Bromination apparatus

Abstract

The utility model discloses a bromination reaction device belongs to bromination reaction device technical field, including main reation kettle, hydrogen peroxide measuring tank, main circulating pump, vice circulating pump, atomizing nozzle venturi booster pipe and hydrobromic acid storage tank, and hydrogen peroxide measuring tank and hydrobromic acid storage tank are connected with main reation kettle respectively, and main reation kettle is connected main circulating pump and vice circulating pump through pipeline respectively, and the output of main circulating pump and vice circulating pump is connected two atomizing nozzles through pipeline respectively, and two atomizing nozzles are all set in main reation kettle inside upper side, and the pipeline between vice circulating pump and atomizing nozzle is venturi booster pipe, and main circulating pump can pump out reaction liquid from main reation kettle bottom and re -spray reaction liquid from main reation kettle upper side into main reation kettle in main reation kettle through atomizing nozzle, and atomized reaction liquid can fully absorb bromine free radical, and make the reaction more fully.

Description

Technical Field

[0001] This utility model belongs to the technical field of bromination reaction apparatus, and more specifically, relates to a bromination reaction apparatus. Background Technology

[0002] In the traditional bromination process of o-chloro-p-nitroaniline, the bromine free radicals generated by the reaction of hydrogen peroxide and hydrobromic acid can escape. The escaped bromine forms a brownish-red waste gas that is toxic and corrosive, requiring additional treatment, polluting the environment and increasing the cost of tail gas treatment. The low utilization rate of bromine free radicals leads to an increase in the consumption of hydrobromic acid. Existing technologies mostly use tail gas absorption towers to treat bromine vapor, but they cannot achieve the recovery and reuse of raw materials. Therefore, a bromination reaction device that reduces waste gas emissions and lowers raw material consumption is needed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a bromination reaction device that can meet the requirements of reducing waste gas emissions and reducing raw material consumption in the bromination reaction device.

[0004] This utility model discloses a bromination reaction apparatus, comprising a main reaction vessel, a hydrogen peroxide metering tank, a main circulation pump, a secondary circulation pump, atomizing nozzles, a Venturi booster pipe, and a hydrobromic acid storage tank. The hydrogen peroxide metering tank and the hydrobromic acid storage tank are respectively connected to the main reaction vessel. The main reaction vessel is connected to the main circulation pump and the secondary circulation pump through pipelines, and the output ends of the main circulation pump and the secondary circulation pump are respectively connected to two atomizing nozzles through pipelines. Both atomizing nozzles are located inside and above the main reaction vessel. The pipeline between the secondary circulation pump and the atomizing nozzles is a Venturi booster pipe. The main circulation pump can pump the reaction liquid from the bottom of the main reaction vessel and spray the reaction liquid back into the main reaction vessel from above through the atomizing nozzles. After atomization, the reaction liquid can fully absorb bromine free radicals, making the reaction more complete.

[0005] As a further improvement of this utility model, a stirrer is installed inside the main reaction vessel. The stirrer adopts a multi-layer blade design to ensure uniform mixing of the reaction liquid.

[0006] As a further improvement of this utility model, a filter is installed in the pipe connecting the main circulation pump to the atomizing nozzle.

[0007] As a further improvement of this utility model, a dripping head is installed at the output end of the hydrogen peroxide metering tank. The bottom of the dripping head is designed with a porous structure. The hydrogen peroxide metering tank is connected to each hole of the dripping head through multiple distribution pipes to achieve uniform distribution of hydrogen peroxide.

[0008] As a further improvement of this utility model, the Venturi booster tube is provided with a detachable throat section, and different sizes of throats can be replaced according to different reaction requirements.

[0009] As a further improvement of this utility model, the pipe section on the atomizing nozzle is set as a telescopic pipe, and a knob is provided on the side of the telescopic pipe to control the degree of pipe extension and contraction. The nozzle head of the atomizing nozzle can rotate to adjust the spray angle, so that the atomizing nozzle can be radially adjusted inside the main reactor and rotated to change the spray direction to adapt to different reaction states.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: the main circulation realizes the forced circulation and atomization of the reaction liquid, the secondary circulation actively recovers the escaped bromine through the Venturi effect, the consumption of hydrobromic acid raw materials is reduced through the dual circulation, and the emission of bromine waste gas is reduced. The porous drip head ensures uniform distribution of hydrogen peroxide; the multi-layered stirring paddle ensures thorough mixing of the reaction system; filters are installed in the pipeline to remove solid impurities and prevent nozzle clogging; the Churi booster pipe has a detachable throat section, which can be replaced with different sizes of throats according to different reaction requirements; the atomizing nozzle can be radially adjusted inside the main reactor and rotated to change the spray direction to adapt to different reaction states. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 For the present utility model Figure 1 Enlarged view of region A and schematic diagram of the filter structure; Figure 3 For the present utility model Figure 1 Enlarged view of region B in the middle; Figure 4 This is a schematic diagram of the atomizing nozzle structure of this utility model.

[0012] Explanation of the labels in the diagram: Main reactor 1; stirrer 11; hydrogen peroxide metering tank 2; dripping head 21; main circulation pump 3; auxiliary circulation pump 4; atomizing nozzle 5; venturi booster pipe 6; hydrobromic acid storage tank 7; filter 8. Detailed Implementation

[0013] Specific Implementation Example 1: Please refer to Figures 1-4This utility model relates to a bromination reaction apparatus, including a main reaction vessel 1, a hydrogen peroxide metering tank 2, a main circulation pump 3, a secondary circulation pump 4, and a hydrobromic acid storage tank 7. The hydrogen peroxide metering tank 2 is connected to the top of the main reaction vessel 1 to ensure accurate dripping of hydrogen peroxide into the main reaction vessel 1. The hydrobromic acid storage tank 7 is connected to the side wall of the main reaction vessel 1, allowing hydrobromic acid to be directly mixed into the reaction solution during replenishment, reducing the volatilization of hydrobromic acid and the escape of bromide ions. The main circulation pump 3 is connected to the bottom of the main reaction vessel 1, and the output end of the main circulation pump 3 is connected to an atomizing nozzle 5 through a pipe. The main circulation pump 3 can draw hydrogen peroxide from the main reaction vessel 1... The reaction liquid is pumped out from the bottom and sprayed back into the main reactor 1 from above through the atomizing nozzle 5. After atomization, the reaction liquid can fully absorb bromine free radicals, making the reaction more complete. The input end of the secondary circulation pump 4 is connected to the lower side wall of the main reactor 1, and the output end is connected to the Venturi booster pipe 6. The tail end of the Venturi booster pipe 6 is connected to the atomizing nozzle 5. The atomizing nozzle 5 is set inside the main reactor 1 from the top. The negative pressure generated in the Venturi booster pipe 6 can draw in the escaped bromine ions and redisperse them in the reaction liquid in the main reactor 1, thereby reducing the consumption of hydrobromic acid.

[0014] In a further embodiment, such as Figure 1 As shown, a stirrer 11 is installed inside the main reactor 1. The stirrer 11 adopts a multi-layer blade design to ensure uniform mixing of the reaction liquid.

[0015] In a further embodiment, such as Figure 2 As shown, a filter 8 is installed in the pipe connecting the main circulation pump 3 to the atomizing nozzle 5 to remove solid impurities and prevent the nozzle from clogging.

[0016] In a further embodiment, such as Figure 3 As shown, a dripping head 21 is installed at the output end of the hydrogen peroxide metering tank 2. The bottom of the dripping head 21 is designed with a porous structure. The hydrogen peroxide metering tank 2 is connected to each hole of the dripping head 21 through multiple distribution pipes to achieve uniform distribution of hydrogen peroxide.

[0017] In a further embodiment, such as Figure 1 As shown, the Venturi booster tube 6 is equipped with a detachable throat section, which can be replaced with different sizes of throats according to different reaction requirements.

[0018] In a further embodiment, such as Figure 3 As shown, the pipe section on the atomizing nozzle 5 is a telescopic pipe. The side of the telescopic pipe is equipped with a knob that can control the degree of pipe extension and contraction. The nozzle of the atomizing nozzle 5 can rotate to adjust the spray angle, so that the atomizing nozzle 5 can be radially adjusted inside the main reactor 1 and rotated to change the spray direction to adapt to different reaction states.

[0019] In a further embodiment, such as Figure 4As shown, the impellers of the stirrer 11 are arranged asymmetrically. The upper impellers have different lengths to disturb the reaction liquid and promote longitudinal mixing, while the lower impellers are tilted downwards to prevent bottom deposition and form a mixed flow field, making the reaction more complete.

[0020] In use, o-chloro-p-nitroaniline, water, and hydrobromic acid are added to the main reactor 1 in proportion; hydrogen peroxide is added evenly to the main reactor 1 through the dropper 21 to form a reaction system; the stirrer 11 is started to fully stir the reaction liquid; the main circulation pump 3 draws the reaction liquid from the bottom of the reactor and sprays it back into the reaction system through the atomizing nozzle 5; the auxiliary circulation pump 4 captures the escaped bromine through the negative pressure generated by the Venturi booster pipe 6 and reintroduces it into the reaction system through the atomizing nozzle 5; as the reaction proceeds, hydrobromic acid is added to the main reactor 1 from the hydrobromic acid storage tank 7 until the reaction is complete.

Claims

1. A bromination reaction apparatus characterized by comprising: The reactor includes a main reactor (1), a hydrogen peroxide metering tank (2), a main circulation pump (3), a secondary circulation pump (4), an atomizing nozzle (5), a venturi booster pipe (6), and a hydrobromic acid storage tank (7). The hydrogen peroxide metering tank (2) and the hydrobromic acid storage tank (7) are connected to the main reactor (1). The main reactor (1) is connected to the main circulation pump (3) and the secondary circulation pump (4) through pipes. The output ends of the main circulation pump (3) and the secondary circulation pump (4) are connected to two atomizing nozzles (5) through pipes. The two atomizing nozzles (5) are located inside the main reactor (1) and above. The pipe between the secondary circulation pump (4) and the atomizing nozzle (5) is a venturi booster pipe (6).

2. A bromination reaction apparatus according to claim 1, wherein: The main reactor (1) is equipped with a stirrer (11), which adopts a multi-layer blade design.

3. The bromination reaction apparatus of claim 1, wherein: A filter (8) is installed in the pipe connecting the main circulation pump (3) to the atomizing nozzle (5).

4. The bromination reaction apparatus of claim 1, wherein: The hydrogen peroxide metering tank (2) is equipped with a dripping head (21) at the output end. The bottom of the dripping head (21) is designed with a porous structure. The hydrogen peroxide metering tank (2) is connected to each hole of the dripping head (21) through multiple distribution pipes.

5. The bromination reaction apparatus of claim 1, wherein: The Venturi booster tube (6) is equipped with a detachable throat section, and different sizes of throats can be replaced according to different reaction requirements.

6. The bromination reaction apparatus of claim 1, wherein: The atomizing nozzle (5) is equipped with a telescopic pipe (51) and a nozzle (52) that can rotate the spray angle.

7. A bromination reaction apparatus according to claim 2, wherein: The blades of the agitator (11) are arranged asymmetrically.

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