Chlorination deacidification system and method for producing chlorinated toluene

Abstract

The application discloses a chlorination deacidification system for producing chlorinated toluene, which comprises a chlorination kettle, a deacidification kettle and a hydrochloric acid recovery tower, the bottom of the hydrochloric acid recovery tower is provided with recovery liquid, and the bottom of the hydrochloric acid recovery tower is provided with a rotatable adjusting shaft, a plurality of fixed rods are fixedly connected to the outer side of the adjusting shaft, the end of each fixed rod is provided with an inclined and rotatable air inlet shaft, a plurality of aeration pipes are fixedly connected to one end of the air inlet shaft, a plurality of uniformly distributed air inlets are arranged on the aeration pipes, the air inlet end of the hydrochloric acid recovery tower is provided with a communication air inlet pipe, the end of the air inlet pipe is communicated with the aeration pipe, and the upper end of the hydrochloric acid recovery tower is provided with an air outlet pipe for gas discharge. The rotating range of the aeration pipe is wider, the probability of dispersing the rising bubbles is further increased, and the hydrochloric acid recovery efficiency is improved. The application overcomes the defects of the prior art, has reasonable design, compact structure, high social use value and application prospect.

Description

Technical Field

[0001] This invention relates to the field of toluene chloride production technology, and in particular to a chlorination deacidification system and method for producing toluene chloride. Background Technology

[0002] Toluene chloride is prepared from chlorine and toluene in the presence of a catalyst. The reaction equation is as follows: .

[0003] In the preparation of toluene chloride, chlorine, catalyst and toluene need to be fully reacted in a chlorination reactor to form a chlorinated liquid, and then the chlorinated liquid is deacidified.

[0004] In the chlorination and deacidification process of toluene chloride, both the chlorination reactor and the deacidification reactor produce tail gas containing hydrogen chloride. With increasing awareness of environmental protection and the need to recover hydrogen chloride from the tail gas to achieve full energy utilization, hydrochloric acid recovery towers are used to fully absorb the hydrogen chloride gas in the tail gas. However, existing hydrochloric acid recovery towers only use a spray method to absorb hydrogen chloride from the gas using liquid. This spray method has limited efficiency in recovering hydrogen chloride, and some hydrogen chloride is easily discharged directly, which not only reduces the efficiency of hydrogen chloride recovery but also easily leads to non-compliant emissions of tail gas.

[0005] Therefore, in view of this, the inventor has studied and improved the existing structure and its shortcomings, and provided a chlorination deacidification system and method for producing chlorinated toluene, in order to achieve a more practical purpose. Summary of the Invention

[0006] To address the issue of limited hydrogen chloride recovery efficiency mentioned in the background section, which easily leads to the direct discharge of some hydrogen chloride, thus reducing recovery efficiency and causing substandard emissions, this invention provides a chlorination deacidification system and method for producing chlorotoluene.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A chlorination and deacidification system for producing chlorotoluene includes a chlorination reactor, a deacidification reactor, and a hydrochloric acid recovery tower. The discharge end of the chlorination reactor is connected to the feed end of the deacidification reactor via a pipeline. The exhaust ends of the chlorination reactor and the deacidification reactor are connected to the inlet end of the hydrochloric acid recovery tower via pipelines. The bottom of the hydrochloric acid recovery tower stores the recovered liquid, and the bottom of the hydrochloric acid recovery tower is equipped with a rotatable adjusting shaft. Multiple fixed rods are fixedly connected to the outside of the adjusting shaft. The ends of the fixed rods are all equipped with inclined and rotatable air inlet shafts. One end of the air inlet shaft is equipped with multiple fixedly connected aeration pipes. The aeration pipes are equipped with multiple evenly distributed air inlet holes. The air inlet end of the hydrochloric acid recovery tower is equipped with a connected air inlet pipe. The end of the air inlet pipe is connected to the aeration pipe. The upper end of the hydrochloric acid recovery tower is equipped with an exhaust pipe for gas discharge.

[0009] Preferably, the hydrochloric acid recovery tower has a fixedly connected base at its bottom, the adjusting shaft is rotatably mounted on the base, the base has a first helical gear in the shape of an annulus, the other end of the air intake shaft has a second helical gear that meshes with the first helical gear, the second helical gear is inclined, the end of the fixing rod has a fixedly connected sleeve, and the air intake shaft is rotatably connected inside the sleeve.

[0010] Preferably, the adjusting shaft has an annular guide ring groove inside, and an annular guide frame is provided on the outside of the adjusting shaft. The air inlet pipe is connected to the guide frame. The guide ring groove has a guide hole connected to the guide frame on the outside. The fixed rod has a connecting groove inside that is connected to the guide ring groove. The inner wall of the sleeve has an annular connecting ring groove. The connecting groove is connected to the connecting ring groove. The air inlet shaft has an air inlet groove inside. The air inlet groove is connected to the aeration pipe. The air inlet groove has a connecting hole connected to the connecting ring groove on the outside.

[0011] Preferably, the base has a drive groove, the drive groove has a drive motor, and the output end of the drive motor is connected to the adjustment shaft.

[0012] Preferably, a circulating pump is provided on one side of the hydrochloric acid recovery tower, the inlet end of the circulating pump is provided with an inlet pipe that communicates with the bottom of the hydrochloric acid recovery tower, and the outlet end of the circulating pump is provided with an outlet pipe. A spray main pipe is provided in the middle of the hydrochloric acid recovery tower, and multiple interconnected spray pipes are provided at the end of the spray main pipe. The outlet pipe is connected to the spray main pipe, and a discharge pipe for discharging material is provided on one side of the outlet pipe.

[0013] Preferably, the hydrochloric acid recovery tower is provided with a baffle plate for gas-liquid separation. A baffle column is provided in the middle of the baffle plate, and a plurality of evenly distributed partition plates are provided on the outer side of the baffle column. Each partition plate is provided with a fixedly connected adsorbent cotton layer. Between adjacent partition plates, there is a pressing plate that can move back and forth and squeeze the adsorbent cotton layer. A fixedly connected and retractable sealing plate is provided on one side of the bottom of the pressing plate below the adsorbent cotton layer.

[0014] Preferably, the inner wall of the hydrochloric acid recovery tower is provided with an annular regulating groove, the regulating ring plate is slidably connected in the regulating groove, the outer side of the tower body is provided with a fixedly connected regulating box, the inner wall of the regulating box is provided with a regulating groove communicating with the regulating groove, the outer side of the regulating ring plate is provided with a fixedly connected regulating rack, and the regulating groove is provided with a rotatable regulating gear that meshes with the regulating rack.

[0015] Preferably, the system further includes a toluene tank, a chlorination reflux tank, a catalyst tank, a circulating condenser, a condenser, and a chlorine distribution platform. The circulating condenser is located on one side of the chlorination reactor. The feed end of the circulating condenser is connected to the bottom of the chlorination reactor via a pipeline, and the discharge end of the circulating condenser is connected to the top of the chlorination reactor. The output ends of the toluene tank and the catalyst tank are connected to the feed end at the bottom of the chlorination reactor via pipelines. The exhaust end at the top of the chlorination reactor is connected to the condenser via a pipeline. The output end of the condenser is connected to the feed end of the chlorination reflux tank. The chlorination reflux tank is connected to the feed end at the bottom of the chlorination reactor via a pipeline. The inlet end of the chlorine distribution platform is connected to a chlorine pipeline, and the output end of the chlorine distribution platform is connected to the inlet end at the bottom of the chlorination reactor via a pipeline.

[0016] Preferably, the system further includes a deacidification tower, a chlorination tank, a tail gas condenser, a deacidification reflux tank, a deacidification preheater, and a deacidification condenser. The discharge end of the chlorination reactor is connected to the chlorination tank via a pipeline. The tail gas condenser is located at the exhaust end of the chlorination tank, and its exhaust end is connected to the hydrochloric acid recovery tower via a pipeline. The output end of the chlorination tank is connected to the feed end of the deacidification preheater. The discharge end of the deacidification preheater is connected to the feed end of the deacidification reactor. The exhaust end of the upper part of the deacidification reactor is connected to the deacidification condenser via a pipeline. The exhaust end of the deacidification condenser is connected to the hydrochloric acid recovery tower via a pipeline. The liquid discharge end of the deacidification condenser is connected to the deacidification reflux tank via a pipeline. The liquid discharge end of the deacidification reflux tank is connected to the upper reflux end of the deacidification reactor via a pipeline. The exhaust end of the deacidification reflux tank is connected to the hydrochloric acid recovery tower via a pipeline. The deacidification tower is located at the upper part of the deacidification reactor and is connected to the deacidification reactor.

[0017] A chlorination deacidification method for producing chlorotoluene includes the following steps:

[0018] S1 uses a pump to deliver toluene from the toluene tank and catalyst from the catalyst tank into the chlorination reactor;

[0019] S2 slowly open the inlet valve of the forced circulation pump in the chlorination reactor to fill the pump housing with toluene, start the pump, and ensure that the toluene and catalyst in the chlorination reactor are fully mixed;

[0020] S3 begins to introduce chlorine gas into the chlorination reactor; during the initial stage of the chlorination reaction, closely monitor the reaction temperature in the chlorination reactor. When the temperature rises, open the temperature regulating valves on the circulating water pipe of the circulating condenser and the chilled water pipe of the chlorination reactor jacket to allow the temperature to rise steadily. Control and regulate the chlorine gas flow rate, the circulating water flow rate of the circulating condenser, and the chilled water flow rate of the chlorination reactor jacket to control the reaction temperature of the chlorination reactor to ≤48℃; the hydrogen chloride tail gas generated during the chlorination reaction is condensed through the primary condenser and the secondary condenser. The hydrogen chloride gas is sent to the hydrochloric acid recovery tower for treatment, and the condensate is sent to the chlorination reflux tank and then returned to the chlorination reactor;

[0021] S4 Open the discharge valve of the chlorination tank, start the deacidification feed pump, and send the chlorinated liquid after the reaction in the chlorination reactor to the deacidification preheater for preheating. Open the steam pipeline regulating valve of the preheater to control the outlet temperature of the preheater to reach 110℃. When there is liquid in the deacidification reactor, open the steam regulating valve of the deacidification reactor to keep the reactor temperature at 110℃. The gas phase at the top of the deacidification tower is condensed by the deacidification condenser, and the condensate is sent to the deacidification reflux tank. The hydrogen chloride gas is sent to the hydrochloric acid recovery tower for treatment. When the liquid level in the deacidification reflux tank reaches 50%, start the deacidification reflux pump, open the reflux regulating valve to reflux, and keep the liquid level in the deacidification reflux tank stable. Open the discharge valve of the deacidification reactor to discharge the material to the de-heavy removal tower.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The design of the aeration pipes, air inlet shaft, and adjusting shaft allows the rotation of the adjusting shaft to drive multiple aeration pipes to rotate synchronously around it. This enables the aeration pipes to continuously rotate while aerating below the surface of the recovered liquid, resulting in a more uniform distribution of gas entering the recovered liquid and more thorough contact with it. This improves the recovery efficiency of hydrochloric acid from the gas. Simultaneously, the rotation of the aeration pipes disperses rising bubbles, further increasing the contact probability between the gas and the recovered liquid and enhancing recovery efficiency. The rotatable air inlet shaft allows the aeration pipes to rotate on their own axis while rotating around the adjusting shaft, further increasing the contact probability between the gas exiting the aeration pipes and the recovered liquid, thus improving hydrochloric acid recovery efficiency. Furthermore, the wider rotation range of the aeration pipes further increases the probability of dispersing rising bubbles, improving hydrochloric acid recovery efficiency, reducing hydrogen chloride emissions, and ensuring that exhaust gas meets emission standards, thereby reducing air pollution. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the process flow of the present invention.

[0026] Figure 2 This is a three-dimensional structural diagram of the hydrochloric acid recovery tower of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the hydrochloric acid recovery tower of the present invention.

[0028] Figure 4 This is a three-dimensional structural diagram of the baffle plate, spray pipe, and aeration pipe of the present invention.

[0029] Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B.

[0030] Figure 6 This is a schematic cross-sectional view of the aeration pipe, air inlet shaft, and fixing rod of the present invention.

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the baffle plate and the partition plate after separation according to the present invention.

[0032] Figure 8 This is a schematic cross-sectional view of the sealing plate structure of the present invention.

[0033] Figure 9 This is a schematic diagram of the three-dimensional connection structure of the adjusting ring plate and the adjusting gear of the present invention.

[0034] Figure 10 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0035] In the diagram: 1. Chlorination reactor; 11. Condenser; 12. Chlorination reflux tank; 13. Circulating condenser; 14. Toluene tank; 15. Catalyst tank; 2. Chlorine distribution platform; 3. Chlorination liquid tank; 4. Deacidification preheater; 5. Deacidification reactor; 6. Hydrochloric acid recovery tower; 61. Exhaust pipe; 62. Regulating tank; 621. Third shaft; 6211. Fourth bevel gear; 622. Drive shaft; 6221. Fifth bevel gear; 6222. Reciprocating thread; 623. Drive plate; 6231. Drive rack; 6232. Drive pipe; 624. Regulating gear; 6241. First bevel gear; 6242. First shaft; 625. Transmission gear; 6251. Third bevel gear; 6252. Second shaft; 63. Inlet pipe; 64. Spray pipe; 641. Spray main pipe; 65. Adsorbent cotton layer; 651. Baffle plate; 652. 653. Baffle plate; 654. Baffle column; 655. Sealing plate; 6541. First plate; 6542. Limiting groove; 6543. Second plate; 6544. Return spring; 655. Squeezing plate; 656. Adjusting ring plate; 657. Adjusting rack; 66. Circulating pump; 661. Inlet pipe; 662. Outlet pipe; 663. Outlet pipe; 67. Adjusting shaft; 671. Connecting shaft; 672. Guide hole; 673. 674. Guide ring groove; 68. Sixth bevel gear; 69. Drive motor; 601. Base; 612. First helical gear; 62. Second helical gear; 63. Aeration pipe; 64. Inlet shaft; 65. Fixing rod; 66. Connecting groove; 674. Sleeve; 68. Connecting ring groove; 695. Inlet groove; 696. Connecting hole; 7. Deacidification condenser; 8. Deacidification reflux tank; 9. Tail gas condenser. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Reference Figure 1-4A chlorination and deacidification system for producing chlorotoluene includes a chlorination reactor 1, a deacidification reactor 5, and a hydrochloric acid recovery tower 6. The discharge end of the chlorination reactor 1 is connected to the feed end of the deacidification reactor 5 via a pipe. The exhaust ends of the chlorination reactor 1 and the deacidification reactor 5 are connected to the inlet end of the hydrochloric acid recovery tower 6 via pipes. The bottom of the hydrochloric acid recovery tower 6 stores the recovered liquid, and the bottom of the hydrochloric acid recovery tower 6 is provided with a rotatable adjusting shaft 67. Multiple fixed rods 693 are fixedly connected to the outside of the adjusting shaft 67. The ends of the fixed rods 693 are all provided with inclined and rotatable air inlet shafts 692. One end of the air inlet shaft 692 is provided with multiple fixedly connected aeration pipes 691. The aeration pipes 691 are provided with multiple evenly distributed air inlet holes. The air inlet end of the hydrochloric acid recovery tower 6 is provided with a connected air inlet pipe 63. The end of the air inlet pipe 63 is connected to the aeration pipe 691. The upper end of the hydrochloric acid recovery tower 6 is provided with an exhaust pipe 61 for gas discharge.

[0039] The design of the aeration pipe 691, air inlet shaft 692, and adjusting shaft 67 allows the rotation of the adjusting shaft 67 to drive multiple aeration pipes 691 to rotate synchronously around the adjusting shaft 67. This enables the aeration pipes 691 to continuously rotate while aerating below the surface of the recovered liquid. The rotation of the aeration pipes 691 ensures a more uniform distribution of gas entering the recovered liquid, allowing for more thorough contact with the recovered liquid and improving the recovery efficiency of hydrochloric acid from the gas. Simultaneously, the rotation of the aeration pipes 691 also helps to aerate the rising air bubbles. The aeration pipe 691 is further agitated to increase the contact probability between the gas and the recovered liquid, thereby improving the recovery efficiency. The rotatable air intake shaft 692 allows the aeration pipe 691 to rotate around the air intake shaft 692 while rotating around the adjustment shaft 67. This further increases the contact probability between the gas coming out of the aeration pipe 691 and the recovered liquid, improving the recovery efficiency of hydrochloric acid. Moreover, the wider rotation range of the aeration pipe 691 further increases the probability of agitating the rising bubbles, thus improving the hydrochloric acid recovery efficiency.

[0040] Reference Figure 3-4 The hydrochloric acid recovery tower 6 has a fixedly connected base 681 at its bottom. The adjusting shaft 67 is rotatably mounted on the base 681. The base 681 has a first helical gear 682 in an annular shape. The other end of the air intake shaft 692 has a second helical gear 69 that meshes with the first helical gear 682. The second helical gear 69 is inclined. The end of the fixing rod 693 has a fixedly connected sleeve 694. The air intake shaft 692 is rotatably connected inside the sleeve 694.

[0041] Reference Figure 5-6The adjusting shaft 67 has an annular guide ring groove 673 inside, and an annular guide frame is rotatably connected to the outside of the adjusting shaft 67. The air inlet pipe 63 is connected to the guide frame. The guide ring groove 673 has a guide hole 672 connected to the guide frame on the outside. The fixed rod 693 has a connecting groove 6931 inside, which is connected to the guide ring groove 673. The inner wall of the sleeve 694 has an annular connecting ring groove 6941. The connecting groove 6931 is connected to the connecting ring groove 6941. The air inlet shaft 692 has an air inlet groove 695 inside, which is connected to the aeration pipe 691. The air inlet groove 695 has a connecting hole 696 on the outside, which is connected to the connecting ring groove 6941.

[0042] Furthermore, the base 681 is provided with a drive slot, and the drive slot is provided with a drive motor 68. The output end of the drive motor 68 is connected to the adjustment shaft 67.

[0043] Reference Figure 2-4 The hydrochloric acid recovery tower 6 is equipped with a circulation pump 66 on one side. The inlet end of the circulation pump 66 is equipped with an inlet pipe 661 that communicates with the bottom of the hydrochloric acid recovery tower 6, and the outlet end of the circulation pump 66 is equipped with an outlet pipe 663. The middle part of the hydrochloric acid recovery tower 6 is equipped with a spray main pipe 641. The end of the spray main pipe 641 is equipped with multiple interconnected spray pipes 64. The outlet pipe 663 is connected to the spray main pipe 641, and a discharge pipe 662 for discharging material is provided on one side of the outlet pipe 663.

[0044] Reference Figure 1 It also includes a toluene tank 14, a catalyst tank 15, a chlorination reflux tank 12, a circulating condenser 13, a condenser 11, and a chlorine distribution platform 2. The circulating condenser 13 is located on one side of the chlorination reactor 1. The feed end of the circulating condenser 13 is connected to the bottom of the chlorination reactor 1 through a pipe, and the discharge end of the circulating condenser 13 is connected to the top of the chlorination reactor 1. The output ends of the toluene tank 14 and the catalyst tank 15 are connected to the feed end at the bottom of the chlorination reactor 1 through a pipe. The exhaust end at the top of the chlorination reactor 1 is connected to the condenser 11 through a pipe. The output end of the condenser 11 is connected to the feed end of the chlorination reflux tank 12. The chlorination reflux tank 12 is connected to the feed end at the bottom of the chlorination reactor 1 through a pipe. The inlet end of the chlorine distribution platform 2 is connected to a chlorine pipeline, and the output end of the chlorine distribution platform 2 is connected to the inlet end at the bottom of the chlorination reactor 1 through a pipe.

[0045] Reference Figure 1It also includes a chlorination tank 3, a tail gas condenser 9, a deacidification reflux tank 8, a deacidification preheater 4, and a deacidification condenser 7. The discharge end of the chlorination reactor 1 is connected to the chlorination tank 3 via a pipeline. The tail gas condenser 9 is located at the exhaust end of the chlorination tank 3, and the exhaust end of the tail gas condenser 9 is connected to the hydrochloric acid recovery tower 6 via a pipeline. The output end of the chlorination tank 3 is connected to the feed end of the deacidification preheater 4, and the discharge end of the deacidification preheater 4 is connected to the feed end of the deacidification reactor 5. The upper exhaust end of the acid reactor 5 is connected to the deacidification condenser 7 via a pipe. The exhaust end of the deacidification condenser 7 is connected to the hydrochloric acid recovery tower 6 via a pipe. The liquid discharge end of the deacidification condenser 7 is connected to the deacidification reflux tank 8 via a pipe. The liquid discharge end of the deacidification reflux tank 8 is connected to the upper reflux end of the deacidification reactor 5 via a pipe. The exhaust end of the deacidification reflux tank 8 is connected to the hydrochloric acid recovery tower 6 via a pipe. The deacidification tower is located at the upper end of the deacidification reactor 5 and is connected to the deacidification reactor 5.

[0046] Example 2

[0047] Reference Figure 4 and Figure 7 The difference between this embodiment and Embodiment 1 is that...

[0048] The hydrochloric acid recovery tower 6 is equipped with a baffle plate 651 for gas-liquid separation. A baffle column 653 is provided in the middle of the baffle plate 651. Multiple evenly distributed partition plates 652 are provided on the outer side of the baffle column 653. Each partition plate 652 is provided with a fixedly connected adsorbent cotton layer 65. Between adjacent partition plates 652, there is a pressing plate 655 that can move back and forth and squeeze the adsorbent cotton layer 65. A fixedly connected and retractable sealing plate 654 is provided on one side of the bottom of the pressing plate 655 located below the adsorbent cotton layer 65.

[0049] The design of the adsorption cotton layer 65 allows the gas to pass through it before emission, effectively adsorbing moisture and reducing liquid loss while increasing hydrochloric acid recovery. The rotatable extrusion plate 655 allows for timely separation of the adsorbed liquid within the cotton layer 65, ensuring its consistent adsorption capacity and efficient separation of liquid from the gas. This achieves compression of the cotton layer 65 without affecting the original exhaust flow rate. Furthermore, when moving to the other side, the retractable sealing plate 654 allows the extrusion plate 655 to continue compressing the other cotton layer 65.

[0050] Reference Figure 2 and Figure 9The inner wall of the hydrochloric acid recovery tower 6 is provided with an annular regulating groove. The regulating ring plate 656 is slidably connected in the regulating groove. The outer side of the tower body is provided with a fixedly connected regulating box 62. The inner wall of the regulating box 62 is provided with a regulating groove that communicates with the regulating groove. The outer side of the regulating ring plate 656 is provided with a fixedly connected regulating rack 657. The regulating groove is provided with a rotatable regulating gear 624 that meshes with the regulating rack 657.

[0051] Reference Figure 8 The sealing plate 654 includes a first plate 6541 and a second plate 6543. The first plate 6541 has a limiting groove 6542 on one side. The second plate 6543 is slidably connected in the limiting groove 6542. The limiting groove 6542 is provided with a reset spring 6544 for driving the second plate 6543 to automatically return to its initial position.

[0052] The design of the first plate 6541, the second plate 6543, and the return spring 6544 enables the sealing plate 654 to retract and automatically return to its initial position without external force.

[0053] Other undescribed structures are described in Example 1.

[0054] Example 3

[0055] The difference between this embodiment and Embodiment 2 is that,

[0056] Reference Figure 2-3 and Figure 10 The adjusting box 62 contains a rotatable drive shaft 622, on which a reciprocating thread 6222 is provided. A drive tube 6232 connected to the reciprocating thread 6222 is located on the outer side of the drive shaft 622. A drive plate 623 is fixedly connected to the outer side of the drive tube 6232. A drive rack 6231 is provided on the drive plate 623. The adjusting box 62 contains a rotatably connected transmission shaft, on which a transmission gear 625 is fixedly connected and meshes with the drive rack 6231. A support plate is fixedly connected to the adjusting box 62. The adjusting gear 62... 4. A first shaft 6242 is fixedly connected in the middle. The first shaft 6242 is rotatably connected to the support plate. A first bevel gear 6241 is fixedly connected on the first shaft 6242. A second bevel gear is fixedly connected on the transmission shaft. A second shaft 6252 is provided inside the adjustment box 62. A third bevel gear 6251 is fixedly connected at both ends of the second shaft 6252. The third bevel gear 6251 meshes with the corresponding first bevel gear 6241 and the second bevel gear respectively. A positioning ring is fixedly connected on the support plate. The second shaft 6252 is rotatably connected to the positioning ring.

[0057] Furthermore, a third shaft 621 is rotatably connected to the side wall of the hydrochloric acid recovery tower 6. A fourth bevel gear 6211 is fixedly connected to both ends of the third shaft 621. A fifth bevel gear 6221 meshes with the corresponding fourth bevel gear 6211 on the drive shaft 622. A connecting shaft 671 is fixedly connected to the upper end of the adjusting shaft 67. The upper end of the connecting shaft 671 is rotatably connected to the baffle plate. A sixth bevel gear 674 is fixedly connected to the connecting shaft 671 and meshes with the corresponding fourth bevel gear 6211.

[0058] By utilizing the rotation of the adjusting shaft 67, through the transmission of the connecting shaft 671 and the meshing transmission of the bevel gears, the third shaft 621 can be driven to rotate synchronously and continuously with the adjusting shaft 67. The rotation of the third shaft 621 can drive the drive shaft 622 to rotate continuously through the transmission of the fourth bevel gear 6211 and the fifth bevel gear 6221. The continuous rotation of the drive shaft 622, through the characteristics of the reciprocating thread 6222, drives the drive plate 623 to move up and down periodically. By the meshing of the adjusting rack 657 and the transmission gear 625, the drive plate 623 can drive the transmission gear 625 to rotate periodically in both directions. With the meshing transmission of the first bevel gear 6241, the second bevel gear, the second shaft 6252, and the third bevel gear 6251, the adjusting gear 624 can rotate periodically in both directions. This design enables the rotation of the adjusting shaft 67 to achieve the periodic rotation of the adjusting gear 624 through the meshing transmission of gears and racks. The squeezing plate 655 can automatically squeeze the absorbent cotton layer 65 back and forth.

[0059] Other undescribed structures are described in Example 1.

[0060] Example 4

[0061] Reference Figure 1-10 A chlorination deacidification method for producing chlorotoluene includes the following steps:

[0062] S1 uses a pump to deliver toluene from toluene tank 14 and catalyst from catalyst tank 15 into the chlorination reactor;

[0063] S2 slowly opens the inlet valve of the forced circulation pump in the chlorination reactor to fill the pump housing with toluene, and starts the pump to ensure that the toluene and catalyst in the tower are fully mixed.

[0064] S3 opens the valve on the chlorine distribution platform 2 to the chlorination reactor, and simultaneously opens the valves before and after the chlorine regulating valve of the chlorination reactor. The chlorine regulating valve is opened to 20%. The valves before and after the chlorine flow meter are opened. Finally, the manual valve connected to the chlorination reactor is opened to start introducing chlorine into the tower. In the early stage of the chlorination reaction, the reaction temperature of the chlorination reactor 1 is closely observed. When the temperature rises, the temperature regulating valves on the circulating water pipeline of the circulating condenser 13 and the chilled water pipeline of the chlorination reactor jacket are opened appropriately to make the temperature rise steadily. The chlorine flow rate, the circulating water flow rate of the circulating condenser 13 and the chilled water flow rate of the chlorination reactor jacket are controlled and adjusted through the DCS system to control the reaction temperature of the chlorination reactor to ≤48℃. The hydrogen chloride tail gas generated in the chlorination reaction process is condensed by the first-stage condenser 11 and the second-stage condenser 11. The hydrogen chloride gas is sent to the hydrochloric acid recovery tower 6 for treatment. The condensate is sent to the chlorination reflux tank 12 and then refluxed back into the chlorination reactor.

[0065] S4 opens the discharge valve of chlorination tank 3, starts the deacidification feed pump, and sends the chlorinated liquid after the reaction in the chlorination reactor to the deacidification preheater 4 for preheating. Opens the steam pipeline regulating valve of the preheater to control the outlet temperature of the preheater to reach 110℃. When there is liquid in the deacidification reactor 5, opens the steam regulating valve of the deacidification reactor 5. The opening of the steam regulating valve and the temperature of the material in the reactor are interlocked to keep the reactor temperature at 110℃. The gas phase at the top of the deacidification tower is condensed by the deacidification condenser 7. The condensate is sent to the deacidification reflux tank 8, and the hydrogen chloride gas is sent to the hydrochloric acid recovery tower 6 for treatment. When the liquid level in the deacidification reflux tank 8 reaches 50%, starts the deacidification reflux pump, opens the reflux regulating valve to make the tower fully refluxed, and keeps the liquid level in the tank stable. Open the discharge valve of the deacidification vessel to discharge the material into the de-heavyness removal tower, and implement interlocking by controlling the opening of the regulating valve and the set flow rate; gradually increase the feed rate of the deacidification tower, and control the feed flow rate to be equal to the sum of the top output flow rate and the bottom output flow rate; at the same time, ensure that the liquid level in the bottom of the tower is controlled within the specified range to avoid the bottom of the tower being evacuated and acidic gas being drawn into the de-heavyness removal tower;

[0066] The gas entering the hydrochloric acid recovery tower 6 through S5 enters the guide frame through the air inlet pipe 63, then enters the guide ring groove 673 inside the regulating shaft 67 through the guide frame, then enters the connecting groove 6931 inside the fixed rod 693, then enters the connecting ring groove 6941 inside the sleeve 694, then enters the air inlet groove 695 through the connecting hole 696, and finally enters the aeration pipe 691 through the air inlet groove 695, so that the gas can be sprayed out from the aeration hole on the aeration pipe 691 and enter the recovery liquid to contact and absorb the recovery liquid;

[0067] S6 simultaneously starts the drive motor 68, causing the drive motor 68 to drive the adjusting shaft 67 to rotate. The adjusting shaft 67 drives the aeration pipe 691 to rotate around the adjusting shaft 67 via the fixed rod 693, and at the same time drives the second helical gear 69 to move on the first helical gear 682. Due to the rotational connection between the sleeve 694 and the air inlet shaft 692, the second helical gear 69 can rotate, so that the aeration pipe 691 can rotate around the adjusting shaft 67 and also rotate around the air inlet shaft 692. This further increases the contact probability between the gas coming out of the aeration pipe 691 and the recovered liquid, improves the recovery efficiency of hydrochloric acid, and the rotation range of the aeration pipe 691 is wider, which further increases the probability of breaking up rising bubbles, thus improving the hydrochloric acid recovery efficiency.

[0068] S7 starts the circulation pump 66, which draws the recovered liquid from the bottom of the hydrochloric acid recovery tower 6 to the spray pipe 64, and sprays it through the spray pipe 64, so that the spray liquid comes into contact with the rising gas, which further improves the recovery efficiency of hydrochloric acid in the gas.

[0069] As the adjusting shaft 67 rotates, the adjusting gear 624 can rotate periodically in both directions through the transmission of gears, racks and other structures. This design enables the adjusting shaft 67 to rotate periodically in both directions through the meshing transmission of gears and racks, and the squeezing plate 655 can automatically squeeze the absorbent cotton layer 65 back and forth.

[0070] Before reaching the exhaust pipe 61, the airflow carrying liquid particles enters the adsorption zone through the connecting hole 696, and then passes through the adsorption cotton layer 65. The airflow passes through the adsorption cotton layer 65, and the liquid is adsorbed and separated by the adsorption cotton layer 65. The separated gas is finally discharged through the exhaust pipe 61. After the adsorption cotton layer 65 has adsorbed for a certain period of time, the adjusting gear 624 rotates in the forward direction. Through meshing transmission, it drives the adjusting ring plate 656 to rotate, thereby driving multiple extrusion plates 655 to move towards the adsorption cotton layer 65 after absorbing the liquid and to extrude and separate the adsorbed liquid in time, which flows back into the tower body. At the same time as the extrusion is rotated, the sealing plate 654 moves synchronously with the extrusion plate 655. Therefore, the adsorption cotton layer 65 on the other side of the extrusion plate 655 automatically opens, allowing the airflow to automatically pass through another adsorption cotton layer 65. The other adsorption cotton layer 65 adsorbs the liquid in the airflow, while the extruded adsorption cotton layer 65 temporarily loses its adsorption capacity. At the same time, the sealing plate 654 can seal the connecting hole 696 at this point to prevent the airflow from entering.

[0071] After the other absorbent cotton layer 65 has absorbed moisture for a certain period of time, the adjusting gear 624 rotates in the opposite direction under the transmission of the adjusting shaft 67, driving the adjusting ring plate 656 to rotate in the opposite direction, causing the squeezing plate 655 to rotate in the opposite direction. Since the sealing plate 654 is composed of the first plate 6541 and the second plate 6543, under the action of external force, the second plate 6543 is squeezed into the limiting groove 6542 of the first plate 6541, realizing the contraction of the sealing plate 654. During the contraction of the sealing plate 654, the squeezing plate 655 fully squeezes the absorbent cotton layer 65 at this point, so that the moisture absorbed by the absorbent cotton layer 65 can be squeezed and separated in time. Moreover, the mesh at this point is automatically sealed by the sealing plate 654, preventing airflow from entering. Airflow automatically passes through the other absorbent cotton layer 65; thus realizing the intermittent squeezing and intermittent use of the two absorbent cotton layers 65.

[0072] S9 exhausts the gas after adsorbing the cotton layer 65 through the exhaust pipe 61. After the recovered liquid has been used for a certain period of time, the outlet pipe 663 can be closed and the valve of the discharge pipe 662 can be opened through the valve to allow the material to be discharged through the discharge pipe 662.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not 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 invention.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A chlorination deacidification system for producing chlorotoluene, characterized in that: The system includes a chlorination reactor (1), a deacidification reactor (5), and a hydrochloric acid recovery tower (6). The discharge end of the chlorination reactor (1) is connected to the feed end of the deacidification reactor (5) through a pipeline. The exhaust ends of the chlorination reactor (1) and the deacidification reactor (5) are connected to the inlet end of the hydrochloric acid recovery tower (6) through pipelines. The bottom of the hydrochloric acid recovery tower (6) stores the recovered liquid, and the bottom of the hydrochloric acid recovery tower (6) is provided with a rotatable adjusting shaft (67). Multiple fixed rods (693) are fixedly connected to the outside of the adjusting shaft (67). Each of the fixed rods (693) is provided with an inclined and rotatable air intake shaft (692) at one end. Each end of the air intake shaft (692) is provided with a plurality of fixedly connected aeration pipes (691). Each aeration pipe (691) is provided with a plurality of evenly distributed air inlets. The air intake end of the hydrochloric acid recovery tower (6) is provided with a connected air intake pipe (63). The end of the air intake pipe (63) is connected to the aeration pipe (691). The upper end of the hydrochloric acid recovery tower (6) is provided with an exhaust pipe (61) for gas discharge. The hydrochloric acid recovery tower (6) is equipped with a baffle plate (651) for gas-liquid separation. A baffle column (653) is provided in the middle of the baffle plate (651). A plurality of evenly distributed partition plates (652) are provided on the outside of the baffle column (653). An adsorbent cotton layer (65) is fixedly connected on each partition plate (652). An extrusion plate (655) that can move back and forth and squeeze the adsorbent cotton layer (65) is provided between adjacent partition plates (652). A fixedly connected and retractable sealing plate (654) is provided on one side of the bottom of the extrusion plate (655) below the adsorbent cotton layer (65). The hydrochloric acid recovery tower (6) has an annular regulating groove on its inner wall. The regulating ring plate (656) is slidably connected in the regulating ring groove. The tower body has a fixedly connected regulating box (62) on its outer side. The regulating box (62) has an regulating groove on its inner wall that communicates with the regulating ring groove. The regulating ring plate (656) has a fixedly connected regulating rack (657) on its outer side. The regulating groove has a rotatable regulating gear (624) that meshes with the regulating rack (657).

2. The chlorination deacidification system for producing chlorotoluene according to claim 1, characterized in that: The hydrochloric acid recovery tower (6) is provided with a fixed base (681) at the bottom. The adjusting shaft (67) is rotatably mounted on the base (681). The base (681) is provided with a first helical gear (682) in the shape of a ring. The other end of the air intake shaft (692) is provided with a second helical gear (69) that meshes with the first helical gear (682). The second helical gear (69) is inclined. The end of the fixed rod (693) is provided with a fixed sleeve (694). The air intake shaft (692) is rotatably connected inside the sleeve (694).

3. A chlorination deacidification system for producing chlorinated toluene according to claim 2, characterized in that: The adjusting shaft (67) is provided with an annular guide ring groove (673) inside, and an annular guide frame is provided on the outside of the adjusting shaft (67). The air inlet pipe (63) is connected to the guide frame. The guide ring groove (673) is provided with a guide hole (672) connected to the guide frame on the outside. The fixed rod (693) is provided with a connecting groove (6931) connected to the guide ring groove (673) inside. The sleeve (694) is provided with an annular connecting ring groove (6941) on the inner side wall. The connecting groove (6931) is connected to the connecting ring groove (6941). The air inlet shaft (692) is provided with an air inlet groove (695). The air inlet groove (695) is connected to the aeration pipe (691). The air inlet groove (695) is provided with a connecting hole (696) connected to the connecting ring groove (6941) on the outside.

4. A chlorination deacidification system for producing chlorotoluene according to claim 2, characterized in that: The base (681) is provided with a drive slot, and the drive slot is provided with a drive motor (68). The output end of the drive motor (68) is connected to the adjustment shaft (67).

5. A chlorination deacidification system for producing chlorotoluene according to claim 1, characterized in that: It also includes a toluene tank (14), a catalyst tank (15), a chlorination reflux tank (12), a circulating condenser (13), a condenser (11), and a chlorine distribution platform (2); the circulating condenser (13) is located on one side of the chlorination reactor (1), the feed end of the circulating condenser (13) is connected to the bottom of the chlorination reactor (1) through a pipe, and the discharge end of the circulating condenser (13) is connected to the upper end of the chlorination reactor (1), the output ends of the toluene tank (14) and the catalyst tank (15) are connected to the bottom feed end of the chlorination reactor (1) through a pipe, the exhaust end of the upper end of the chlorination reactor (1) is connected to the condenser (11) through a pipe, the output end of the condenser (11) is connected to the feed end of the chlorination reflux tank (12), the chlorination reflux tank (12) is connected to the bottom feed end of the chlorination reactor (1) through a pipe, the inlet end of the chlorine distribution platform (2) is connected to the chlorine pipeline, and the output end of the chlorine distribution platform (2) is connected to the bottom inlet end of the chlorination reactor (1) through a pipe.

6. A chlorination deacidification system for producing chlorotoluene according to claim 1, characterized in that: It also includes a deacidification tower, a chlorination tank (3), a tail gas condenser (9), a deacidification reflux tank (8), a deacidification preheater (4), and a deacidification condenser (7). The discharge end of the chlorination vessel (1) is connected to the chlorination tank (3) through a pipeline. The tail gas condenser (9) is located at the exhaust end of the chlorination tank (3), and the exhaust end of the tail gas condenser (9) is connected to the hydrochloric acid recovery tower (6) through a pipeline. The output end of the chlorination tank (3) is connected to the feed end of the deacidification preheater (4), and the discharge end of the deacidification preheater (4) is connected to the feed end of the deacidification vessel (5). The upper exhaust end of the deacidification kettle (5) is connected to the deacidification condenser (7) through a pipe. The exhaust end of the deacidification condenser (7) is connected to the hydrochloric acid recovery tower (6) through a pipe. The liquid discharge end of the deacidification condenser (7) is connected to the deacidification reflux tank (8) through a pipe. The liquid discharge end of the deacidification reflux tank (8) is connected to the upper reflux end of the deacidification kettle (5) through a pipe. The exhaust end of the deacidification reflux tank (8) is connected to the hydrochloric acid recovery tower (6) through a pipe. The deacidification tower is located at the upper end of the deacidification kettle (5) and is connected to the deacidification kettle (5).

7. A chlorination deacidification method for producing chlorotoluene, comprising a chlorination deacidification system for producing chlorotoluene as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. The toluene in the toluene tank (14) and the catalyst in the catalyst tank (15) are fed into the chlorination reactor (1) by means of a pump. S2. Slowly open the inlet valve of the forced circulation pump of the chlorination vessel (1) to fill the pump housing with toluene, start the pump, and make the toluene and catalyst in the chlorination vessel (1) fully mixed; S3. Start introducing chlorine gas into the chlorination reactor (1); In the early stage of the chlorination reaction, closely observe the reaction temperature of the chlorination reactor (1), open the temperature regulating valves on the circulating water pipe of the circulating condenser (13) and the chilled water pipe of the chlorination reactor jacket to make the temperature rise steadily, control the flow rate of chlorine gas, the flow rate of circulating water in the circulating condenser (13) and the flow rate of chilled water in the chlorination reactor jacket, and control the reaction temperature of the chlorination reactor (1) to ≤48℃; The hydrogen chloride tail gas generated in the chlorination reaction process is condensed by the condenser (11), and the hydrogen chloride gas is sent to the hydrochloric acid recovery tower (6) for treatment, and the condensate is sent to the chlorination reflux tank (12) and then refluxed back into the chlorination reactor; S4. Open the discharge valve of the chlorination tank (3), start the deacidification feed pump, and send the chlorinated liquid after the reaction in the chlorination kettle (1) to the deacidification preheater (4) for preheating. Open the steam pipeline regulating valve of the preheater and control the outlet temperature of the preheater to reach 110℃. When there is liquid in the deacidification kettle (5), open the steam regulating valve of the deacidification kettle (5) to keep the kettle temperature at 110℃. The gas phase at the top of the deacidification tower is condensed by the deacidification condenser (7), and the condensate is sent to the deacidification reflux tank (8). The hydrogen chloride gas is sent to the hydrochloric acid recovery tower (6) for treatment. When the liquid level in the deacidification reflux tank (8) reaches 50%, start the deacidification reflux pump, open the reflux regulating valve for reflux, and keep the liquid level in the deacidification reflux tank (8) stable. Open the discharge valve of the deacidification kettle to discharge the material to the de-weighting tower.

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