Filtrate treatment device for production of methylsulfonylbenzoic acid

Abstract

The utility model relates to a filtrate treatment device for producing methylsulfonylbenzoic acid, which comprises a filtrate recovery tank and an overflow pipe arranged on the side wall of the filtrate recovery tank, and is characterized in that the tail end of the overflow pipe is connected with the top of a first enamel tank, the top of the first enamel tank is additionally provided with a nitric acid feeding port, the first enamel tank is provided with a pH value detection sensor, and the pH value detection sensor is connected with the overflow pipe. A solid-liquid mixture recovery opening in the bottom of the filtrate recovery tank is communicated with an inlet pipeline of a first lift pump, the tail end of an outlet pipeline of the first lift pump is communicated with the upper part of a second enamel tank, a second horizontal filter screen layer is arranged in the middle of the second enamel tank, a secondary liquid outlet is formed in the bottom of the second enamel tank, and the secondary liquid outlet is communicated with an inlet pipeline of a second lift pump; the tail end of an outlet pipeline of the second lift pump is communicated with the overflow pipe, a hollow heating plate is arranged below the second horizontal filter screen layer, and a plurality of filtrate through holes are uniformly formed between the upper surface and the lower surface of the hollow heating plate. The device greatly reduces the water consumption and raw material consumption of a reaction system, and is high in utilization rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to methyl sulfonyl benzoic acid production equipment technical field, concretely relates to a kind of filtrate treatment devices for methyl sulfonyl benzoic acid production. BACKGROUND

[0002] Methyl sulfonyl benzoic acid, herein refers to 2-nitro-4-methyl sulfonyl benzoic acid. It is a carboxylic acid derivative, white or light yellow crystalline powder at room temperature, soluble in ethanol, dichloromethane and ether and other organic solvents, slightly soluble in water. The product is an important intermediate for the synthesis of mesotrione, which is an excellent herbicide and has been widely used worldwide. In addition, 2-nitro-4-methyl sulfonyl benzoic acid is also widely used in dye, pharmaceutical and other industries.

[0003] In the production of 2-nitro-4-methyl sulfonyl benzoic acid, 2-nitro-4-methyl sulfonyl toluene can be used as raw material, water, oxygen and nitric acid are added to reach the reaction temperature, and appropriate amount of oxygen is supplemented during the reaction. After the reaction is completed, the reaction is cooled, the reaction is filtered to obtain filter cake, and the filter cake is dried to obtain the target product 2-nitro-4-methyl sulfonyl benzoic acid. In the above production process, a large amount of filtrate is produced, and the filtrate is acidic. Direct discharge will cause environmental pollution and resource waste, and should be recycled.

[0004] CN 218221469 U discloses a filtrate recycling system, characterized in that: the squeezing filtrate pipe and the cloth washing filtrate pipe at the bottom of the plate and frame filter press are connected to the filtrate recovery tank, the filtrate recovery tank bottom filtrate delivery pipe is connected to the filter inlet through the filtrate delivery pump, and the filter bottom recovery pipe is connected to the slurry recovery tank. An overflow pipe is provided on the upper part of the filter, and the overflow pipe is connected to a washing water bucket. All filtrates generated during the entire operation of the plate and frame filter press are recovered and reused after separation, saving water consumption and meeting energy saving requirements. However, when applied to the present application, the following problems exist: the filtrate cannot be treated deeply, cannot be recycled to the original reaction system, can only be used as cleaning water, and cannot reduce the water consumption and raw material consumption of the reaction system. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above-mentioned problems, and provides a methyl sulfonyl benzoic acid production filtrate treatment device with reasonable structure and reliable use, which greatly reduces the water consumption and raw material consumption of the reaction system and has high utilization rate.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of methanesulfonate benzoic acid production filtrate treatment device, including filtrate recovery tank, the first horizontal filter screen layer is equipped in the middle part of the filtrate recovery tank, the top of the filtrate recovery tank is equipped with liquid inlet pipeline, the inner end of the liquid inlet pipeline is inserted below the first horizontal filter screen layer, overflow pipe is equipped on the sidewall of the filtrate recovery tank, its technical key points are: the end of the overflow pipe is connected with the top of the first porcelain jar, the top of the first porcelain jar is additionally equipped with nitric acid feeding port, stirring mechanism is equipped in the first porcelain jar, the first porcelain jar is equipped with the pH value detection sensor of detection end inserted into liquid layer, the bottom of the first porcelain jar is equipped with recycling port, the bottom of the filtrate recovery tank is equipped with solid-liquid mixture recovery port and solid-liquid mixture recovery port is communicated with the inlet pipeline of first pump, the outlet pipeline end of the first pump is communicated with the upper portion of second porcelain jar, the second horizontal filter screen layer is equipped in the middle part of the second porcelain jar, the bottom of the second porcelain jar is equipped with secondary liquid outlet, the secondary liquid outlet is communicated with the inlet pipeline of second pump, the outlet pipeline end of the second pump is communicated with overflow pipe using tee, the second horizontal filter screen layer is equipped below hollow heating plate, and a plurality of filtrate through-holes are uniformly equipped between the upper surface and the lower surface of the hollow heating plate.

[0008] The above-mentioned methanesulfonate benzoic acid production filtrate treatment device, the sidewall of the second porcelain jar is equipped with heating medium inlet and heating medium outlet communicated with hollow heating plate.

[0009] The above-mentioned methanesulfonate benzoic acid production filtrate treatment device, the inlet of the overflow pipe is equipped with the first control valve, the outlet pipeline end of the second pump is equipped with the second control valve, the lower end of the solid-liquid mixture recovery port is equipped with the third control valve, and the lower end of the secondary liquid outlet is equipped with the fourth control valve.

[0010] The above-mentioned methanesulfonate benzoic acid production filtrate treatment device, the top of the first porcelain jar is equipped with stirring motor, the stirring mechanism is stirring paddle, and the stirring shaft upper end of the stirring paddle is connected and fixed with the output end of stirring motor.

[0011] The above-mentioned methanesulfonate benzoic acid production filtrate treatment device, the top of the second porcelain jar is equipped with moisture discharge port.

[0012] The utility model has the advantages that:

[0013] 1, the upper layer filtrate of filtrate recovery tank enters into the first porcelain jar through overflow pipe, the pH value of filtrate can be detected through pH value detection sensor, according to feedback value, add nitric acid through nitric acid feeding port, and stir uniformly through stirring mechanism, since filtrate itself is acidic, so only a small amount of nitric acid can be added, after filtrate reaches the set pH value, can be returned to methanesulfonate benzoic acid production system for next oxidation operation, also avoid the generation of a large amount of acidic wastewater, achieve the purpose of energy saving and environmental protection.

[0014] 2. The solid-liquid mixture filtered through the first horizontal filter layer is led to the second enamel tank by the first lift pump. After solid-liquid separation through the second horizontal filter layer, the liquid portion is led to the overflow pipe by the second lift pump as needed. The solid portion, mainly the target product 2-nitro-4-methylsulfonyl benzoic acid, is dried by heating with the heating medium in the hollow heating plate and collected in a timely manner, further reducing production costs. In summary, this invention significantly reduces the water and raw material consumption of the reaction system, resulting in high utilization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0017] Figure 3 yes Figure 1 Enlarged view of section B in the middle.

[0018] In the diagram: 1. Second enamel tank, 2. Exhaust port, 3. Filtrate recovery tank, 4. Inlet pipe, 5. First pump, 6. Solid-liquid mixture recovery port, 7. Third control valve, 8. First control valve, 9. Overflow pipe, 10. Second control valve, 11. Nitric acid feed port, 12. Stirring motor, 13. pH sensor, 14. First enamel tank, 15. Stirring paddle, 16. Reuse port, 17. Second pump, 18. Fourth control valve, 19. Secondary liquid outlet, 20. First horizontal filter layer, 21. Heating medium inlet, 22. Second horizontal filter layer, 23. Hollow heating plate, 24. Filtrate through hole, 25. Heating medium outlet. Detailed Implementation

[0019] The present invention will be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-3 As shown, the filtrate treatment device for the production of sulfone benzoic acid includes a filtrate recovery tank 3. A first horizontal filter screen layer 20 is provided in the middle of the filtrate recovery tank 3, and an inlet pipe 4 is provided at the top of the filtrate recovery tank 3. The inner end of the inlet pipe 4 is inserted below the first horizontal filter screen layer 20. An overflow pipe 9 is provided on the side wall of the filtrate recovery tank 3, which is positioned higher than the first horizontal filter screen layer 20.

[0021] The end of the overflow pipe 9 is connected with the top of the first porcelain tank 14, the top of the first porcelain tank 14 is additionally provided with a nitric acid feeding port 11, the first porcelain tank 14 is internally provided with a stirring mechanism, the first porcelain tank 14 is provided with a pH value detection sensor 13 with a detection end inserted into a liquid layer, and the bottom of the first porcelain tank 14 is provided with a recycling port 16. In the embodiment, the top of the first porcelain tank 14 is provided with a stirring motor 12, the stirring mechanism is a stirring paddle 15, and the upper end of the stirring shaft of the stirring paddle 15 is fixedly connected with the output end of the stirring motor 12.

[0022] The bottom of the filtrate recovery tank 3 is provided with a solid-liquid mixture recovery port 6 in communication with the inlet pipeline of the first lifting pump 5, the outlet pipeline of the first lifting pump 5 is in communication with the upper part of the second porcelain tank 1, and the middle part of the second porcelain tank 1 is provided with a second horizontal filter screen layer 22. The bottom of the second porcelain tank 1 is provided with a secondary liquid outlet 19 in communication with the inlet pipeline of the second lifting pump 17, and the outlet pipeline of the second lifting pump 17 is in communication with the overflow pipe 9 through a three-way joint.

[0023] The second horizontal filter screen layer 22 is provided below with a hollow heating plate 23, and a plurality of filtrate through holes 24 are uniformly arranged between the upper surface and the lower surface of the hollow heating plate 23. In the embodiment, the sidewall of the second porcelain tank 1 is provided with a heating medium inlet 21 and a heating medium outlet 25 in communication with the hollow heating plate 23. The top of the second porcelain tank 1 is provided with a moisture discharge port 2.

[0024] In the embodiment, the inlet of the overflow pipe 9 is provided with a first control valve 8, the outlet pipeline of the second lifting pump 17 is provided with a second control valve 10, the lower end of the solid-liquid mixture recovery port 6 is provided with a third control valve 7, and the lower end of the secondary liquid outlet 19 is provided with a fourth control valve 18.

[0025] Working principle:

[0026] In operation, the methanesulfonylbenzoic acid production filtrate passes through the liquid inlet pipeline 4 and the first horizontal filter screen layer 20 into the lower cavity of the filtrate recovery tank 3, and in the process of rising of the liquid surface, the first horizontal filter screen layer 20 intercepts the rising of the solid substances and enters the first porcelain tank 14 through the overflow pipe 9. The pH value detection sensor 13 detects the pH value of the filtrate in real time, nitric acid is added through the nitric acid feeding port 11 according to the feedback value, and the stirring mechanism is used for stirring, the filtrate reaches the set pH value, and is discharged to the methanesulfonylbenzoic acid production system through the recycling port 16 for the next oxidation operation.

[0027] The first lifting pump 5 is started, and the solid-liquid mixture under the first horizontal filter screen layer 20 enters the upper part of the second porcelain tank 1, and after solid-liquid separation through the second horizontal filter screen layer 22, the liquid part is introduced to the overflow pipe 9 in time through the second lifting pump 17, and the solid part, mainly the target product 2-nitro-4-methylsulfonylbenzoic acid, is dried by heating medium in the hollow heating plate 23, the generated moisture is discharged through the moisture discharge port 2, and finally the dried solid substances are collected.

[0028] The above describes the embodiments of the present application in detail, but the content is only the preferred embodiments of the present application, and cannot be considered to limit the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the scope of the present application.

Claims

1. A filtrate treatment device for methanesulfonylbenzoic acid production, comprising a filtrate recovery tank, a first horizontal filter screen layer is arranged in the middle of the filtrate recovery tank, a liquid inlet pipeline is arranged at the top of the filtrate recovery tank, the inner end of the liquid inlet pipeline is inserted below the first horizontal filter screen layer, and an overflow pipe is arranged on the sidewall of the filtrate recovery tank and is higher than the first horizontal filter screen layer. The end of the overflow pipe is connected with the top of the first porcelain tank, the top of the first porcelain tank is additionally provided with a nitric acid feeding port, the first porcelain tank is provided with a stirring mechanism, the first porcelain tank is provided with a pH value detection sensor with a detection end inserted into a liquid layer, the bottom of the first porcelain tank is provided with a recycling port, the bottom of the filtrate recovery tank is provided with a solid-liquid mixture recycling port, the solid-liquid mixture recycling port is communicated with the inlet pipeline of the first pump, the outlet pipeline of the first pump is communicated with the upper part of the second porcelain tank, the middle part of the second porcelain tank is provided with a second horizontal filter screen layer, the bottom of the second porcelain tank is provided with a secondary liquid outlet, the secondary liquid outlet is communicated with the inlet pipeline of the second pump, the outlet pipeline of the second pump is communicated with the overflow pipe through a tee joint, the hollow heating plate is arranged below the second horizontal filter screen layer, and a plurality of filtrate through holes are uniformly arranged between the upper surface and the lower surface of the hollow heating plate.

2. The filtrate treatment device for methanesulfonylbenzoic acid production according to claim 1, characterized by: The side wall of the second porcelain tank is provided with a heating medium inlet and a heating medium outlet communicated with the hollow heating plate.

3. The filtrate treatment device for methanesulfonylbenzoic acid production according to claim 1, characterized by: The inlet of the overflow pipe is provided with a first control valve, the outlet pipeline of the second pump is provided with a second control valve, the lower end of the solid-liquid mixture recycling port is provided with a third control valve, and the lower end of the secondary liquid outlet is provided with a fourth control valve.

4. The filtrate treatment device for methanesulfonylbenzoic acid production according to claim 1, characterized by: The top of the first porcelain tank is provided with a stirring motor, the stirring mechanism is a stirring paddle, and the upper end of the stirring shaft of the stirring paddle is connected and fixed with the output end of the stirring motor.

5. The filtrate treatment device for methanesulfonylbenzoic acid production according to claim 1, characterized by: The top of the second porcelain tank is provided with a moisture discharge port.

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