Bromination reaction system for preparing brominated pyrrole nitrile

Abstract

The bromination reaction system comprises a bromination reaction kettle, a bromine dropwise adding tank and a hydrogen peroxide dropwise adding tank, a reaction cavity is formed in the bottom of an inner cavity of the bromination reaction kettle, and the bottoms of the bromine dropwise adding tank and the hydrogen peroxide dropwise adding tank are communicated with the reaction cavity through pipelines; a plurality of condensation chambers are longitudinally formed in the top of an inner cavity of the bromination reaction kettle, communicating pipes are arranged in the centers of the condensation chambers in a penetrating mode, the bottom ends of the communicating pipes are connected with a flow guide conical shell, the flow guide conical shell is fixedly connected to the inner wall of the bromination reaction kettle, and the top ends of the communicating pipes are arranged close to the kettle top of the bromination reaction kettle; a liquid collection chamber is arranged between the flow guide conical shell and the lowest condensation chamber, and a backflow bent pipe is mounted at the bottom of the liquid collection chamber. According to the utility model, hydrogen bromide gas escaped in the dropwise adding process can be effectively condensed and recovered, the bromination reaction and condensation recovery functions are integrated, the length of a production line is shortened, the production cost is reduced, and the space layout of a site is facilitated.

Description

Technical Field

[0001] The utility model relates to a bromination reaction system for preparing bromopyrrole nitrile, and belongs to the technical field of preparing bromopyrrole nitrile. Background Art

[0002] Bromopyrrolecarbonitrile, also known as trolopride, is a white crystalline solid at room temperature and pressure. It is soluble in water but insoluble in most organic solvents and has a weak alkalinity. Bromopyrrolecarbonitrile is mainly used in the agricultural field. As an effective herbicide, it performs well in controlling leafy weeds such as grass weeds, especially leafy weeds such as grass weeds.

[0003] At present, a bromination reaction system is required in the preparation process of bromopyrrole carbonitrile. The bromination reaction system includes a bromination reaction kettle, various dropping tanks, and multiple condensers arranged in series. The hydrogen bromide gas escaped during the dropping process is condensed and recovered through the multiple condensers arranged in series.

[0004] In the prior art, multiple condensers are connected in series outside the bromination reactor to realize condensation and recovery of hydrogen bromide gas. The production line is relatively long and complicated, the production cost is high, and there is a problem that it is not conducive to the spatial layout of the site. Utility Model Content

[0005] The utility model aims at the deficiencies in the background technology and provides a bromination reaction system for preparing bromopyrrole carbonitrile, which can effectively condense and recover hydrogen bromide gas escaped during the dropping process, integrates the bromination reaction with the condensation recovery function, shortens the length of the production line, reduces the production cost, and is beneficial to the site space layout.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A bromination reaction system for preparing bromopyrrole carbonitrile comprises a bromination reaction kettle, a bromine dropping tank and a hydrogen peroxide dropping tank, wherein a reaction chamber is arranged at the bottom of the inner cavity of the bromination reaction kettle, and the bottoms of the bromine dropping tank and the hydrogen peroxide dropping tank are both connected to the reaction chamber through pipelines;

[0008] The top of the inner cavity of the bromination reaction kettle is longitudinally provided with a plurality of condensation chambers, the center of the condensation chamber is provided with a connecting pipe penetrating therethrough, the bottom end of the connecting pipe is connected to a guide cone shell, the guide cone shell is fixed to the inner wall of the bromination reaction kettle, and the top end of the connecting pipe is arranged close to the top of the bromination reaction kettle;

[0009] A liquid collecting chamber is arranged between the guide cone shell and the lowest condensing chamber, and a reflux elbow is installed at the bottom of the liquid collecting chamber.

[0010] Furthermore, a feed port is provided on one side of the top of the reaction chamber, and a discharge port is provided on one side of the bottom of the reaction chamber.

[0011] Furthermore, a stirring mechanism is installed at the bottom of the reaction chamber, and the stirring mechanism is driven by a motor at the bottom of the bromination reaction kettle.

[0012] Furthermore, a jacket is provided outside the reaction chamber, a circulating water inlet is provided on one side of the bottom of the jacket, and a circulating water outlet is provided on one side of the top of the jacket.

[0013] Furthermore, orifice plates are provided at both upper and lower ends of the condensation chamber, and the orifice plates are fixed to the inner wall of the bromination reaction kettle.

[0014] Furthermore, a cooling water inlet is provided on one side of the bottom of the condensation chamber, and a cooling water outlet is provided on one side of the top of the condensation chamber.

[0015] Furthermore, there are multiple condensing tubes evenly distributed between the connecting tube and the inner wall of the bromination reaction kettle.

[0016] Furthermore, the condenser tube is vertically arranged and fixed in the orifice plate.

[0017] Furthermore, the top end of the condenser tube is arranged flush with the upper surface of the uppermost orifice plate.

[0018] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0019] The hydrogen bromide escaped during the dropping process enters the top of the kettle along the connecting pipe under the action of the guide cone shell, and then enters the condenser from top to bottom. Since the condenser is arranged in multiple condensation chambers, the hydrogen bromide realizes multi-stage condensation during the longitudinal flow along the condenser, enters the liquid collecting chamber after condensation, and finally flows back to the reaction chamber through the reflux elbow. The utility model integrates the bromination reaction and the condensation recovery function, does not need to be externally connected with multiple condensers in series, can shorten the length of the production line, reduce the production cost, and is conducive to the site space layout.

[0020] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0023] Figure 3 It is a schematic diagram of the top structure of the bromination reactor.

[0024] In the figure, 1-bromination reaction kettle, 2-bromine dropping tank, 3-hydrogen peroxide dropping tank, 4-jacket, 5-circulating water inlet, 6-circulating water outlet, 7-reaction chamber, 8-guiding cone shell, 9-condensation chamber, 10-connecting pipe, 11-orifice plate, 12-cooling water inlet, 13-cooling water outlet, 14-liquid collecting chamber, 15-reflux elbow, 16-feeding port, 17-stirring mechanism, 18-discharging port, 19-condensing pipe. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0026] like Figure 1-Figure 3 As shown together, the utility model provides a bromination reaction system for preparing bromopyrrole carbonitrile, comprising a bromination reaction kettle 1, a bromine dropping tank 2 and a hydrogen peroxide dropping tank 3. A reaction chamber 7 is provided at the bottom of the inner cavity of the bromination reaction kettle 1, and the bottoms of the bromine dropping tank 2 and the hydrogen peroxide dropping tank 3 are both connected to the reaction chamber 7 through pipelines.

[0027] A feed port 16 is provided on one side of the top of the reaction chamber 7 , and a discharge port 18 is provided on one side of the bottom of the reaction chamber 7 .

[0028] A stirring mechanism 17 is installed at the bottom of the reaction chamber 7 , and the stirring mechanism 17 is driven by a motor at the bottom of the bromination reaction kettle 1 .

[0029] A jacket 4 is provided outside the reaction chamber 7 , a circulating water inlet 5 is provided on one side of the bottom of the jacket 4 , and a circulating water outlet 6 is provided on one side of the top of the jacket 4 . The circulating water flows in the jacket 4 to control the temperature of the material in the reaction chamber 7 .

[0030] The top of the inner cavity of the bromination reaction kettle 1 is longitudinally provided with a plurality of condensation chambers 9, and a connecting pipe 10 is provided through the center of the condensation chamber 9, the bottom end of the connecting pipe 10 is connected to the guide cone shell 8, the guide cone shell 8 is fixedly connected to the inner wall of the bromination reaction kettle 1, and the top end of the connecting pipe 10 is provided close to the top of the bromination reaction kettle 1.

[0031] The upper and lower ends of the condensation chamber 9 are provided with orifice plates 11, which are fixed to the inner wall of the bromination reaction kettle 1. A cooling water inlet 12 is provided on one side of the bottom of the condensation chamber 9, and a cooling water outlet 13 is provided on one side of the top of the condensation chamber 9.

[0032] There are multiple condensing tubes 19 evenly distributed between the connecting tube 10 and the inner wall of the bromination reactor 1 . The condensing tubes 19 are vertically penetrated and fixed in the orifice plate 11 . The top of the condensing tubes 19 is flush with the upper surface of the uppermost orifice plate 11 .

[0033] A liquid collecting chamber 14 is provided between the guide cone shell 8 and the lowest condensation chamber 9, and a reflux elbow 15 is installed at the bottom of the liquid collecting chamber 14. The reflux elbow 15 can reflux the liquid in the liquid collecting chamber 14 into the reaction chamber 7 and prevent the gas in the reaction chamber 7 from entering the liquid collecting chamber 14.

[0034] The specific working principle of this utility model:

[0035] The material is introduced into the reaction chamber 7 from the feed port 16, the hydrogen peroxide in the hydrogen peroxide dripping tank 3 is dripped into the reaction chamber 7, and the bromine in the bromine dripping tank 2 is dripped into the reaction chamber 7. During the dripping process, a small amount of hydrogen bromide escapes, and under the action of the guide cone shell 8, the hydrogen bromide enters the top of the bromination reactor 1 along the connecting pipe 10, and then enters the condenser 19 from top to bottom. Since the condenser 19 is arranged in multiple condensation chambers 9, the hydrogen bromide realizes multi-stage condensation during the longitudinal flow along the condenser 19, enters the liquid collecting chamber 14 after condensation, and refluxes into the reaction chamber 7 through the reflux elbow 15. After the reaction is completed, the material in the reactor is transferred to the bromination desolventizing reactor of the next process through the discharge port 18.

[0036] The above is an example of the best implementation of the utility model, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of the utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A bromination reaction system for preparing bromopyrrole carbonitrile, characterized in that: The invention comprises a bromination reaction kettle (1), a bromine dropping tank (2) and a hydrogen peroxide dropping tank (3); a reaction chamber (7) is provided at the bottom of the inner cavity of the bromination reaction kettle (1); and the bottoms of the bromine dropping tank (2) and the hydrogen peroxide dropping tank (3) are both connected to the reaction chamber (7) through pipelines; The top of the inner cavity of the bromination reaction kettle (1) is provided with a plurality of condensation chambers (9) along the longitudinal direction, and a connecting pipe (10) is provided through the center of the condensation chamber (9), the bottom end of the connecting pipe (10) is connected to the guide cone shell (8), the guide cone shell (8) is fixed to the inner wall of the bromination reaction kettle (1), and the top end of the connecting pipe (10) is provided close to the top of the bromination reaction kettle (1); A liquid collecting chamber (14) is provided between the guide cone shell (8) and the lowest condensing chamber (9), and a return elbow (15) is installed at the bottom of the liquid collecting chamber (14).

2. The bromination reaction system for preparing bromopyrrole carbonitrile according to claim 1, characterized in that: A feed port (16) is provided on one side of the top of the reaction chamber (7), and a discharge port (18) is provided on one side of the bottom of the reaction chamber (7).

3. The bromination reaction system for preparing bromopyrrole carbonitrile according to claim 1, characterized in that: A stirring mechanism (17) is installed at the bottom of the reaction chamber (7), and the stirring mechanism (17) is driven by a motor at the bottom of the bromination reaction kettle (1).

4. The bromination reaction system for preparing bromopyrrole carbonitrile according to claim 1, characterized in that: A jacket (4) is provided outside the reaction chamber (7), a circulating water inlet (5) is provided on one side of the bottom of the jacket (4), and a circulating water outlet (6) is provided on one side of the top of the jacket (4).

5. The bromination reaction system for preparing bromopyrrole carbonitrile according to claim 1, characterized in that: The condensation chamber (9) is provided with orifice plates (11) at both upper and lower ends, and the orifice plates (11) are fixedly connected to the inner wall of the bromination reaction kettle (1).

6. The bromination reaction system for preparing bromopyrrolecarbonitrile according to claim 5, characterized in that: A cooling water inlet (12) is provided on one side of the bottom of the condensation chamber (9), and a cooling water outlet (13) is provided on one side of the top of the condensation chamber (9).

7. The bromination reaction system for preparing bromopyrrolecarbonitrile according to claim 1, characterized in that: There are multiple condensing tubes (19) evenly distributed between the connecting pipe (10) and the inner wall of the bromination reaction kettle (1).

8. The bromination reaction system for preparing bromopyrrolecarbonitrile according to claim 7, characterized in that: The condenser tube (19) is vertically arranged and fixed in the orifice plate (11).

9. The bromination reaction system for preparing bromopyrrolecarbonitrile according to claim 8, characterized in that: The top end of the condenser tube (19) is arranged flush with the upper surface of the uppermost orifice plate (11).

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