to inject the diluted washing liquid into the interior. An air extraction hole 205 is opened above the left side of the outer end of the upper tower body 201. The function of the air extraction hole 205 is to extract the gas inside the auxiliary tower 2 before catalyst recovery.
[0045] A longitudinal maintenance window is also opened at the outer end of the upper tower body 201. The maintenance window is sealed with the upper tower body 201, and the opening angle of the maintenance window is the same as the layout angle of the ladder. The position where the maintenance window is opened on the upper tower body 201 is similar to that of the lower tower body 101, both located at the middle height position of the cavity separated by two separation trays 202. Among them, the separation trays 202 inside the upper tower body 201 are installed at alternating left and right angles. At the same time, a filter plate 203 is bolted to the middle of the lower end of each separation tray 202. A detachable polytetrafluoroethylene filter cloth is installed inside the filter plate 203. Moreover, the maintenance of both the filter plate 203 and the separation tray 202 can be carried out by entering the cavity isolated inside the upper tower body 201 through the maintenance window. Secondly, a separate valve plate is provided at the top end inside the upper tower body 201. The purpose of this valve plate is that when the vacuum inside the upper tower body 201 is extracted, the cavity below the valve plate is in negative pressure, while the air pressure above the valve plate is higher than that of the cavity below. The air pressure presses the valve plate to close, and no gas from the upper end will enter the working cavity inside the upper tower body 201.
[0046] Through the provided filter plate 203, before the washing liquid contacts the crude acetic acid gas liquid to separate the catalyst through the separation tray 202, filtration is first carried out to intercept the catalyst particles or catalyst in the crude acetic acid gas that has been separated by the main tower 1. Then the gas passes through the separation tray 202 and undergoes gas-liquid contact mass transfer separation with the washing liquid flowing above, increasing the catalyst recovery amount and reducing losses.
[0047] As Figure 2 and Figure 3 As shown in the figure, the connecting tower 3 includes a conical tower body 301, an embedded support 302, an inner conical frame 303, a sleeve 304, a side pipe 305, and a bottom conical pipe 306. An embedded support 302 is provided at the lower end inside the conical tower body 301. An inner conical frame 303 is provided at the upper end of the embedded support 302. A sleeve 304 is provided inside the inner conical frame 303. A side pipe 305 is opened below the right side of the outer end of the sleeve 304. A bottom conical pipe 306 is provided at the lower end of the sleeve 304.
[0048] The upper and lower ends of the conical tower body 301 are both sealed and welded to the contact ends of the main tower 1 and the auxiliary tower 2. The embedded support 302 is integrally cast with the conical tower body 301. At the same time, a threaded hole is provided in the middle of the lower end of the embedded support 302 to facilitate the reinforcement after the installation of the inner conical frame 303. The outer end of the inner conical frame 303 fits against the inner wall of the conical tower body 301. The inner conical frame 303 and the sleeve 304 are reinforced together by bolts. The sleeve 304 is composed of a thick end and a thin end. Holes for gas passage are symmetrically provided on the outer side of the thicker upper end. And a sealing pipe is provided inside the thinner lower end. The overall length of the sealing pipe is twice the overall length of the booster motor 903. At the same time, a side pipe 305 is connected to the right side of the outer wall of the thinner end of the sleeve 304. The sealing pipe and the side pipe 305 are interconnected. And the side pipe 305 is interconnected with the heat dissipation channel opened at the position where the heat dissipation fan 104 is installed on the outer end of the main tower 1. Among them, the inside of the sealing pipe is of a hollow structure and only has an opening at the lower end, and the upper end is a closed structure. Its main function is to cover the booster motor 903 in the lower booster module 9 to ensure that the booster motor 903 is isolated from the external washing liquid during operation. Secondly, the heat generated by the operation of the booster motor 903 will be discharged to the heat dissipation channel through the side pipe 305 interconnected with the sealing pipe. The upper end of the bottom cone pipe 306 extends to the inside of the lower end of the sleeve 304, and the lower end of the sleeve 304 extends to the circular structure at the lower end of the inner conical frame 303. The three are reinforced by bolts, and the booster module 9 is installed and fixed inside the upper end of the bottom cone pipe 306.
[0049] By providing the conical tower body 301, it can be used to connect the main tower 1 and the auxiliary tower 2 to form an integral washing tower structure. The function of the embedded support 302 is to install and fix the inner conical frame 303. The function of the inner conical frame 303 is to increase the internal support force of the conical tower body 301 and fix the sleeve 304. Through the function of the sleeve 304, it is used to connect the auxiliary tower 2 and the bottom cone pipe 306 to make the internal cavities of the three interconnected. The design of the bottom cone pipe 306 is to connect the sleeve 304 and the central riser 10, and to install and fix the booster module 9 inside.
[0050] As Figure 1 、 Figure 2 and Figure 5 shown, the vacuum module 4 includes a vacuum box 401, a vacuum pump 402, a pressure gauge 403, an L-shaped pipe 404 and an exhaust valve 405. A vacuum pump 402 is provided on the left rear side of the upper end of the vacuum box 401. The right side of the lower end of the vacuum pump 402 is connected to a pressure gauge 403. The right side of the pressure gauge 403 is connected to an L-shaped pipe 404. An exhaust valve 405 is provided on the left side of the outer end of the vacuum box 401.
[0051] The lower end of the vacuum pump 402 extends to the right region inside the vacuum chamber 401 for fixation, while an air chamber is formed in the left region inside the vacuum chamber 401. The air chamber is interconnected with the vacuum pump 402, and the vacuum pump 402 is connected to the pressure gauge 403 through a pipeline. An L-shaped pipe 404 is hermetically installed at the front end of the pressure gauge 403. The L-shaped pipe 404 is used to connect the air extraction pipe 13 and the pressure gauge 403. The exhaust valve 405 is interconnected with the air chamber inside the vacuum chamber 401 and is used to discharge the gas stored in the air chamber.
[0052] By setting the vacuum pump 402, before the catalyst recovery work, the excess gas inside the main tower 1 and the secondary tower 2 can be evacuated, creating a vacuum negative pressure environment inside the main tower 1 and the secondary tower 2. When the washing liquid and the crude acetic acid gas undergo countercurrent gas-liquid contact, on the one hand, reducing the pressure increases the movement speed of the catalyst molecules in the gas, making it easier for them to diffuse to the gas-liquid interface and be absorbed by the washing liquid. On the other hand, the solubility of the gas increases under vacuum conditions. According to Henry's law, the solubility of a gas in a liquid is proportional to the partial pressure of the gas in the gas phase. Evacuating the vacuum reduces the partial pressure of each component in the gas phase, thereby increasing the solubility of the catalyst in the washing liquid and further promoting the mass transfer process and improving the catalyst recovery effect.
[0053] As Figure 1 、 Figure 2 and Figure 6 shown, the liquid supply module 5 includes a water tank 501, a water supply pump 502, a stirring motor 503, a feeding port 504, a liquid supply pipe 505, a water return port 506, a water inlet 507, and a slag discharge port 508. The water supply pump 502 is provided above the front end of the water tank 501, the stirring motor 503 is provided in the middle of the upper end of the water tank 501, the feeding port 504 is opened on the right side of the stirring motor 503, the liquid supply pipe 505 is connected to the front end of the water supply pump 502, the water return port 506 is opened on the lower left side of the front end of the water tank 501, the water inlet 507 is opened above the left side of the outer end of the water tank 501, and the slag discharge port 508 is opened below the water inlet 507.
[0054] The water tank 501 is composed of a large box body and a small box body at the front end. The cavities inside the large box body and the small box body are interconnected, and a filter screen is provided at the contact end of the mutual cavities to filter small particles in the washing liquid and prevent particulate matter from entering the water supply pump 502. The water supply pump 502 is installed at the upper end of the small box body. The water supply pump 502 is interconnected with the liquid supply pipe 505. The design of the feeding port 504 can inject the detergent used for recycling the catalyst into the interior. Then, through the provided stirring motor 503, the detergent is stirred and mixed with the water flow inside the water tank 501 to form a diluted washing liquid for recycling the catalyst. The water return port 506 is connected to the bottom liquid tank 105 provided inside the main tower 1 through a pipeline for the recovery of the washing liquid. The design of the water inlet 507 facilitates the injection of water flow and detergent into the water tank 501 for mixing. Through the provided slag discharge port 508, the liquid inside the water tank 501 can be discharged.
[0055] As Figure 2 and Figure 7 shown, the spray tray 8 includes a splicing plate 801, an overflow trough 802, a downcomer 803, valve plates 804, and a middle perforation 805. An overflow trough 802 is opened on the right side of the upper end of the splicing plate 801. A downcomer 803 is provided at the lower end on the left side of the splicing plate 801. The valve plates 804 are distributed in a rectangular shape on the inner side of the middle part of the upper end of the splicing plate 801. A middle perforation 805 is opened in the middle part of the upper end of the splicing plate 801.
[0056] The splicing plate 801 is composed of three structures on the left, middle, and right, and the three structures can be disassembled from each other. Among them, the downcomer 803 is installed on the inner side of the left structure. The valve plates 804 are arranged in a rectangular shape at the upper end of the middle structure. And a middle perforation 805 is opened in the middle part of the middle structure. The inner diameter of the middle perforation 805 is adapted to the outer diameter of the central riser 10, and a sealing treatment is performed at the contact end of the two. An overflow trough 802 is opened at the upper end of the right structure.
[0057] As Figure 2 、 Figure 3 and Figure 8 shown, the pressurization module 9 includes a housing 901, a pressurization turbine 902, a pressurization motor 903, a power connection end 904, and a hollowed-out net 905. The pressurization turbine 902 is provided inside the housing 901. The pressurization motor 903 is provided in the middle of the upper end of the housing 901. The power connection end 904 is provided above the front end of the pressurization motor 903. The hollowed-out net 905 is provided on the inner side of the upper end of the housing 901.
[0058] The supercharging turbine 902 is reinforced with cross bars distributed in a ring between the inner wall of the upper end of the housing 901. And a hollowed-out net 905 is laid above the cross bars distributed in a ring to facilitate the washing liquid to enter the lower cavity. When the washing liquid enters the lower cavity, the supercharging motor 903 drives the supercharging turbine 902 to work, generating a spiral thrust on the washing liquid in the cavity, increasing the speed of the washing liquid entering the central riser 10 and the spraying module 11, thereby achieving the effect of increasing the pressure on the washing liquid.
[0059] As Figure 2 , Figure 3 and Figure 9 shown, the spraying module 11 includes a reinforcing ring 111, a mounting ring 112, diagonal bars 113, atomizing nozzles 114 and reinforcing screws 115. A mounting ring 112 is provided below the reinforcing ring 111. Diagonal bars 113 are provided between the reinforcing ring 111 and the mounting ring 112. Atomizing nozzles 114 are distributed in a ring at the lower end of the reinforcing ring 111. Reinforcing screws 115 are provided on the upper and lower sides of the outer end of the reinforcing ring 111.
[0060] The reinforcing ring 111 and the mounting ring 112 are fixed by the diagonal bars 113, and the three form an integral structure. Among them, the upper and lower ends of the reinforcing ring 111 are fixedly installed on the outer wall of the central riser 10 through the reinforcing screws 115. A ring-shaped conveying pipe is laid inside the mounting ring 112. Four diagonal bars 113 are symmetrically distributed. And inclined conveying pipes are laid inside the four diagonal bars 113. The upper ends of the four inclined conveying pipes pass through the reinforcing ring 111 and extend into the interior of the central riser 10, while the lower ends of the four inclined conveying pipes are interconnected with the ring-shaped conveying pipe inside the mounting ring 112. Atomizing nozzles 114 are distributed in a ring at the lower end of the mounting ring 112. The upper ends of the atomizing nozzles 114 are interconnected with the ring-shaped conveying pipe laid inside the mounting ring 112.
[0061] By setting the atomizing nozzles 114, the washing liquid in the central riser 10 can be injected into the atomizing nozzles 114 through the inclined conveying pipes inside the diagonal bars 113 and the ring-shaped conveying pipe inside the mounting ring 112. Under the action of the special flow channel and nozzle structure inside the nozzle by the atomizing nozzles 114, the washing liquid is sprayed out at a high speed from the nozzle, forming an atomizing effect, enabling the washing liquid to make a gas-liquid two-phase countercurrent contact with the crude acetic acid gas, forming a larger gas-liquid mass transfer interface, promoting the dissolution and absorption of the catalyst and the washing liquid, and improving the recovery efficiency of the catalyst.
[0062] As Figure 2 and Figure 10As shown in the figure, the pressure monitoring module 12 includes a sealing shell 121, a docking pipe head 122, a pressure measuring pipe 123, a pressure monitor 124, a pressure gauge 125 and a warning light 126. The docking pipe head 122 is arranged inside the sealing shell 121. The right side of the outer end of the sealing shell 121 is communicated with the pressure measuring pipe 123. The pressure monitor 124 is arranged at the front end of the pressure measuring pipe 123. The pressure gauge 125 is arranged at the upper end of the pressure monitor 124. The warning light 126 is arranged at the lower end of the pressure monitor 124.
[0063] By arranging the docking pipe head 122, it is installed in the middle area of the connecting pipeline between the main tower 1 and the storage tank 6. After that, the sealing shell 121 is installed outside the docking pipe head 122. When the device starts to work after the installation of the sealing shell 121 is completed, when the pressure in the cavity between the sealing shell 121 and the docking pipe head 122 changes, it can be known that the docking pipe head 122 is leaking. At this time, the pressure monitor 124 will drive the warning light 126 to emit an alarm to remind the production personnel to deal with it in time.
[0064] The working principle of the technical solution provided by the present invention is as follows:
[0065] The washing tower for highly active recovery of the synthesized acetic acid selective washing catalyst can, through the provided vacuum module 4, extract the air inside the main tower 1 and the secondary tower 2 before the crude acetic acid vapor enters the main tower 1 and the secondary tower 2 for operation, ensuring that the main tower 1 and the secondary tower 2 are in a vacuum negative pressure state during the catalyst recovery work inside. After the internal gas extraction is completed, the washing liquid is injected into the liquid supply module 5, and the detergent and water start to be mixed and diluted inside the liquid supply module 5. Then, the diluted washing liquid is extracted and supplied to the secondary tower 2, entering the tower through the liquid inlet 204 opened at the upper end of the secondary tower 2, and then flowing down layer by layer along the separation trays 202 installed longitudinally inside. When the washing liquid flows to the bottom of the secondary tower 2, it will enter the connecting tower 3 and be transported downward by the casing 304 installed inside to the bottom cone tube 306. At this time, the pressurization module 9 located in the bottom cone tube 306 will start to work, pressurize the washing liquid and inject it into the central riser 10. Since the bottom of the central riser 10 is closed and only the spraying module 11 connected to it can allow the washing liquid to flow in, under the action of pressure, it will be discharged from the longitudinally installed spraying module 11. And because the atomizing nozzles 114 are installed in the spraying module 11, the washing liquid will be sprayed in an atomized manner, fully filling the atomization chamber 106 opened inside the main tower 1. The condensed atomized washing liquid will accumulate above the spray trays 8. When the accumulated washing liquid is too much, it will flow down along the overflow trough 802 and the downcomer 803 provided on the spray trays 8 until it flows into the bottom liquid tank 105 and then enters the liquid supply module 5 through the connected pipeline, thus completing the circulation of the washing liquid. Then, the crude acetic acid gas produced inside the flash tank 7 is released, enters the storage tank 6 through the connected pipeline, and then enters the inside of the main tower 1 through the pressure monitoring module 12 connecting the main tower 1 and the storage tank 6. When the crude acetic acid gas enters the inside of the main tower 1, when too much crude acetic acid gas enters, under the action of the internal air pressure, it will lift the valve plate 804 installed in the middle of the upper spray trays 8 above. Then, when the crude acetic acid gas enters the atomization chamber 106, it first contacts the washing liquid accumulated on the spray trays 8, and then contacts the atomized washing liquid sprayed out. Since the washing liquid has been atomized in the atomization chamber 106, when the crude acetic acid gas enters, a larger gas-liquid mass transfer interface will be formed, and the gas and liquid phases will contact countercurrently. The catalyst components in the crude acetic acid gas will transfer from the gas phase to the liquid phase through diffusion, achieving more complete separation. After the subsequent countercurrent separation of the gas and liquid phases in the four-layer atomization chamber 106, the crude acetic acid gas with the remaining catalyst will pass through the connecting tower 3 through the air holes opened on the casing 304 and enter the secondary tower 2, and then undergo secondary countercurrent contact separation of the gas and liquid phases through the multi-layer installed filter plates 203 and separation trays 202 inside the secondary tower 2, so as to separate the catalyst components in the crude acetic acid gas and achieve the maximum recovery effect of the catalyst, thereby reducing the synthesis loss of the catalyst. Secondly, by changing the washing liquid, the load of the water supply pump 502 can be reduced, saving energy and reducing consumption.Compared with the existing scrubbing tower, it can improve the reaction rate on the one hand, reduce the replenishment frequency of the catalyst on the other hand, lower the production cost and enhance the competitiveness.
[0066] This invention covers any substitutions, modifications, equivalent methods and solutions made on the essence and scope of this invention. For the public to have a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments of this invention. However, those skilled in the art can fully understand this invention even without the description of these details. Additionally, well-known methods, processes, procedures, components and circuits are not described in detail to avoid unnecessary confusion to the essence of this invention.
[0067] The above are only the preferred embodiments of this invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of this invention.
Claims
1. A scrubbing tower for highly active recovery of a synthetic acetic acid selective scrubbing catalyst, characterized in that, It includes a main tower, with a secondary tower provided above the main tower. A connecting tower is provided between the main tower and the secondary tower. A vacuum module is connected to the left side of the main tower, and a liquid supply module is connected to the rear side of the main tower. A storage tank is provided on the right side below the main tower, and a flash tank is connected to the right side of the storage tank. A spray tray is longitudinally provided inside the main tower. A pressurization module is provided at the lower end inside the connecting tower, and a central riser is connected to the lower end of the connecting tower. A spraying module is longitudinally provided on the outer side of the central riser. A pressure monitoring module is connected between the main tower and the storage tank, and an air extraction pipe is provided between the vacuum module and the main tower and the secondary tower.
2. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, wherein The main tower includes a lower tower body, a detachable window, cavity air holes, a heat dissipation fan, a bottom liquid tank, and an atomization chamber. A detachable window is longitudinally opened on the front side of the outer end of the lower tower body. Cavity air holes are longitudinally opened on the left side of the outer end of the lower tower body. A heat dissipation fan is provided above the right side of the outer end of the lower tower body. A bottom liquid tank is provided at the lower end inside the lower tower body, and an atomization chamber is provided above the bottom liquid tank.
3. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, characterized in that, The secondary tower includes an upper tower body, a separation tray, a filter plate, a liquid inlet, and an air extraction hole. A separation tray is longitudinally provided inside the upper tower body. A filter plate is provided at the lower end of the separation tray. A liquid inlet is opened above the rear side of the outer end of the upper tower body. An air extraction hole is opened above the left side of the outer end of the upper tower body.
4. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, characterized in that, The connecting tower includes a conical tower body, an embedded support, an inner conical frame, a sleeve, a side pipe, and a bottom conical pipe. An embedded support is provided at the lower end inside the conical tower body. An inner conical frame is provided at the upper end of the embedded support. A sleeve is provided inside the inner conical frame. A side pipe is opened below the right side of the outer end of the sleeve. A bottom conical pipe is provided at the lower end of the sleeve.
5. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, wherein, The vacuum module includes a vacuum box, a vacuum pump, a pressure gauge, an L-shaped pipe, and an exhaust valve. A vacuum pump is provided at the left rear side of the upper end of the vacuum box. A pressure gauge is connected to the right side of the lower end of the vacuum pump. The pressure gauge is connected to an L-shaped pipe on the right side. An exhaust valve is provided on the left side of the outer end of the vacuum box.
6. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, characterized in that, The liquid supply module includes a water tank, a water supply pump, a stirring motor, a feeding port, a liquid supply pipe, a water return port, a water inlet, and a slag discharge port. A water supply pump is provided above the front end of the water tank. A stirring motor is provided in the middle of the upper end of the water tank. A feeding port is opened on the right side of the stirring motor. The water supply pump is connected to a liquid supply pipe at the front end. A water return port is opened on the left side below the front end of the water tank. A water inlet is opened above the left side of the outer end of the water tank. A slag discharge port is opened below the water inlet.
7. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, wherein The spray tray includes a splicing plate, an overflow trough, a downcomer, valve plates, and a middle perforation. An overflow trough is opened on the right side of the upper end of the splicing plate. A downcomer is provided at the lower end on the left side of the splicing plate. Valve plates are distributed in a rectangular shape inside the middle of the upper end of the splicing plate. A middle perforation is opened in the middle of the upper end of the splicing plate.
8. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, characterized in that, The pressurization module includes a housing, a pressurization turbine, a pressurization motor, an electrical connection end, and a perforated net. A pressurization turbine is provided inside the housing. A pressurization motor is provided in the middle of the upper end of the housing. An electrical connection end is provided above the front end of the pressurization motor. A perforated net is provided inside the upper end of the housing.
9. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, characterized in that, The spraying module includes a reinforcement ring, a mounting ring, inclined rods, atomizing nozzles and reinforcement screws. A mounting ring is provided below the reinforcement ring. Inclined rods are provided between the reinforcement ring and the mounting ring. Atomizing nozzles are annularly distributed at the lower end of the reinforcement ring. Reinforcement screws are provided on the upper and lower sides of the outer end of the reinforcement ring.
10. The scrubbing tower for highly active recovery of the synthetic acetic acid selective scrubbing catalyst according to claim 1, wherein, The pressure monitoring module includes a sealed housing, a docking pipe head, a pressure measuring pipe, a pressure monitor, a pressure gauge and a warning light. A docking pipe head is provided inside the sealed housing. A pressure measuring pipe is connected to the right side of the outer end of the sealed housing. A pressure monitor is provided at the front end of the pressure measuring pipe. A pressure gauge is provided above the pressure monitor. A warning light is provided below the pressure monitor.