Energy-saving synthesis method and device of 2-chloronicotinic acid

Abstract

The invention relates to the technical field of chemistry, in particular to an energy-saving synthesis method and device of 2-chloronicotinic acid, and the energy-saving synthesis device of 2-chloronicotinic acid comprises a reaction kettle; the device further comprises a preparation assembly. The preparation assembly comprises a kettle cover, a first lifting mechanism, a partition plate, a gear motor, a left lifting pipe, a right lifting pipe, a second lifting mechanism, a left aeration pipe mechanism, a right aeration pipe mechanism, a bent butt joint pipe, an air pump, a connecting pipe, a butt joint and a tail gas pipe. During use, chlorine is firstly introduced into the reaction liquid on the left side of the partition plate to react with the reaction liquid, and the future and reacted chlorine is driven by the air pump, sequentially passes through the bent butt joint pipe and the right lifting pipe, and is finally introduced into the reaction liquid on the right side of the partition plate from the right aeration pipe mechanism to react with the reaction liquid; chlorine provided by the chlorine gas source reacts with the reaction liquid as much as possible, so that the utilization rate of the chlorine can be improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and particularly to an energy-saving synthesis method and device for 2-chloronicotinic acid. Background Art

[0002] 2-chloronicotinic acid, also known as 2-chloro-3-pyridinecarboxylic acid, is an important component or synthetic intermediate of certain highly effective and low-toxic pesticides, such as insecticides, herbicides, etc.; it can also be an important intermediate in the synthesis process of some drug molecules and participate in the preparation process of various drugs.

[0003] In the prior art for preparing 2-chloronicotinic acid, the method of nicotinic acid chlorination is adopted. Nicotinic acid and a catalyst are dissolved in a solvent to form a reaction solution, which is added to a reaction kettle. Then, a chlorine gas source is connected to a porous distributor at the bottom of the reaction kettle, and chlorine gas is introduced into the reaction solution to obtain 2-chloronicotinic acid. The unreacted chlorine gas is absorbed and treated by a tail gas treatment absorption tower.

[0004] However, by the above method, the chlorine gas that has not had time to react with the reaction solution directly escapes from the reaction solution and is absorbed and treated by the subsequent absorption tower, resulting in low utilization rate of chlorine gas and high cost of chlorine gas. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy-saving synthesis method and device for 2-chloronicotinic acid, which can improve the utilization rate of chlorine gas and reduce costs.

[0006] To achieve the above purpose, in the first aspect, the present invention provides an energy-saving synthesis device for 2-chloronicotinic acid, including a reaction kettle;

[0007] It further includes a preparation component;

[0008] The preparation component includes a kettle cover, a first lifting mechanism, a partition board, a reduction motor, a left lifting pipe, a right lifting pipe, a second lifting mechanism, a left air injection pipe mechanism, a right air injection pipe mechanism, a bent docking pipe, an air pump, a connecting pipe, a docking head, and a tail gas pipe;

[0009] The kettle cover is located at the top of the reaction kettle, and the kettle cover has two storage grooves; the first lifting mechanism is fixedly arranged on the reaction kettle for driving the kettle cover to lift; the partition plate is rotatably arranged at the bottom of the kettle cover; the reduction motor is fixedly arranged on the top of the kettle cover, and the output end of the reduction motor is fixedly connected with the partition plate; the left lifting pipe is slidably arranged on the kettle cover and passes through the kettle cover; the right lifting pipe is slidably arranged on the kettle cover and passes through the kettle cover; the second lifting mechanism is fixedly arranged on the kettle cover for driving the left lifting pipe and the right lifting pipe to lift; the left air supply pipe mechanism is communicated and arranged at the bottom of the left lifting pipe; the right air supply pipe mechanism is communicated and arranged at the bottom of the right lifting pipe; the bent docking pipe is communicated and arranged at the top of the right lifting pipe; the air pump is fixedly arranged on the top of the kettle cover; the connecting pipe is communicated with the air pump, fixedly connected with the kettle cover and passes through the kettle cover; the docking head is communicated and arranged on the air pump; the tail gas pipe is fixedly arranged on the kettle cover and passes through the kettle cover.

[0010] Wherein, the preparation assembly further includes a first annular gasket and a second annular gasket;

[0011] The first annular gasket is fixedly arranged at the bottom of the kettle cover; the second annular gasket is fixedly arranged inside the docking head.

[0012] Wherein, the first lifting mechanism includes two first mounting blocks, two first hydraulic cylinders and two ear plates;

[0013] The two first mounting blocks are respectively fixedly arranged on the side of the reaction kettle; the two first hydraulic cylinders are respectively fixedly arranged on the two first mounting blocks; the two ear plates are respectively fixedly connected with the kettle cover, respectively fixedly connected with the output ends of the two first hydraulic cylinders and are respectively located on the side of the kettle cover.

[0014] Wherein, the partition plate includes a mounting shaft and a plate body;

[0015] The mounting shaft is rotatably connected with the kettle cover, fixedly connected with the output end of the reduction motor and passes through the kettle cover; the plate body is fixedly arranged on the mounting shaft.

[0016] Wherein, the second lifting mechanism includes a second mounting block, a second hydraulic cylinder and a connecting frame;

[0017] The second mounting block is fixedly arranged on the side of the kettle cover; the second hydraulic cylinder is fixedly arranged on the second mounting block; the connecting frame is fixedly connected with the output end of the second hydraulic cylinder and is respectively fixedly connected with the left lifting pipe and the right lifting pipe and is located on the top of the second hydraulic cylinder.

[0018] Among them, the second lifting mechanism further includes a reinforcing frame;

[0019] The reinforcing frame is fixedly connected to the connecting frame and fixedly connected to the bent docking pipe, and is located on one side of the connecting frame.

[0020] Among them, the left aeration pipe mechanism includes a left main pipe and a plurality of left perforated branch pipes;

[0021] The left main pipe is communicatively arranged at the bottom of the left lifting pipe; a plurality of the left perforated branch pipes are respectively communicatively arranged on the left main pipe.

[0022] Among them, the right aeration pipe mechanism includes a right main pipe and a plurality of right perforated branch pipes;

[0023] The right main pipe is communicatively arranged at the bottom of the right lifting pipe; a plurality of the right perforated branch pipes are respectively communicatively arranged on the right main pipe.

[0024] In a second aspect, the present invention further provides an energy-saving synthesis method of 2-chloronicotinic acid, including:

[0025] Dissolving nicotinic acid and a catalyst in a solvent to form a reaction solution;

[0026] The first lifting mechanism drives the kettle lid to rise, adds the reaction solution into the reaction kettle, and then uses the first lifting mechanism to drive the kettle lid to move down and reset, and the reaction kettle heats the reaction solution to a set temperature and keeps it warm;

[0027] Connect the left lifting pipe to a chlorine gas source, start the air pump, and introduce chlorine gas from the left aeration pipe mechanism into the reaction solution on the left side of the partition to react with the reaction solution. The unreacted chlorine gas, under the action of the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced into the reaction solution on the right side of the partition from the right aeration pipe mechanism to react with the reaction solution;

[0028] After reacting for a predetermined time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time and then turn off the air pump. The second lifting mechanism drives the left lifting pipe and the right lifting pipe to rise, and finally drives the left aeration pipe mechanism and the right aeration pipe mechanism to move up and be respectively received in two receiving grooves. The bent docking pipe is separated from the docking head, and the reduction motor is started to drive the partition to rotate 180 degrees;

[0029] The second lifting mechanism drives the left lifting pipe and the right lifting pipe to descend, and finally drives the left aeration pipe mechanism and the right aeration pipe mechanism to move down and reset, and the bent docking pipe is re-docked and communicated with the docking head;

[0030] Connect the left lifting pipe to the chlorine gas source and start the air pump. Chlorine gas is introduced into the reaction liquid on the left side of the partition from within the left aeration pipe mechanism to react with the reaction liquid. The unreacted chlorine gas, under the action of the air pump, successively passes through the bent connecting pipe and the right lifting pipe, and finally is introduced into the reaction liquid on the right side of the partition from the right aeration pipe mechanism to react with the reaction liquid;

[0031] After the reaction for a predetermined time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time and then turn off the air pump, and discharge the reaction liquid from the reaction kettle to carry out the acidification crystallization process to obtain 2-chloronicotinic acid.

[0032] An energy-saving synthesis method and device for 2-chloronicotinic acid according to the present invention, when in use, the first lifting mechanism drives the kettle cover to rise, adds the reaction liquid into the reaction kettle, and then uses the first lifting mechanism to drive the kettle cover to move down and reset. At this time, the partition plate also inserts into the reaction kettle, dividing the reaction kettle into two sealed spaces on the left and right. At this time, the bent docking pipe is communicated with the docking head. Then the reaction kettle heats the reaction liquid to a set temperature and keeps it warm; the left lifting pipe is communicated with a chlorine gas source, and the air pump is started. Chlorine gas is introduced from the left air injection pipe mechanism into the reaction liquid on the left side of the partition plate to react with the reaction liquid. The chlorine gas that has not had time to react, under the action of the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced from the right air injection pipe mechanism into the reaction liquid on the right side of the partition plate to react with the reaction liquid; after a predetermined reaction time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time, and then turn off the air pump. The second lifting mechanism drives the left lifting pipe and the right lifting pipe to rise, and finally drives the left air injection pipe mechanism and the right air injection pipe mechanism to move up and be respectively received in the two receiving grooves. At this time, the bent docking pipe is separated from the docking head. The reduction motor is started to drive the partition plate to rotate 180 degrees, so that the positions of the reaction liquids on the left and right sides of the partition plate are interchanged. Then the second lifting mechanism drives the left lifting pipe and the right lifting pipe to descend, and finally drives the left air injection pipe mechanism and the right air injection pipe mechanism to move down and reset. At this time, the bent docking pipe is re-docked and communicated with the docking head; the left lifting pipe is communicated with the chlorine gas source again, and the air pump is started. Chlorine gas is introduced from the left air injection pipe mechanism into the reaction liquid on the left side of the partition plate to react with the reaction liquid. The chlorine gas that has not had time to react, under the action of the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced from the right air injection pipe mechanism into the reaction liquid on the right side of the partition plate to react with the reaction liquid; after a predetermined reaction time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time, and then turn off the air pump; by adopting the above method, first introduce chlorine gas into the reaction liquid on the left side of the partition plate to react with the reaction liquid, and the chlorine gas that has not had time to react is driven by the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced from the right air injection pipe mechanism into the reaction liquid on the right side of the partition plate to react with the reaction liquid, so as to improve the utilization rate of chlorine gas and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0034] Figure 1 It is a schematic structural diagram of the first embodiment of the present invention.

[0035] Figure 2 It is a schematic structural diagram of the first embodiment of the present invention from another angle.

[0036] Figure 3 It is a right view of the first embodiment of the present invention.

[0037] Figure 4 It is Figure 3 A cross-sectional view along the A-A direction.

[0038] Figure 5 It is Figure 4 A partial enlarged view of detail A.

[0039] Figure 6 It is a cross-sectional view of the first embodiment of the present invention.

[0040] Figure 7 It is a schematic flow chart of the second embodiment of the present invention.

[0041] 1 - Reactor, 2 - Kettle cover, 3 - First lifting mechanism, 4 - Partition board, 5 - Reduction motor, 6 - Left lifting pipe, 7 - Right lifting pipe, 8 - Second lifting mechanism, 9 - Left aeration pipe mechanism, 10 - Right aeration pipe mechanism, 11 - Bending docking pipe, 12 - Air pump, 13 - Connecting pipe, 14 - Docking head, 15 - Tail gas pipe, 16 - First annular sealing gasket, 17 - Second annular sealing gasket, 21 - Receiving groove, 31 - First mounting block, 32 - First hydraulic cylinder, 33 - Ear plate, 41 - Mounting shaft, 42 - Plate body, 81 - Second mounting block, 82 - Second hydraulic cylinder, 83 - Connecting frame, 84 - Reinforcing frame, 91 - Left main pipe, 92 - Left perforated branch pipe, 101 - Right main pipe, 102 - Right perforated branch pipe. Detailed implementation manner

[0042] The first embodiment of this application is as follows:

[0043] Please refer to Figures 1-6 , wherein, Figure 1 It is a schematic structural diagram of the first embodiment of the present invention. Figure 2 It is a schematic structural diagram of the first embodiment of the present invention from another angle. Figure 3 It is a right view of the first embodiment of the present invention. Figure 4 It is Figure 3 A cross-sectional view along the A-A direction. Figure 5 It is Figure 4 A partial enlarged view of detail A. Figure 6 It is a cross-sectional view of the first embodiment of the present invention.

[0044] The present invention provides an energy-saving synthesis device for 2-chloronicotinic acid, which comprises a reaction kettle 1; and a preparation component is further included; the preparation component includes a kettle cover 2, a first lifting mechanism 3, a partition plate 4, a reduction motor 5, a left lifting pipe 6, a right lifting pipe 7, a second lifting mechanism 8, a left air supply pipe mechanism 9, a right air supply pipe mechanism 10, a bent docking pipe 11, an air pump 12, a connecting pipe 13, a docking head 14 and a tail gas pipe 15; the kettle cover 2 has two receiving grooves 21; the preparation component further includes a first annular sealing gasket 16 and a second annular sealing gasket 17; the first lifting mechanism 3 includes two first mounting blocks 31, two first hydraulic cylinders 32 and two ear plates 33; the partition plate 4 includes a mounting shaft 41 and a plate body 42; the second lifting mechanism 8 includes a second mounting block 81, a second hydraulic cylinder 82 and a connecting frame 83; the second lifting mechanism 8 further includes a reinforcing frame 84; the left air supply pipe mechanism 9 includes a left main pipe 91 and a plurality of left perforated branch pipes 92; the right air supply pipe mechanism 10 includes a right main pipe 101 and a plurality of right perforated branch pipes 102; through the foregoing scheme, the utilization rate of chlorine gas can be improved and the cost can be reduced.

[0045] Further, the preparation component includes a kettle cover 2, a first lifting mechanism 3, a partition plate 4, a reduction motor 5, a left lifting pipe 6, a right lifting pipe 7, a second lifting mechanism 8, a left air supply pipe mechanism 9, a right air supply pipe mechanism 10, a bent docking pipe 11, an air pump 12, a connecting pipe 13, a docking head 14 and a tail gas pipe 15;

[0046] The kettle cover 2 is located at the top of the reaction kettle 1, and the kettle cover 2 has two receiving grooves 21; the first lifting mechanism 3 is fixedly arranged on the reaction kettle 1 and is used for driving the kettle cover 2 to lift; the partition plate 4 is rotatably arranged at the bottom of the kettle cover 2; the reduction motor 5 is fixedly arranged on the top of the kettle cover 2, and the output end of the reduction motor 5 is fixedly connected with the partition plate 4; the left lifting pipe 6 is slidably arranged on the kettle cover 2 and passes through the kettle cover 2; the right lifting pipe 7 is slidably arranged on the kettle cover 2 and passes through the kettle cover 2; the second lifting mechanism 8 is fixedly arranged on the kettle cover 2 and is used for driving the left lifting pipe 6 and the right lifting pipe 7 to lift; the left air supply pipe mechanism 9 is communicated and arranged at the bottom of the left lifting pipe 6; the right air supply pipe mechanism 10 is communicated and arranged at the bottom of the right lifting pipe 7; the bent docking pipe 11 is communicated and arranged at the top of the right lifting pipe 7; the air pump 12 is fixedly arranged on the top of the kettle cover 2; the connecting pipe 13 is communicated with the air pump 12, is fixedly connected with the kettle cover 2 and passes through the kettle cover 2; the docking head 14 is communicated and arranged on the air pump 12; the tail gas pipe 15 is fixedly arranged on the kettle cover 2 and passes through the kettle cover 2.

[0047] In this embodiment, the kettle cover 2 is driven to move up and down by the first lifting mechanism 3; the partition plate 4 divides the reaction kettle 1 into two left and right spaces, and the reduction motor 5 can drive the partition plate 4 to rotate; the left air supply pipe mechanism 9 and the right air supply pipe mechanism 10 have the same structure, and the end of the bent docking pipe 11 can be inserted into the docking head 14 for docking and connection, so as to connect the air pump 12 with the right lifting pipe 7; the tail gas pipe 15 is used to discharge the tail gas into the absorption tower for treatment; the connecting pipe 13 is communicated with the space on the left side of the partition plate 4, and the tail gas pipe 15 is communicated with the space on the right side of the partition plate 4; during use, the first lifting mechanism 3 drives the kettle cover 2 to rise, adds the reaction liquid into the reaction kettle 1, and then uses the first lifting mechanism 3 to drive the kettle cover 2 to move down and reset. At this time, the partition plate 4 also inserts into the reaction kettle 1, dividing the reaction kettle 1 into two left and right closed spaces. At this time, the bent docking pipe 11 and the docking head 14 are connected. Then, the reaction liquid in the reaction kettle 1 is heated to a set temperature and kept warm; the left lifting pipe 6 is connected to the chlorine gas source, and the air pump 12 is started. Chlorine gas is introduced into the reaction liquid on the left side of the partition plate 4 from the left air supply pipe mechanism 9 to react with the reaction liquid. The chlorine gas that has not had time to react, under the action of the air pump 12, passes through the bent docking pipe 11 and the right lifting pipe 7 in sequence, and finally is introduced into the reaction liquid on the right side of the partition plate 4 from the right air supply pipe mechanism 10 to react with the reaction liquid; after the reaction for a predetermined time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time and then turn off the air pump 12. The second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to rise, and finally drives the left air supply pipe mechanism 9 and the right air supply pipe mechanism 10 to move up and be respectively received in the two receiving grooves 21. At this time, the bent docking pipe 11 is separated from the docking head 14. Start the reduction motor 5 to drive the partition plate 4 to rotate 180 degrees, so that the positions of the reaction liquids on the left and right sides of the partition plate 4 are interchanged. Then, the second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to descend, and finally drives the left air supply pipe mechanism 9 and the right air supply pipe mechanism 10 to move down and reset. At this time, the bent docking pipe 11 and the docking head 14 are re-docked and connected; once again, the left lifting pipe 6 is connected to the chlorine gas source, and the air pump 12 is started. Chlorine gas is introduced into the reaction liquid on the left side of the partition plate 4 from the left air supply pipe mechanism 9 to react with the reaction liquid. The chlorine gas that has not had time to react, under the action of the air pump 12, passes through the bent docking pipe 11 and the right lifting pipe 7 in sequence, and finally is introduced into the reaction liquid on the right side of the partition plate 4 from the right air supply pipe mechanism 10 to react with the reaction liquid; after the reaction for a predetermined time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time and then turn off the air pump 12;In the above - mentioned manner, chlorine gas is first introduced into the reaction liquid on the left side of the partition plate 4 to react with the reaction liquid. The unreacted chlorine gas is then driven by the air pump 12 and successively passes through the bent docking pipe 11 and the right lifting pipe 7, and finally enters the reaction liquid on the right side of the partition plate 4 through the right air - diffusing pipe mechanism 10 to react with the reaction liquid. All the chlorine gas provided by the chlorine gas source reacts with the reaction liquid as much as possible, thereby improving the utilization rate of chlorine gas and reducing costs.

[0048] Furthermore, the preparation assembly further includes a first annular gasket 16 and a second annular gasket 17.

[0049] The first annular gasket 16 is fixedly arranged at the bottom of the kettle cover 2; the second annular gasket 17 is fixedly arranged inside the docking head 14.

[0050] In this embodiment, the first annular gasket 16 is used to seal the gap between the kettle cover 2 and the reaction kettle 1. After the end of the bent docking pipe 11 is inserted into the docking head 14, the second annular gasket 17 is pressed, and the second annular gasket 17 seals the gap between the end of the bent docking pipe 11 and the docking head 14.

[0051] Furthermore, the first lifting mechanism 3 includes two first mounting blocks 31, two first hydraulic cylinders 32, and two ear plates 33.

[0052] The two first mounting blocks 31 are respectively fixedly arranged on the side of the reaction kettle 1; the two first hydraulic cylinders 32 are respectively fixedly arranged on the two first mounting blocks 31; the two ear plates 33 are respectively fixedly connected to the kettle cover 2 and are respectively fixedly connected to the output ends of the two first hydraulic cylinders 32, and are respectively located on the side of the kettle cover 2.

[0053] In this embodiment, the first mounting block 31 is used to mount the first hydraulic cylinder 32, and the two first hydraulic cylinders 32 drive the kettle cover 2 to lift through the two ear plates 33.

[0054] Furthermore, the partition plate 4 includes a mounting shaft 41 and a plate body 42.

[0055] The mounting shaft 41 is rotatably connected to the kettle cover 2, fixedly connected to the output end of the reduction motor 5, and passes through the kettle cover 2; the plate body 42 is fixedly arranged on the mounting shaft 41.

[0056] In this embodiment, the mounting shaft 41 is connected to the output end of the reduction motor 5, the plate body 42 is in close contact with the inner wall of the reaction kettle 1, and the reduction motor 5 drives the mounting shaft 41 to rotate, thereby driving the plate body 42 to rotate.

[0057] Further, the second lifting mechanism 8 includes a second mounting block 81, a second hydraulic cylinder 82 and a connecting frame 83;

[0058] The second mounting block 81 is fixedly arranged on the side of the kettle lid 2; the second hydraulic cylinder 82 is fixedly arranged on the second mounting block 81; the connecting frame 83 is fixedly connected to the output end of the second hydraulic cylinder 82, and is respectively fixedly connected to the left lifting pipe 6 and the right lifting pipe 7, and is located on the top of the second hydraulic cylinder 82.

[0059] In this embodiment, the second mounting block 81 is used to mount the second hydraulic cylinder 82, and the second hydraulic cylinder 82 drives the connecting frame 83 to lift, so as to synchronously drive the left lifting pipe 6 and the right lifting pipe 7 to lift.

[0060] Further, the second lifting mechanism 8 further includes a reinforcing frame 84;

[0061] The reinforcing frame 84 is fixedly connected to the connecting frame 83, and is fixedly connected to the bent docking pipe 11, and is located on one side of the connecting frame 83.

[0062] In this embodiment, the reinforcing frame 84 is used to connect the bent docking pipe 11 and the connecting frame 83 together, so that the bent docking pipe 11 can be lifted stably.

[0063] Further, the left air supply pipe mechanism 9 includes a left main pipe 91 and a plurality of left perforated branch pipes 92;

[0064] The left main pipe 91 is communicated and arranged at the bottom of the left lifting pipe 6; a plurality of the left perforated branch pipes 92 are respectively communicated and arranged on the left main pipe 91.

[0065] In this embodiment, a plurality of the left perforated branch pipes 92 are respectively arranged on both sides of the left main pipe 91, chlorine gas enters the left main pipe 91 from the left lifting pipe 6, and then escapes from the air holes of the plurality of left perforated branch pipes 92 and is introduced into the reaction liquid.

[0066] Further, the right air supply pipe mechanism 10 includes a right main pipe 101 and a plurality of right perforated branch pipes 102;

[0067] The right main pipe 101 is communicated and arranged at the bottom of the right lifting pipe 7; a plurality of the right perforated branch pipes 102 are respectively communicated and arranged on the right main pipe 101.

[0068] In this embodiment, a plurality of the right perforated branch pipes 102 are respectively arranged on both sides of the right main pipe 101, chlorine gas enters the right main pipe 101 from the right lifting pipe 7, and then escapes from the air holes of the plurality of right perforated branch pipes 102 and is introduced into the reaction liquid.

[0069] In the energy-saving synthesis device of 2-chloronicotinic acid according to this embodiment, when in use, the first lifting mechanism 3 drives the kettle cover 2 to rise, adds the reaction solution into the reaction kettle 1, and then uses the first lifting mechanism 3 to drive the kettle cover 2 to move down and reset. At this time, the partition plate 4 also inserts into the reaction kettle 1, dividing the reaction kettle 1 into two sealed spaces on the left and right. At this time, the bent docking pipe 11 and the docking head 14 are connected. Then, the reaction kettle 1 heats the reaction solution to a set temperature and keeps it warm; connects the left lifting pipe 6 to the chlorine gas source and starts the air pump 12. Chlorine gas is introduced from the left air supply pipe mechanism 9 into the reaction solution on the left side of the partition plate 4 to react with the reaction solution. The chlorine gas that has not had time to react, under the action of the air pump 12, successively passes through the bent docking pipe 11 and the right lifting pipe 7, and finally is introduced from the right air supply pipe mechanism 10 into the reaction solution on the right side of the partition plate 4 to react with the reaction solution; after a predetermined reaction time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time, and then turn off the air pump 12. The second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to rise, and finally drives the left air supply pipe mechanism 9 and the right air supply pipe mechanism 10 to move up and be respectively received in the two receiving grooves 21. At this time, the bent docking pipe 11 is separated from the docking head 14. Start the reduction motor 5 to drive the partition plate 4 to rotate 180 degrees, so that the positions of the reaction solutions on the left and right sides of the partition plate 4 are interchanged. Then, the second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to descend, and finally drives the left air supply pipe mechanism 9 and the right air supply pipe mechanism 10 to move down and reset. At this time, the bent docking pipe 11 is re-docked and connected to the docking head 14; connect the left lifting pipe 6 to the chlorine gas source again and start the air pump 12. Chlorine gas is introduced from the left air supply pipe mechanism 9 into the reaction solution on the left side of the partition plate 4 to react with the reaction solution. The chlorine gas that has not had time to react, under the action of the air pump 12, successively passes through the bent docking pipe 11 and the right lifting pipe 7, and finally is introduced from the right air supply pipe mechanism 10 into the reaction solution on the right side of the partition plate 4 to react with the reaction solution; after a predetermined reaction time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time, and then turn off the air pump 12; by adopting the above method, first introduce chlorine gas into the reaction solution on the left side of the partition plate 4 to react with the reaction solution. The chlorine gas that has not had time to react is driven by the air pump 12, successively passes through the bent docking pipe 11 and the right lifting pipe 7, and finally is introduced from the right air supply pipe mechanism 10 into the reaction solution on the right side of the partition plate 4 to react with the reaction solution. The chlorine gas provided by the chlorine gas source reacts with the reaction solution as much as possible, thereby improving the utilization rate of chlorine gas, reducing the consumption of chlorine gas, reducing the energy and cost consumed in producing chlorine gas, and achieving energy saving.

[0070] The second embodiment of this application is:

[0071] Based on the first embodiment, please refer to Figure 7 , where Figure 7 is a schematic process diagram of the second embodiment of the present invention.

[0072] An energy-saving synthesis method of 2-chloronicotinic acid provided by the present invention includes:

[0073] S1 Dissolve nicotinic acid and a catalyst in a solvent to form a reaction solution;

[0074] S2 The first lifting mechanism 3 drives the kettle lid 2 to rise, adds the reaction solution into the reaction kettle 1, and then uses the first lifting mechanism 3 to drive the kettle lid 2 to move down and reset. The reaction kettle 1 heats the reaction solution to a set temperature and keeps it warm;

[0075] S3 Connect the left lifting pipe 6 to a chlorine gas source, start the air pump 12, and introduce chlorine gas from the left gas injection pipe mechanism 9 into the reaction solution on the left side of the partition plate 4 to react with the reaction solution. The unreacted chlorine gas, under the action of the air pump 12, sequentially passes through the bent docking pipe 11 and the right lifting pipe 7, and finally is introduced from the right gas injection pipe mechanism 10 into the reaction solution on the right side of the partition plate 4 to react with the reaction solution;

[0076] S4 After reacting for a predetermined time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time and then turn off the air pump 12. The second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to rise, and finally drives the left gas injection pipe mechanism 9 and the right gas injection pipe mechanism 10 to move up and be respectively received in the two receiving grooves 21. The bent docking pipe 11 is separated from the docking head 14, and start the reduction motor 5 to drive the partition plate 4 to rotate 180 degrees;

[0077] S5 The second lifting mechanism 8 drives the left lifting pipe 6 and the right lifting pipe 7 to descend, and finally drives the left gas injection pipe mechanism 9 and the right gas injection pipe mechanism 10 to move down and reset. The bent docking pipe 11 is re-docked and connected to the docking head 14;

[0078] S6 Connect the left lifting pipe 6 to a chlorine gas source, start the air pump 12, and introduce chlorine gas from the left gas injection pipe mechanism 9 into the reaction solution on the left side of the partition plate 4 to react with the reaction solution. The unreacted chlorine gas, under the action of the air pump 12, sequentially passes through the bent docking pipe 11 and the right lifting pipe 7, and finally is introduced from the right gas injection pipe mechanism 10 into the reaction solution on the right side of the partition plate 4 to react with the reaction solution;

[0079] S7 After reacting for a predetermined time, first disconnect the left lifting pipe 6 from the chlorine gas source, wait for a period of time and then turn off the air pump 12, and discharge the reaction solution from the reaction kettle 1 to carry out an acidification crystallization process to obtain 2-chloronicotinic acid.

[0080] The above disclosure is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. An energy-saving synthesis device for 2-chloronicotinic acid, comprising a reaction kettle; characterized in that, it further comprises a preparation component; The preparation component includes a kettle cover, a first lifting mechanism, a partition board, a reduction motor, a left lifting pipe, a right lifting pipe, a second lifting mechanism, a left air supply pipe mechanism, a right air supply pipe mechanism, a bent docking pipe, an air pump, a connecting pipe, a docking head and a tail pipe; The kettle cover is located on the top of the reaction kettle, and the kettle cover has two receiving grooves; the first lifting mechanism is fixedly arranged on the reaction kettle for driving the kettle cover to lift; the partition board is rotatably arranged at the bottom of the kettle cover; the reduction motor is fixedly arranged on the top of the kettle cover, and the output end of the reduction motor is fixedly connected with the partition board; the left lifting pipe is slidably arranged on the kettle cover and passes through the kettle cover; the right lifting pipe is slidably arranged on the kettle cover and passes through the kettle cover; the second lifting mechanism is fixedly arranged on the kettle cover for driving the left lifting pipe and the right lifting pipe to lift; the left air supply pipe mechanism is connected and communicated at the bottom of the left lifting pipe; the right air supply pipe mechanism is connected and communicated at the bottom of the right lifting pipe; the bent docking pipe is connected and communicated at the top of the right lifting pipe; the air pump is fixedly arranged on the top of the kettle cover; the connecting pipe is communicated with the air pump, fixedly connected with the kettle cover and passes through the kettle cover; the docking head is connected and communicated on the air pump; the tail pipe is fixedly arranged on the kettle cover and passes through the kettle cover.

2. The energy-saving synthesis device for 2-chloronicotinic acid according to claim 1, characterized in that, The preparation component further includes a first annular sealing gasket and a second annular sealing gasket; The first annular sealing gasket is fixedly arranged at the bottom of the kettle cover; the second annular sealing gasket is fixedly arranged inside the docking head.

3. The energy-saving synthesis device for 2-chloronicotinic acid according to claim 2, characterized in that, The first lifting mechanism includes two first mounting blocks, two first hydraulic cylinders and two ear plates; The two first mounting blocks are respectively fixedly arranged on the side of the reaction kettle; the two first hydraulic cylinders are respectively fixedly arranged on the two first mounting blocks; the two ear plates are respectively fixedly connected with the kettle cover, respectively fixedly connected with the output ends of the two first hydraulic cylinders, and are respectively located on the side of the kettle cover.

4. The energy-saving synthesis device for 2-chloronicotinic acid according to claim 3, characterized in that, The partition board includes a mounting shaft and a plate body; The mounting shaft is rotatably connected with the kettle cover, fixedly connected with the output end of the reduction motor and passes through the kettle cover; the plate body is fixedly arranged on the mounting shaft.

5. The energy-saving synthesis device for 2-chloronicotinic acid according to claim 4, characterized in that, The second lifting mechanism includes a second mounting block, a second hydraulic cylinder and a connecting frame; The second mounting block is fixedly arranged on the side of the kettle cover; the second hydraulic cylinder is fixedly arranged on the second mounting block; the connecting frame is fixedly connected with the output end of the second hydraulic cylinder, respectively fixedly connected with the left lifting pipe and the right lifting pipe, and is located on the top of the second hydraulic cylinder.

6. An energy-saving synthesis device for 2-chloronicotinic acid according to claim 5, characterized in that the second lifting mechanism further includes a reinforcing frame; the reinforcing frame is fixedly connected to the connecting frame and fixedly connected to the bent docking pipe, and is located on one side of the connecting frame.

7. An energy-saving synthesis device for 2-chloronicotinic acid according to claim 6, characterized in that the left air supply pipe mechanism includes a left main pipe and a plurality of left perforated branch pipes; the left main pipe is communicatively arranged at the bottom of the left lifting pipe; the plurality of left perforated branch pipes are respectively communicatively arranged on the left main pipe.

8. An energy-saving synthesis device for 2-chloronicotinic acid according to claim 7, characterized in that the right air supply pipe mechanism includes a right main pipe and a plurality of right perforated branch pipes; the right main pipe is communicatively arranged at the bottom of the right lifting pipe; the plurality of right perforated branch pipes are respectively communicatively arranged on the right main pipe.

9. An energy-saving synthesis method of 2-chloronicotinic acid, which is applied to an energy-saving synthesis device of 2-chloronicotinic acid as described in any one of claims 1 to 8; characterized in that, including: dissolving nicotinic acid and a catalyst in a solvent to prepare a reaction solution; the first lifting mechanism drives the kettle lid to rise, adds the reaction solution into the reaction kettle, and then drives the kettle lid to move down and reset by the first lifting mechanism. The reaction kettle heats the reaction solution to a set temperature and keeps it warm; connect the left lifting pipe to a chlorine gas source and start the air pump. Chlorine gas is introduced into the reaction solution on the left side of the partition from the left air supply pipe mechanism and reacts with the reaction solution. The unreacted chlorine gas, under the action of the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced into the reaction solution on the right side of the partition from the right air supply pipe mechanism and reacts with the reaction solution; after a predetermined reaction time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time and then turn off the air pump. The second lifting mechanism drives the left lifting pipe and the right lifting pipe to rise, and finally drives the left air supply pipe mechanism and the right air supply pipe mechanism to move up and be respectively received in two receiving grooves. The bent docking pipe is separated from the docking head, and the reduction motor is started to drive the partition to rotate 180 degrees; the second lifting mechanism drives the left lifting pipe and the right lifting pipe to descend, and finally drives the left air supply pipe mechanism and the right air supply pipe mechanism to move down and reset. The bent docking pipe is re-docked and communicated with the docking head; connect the left lifting pipe to a chlorine gas source and start the air pump. Chlorine gas is introduced into the reaction solution on the left side of the partition from the left air supply pipe mechanism and reacts with the reaction solution. The unreacted chlorine gas, under the action of the air pump, sequentially passes through the bent docking pipe and the right lifting pipe, and finally is introduced into the reaction solution on the right side of the partition from the right air supply pipe mechanism and reacts with the reaction solution; after a predetermined reaction time, first disconnect the left lifting pipe from the chlorine gas source, wait for a period of time and then turn off the air pump, and discharge the reaction solution from the reaction kettle to carry out an acidification crystallization process to obtain 2-chloronicotinic acid.

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