Step-by-step chlorination method capable of reducing chlorination impurities

Abstract

The invention discloses a step-by-step chlorination process capable of reducing chlorination impurities, and relates to the technical field of chlorination processes, and the chlorination process comprises the following steps: step 1, sequentially putting raw materials into a crushing and grinding device and a mixing device, and carrying out pretreatment in a fine grinding and mixing form on the raw materials; 2, primary chlorination: introducing a small amount of chlorine into a reaction device at 70-95 DEG C, carrying out a primary reaction on the chlorine and the raw materials to generate an intermediate product, strictly controlling the chlorine flow and the reaction temperature in the step, and avoiding a violent reaction or generation of byproducts; and step 3, intermediate treatment: putting the preliminary chlorination product into a filtering device, and physically separating and purifying the preliminary chlorination product by using a physical method so as to remove impurities or adjust the form of the product. And therefore, the yield and the product quality are influenced due to the fact that the amount of generated chloride is relatively high.

Description

Technical Field

[0001] The invention relates to the technical field of chlorination process, in particular to a step-by-step chlorination process capable of reducing chlorinated impurities. Background Art

[0002] Chlorination is a chemical method that uses chlorine gas or chlorinating agents to chlorinate substances. This method can be divided into several different types according to the different means of promoting the chlorination reaction, including thermal chlorination, photochlorination and catalytic chlorination. Thermal chlorination provides energy by heating to dissociate chlorine molecules into chlorine free radicals, which then react with hydrocarbon molecules to generate various chlorine derivatives.

[0003] For example, the Chinese authorized patent with announcement number CN117488101A (a method for boiling chlorination of carbonized slag and a chlorination device thereof): the chlorination method comprises S1: finely grinding the carbonized slag after high-temperature carbonization reduction and water quenching; S2: adding the finely ground carbonized slag into a boiling chlorination reactor, introducing gas, and boiling chlorinating the finely ground carbonized slag; S3: cooling the chlorinated tailings produced after boiling chlorination, and circulating them into the boiling chlorination reactor to maintain the heat balance in the boiling chlorination reactor; the present invention effectively improves the utilization rate of titanium element in the carbonized slag and improves the economy of the whole process; by fine grinding, the particle size distribution of the carbonized slag is narrowed, the particle size of the carbonized slag is reduced, and the high gas velocity rapid chlorination of the carbonized slag is achieved, the contact probability of the carbonized slag with chlorine is enhanced to increase the reaction speed, the residence time of the carbonized slag in the boiling chlorination reactor is shortened, and the chlorination efficiency of the carbonized slag and the production capacity of a single boiling chlorination reactor are improved.

[0004] However, the chlorination method in the above-mentioned prior art always maintains a relatively high chlorination temperature during the chlorination process, which leads to a relatively high amount of chloride produced, affecting the yield and product quality; therefore, it does not meet the existing needs. In this regard, we propose a step-by-step chlorination method that can reduce chlorinated impurities. Summary of the invention

[0005] The object of the present invention is to provide a step-by-step chlorination method capable of reducing chlorinated impurities, so as to solve the problem that the chlorination method in the prior art proposed in the above-mentioned background technology always maintains a relatively high chlorination temperature during the chlorination process, which leads to a relatively high amount of chloride produced, affecting the yield and product quality.

[0006] To achieve the above object, the present invention provides the following technical solution: a step-by-step chlorination method for reducing chlorinated impurities, comprising the following steps:

[0007] Step 1: Put the raw materials into the crushing and grinding device and the mixing device in turn to pre-treat the raw materials in the form of grinding and mixing;

[0008] Step 2: Preliminary chlorination: a small amount of chlorine is introduced into the reaction device at 70-95°C to react with the raw materials to generate intermediate products. In this step, the chlorine flow rate and reaction temperature are strictly controlled to avoid violent reactions or the generation of by-products.

[0009] Step 3: intermediate treatment, placing the preliminary chlorination product into a filtering device, and using physical methods to physically separate and purify the preliminary chlorination product to remove impurities or adjust the product form;

[0010] Step 4: On the basis of the intermediate treatment, the secondary chlorination temperature is raised to 95-105°C, and chlorine is continuously introduced for deep chlorination reaction to make the product reach the required chemical structure and purity. The reaction conditions are also strictly and accurately controlled to ensure the smooth progress of the reaction and reduce the generation of by-products;

[0011] Step 5: Final chlorination, heating the reaction device to 105-140°C for final chlorination reaction;

[0012] Step 6: Post-treatment The deep chlorination product is finally treated by drying it with a drying device and then packaged to obtain a finished product that meets the requirements.

[0013] Preferably, the crushing and grinding device and the reaction device in the above-mentioned step one and step two include a crushing and grinding machine and a chlorination reactor, the bottom of the crushing and grinding device is provided with a first support seat, the bottom of the chlorination reactor is provided with a second support seat, the bottoms of the first support seat and the second support seat are provided with supporting legs around them, a first base is provided on one side of the upper surface of the first support seat, and a second base is provided on one side of the first base.

[0014] Preferably, the front end surfaces of the first base and the second base are both provided with control devices, a conveying bin is provided between the first base and the second base, and a discharge trough is provided on one side of the second base.

[0015] Preferably, a crushing jar is arranged above the first base, a grinding jar is arranged on the top of the second base, top covers are installed on the tops of the crushing jar and the grinding jar, and a cylinder is arranged on the upper surface of the top cover.

[0016] Preferably, a reaction tank is arranged above the second support seat, a sealing cover is arranged on the top of the reaction tank, and a motor is installed on the upper surface of the sealing cover.

[0017] Preferably, a solid material pipe is provided on one side of the motor, a liquid material pipe is provided on the other side of the motor, and a thermometer is provided on one side of the liquid material pipe.

[0018] Preferably, a first crushing rod is provided inside the crushing tank, a second crushing rod is provided above the first crushing rod, crushing knives are installed on both sides of the first crushing rod and the second crushing rod, an insertion interface is provided inside the bottom end of the first crushing rod, and a connecting rod is provided at the bottom of the second crushing rod, and the first crushing rod is connected to the connecting rod of the second crushing rod through the insertion interface.

[0019] Preferably, a telescopic rod is provided inside the grinding jar, a driver is provided at the bottom of the telescopic rod, a pressure plate is provided around the driver, and a grinding disc is installed at the bottom of the pressure plate.

[0020] Preferably, discharge ports are provided on both sides of the bottom of the reaction tank, a heating wall is provided inside the inner wall of the reaction tank, a rotating shaft is provided inside the reaction tank, scrapers are provided on both sides of the bottom of the rotating shaft, and stirring rods are installed on both side end faces of the rotating shaft.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention introduces a small amount of chlorine into a reaction device under the condition of 70-95° C. through preliminary chlorination, and reacts with raw materials to generate intermediate products. In this step, the chlorine flow rate and reaction temperature are strictly controlled to avoid violent reaction or generation of by-products; in the intermediate treatment, the preliminary chlorinated product is placed in a filtering device, and the preliminary chlorinated product is physically separated and purified by a physical method to remove impurities or adjust the product form; on the basis of the intermediate treatment, the secondary chlorination temperature is raised to 95-105° C., and chlorine is continuously introduced to perform a deep chlorination reaction, so that the product reaches the required chemical structure and purity, and the reaction conditions are also strictly and accurately controlled to ensure that the reaction proceeds smoothly and reduce the generation of by-products; in the final chlorination, the reaction device is heated to 105-140° C. for the final chlorination reaction, and the chlorination operation is performed by three-stage heating to reduce the generation of chlorides, improve the yield and product quality, and solve the problem that the chlorination method in the prior art always maintains a relatively high chlorination temperature during the chlorination process, which leads to a relatively high amount of chlorides generated, affecting the yield and product quality.

[0023] 2. A crushing and grinding machine is set up with a crushing tank and a grinding tank on the top, and the raw materials are placed inside the crushing tank. After the top cover is sealed, the first crushing rod is plugged and connected with the plug interface at the top of the second crushing rod by using the plug-in rod. The motor drives the crushing rod to rotate, so that the crushing knife is used for crushing. After the processing is completed, it enters the interior of the grinding tank through the conveying bin. The cylinder drives the telescopic rod to drive the pressure plate to press down and press the top of the material. The driver drives the grinding disc to rotate for grinding operation. The ground raw materials are discharged through the discharge trough. The crushed raw materials are convenient for subsequent chlorination operations.

[0024] 3. Scrapers are arranged on both sides of the bottom of the rotating shaft inside the reaction tank, the scrapers are in contact with the top of the discharge port, stirring rods are arranged on both sides of the rotating shaft, the treated raw materials are poured into the interior of the reaction tank and the chlorinating agent is added, and the stirring rods are used for mixing to introduce chlorine atoms into the compound. During the reaction, the heating wall of the inner wall is used for staged temperature increase operation to ensure the quality of chlorination. After the chlorination is completed, the scraper is used to facilitate the unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the staged chlorination step of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the crushing and grinding machine of the present invention;

[0027] Figure 3 It is a schematic diagram of the overall structure of the chlorination reactor of the present invention;

[0028] Figure 4 It is an enlarged schematic diagram of the crushing rod structure of the present invention;

[0029] Figure 5 It is an enlarged schematic diagram of the local structure inside the grinding jar of the present invention;

[0030] Figure 6 It is an enlarged schematic diagram of the local structure inside the reaction tank of the present invention;

[0031] In the figure: 1. crushing and grinding machine; 2. chlorination reactor; 3. first support seat; 4. first base; 5. second base; 6. crushing tank; 7. grinding tank; 8. top cover; 9. cylinder; 10. control device; 11. conveying bin; 12. discharge chute; 13. second support seat; 14. reaction tank; 15. sealing cover; 16. motor; 17. solid material pipe; 18. liquid material pipe; 19. thermometer; 20. first crushing rod; 21. second crushing rod; 22. crushing knife; 23. plug interface; 24. plug rod; 25. telescopic rod; 26. driver; 27. pressure plate; 28. grinding disc; 29. ​​discharge port; 30. rotating shaft; 31. heating wall; 32. scraper; 33. stirring rod. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] See also Figure 1-6 , an embodiment provided by the present invention: a step-by-step chlorination method for reducing chlorinated impurities, comprising the following steps:

[0034] Step 1: Put the raw materials into the crushing and grinding device and the mixing device in turn to pre-treat the raw materials in the form of grinding and mixing;

[0035] Step 2: Preliminary chlorination: a small amount of chlorine is introduced into the reaction device at 70-95°C to react with the raw materials to generate intermediate products. In this step, the chlorine flow rate and reaction temperature are strictly controlled to avoid violent reactions or the generation of by-products.

[0036] Step 3: intermediate treatment, placing the preliminary chlorination product into a filtering device, and using physical methods to physically separate and purify the preliminary chlorination product to remove impurities or adjust the product form;

[0037] Step 4: On the basis of the intermediate treatment, the secondary chlorination temperature is raised to 95-105°C, and chlorine is continuously introduced for deep chlorination reaction to make the product reach the required chemical structure and purity. The reaction conditions are also strictly and accurately controlled to ensure the smooth progress of the reaction and reduce the generation of by-products;

[0038] Step 5: Final chlorination, heating the reaction device to 105-140°C for final chlorination reaction;

[0039] Step 6: Post-treatment The deep chlorination product is finally treated, dried by a drying device and then packaged to obtain a finished product that meets the requirements. The chlorination operation is carried out by three-stage heating to reduce the production of chloride, improve the yield and product quality, and solve the problem that the chlorination method in the prior art always maintains a relatively high chlorination temperature during the chlorination process, which leads to a relatively high amount of chloride production, affecting the yield and product quality. By setting a crushing and grinding machine 1, a crushing tank 6 and a grinding tank 7 are set on the top, and the raw materials are placed inside the crushing tank 6. After that, the top cover 8 is sealed so that the first crushing rod 20 is plugged and connected with the plug interface 23 at the top of the second crushing rod 21 by the plug rod 24, and the motor 16 drives the crushing rod to rotate, so that the crushing knife 22 is used for crushing. After the treatment is completed, it enters the interior of the grinding tank 7 through the conveying bin 11. The cylinder 9 drives the telescopic rod 25 to drive the pressure plate 27 to press down and press the top of the material. The driver 26 drives the grinding disc 28 to rotate for grinding operation. The ground raw material is discharged through the discharge trough 12. The crushed raw material is convenient for subsequent chlorination operation. Scrapers 32 are arranged on both sides of the bottom of the rotating shaft 30 inside the reaction tank 14. The scraper 32 contacts the top of the discharge port 29. Stirring rods 33 are arranged on both sides of the rotating shaft 30. The treated raw material is poured into the interior of the reaction tank 14 and the chlorinating agent is added. The stirring rod 33 is used to mix so as to introduce chlorine atoms into the compound. During the reaction, the heating wall 31 of the inner wall is used to perform a staged heating operation to ensure the quality of chlorination. After the chlorination is completed, the scraper 32 is used to facilitate unloading.

[0040] See also Figure 1-Figure 6 The crushing and grinding device and the reaction device in the above step 1 and step 2 include a crushing and grinding machine 1 and a chlorination reactor 2. A first support seat 3 is arranged at the bottom of the crushing and grinding machine 1, and a second support seat 13 is arranged at the bottom of the chlorination reactor 2. Support legs are arranged around the bottoms of the first support seat 3 and the second support seat 13. A first base 4 is arranged on one side of the upper surface of the first support seat 3, and a second base 5 is arranged on one side of the first base 4.

[0041] See also Figure 1-Figure 6 The front end surfaces of the first base 4 and the second base 5 are both provided with a control device 10, a conveying bin 11 is provided between the first base 4 and the second base 5, and a discharge trough 12 is provided on one side of the second base 5. A small amount of chlorine is introduced into the reaction device at 70-95°C to react with the raw materials to generate an intermediate product. This step strictly controls the chlorine flow rate and reaction temperature to avoid violent reactions or the generation of by-products; in the intermediate treatment, the preliminary chlorination product is placed in a filtering device, and the preliminary chlorination product is physically separated and purified by a physical method to remove impurities or adjust the product form; in the intermediate treatment On the basis of the secondary chlorination temperature is raised to 95 ~ 105 ℃, chlorine is continuously introduced for deep chlorination reaction, so that the product reaches the required chemical structure and purity, and the reaction conditions are also strictly controlled and precisely controlled to ensure the smooth progress of the reaction and reduce the generation of by-products; for the final chlorination, the reaction device is heated to 105 ~ 140 ℃ for the final chlorination reaction, and the chlorination operation is carried out by three-stage heating to reduce the generation of chlorides, improve the yield and product quality, and solve the problem of the chlorination method in the prior art maintaining a relatively high chlorination temperature during the chlorination process, which leads to a relatively high amount of chlorides generated. High, affecting the yield and product quality, by setting a crushing and grinding machine 1, a crushing tank 6 and a grinding tank 7 are set on the top, the raw material is placed in the crushing tank 6, and then the top cover 8 is sealed so that the first crushing rod 20 is plugged and connected with the plug interface 23 at the top of the second crushing rod 21 by using the plug rod 24, and the motor 16 drives the crushing rod to rotate, so that the crushing knife 22 is used for crushing. After the processing is completed, it enters the interior of the grinding tank 7 through the conveying bin 11, and the cylinder 9 drives the telescopic rod 25 to drive the pressure plate 27 to press down and press the top of the material, and the driver 26 drives the grinding disc 28 to rotate The grinding operation is carried out, and the ground raw materials are discharged through the discharge trough 12. The crushed raw materials are convenient for the subsequent chlorination operation. Scrapers 32 are arranged on both sides of the bottom of the rotating shaft 30 inside the reaction tank 14. The scrapers 32 are in contact with the top of the discharge port 29. Stirring rods 33 are arranged on both sides of the rotating shaft 30. The processed raw materials are poured into the interior of the reaction tank 14 and the chlorinating agent is added. The stirring rods 33 are used for mixing to introduce chlorine atoms into the compound. During the reaction, the heating wall 31 of the inner wall is used for staged heating operation to ensure the quality of chlorination. After the chlorination is completed, the scrapers 32 are used for convenient unloading.

[0042] See also Figure 1-Figure 6 A crushing tank 6 is arranged above the first base 4, a grinding tank 7 is arranged on the top of the second base 5, and a top cover 8 is installed on the top of the crushing tank 6 and the grinding tank 7, and a cylinder 9 is arranged on the upper surface of the top cover 8.

[0043] See also Figure 1-Figure 6 A reaction tank 14 is disposed above the second support seat 13 , a sealing cover 15 is disposed on the top of the reaction tank 14 , and a motor 16 is installed on the upper surface of the sealing cover 15 .

[0044] See also Figure 1-Figure 6 A solid material pipe 17 is provided on one side of the motor 16, a liquid material pipe 18 is provided on the other side of the motor 16, and a thermometer 19 is provided on one side of the liquid material pipe 18. The treated raw materials are poured into the interior of the reaction tank 14 and the chlorinating agent is added, and the stirring rod 33 is used to mix to introduce chlorine atoms into the compound. During the reaction, the heating wall 31 of the inner wall is used to perform a staged heating operation to ensure the chlorination quality. After the chlorination is completed, the scraper 32 is used to facilitate the unloading, and the thermometer 19 is used to facilitate the observation of the heating process. The solid material pipe 17 and the liquid material pipe 18 are convenient for adding different additives and raw materials.

[0045] See also Figure 1-Figure 6 A first crushing rod 20 is arranged inside the crushing tank 6, and a second crushing rod 21 is arranged above the first crushing rod 20. Crushing knives 22 are installed on both sides of the first crushing rod 20 and the second crushing rod 21. A plug-in interface 23 is arranged inside the bottom end of the first crushing rod 20, and a plug-in rod 24 is arranged at the bottom of the second crushing rod 21. The first crushing rod 20 is plugged and connected with the plug-in rod 24 of the second crushing rod 21 through the plug-in interface 23, and the raw material is placed inside the crushing tank 6. After that, the top cover 8 is sealed so that the first crushing rod 20 is plugged and connected with the plug-in interface 23 at the top end of the second crushing rod 21 by the plug-in rod 24. The motor 16 drives the crushing rod to rotate, so as to use the crushing knife 22 for crushing processing. After the processing is completed, it enters the interior of the grinding tank 7 through the conveying bin 11. After the cylinder 9 drives the telescopic rod 25 to drive the pressure plate 27 to press down and press the top of the material, the driver 26 drives the grinding disc 28 to rotate for grinding operation, and the ground raw material is discharged through the discharge trough 12, and the crushed raw material is convenient for subsequent chlorination operation.

[0046] See also Figure 1-Figure 6A telescopic rod 25 is provided inside the grinding tank 7, a driver 26 is provided at the bottom of the telescopic rod 25, a pressure plate 27 is provided around the driver 26, and a grinding disc 28 is installed at the bottom of the pressure plate 27. After the processing is completed, it enters the interior of the grinding tank 7 through the conveying bin 11. The cylinder 9 drives the telescopic rod 25 to drive the pressure plate 27 to press down and press the top of the material. Then, the driver 26 drives the grinding disc 28 to rotate for grinding operation. The ground raw materials are discharged through the discharge trough 12, and the crushed raw materials are convenient for subsequent chlorination operations.

[0047] See also Figure 1-Figure 6 , discharge ports 29 are provided on both sides of the bottom of the reaction tank 14, a heating wall 31 is provided inside the inner wall of the reaction tank 14, a rotating shaft 30 is provided inside the reaction tank 14, scrapers 32 are provided on both sides of the bottom of the rotating shaft 30, and stirring rods 33 are installed on both side end surfaces of the rotating shaft 30. The scrapers 32 are in contact with the top of the discharge port 29. The treated raw materials are poured into the interior of the reaction tank 14 and the chlorinating agent is added. The stirring rod 33 is used to mix to introduce chlorine atoms into the compound. During the reaction, the heating wall 31 of the inner wall is used to perform a staged temperature increase operation to ensure the chlorination quality. After the chlorination is completed, the scraper 32 is used to facilitate unloading.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A step-by-step chlorination process for reducing chlorinated impurities, characterized in that: The following steps are involved: Step 1: Put the raw materials into the crushing and grinding device and the mixing device in turn to pre-treat the raw materials in the form of grinding and mixing; Step 2: Preliminary chlorination: a small amount of chlorine is introduced into the reaction device at 70-95°C to react with the raw materials to generate intermediate products. In this step, the chlorine flow rate and reaction temperature are strictly controlled to avoid violent reactions or the generation of by-products. Step 3: intermediate treatment, placing the preliminary chlorination product into a filtering device, and using physical methods to physically separate and purify the preliminary chlorination product to remove impurities or adjust the product form; Step 4: On the basis of the intermediate treatment, the secondary chlorination temperature is raised to 95-105°C, and chlorine is continuously introduced for deep chlorination reaction to make the product reach the required chemical structure and purity. The reaction conditions are also strictly and accurately controlled to ensure the smooth progress of the reaction and reduce the generation of by-products; Step 5: Final chlorination, heating the reaction device to 105-140°C for final chlorination reaction; Step 6: Post-treatment The deep chlorination product is finally treated by drying it with a drying device and then packaged to obtain a finished product that meets the requirements.

2. A step-by-step chlorination method for reducing chlorinated impurities according to claim 1, characterized in that: The crushing and grinding device and the reaction device in the above-mentioned step 1 and step 2 comprise a crushing and grinding machine (1) and a chlorination reactor (2), wherein a first support seat (3) is arranged at the bottom of the crushing and grinding machine (1), and a second support seat (13) is arranged at the bottom of the chlorination reactor (2), support legs are arranged around the bottoms of the first support seat (3) and the second support seat (13), a first base (4) is arranged on one side of the upper surface of the first support seat (3), and a second base (5) is arranged on one side of the first base (4).

3. A step-by-step chlorination method for reducing chlorinated impurities according to claim 2, characterized in that: The front end surfaces of the first base (4) and the second base (5) are both provided with a control device (10), a conveying bin (11) is provided between the first base (4) and the second base (5), and a discharge trough (12) is provided on one side of the second base (5).

4. A step-by-step chlorination method for reducing chlorinated impurities according to claim 3, characterized in that: A crushing tank (6) is arranged above the first base (4), a grinding tank (7) is arranged on the top of the second base (5), and a top cover (8) is installed on the top of each of the crushing tank (6) and the grinding tank (7), and a cylinder (9) is arranged on the upper surface of the top cover (8).

5. A step-by-step chlorination method for reducing chlorinated impurities according to claim 4, characterized in that: A reaction tank (14) is arranged above the second support seat (13), a sealing cover (15) is arranged on the top of the reaction tank (14), and a motor (16) is installed on the upper surface of the sealing cover (15).

6. A step-by-step chlorination method for reducing chlorinated impurities according to claim 5, characterized in that: A solid material pipe (17) is provided on one side of the motor (16), a liquid material pipe (18) is provided on the other side of the motor (16), and a thermometer (19) is provided on one side of the liquid material pipe (18).

7. A step-by-step chlorination method for reducing chlorinated impurities according to claim 6, characterized in that: A first crushing rod (20) is arranged inside the crushing tank (6), a second crushing rod (21) is arranged above the first crushing rod (20), and crushing knives (22) are installed on both sides of the first crushing rod (20) and the second crushing rod (21).

8. A step-by-step chlorination method for reducing chlorinated impurities according to claim 7, characterized in that: An inserting interface (23) is provided inside the bottom end of the first crushing rod (20), and a plugging rod (24) is provided at the bottom of the second crushing rod (21); the first crushing rod (20) is plug-connected to the plugging rod (24) of the second crushing rod (21) via the inserting interface (23).

9. A step-by-step chlorination method for reducing chlorinated impurities according to claim 8, characterized in that: A telescopic rod (25) is arranged inside the grinding jar (7), a driver (26) is arranged at the bottom of the telescopic rod (25), a pressure plate (27) is arranged around the driver (26), and a grinding disc (28) is installed at the bottom of the pressure plate (27).

10. A step-by-step chlorination method for reducing chlorinated impurities according to claim 9, characterized in that: Discharge ports (29) are provided on both sides of the bottom of the reaction tank (14), a heating wall (31) is provided inside the inner wall of the reaction tank (14), a rotating shaft (30) is provided inside the reaction tank (14), scrapers (32) are provided on both sides of the bottom of the rotating shaft (30), and stirring rods (33) are installed on both side end surfaces of the rotating shaft (30).

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