Acid liquor recycling device in nitrobenzene production

Abstract

The utility model relates to the technical field of nitrobenzene production, in particular to an acid liquor recycling device in nitrobenzene production, which comprises an evaporation box, a liquid adding pipe, a condensing pipe and a collecting tank, an evaporation component is mounted at the upper end of the inside of the evaporation box, and a liquid outlet strip is arranged at the upper side of the evaporation component inside the evaporation box. A circulating pipe is arranged on the upper side of the liquid outlet strip, a filtering component is installed at the lower end of the circulating pipe, a liquid inlet pipe is arranged on the lower side of the evaporation box, the evaporation component comprises a heat exchange box, a heat exchange pipe is arranged in the heat exchange box, a heating component is installed at the outer end of the heat exchange pipe, and a heat conduction plate is arranged on the outer side of the heat exchange pipe. The acid liquor is heated and evaporated at a constant temperature through the evaporation component, so that components except acid are prevented from being evaporated along with local overhigh temperature in the acid liquor, the acid liquor separation effect is improved, the acid liquor is circulated and filtered through the filtering component, and impurities in the acid liquor can be cleaned conveniently.

Description

Technical Field

[0001] This utility model relates to the field of nitrobenzene production technology, specifically to an acid recycling device in nitrobenzene production. Background Technology

[0002] Nitrobenzene is an organic compound produced by the nitration reaction of benzene with a mixture of nitric acid and sulfuric acid. It is a key intermediate in many organic synthesis reactions and an important raw material for the production of aniline. It plays a vital role in the organic synthesis industry and is widely used in the manufacture of dyes, fragrances and explosives. In nitrobenzene production, acid recycling devices are used to treat the acid.

[0003] However, current acid recycling devices on the market use an external heating structure to heat and evaporate the acid. This heating structure comes into partial contact with the acid, causing localized overheating. Other components evaporate along with the acid, affecting the separation efficiency and hindering subsequent acid recycling. Furthermore, impurities in the acid accumulate inside the device after processing, becoming more dispersed and making further cleaning difficult. Therefore, those skilled in the art have provided an acid recycling device for nitrobenzene production to address the problems mentioned in the background section. Utility Model Content

[0004] The purpose of this invention is to provide an acid recycling device in the production of nitrobenzene, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An acid recycling device in nitrobenzene production includes an evaporator, a liquid inlet pipe, a condenser pipe, and a collection tank. The liquid inlet pipe is located at the upper side of the evaporator, the condenser pipe is located at the upper side of the evaporator, and the collection tank is located at the lower end of the condenser pipe. An evaporation component is installed at the upper end of the evaporator, and a liquid outlet strip is provided at the upper side of the evaporation component. A circulation pipe is provided at the lower end of the circulation pipe, and a filter component is installed at the lower side of the evaporator. An inlet pipe is provided at the lower side of the evaporator. The evaporation component includes a heat exchange box, a heat exchange tube is provided inside the heat exchange box, a heating component is installed at the outer end of the heat exchange tube, a heat-conducting plate is provided on the outer side of the heat exchange tube, a fixing plate is provided on one side of the heat exchange box, and a control box is installed on one side of the heating component.

[0007] As a further embodiment of this utility model: the filter component includes an impurity collection box, a filter tube is provided at the upper end of one side of the impurity collection box, a liquid extraction pipe is provided at one side of the filter tube, a liquid pump is installed at one end of the liquid extraction pipe, a filter plate is installed inside the filter tube, a slag removal box is provided at the lower end of the impurity collection box, the heating component includes a heating box, a fan is installed at the rear end of the heating box, a heating ring is installed at the front end of the heating box, and a temperature sensor is installed inside the heating box near the heating ring.

[0008] As a further embodiment of this utility model: the output end of the liquid adding pipe is connected to the upper end of the evaporator, the lower end of the evaporator is connected to the input end of the liquid inlet pipe, the output end of the liquid inlet pipe is connected to the input end of the filter component, the output end of the filter component is connected to the input end of the circulation pipe, the output end of the circulation pipe is connected to the input end of the liquid outlet strip, the output end of the liquid outlet strip is connected to the interior of the evaporator, the upper end of the evaporator is connected to the input end of the condenser, and the output end of the condenser is connected to the upper end of the collection tank.

[0009] As a further embodiment of this utility model: the output end of the heating element is connected to the input end of the heat exchange tube, the output end of the heat exchange tube is connected to the input end of the heating element, the heat exchange box slides inside the evaporator, the fixing plate is located outside the evaporator, the heat exchange box is fixed inside the evaporator by the fixing plate, and the output end of the control box is electrically connected to the input ends of the filter element and the heating element respectively.

[0010] As a further embodiment of this utility model: the output end of the liquid inlet pipe is connected to the input end of the impurity collection box, the output end of the impurity collection box is connected to the input end of the filter pipe, the output end of the filter pipe is connected to the input end of the liquid extraction pipe, the output end of the liquid extraction pipe is connected to the input end of the liquid pump, the output end of the liquid pump is connected to the input end of the circulation pipe, and the sludge removal box slides inside the impurity collection box.

[0011] As a further improvement of this utility model: the front end of the heating box is connected to the input end of the heat exchange tube, and the output end of the heat exchange tube is connected to the input end of the heating box.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The acid recycling device in the production of nitrobenzene of this invention uses an evaporation component to heat and evaporate the acid at a constant temperature, avoiding excessively high local temperatures in the acid, which would cause components other than acid to evaporate along with it, thus improving the acid separation effect and facilitating the subsequent recycling of the acid.

[0014] 2. The filter element circulates and filters the acid solution, and collects impurities in the acid solution, which is beneficial for cleaning the impurities in the acid solution. Attached Figure Description

[0015] Figure 1 A schematic diagram of an acid recycling unit in nitrobenzene production;

[0016] Figure 2 A perspective view of an acid recycling unit in nitrobenzene production;

[0017] Figure 3 A perspective view of the evaporation components in an acid recycling unit during nitrobenzene production;

[0018] Figure 4 A perspective view of the filter components in an acid recycling unit during nitrobenzene production;

[0019] Figure 5 A perspective view of the heating components in an acid recycling unit during nitrobenzene production.

[0020] In the diagram: 1. Evaporator; 2. Liquid inlet pipe; 3. Condenser pipe; 4. Collection tank; 5. Evaporation component; 6. Liquid outlet bar; 7. Circulation pipe; 8. Filter component; 9. Liquid inlet pipe; 10. Heat exchange box; 11. Heat exchange tube; 12. Heating component; 13. Heat conduction plate; 14. Fixing plate; 15. Control box; 16. Impurity collection box; 17. Filter tube; 18. Liquid extraction pipe; 19. Liquid pump; 20. Filter plate; 21. Sludge removal box; 22. Heating box; 23. Fan; 24. Heating ring; 25. Temperature sensor. Detailed Implementation

[0021] Please see Figures 1-5In this embodiment of the invention, the acid recycling device in nitrobenzene production includes an evaporator 1, a liquid addition pipe 2, a condenser pipe 3, and a collection tank 4. The liquid addition pipe 2 is located on the upper side of the evaporator 1, the condenser pipe 3 is located on the upper side of the evaporator 1, and the collection tank 4 is located at the lower end of the condenser pipe 3. An evaporation component 5 is installed at the upper end of the interior of the evaporator 1. A liquid outlet strip 6 is provided on the upper side of the evaporation component 5 inside the evaporator 1. A circulation pipe 7 is provided on the upper side of the liquid outlet strip 6. A filter component 8 is installed at the lower end of the circulation pipe 7. A liquid inlet pipe 9 is provided on the lower side of the evaporator 1. The evaporation component 5 includes a heat exchange box 10. A heat exchange tube 11 is provided inside the heat exchange box 10, and a filter component 8 is installed at the outer end of the heat exchange tube 11. A heat-conducting plate 13 is provided on the outside of the heating element 12 and the heat exchange tube 11. A fixing plate 14 is provided on one side of the heat exchange box 10. A control box 15 is installed on one side of the heating element 12. The output end of the liquid inlet pipe 2 is connected to the upper end of the evaporator 1. The lower end of the evaporator 1 is connected to the input end of the liquid inlet pipe 9. The output end of the liquid inlet pipe 9 is connected to the input end of the filter element 8. The output end of the filter element 8 is connected to the input end of the circulation pipe 7. The output end of the circulation pipe 7 is connected to the input end of the liquid outlet bar 6. The output end of the liquid outlet bar 6 is connected to the interior of the evaporator 1. The upper end of the evaporator 1 is connected to the input end of the condenser pipe 3. The output end of the condenser pipe 3 is connected to the upper end of the collection tank 4. The output end of the heating element 12 is connected to the heat exchange tube 11. The input ends of heat pipe 11 are connected, and the output end of heat exchange pipe 11 is connected to the input end of heating element 12. Heat exchange box 10 slides inside the evaporator 1, and fixing plate 14 is located outside the evaporator 1. Heat exchange box 10 is fixed inside the evaporator 1 by fixing plate 14. The output end of control box 15 is electrically connected to the input ends of filter element 8 and heating element 12 respectively. First, the collection tank 4 is rotated to the lower end of condenser 3, and the acid solution from nitrobenzene production is added to the inside of evaporator 1 through liquid addition pipe 2. Then, control box 15 controls heating element 12 to heat the inside. When the temperature reaches 83°C, heating element 12 stops heating. Heating element 12 circulates the internal heat. Inside the heat exchange tube 11, the heat conduction plate 13 displaces the temperature inside the heat exchange tube 11. The heat from the upper side of the heat conduction plate 13 heats and evaporates the acid solution on the upper side of the heat exchange box 10. The liquid pump 19 runs, and the acid solution inside the evaporation box 1 enters the filter component 8 through the liquid inlet pipe 9. The filter component 8 filters the acid solution inside the impurities. After filtration, it is introduced into the liquid outlet bar 6 through the circulation pipe 7. The acid solution inside the liquid outlet bar 6 flows on the upper side of the heat exchange box 10 for circulation heating and evaporation. The evaporated acid follows the steam into the condenser tube 3. The condenser tube 3 liquefies the steam. After liquefaction, it is introduced into the collection tank 4 for collection. Finally, the impurities inside the filter component 8 are removed, the condenser tube 3 is rotated out of the collection tank 4, and the acid solution collected in the collection tank 4 is taken out.

[0022] exist Figure 2 , 3In sections 4 and 5: the filter component 8 includes an impurity collection box 16, a filter tube 17 is provided at the upper end of one side of the impurity collection box 16, a liquid extraction tube 18 is provided at one side of the filter tube 17, a liquid pump 19 is installed at one end of the liquid extraction tube 18, a filter plate 20 is installed inside the filter tube 17, and a slag removal box 21 is provided at the lower end of the impurity collection box 16. The heating component 12 includes a heating box 22, a fan 23 is installed at the rear end of the heating box 22, and a fan 23 is installed at the front end of the heating box 22. The heating box 22 is equipped with a heating ring 24. A temperature sensor 25 is installed inside the heating box 22 near the heating ring 24. The output end of the liquid inlet pipe 9 is connected to the input end of the impurity collection box 16. The output end of the impurity collection box 16 is connected to the input end of the filter pipe 17. The output end of the filter pipe 17 is connected to the input end of the liquid extraction pipe 18. The output end of the liquid extraction pipe 18 is connected to the input end of the liquid pump 19. The output end of the liquid pump 19 is connected to the input end of the circulation pipe 7. The sludge removal box 21 slides on the impurity collection box 16. Inside the heating chamber 22, the front end of the heating box 22 is connected to the input end of the heat exchange tube 11, and the output end of the heat exchange tube 11 is connected to the input end of the heating box 22. The control box 15 controls the heating ring 24 to run and heat the inside of the heating box 22. The temperature sensor 25 detects the temperature inside the heating box 22. When the temperature reaches 83°C, the heating ring 24 stops heating, and the fan 23 runs to circulate the heat inside the heating box 22 to the inside of the heat exchange tube 11. The heat-conducting plate 13 displaces the temperature inside the heat exchange tube 11. The heat from the upper side of 13 heats and evaporates the acid solution on the upper side of the heat exchange box 10. The liquid pump 19 runs, and the acid solution inside the evaporation box 1 enters the impurity collection box 16 through the liquid inlet pipe 9. The filter plate 20 filters the acid solution inside the impurity collection box 16. After filtration, the acid solution is introduced into the liquid outlet bar 6 through the liquid extraction pipe 18, the liquid pump 19 and the circulation pipe 7. The acid solution inside the liquid outlet bar 6 flows on the upper side of the heat exchange box 10 for circulation heating and evaporation. Finally, the slag removal box 21 inside the impurity collection box 16 is removed to clean the filtered impurities.

[0023] The working principle of this utility model is as follows: First, the collecting tank 4 is rotated to the lower end of the condenser tube 3, and the acid solution from the nitrobenzene production is added into the evaporator 1 through the liquid addition pipe 2. Then, the control box 15 controls the heating ring 24 to run and heat the inside of the heating box 22. The temperature sensor 25 detects the temperature inside the heating box 22. When the temperature reaches 83°C, the heating ring 24 stops heating, and the fan 23 runs to circulate the heat inside the heating box 22 to the inside of the heat exchange tube 11. The heat conduction plate 13 displaces the temperature inside the heat exchange tube 11, and the heat on the upper side of the heat conduction plate 13 heats and evaporates the acid solution on the upper side of the heat exchange box 10. The liquid pump 19 operates... Okay, the acid inside the evaporator 1 enters the impurity collection box 16 through the inlet pipe 9. The filter plate 20 filters the acid inside the impurity collection box 16. After filtration, the acid is introduced into the outlet strip 6 through the suction pipe 18, the liquid pump 19 and the circulation pipe 7. The acid inside the outlet strip 6 flows on the upper side of the heat exchange box 10 for circulation heating and evaporation. The evaporated acid enters the condenser tube 3 with the steam. The condenser tube 3 liquefies the steam. After liquefaction, the acid is introduced into the collection tank 4 for collection. Finally, the slag removal box 21 inside the impurity collection box 16 is removed to clean the filtered impurities. The condenser tube 3 is rotated out of the collection tank 4, and the acid collected in the collection tank 4 is taken out.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An acid recycling device for nitrobenzene production, comprising an evaporator (1), a liquid addition pipe (2), a condenser (3), and a collection tank (4), wherein the liquid addition pipe (2) is located on the upper side of the evaporator (1), the condenser (3) is located on the upper side of the evaporator (1), and the collection tank (4) is located at the lower end of the condenser (3), characterized in that, An evaporation component (5) is installed at the upper part of the interior of the evaporator (1). An outlet strip (6) is provided on the upper side of the evaporation component (5) inside the evaporator (1). A circulation pipe (7) is provided on the upper side of the outlet strip (6). A filter component (8) is installed at the lower end of the circulation pipe (7). An inlet pipe (9) is provided on the lower side of the evaporator (1). The evaporation component (5) includes a heat exchange box (10). A heat exchange tube (11) is provided inside the heat exchange box (10). A heating component (12) is installed on the outer end of the heat exchange tube (11). A heat-conducting plate (13) is provided on the outer side of the heat exchange tube (11). A fixing plate (14) is provided on one side of the heat exchange box (10). A control box (15) is installed on one side of the heating component (12).

2. The acid recycling device in nitrobenzene production according to claim 1, characterized in that, The filter component (8) includes an impurity collection box (16), a filter tube (17) is provided at the upper end of one side of the impurity collection box (16), a liquid extraction tube (18) is provided at one side of the filter tube (17), a liquid pump (19) is installed at one end of the liquid extraction tube (18), a filter plate (20) is installed inside the filter tube (17), a slag removal box (21) is provided at the lower end of the impurity collection box (16), the heating component (12) includes a heating box (22), a fan (23) is installed at the rear end of the heating box (22), a heating ring (24) is installed at the front end of the heating box (22), and a temperature sensor (25) is installed inside the heating box (22) near the heating ring (24).

3. The acid recycling device in nitrobenzene production according to claim 1, characterized in that, The output end of the liquid adding pipe (2) is connected to the upper end of the evaporator (1), the lower end of the evaporator (1) is connected to the input end of the liquid inlet pipe (9), the output end of the liquid inlet pipe (9) is connected to the input end of the filter component (8), the output end of the filter component (8) is connected to the input end of the circulation pipe (7), the output end of the circulation pipe (7) is connected to the input end of the liquid outlet strip (6), the output end of the liquid outlet strip (6) is connected to the interior of the evaporator (1), the upper end of the evaporator (1) is connected to the input end of the condenser pipe (3), and the output end of the condenser pipe (3) is connected to the upper end of the collection tank (4).

4. The acid recycling device in nitrobenzene production according to claim 1, characterized in that, The output end of the heating element (12) is connected to the input end of the heat exchange tube (11), the output end of the heat exchange tube (11) is connected to the input end of the heating element (12), the heat exchange box (10) slides inside the evaporator (1), the fixing plate (14) is located outside the evaporator (1), the heat exchange box (10) is fixed inside the evaporator (1) by the fixing plate (14), and the output end of the control box (15) is electrically connected to the input ends of the filter element (8) and the heating element (12).

5. The acid recycling device in nitrobenzene production according to claim 2, characterized in that, The output end of the inlet pipe (9) is connected to the input end of the impurity collection box (16), the output end of the impurity collection box (16) is connected to the input end of the filter pipe (17), the output end of the filter pipe (17) is connected to the input end of the suction pipe (18), the output end of the suction pipe (18) is connected to the input end of the liquid pump (19), the output end of the liquid pump (19) is connected to the input end of the circulation pipe (7), and the sludge removal box (21) slides inside the impurity collection box (16).

6. The acid recycling device in nitrobenzene production according to claim 2, characterized in that, The front end of the heating box (22) is connected to the input end of the heat exchange tube (11), and the output end of the heat exchange tube (11) is connected to the input end of the heating box (22).

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