Continuous bromination reaction system

Abstract

The utility model discloses a continuous bromination reaction system which comprises a feeding assembly, a reaction assembly and a tail gas absorption assembly, the reaction assembly is connected with the feeding assembly through a pipeline, the tail gas absorption assembly is connected with the reaction assembly through a pipeline, and the reaction assembly is formed by connecting a plurality of reaction kettles in series through pipelines. According to the continuous bromination reaction system provided by the utility model, a plurality of reaction kettles are connected in series to carry out continuous bromination reaction to obtain brominated liquid, meanwhile, generated hydrogen bromide gas is absorbed from the gas absorption assembly, the whole system works in a closed manner, operators cannot be in contact with toxic raw materials such as liquid bromine, hydrogen bromide and the like, and the continuous bromination reaction system is high in production efficiency, safe and environment-friendly.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment, specifically relates to a continuous bromination reaction system. BACKGROUND

[0002] Bromination reaction is the reaction that hydrogen in the molecule of organic compound is replaced by bromine to generate bromine-containing compound, which is common and widely used in the field of fine chemical industry such as medicine, pesticide and surfactant.

[0003] In the related art, the traditional kettle type reactor is often used for intermittent operation, not only the yield is small, but also the product quality is prone to fluctuation, meanwhile, liquid bromine itself has the characteristics of great toxicity, easy volatilization and strong corrosion, and the generated hydrogen bromide is a gas with strong acidity and strong corrosion, so the kettle type reactor in the related art is difficult to carry out efficient, continuous and safe bromination reaction. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a continuous bromination reaction system to solve the problem that efficient, continuous and safe bromination reaction is difficult to carry out in the prior art.

[0005] Therefore, the utility model provides a continuous bromination reaction system, which comprises a feeding assembly, a reaction assembly and a tail gas absorption assembly, the reaction assembly is connected with the feeding assembly through a pipeline, the tail gas absorption assembly is connected with the reaction assembly through a pipeline, and the reaction assembly is connected with a plurality of reaction kettles through a pipeline in series.

[0006] Preferably, the reaction kettle is provided with an overflow port, a feeding port and a discharging port at the upper portion, the feeding port of the first reaction kettle is connected with the feeding assembly through a pipeline, the feeding port of each reaction kettle after the first reaction kettle is connected with the discharging port of the previous reaction kettle through a pipeline, and the overflow port of the reaction kettle is connected with the tail gas absorption assembly through a pipeline.

[0007] Preferably, a condenser is arranged at the overflow port.

[0008] Preferably, the feeding assembly comprises a raw material high tank and a liquid bromine high tank, and the raw material high tank and the liquid bromine high tank are connected with the reaction assembly through a pipeline.

[0009] Preferably, a first shut-off valve and a first flow regulating valve are arranged below the raw material high tank.

[0010] Preferably, a second shut-off valve and a second flow regulating valve are arranged below the liquid bromine high tank.

[0011] Preferably, the tail gas absorption assembly comprises a first absorption tower, a second absorption tower and a third absorption tower connected in series through pipelines.

[0012] Preferably, the first absorption tower and the second absorption tower are water absorption towers.

[0013] Preferably, the third absorption tower is an alkali absorption tower.

[0014] Preferably, the reaction kettle is provided with a stirrer and a heating and cooling system.

[0015] Beneficial effects:

[0016] 1. The utility model provides a continuous bromination reaction system, passes through a plurality of reaction kettle series connection carries out continuous bromination reaction, obtains bromination liquid, simultaneously absorbs the bromine hydrogen gas generated from the gas absorption assembly, whole system closed operation, and the operator will not contact liquid bromine, bromine hydrogen and the like poisonous raw material, production efficiency is high, safety environmental protection.

[0017] 2. The gas absorption assembly in the utility model recycles tail gas through three series connection absorption towers, the water absorption tower produces byproduct hydrobromic acid while absorbing bromine hydrogen tail gas, and the alkali absorption tower ensures complete removal of residual bromine hydrogen, ensuring the safety and environmental protection of the system. DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0019] Figure 1 The utility model provides a kind of continuous bromination reaction system's piping schematic view.

[0020] In the drawing, 1-reaction kettle, 11-overflow port, 12-feeding port, 13-discharge port, 14-condenser, 2-raw material high tank, 21-first cut-off valve, 22-first flow regulating valve, 3-liquid bromine high tank, 31-second cut-off valve, 32-second flow regulating valve, 4-first absorption tower, 5-second absorption tower, 6-third absorption tower. DETAILED DESCRIPTION

[0021] The content of the present application can be more easily understood by referring to the following detailed description of the preferred embodiments of the present application and included drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of conflict, the definition in the specification prevails.

[0022] Embodiment 1

[0023] Provided is a continuous bromination reaction system as shown in Figure 1 The continuous bromination reaction system comprises a feeding assembly, a reaction assembly and a tail gas absorption assembly. The reaction assembly is connected to the feeding assembly through a pipeline, and the tail gas absorption assembly is connected to the reaction assembly through a pipeline. The reaction assembly is connected to three reaction kettles through a pipeline in series.

[0024] An overflow port 11, a feeding port 12 and a discharging port 13 are arranged above the reaction kettle 1. The feeding port 12 of the first reaction kettle 1 is connected to the feeding assembly through a pipeline. The feeding port 12 of each reaction kettle 1 after the first reaction kettle 1 is connected to the discharging port 13 of the previous reaction kettle 1 through a pipeline. The overflow port 11 of the reaction kettle 1 is connected to the tail gas absorption assembly through a pipeline. A condenser 14 is arranged at the overflow port 11. A stirrer and a heating and cooling system are arranged in the reaction kettle 1. The stirrer is driven by a motor to rotate a stirring rod to stir in the reaction kettle 1. The heating and cooling system heats or cools the reaction kettle 1 through a jacket.

[0025] The feeding assembly comprises a raw material high tank 2 and a liquid bromine high tank 3. The raw material high tank 2 and the liquid bromine high tank 3 are connected to the reaction assembly through a pipeline. The raw material high tank 2 is used to feed reaction raw materials, and the liquid bromine high tank 3 is used to feed liquid bromine. A first shut-off valve 21 and a first flow regulating valve 22 are arranged below the raw material high tank 2. A second shut-off valve 31 and a second flow regulating valve 32 are arranged below the liquid bromine high tank 3.

[0026] The tail gas absorption assembly comprises a first absorption tower 4, a second absorption tower 5 and a third absorption tower 6 connected in series through a pipeline. The first absorption tower 4 and the second absorption tower 5 are water absorption towers. The water absorption towers produce by-product hydrobromic acid while absorbing hydrogen bromide tail gas. The third absorption tower 6 is an alkali absorption tower. The alkali absorption tower completely removes residual hydrogen bromide in the tail gas to ensure safety and environmental protection. The alkali in the alkali absorption tower is sodium hydroxide.

[0027] Working principle: open the first cut-off valve 21 and the second cut-off valve 31, raw material high tank 2 and liquid bromine high tank 3 begin to feed into the reactor 1, the first flow regulating valve 22 and the second flow regulating valve 32 adjust the amount of raw material and liquid bromine. Raw material and liquid bromine into the first reactor 1, after stirring and heating into the second reactor 1 and the third reactor 1 in turn, from the discharge port 13 of the third reactor 1 get bromination liquid. Each reactor 1 will produce hydrobromic acid gas entrainment part of bromine from the overflow port 11, after the condenser 14 bromine reflux to the reactor 1 continue to participate in the reaction, bromine hydrogen acid gas and other tail gas into the tail gas absorption assembly, first into the first absorption tower 4 and the second absorption tower 5 in the absorption of hydrogen bromide tail gas at the same time produce by-product hydrobromic acid, then into the third absorption tower 6 will be completely clear of hydrogen bromide tail gas.

Claims

1. A continuous bromination reaction system characterized by, The utility model relates to a kind of production device for preparing bromine-containing compound, including: Feeding assembly, reaction assembly and tail gas absorption assembly, the reaction assembly is connected with the feeding assembly by pipeline, the tail gas absorption assembly is connected with the reaction assembly by pipeline, the reaction assembly is connected by pipeline in series with several reaction kettles; The overflow port, feed inlet and discharge outlet are arranged above the reaction kettle, among multiple series-connected reaction kettles, the feed inlet of first reaction kettle is connected with the feeding assembly by pipeline, the feed inlet of each reaction kettle after is connected with the discharge outlet of previous reaction kettle by pipeline, the overflow port on the reaction kettle is connected with the tail gas absorption assembly by pipeline; Condenser is arranged at the overflow port.

2. The continuous bromination reaction system according to claim 1, wherein The feeding assembly includes raw material high tank and liquid bromine high tank, and the raw material high tank and the liquid bromine high tank are connected with the reaction assembly by pipeline.

3. A continuous bromination reaction system according to claim 2, wherein First shut-off valve and first flow regulating valve are arranged below the raw material high tank.

4. The continuous bromination reaction system according to claim 2, wherein Second shut-off valve and second flow regulating valve are arranged below the liquid bromine high tank.

5. The continuous bromination reaction system according to claim 1, wherein The tail gas absorption assembly includes first-stage absorption tower, second-stage absorption tower and third-stage absorption tower connected by pipeline in series.

6. A continuous bromination reaction system according to claim 5, wherein The first-stage absorption tower and the second-stage absorption tower are water absorption towers.

7. The continuous bromination reaction system according to claim 5, wherein The third-stage absorption tower is an alkali absorption tower.

8. The continuous bromination reaction system according to claim 6, wherein Stirrer and heating and cooling system are arranged in the reaction kettle.

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