Automatic dropwise adding system for chloromethyl ethyl ether

Abstract

The utility model discloses an automatic chloromethyl ethyl ether dropwise adding system which comprises a metering tank, a dropwise adding pipe is connected to the bottom of the metering tank, one end, far away from the metering tank, of the dropwise adding pipe is connected with a liquid distribution ring pipe, the liquid distribution ring pipe is fixedly installed on the top of an inner cavity of a condensation reaction kettle, and a plurality of dropwise adding holes distributed circumferentially are formed in the pipe wall of the liquid distribution ring pipe; a feeding valve, a flow meter, an electric control valve, an upper tee joint and a lower tee joint are sequentially mounted on the dripping pipe in the conveying direction, and a first on-off valve is mounted between the upper tee joint and the lower tee joint; a side port of the upper tee joint is connected with an inlet pipe of the heat exchange pipe bundle, and a second on-off valve is mounted at the joint; a side port of the lower tee joint is connected with an outlet pipe of the heat exchange pipe bundle, and a third on-off valve is installed at the joint. According to the utility model, the dripping process can be uniform, the problem that local reaction is too violent is avoided, the dripping temperature can be adjusted, and the dripping temperature is ensured to be controlled within a process requirement range.

Description

Technical Field

[0001] The utility model relates to an automatic dripping system for chloromethyl ether, belonging to the technical field of condensation reaction equipment. Background Art

[0002] Chloromethyl ether, also known as chloromethyl ethyl ether, is a colorless transparent liquid, mainly used in pesticide intermediates, pharmaceutical intermediates, and new material synthesis. Chloromethyl ether needs to be added dropwise through a dripping device during the synthesis of chlorfenapyr.

[0003] Patent No. CN201720952669.X discloses an automatic dripping device, including a reactor and a PLC control system, a first metering tank and a second metering tank are arranged above the reactor, the first metering tank and the second metering tank are connected to the reactor through dripping pipes respectively, weighing devices are installed at the bottom of the first metering tank and the second metering tank, a first tank bottom valve is arranged at the bottom of the first metering tank, a second tank bottom valve is arranged at the bottom of the second metering tank, a first regulating valve is arranged between the first tank bottom valve and the reactor, and a second regulating valve is arranged between the second tank bottom valve and the reactor.

[0004] Patent No. CN201922224552.1 discloses an automatic dripping device, including a PLC control system, a metering tank and a reactor; the dripping pipeline is provided with a cut-off valve, a flow meter and a regulating valve connected in sequence; a temperature sensor and a pressure sensor are provided on an upper side wall inside the reactor and the temperature sensor and the pressure sensor are electrically connected to a display screen arranged on the outer surface of the reactor; a liquid level sensor is provided on a lower side wall inside the metering tank.

[0005] The dripping device disclosed in the above patent generally has the following technical problems during use:

[0006] 1. The dripping position is relatively fixed, which may lead to excessive local reaction;

[0007] 2. The dropping temperature cannot be adjusted. When the dropping temperature of the material is lower or higher than the appropriate process required temperature, the reaction yield will be affected due to temperature fluctuations.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0009] The utility model aims at the deficiencies in the background technology and provides an automatic dripping system for chloromethyl ether, which can make the dripping process uniform, avoid the problem of excessively violent local reactions, and realize the regulation of the dripping temperature to ensure that the dripping temperature is controlled within the range required by the process.

[0010] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0011] A chloromethyl ether automatic dripping system comprises a metering tank, a dripping tube is connected to the bottom of the metering tank, and an end of the dripping tube away from the metering tank is connected to a liquid distribution ring tube;

[0012] The dripping tube is sequentially installed with a feed valve, a flow meter, an electric regulating valve, an upper three-way valve and a lower three-way valve along the conveying direction;

[0013] A first on-off valve is installed between the upper tee and the lower tee; a side port of the upper tee is connected to the inlet pipe of the heat exchange tube bundle, and a second on-off valve is installed at the connection; a side port of the lower tee is connected to the outlet pipe of the heat exchange tube bundle, and a third on-off valve is installed at the connection.

[0014] Furthermore, the liquid distribution ring pipe is fixedly installed on the top of the inner cavity of the condensation reactor, and a plurality of dripping holes distributed in a circumference are opened on the tube wall of the liquid distribution ring pipe.

[0015] Furthermore, the flow meter and the electric regulating valve are installed on the horizontal section of the dripping tube.

[0016] Furthermore, the upper tee and the lower tee are installed on the vertical section of the drip pipe.

[0017] Furthermore, the heat exchange tube bundle includes a plurality of heat exchange tubes, each of which is provided with a plurality of fins for heat exchange.

[0018] Furthermore, the heat exchange tube bundle is installed in a sealed heat exchange shell.

[0019] Furthermore, a heat exchange medium inlet and a heat exchange medium outlet are provided on the side of the heat exchange shell, and the heat exchange medium outlet is located directly above the heat exchange medium inlet.

[0020] Furthermore, a plurality of guide plates are alternately installed inside the heat exchange shell.

[0021] Furthermore, the guide plate is a rectangular plate structure, and the guide plate is fixed to the inner wall of the heat exchange shell along the horizontal direction.

[0022] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0023] Chloromethyl ether enters the liquid distribution ring tube through the dripping tube, and is finally dripped into the condensation reactor through the dripping hole. The liquid distribution ring tube is set to ensure the uniformity of the dripping process and avoid excessive local reaction.

[0024] During the dropping process, chloromethyl ether can selectively flow into the heat exchange tube bundle and fully exchange heat with the heat exchange medium in the inner cavity of the heat exchange shell, so that the chloromethyl ether reaches a suitable dropping temperature, ensuring that the dropping temperature is controlled within the process requirements.

[0025] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the installation diagram of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the utility model;

[0028] Figure 3 It is a schematic diagram of the internal structure of the heat exchange shell.

[0029] In the figure, 1-metering tank, 2-drip tube, 3-liquid distribution ring pipe, 4-drip hole, 5-feed valve, 6-flow meter, 7-electric regulating valve, 8-upper three-way, 9-lower three-way, 10-heat exchange tube bundle, 11-first on-off valve, 12-second on-off valve, 13-third on-off valve, 14-heat exchange shell, 15-guide plate, 16-heat exchange medium inlet, 17-heat exchange medium outlet, 18-condensation reactor. DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1-Figure 3 As shown together, the utility model provides an automatic dripping system for chloromethyl ether, comprising a metering tank 1, a dripping tube 2 is connected to the bottom of the metering tank 1, and one end of the dripping tube 2 away from the metering tank 1 is connected to a liquid distribution ring tube 3.

[0032] The liquid distribution ring pipe 3 is fixedly installed on the top of the inner cavity of the condensation reactor 18, and a plurality of circumferentially distributed dripping holes 4 are opened on the wall of the liquid distribution ring pipe 3. The chloromethyl ether in the metering tank 1 enters the liquid distribution ring pipe 3 through the dripping pipe 2, and finally drips into the condensation reactor 18 through the dripping holes 4. The liquid distribution ring pipe 3 is provided to ensure uniform dripping process and avoid excessive local reaction.

[0033] The dripping tube 2 is sequentially installed with a feed valve 5, a flow meter 6, an electric regulating valve 7, an upper three-way valve 8 and a lower three-way valve 9 along the conveying direction.

[0034] The flow meter 6 and the electric regulating valve 7 are installed on the horizontal section of the dripping tube 2 to ensure accurate metering of the liquid material, and the upper tee 8 and the lower tee 9 are installed on the vertical section of the dripping tube 2.

[0035] A first on-off valve 11 is installed between the upper three-way valve 8 and the lower three-way valve 9 .

[0036] The side port of the upper tee 8 is connected to the inlet pipe of the heat exchange tube bundle 10, and a second on-off valve 12 is installed at the connection.

[0037] The side port of the lower tee 9 is connected to the outlet pipe of the heat exchange tube bundle 10, and a third on-off valve 13 is installed at the connection.

[0038] The heat exchange tube bundle 10 includes a plurality of heat exchange tubes, each of which is provided with a plurality of fins for heat exchange.

[0039] The heat exchange tube bundle 10 is installed in a sealed heat exchange shell 14 . A heat exchange medium inlet 16 and a heat exchange medium outlet 17 are provided on the side of the heat exchange shell 14 . The heat exchange medium outlet 17 is located directly above the heat exchange medium inlet 16 .

[0040] A plurality of alternately arranged guide plates 15 are installed inside the heat exchange shell 14 . The guide plates 15 are rectangular plate-shaped structures and are fixed to the inner wall of the heat exchange shell 14 along the horizontal direction.

[0041] The guide plate 15 guides the heat exchange medium in a serpentine shape, so that the heat exchange medium can be fully heat exchanged with the chloromethyl ether in the heat exchange tube bundle 10 , thereby achieving temperature control of the chloromethyl ether in the heat exchange tube bundle 10 .

[0042] The specific working principle of this utility model:

[0043] The chloromethyl ether in the metering tank 1 enters the liquid distribution ring pipe 3 through the dripping pipe 2, and is finally dripped into the condensation reactor 18 through the dripping hole 4. The liquid distribution ring pipe 3 is provided to ensure uniformity of the dripping process and avoid excessive local reaction.

[0044] When the temperature of the chloromethyl ether in the metering tank 1 is at a suitable dropping temperature, the feed valve 5, the electric regulating valve 7 and the first on-off valve 11 are opened, the second on-off valve 12 and the third on-off valve 13 are closed, and the chloromethyl ether in the metering tank 1 is added dropwise through the dropping tube 2 and the liquid distribution ring tube 3;

[0045] When the temperature of the chloromethyl ether in the metering tank 1 is lower than or higher than the appropriate dropping temperature, the feed valve 5, the electric regulating valve 7, the second on-off valve 12 and the third on-off valve 13 are opened, and the first on-off valve 11 is closed, and the chloromethyl ether in the metering tank 1 will flow into the heat exchange tube bundle 10, fully exchange heat with the heat exchange medium in the inner cavity of the heat exchange shell 14, so that the chloromethyl ether reaches a suitable dropping temperature, and then the dropping process is completed through the liquid distribution ring pipe 3.

[0046] 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. Chloromethyl ether automatic dripping system, characterized in that: It comprises a metering tank (1), the bottom of which is connected to a dripping tube (2), and one end of the dripping tube (2) away from the metering tank (1) is connected to a liquid distribution ring tube (3); The dripping tube (2) is provided with a feed valve (5), a flow meter (6), an electric regulating valve (7), an upper three-way valve (8) and a lower three-way valve (9) in sequence along the conveying direction; A first on-off valve (11) is installed between the upper tee (8) and the lower tee (9); a side port of the upper tee (8) is connected to an inlet pipe of the heat exchange tube bundle (10), and a second on-off valve (12) is installed at the connection; a side port of the lower tee (9) is connected to an outlet pipe of the heat exchange tube bundle (10), and a third on-off valve (13) is installed at the connection.

2. Chloromethyl ether automatic dripping system as claimed in claim 1, characterized in that: The liquid distribution ring tube (3) is fixedly mounted on the top of the inner cavity of the condensation reaction kettle (18), and a plurality of dripping holes (4) distributed in a circumferential manner are provided on the tube wall of the liquid distribution ring tube (3).

3. Chloromethyl ether automatic dripping system as claimed in claim 1, characterized in that: The flow meter (6) and the electric regulating valve (7) are installed on the horizontal section of the dripping tube (2).

4. The automatic dripping system of chloromethyl ether as claimed in claim 3, characterized in that: The upper tee (8) and the lower tee (9) are installed on the vertical section of the drip tube (2).

5. The automatic dripping system of chloromethyl ether as claimed in claim 1, characterized in that: The heat exchange tube bundle (10) comprises a plurality of heat exchange tubes, each of which is provided with a plurality of fins for heat exchange.

6. The automatic dripping system of chloromethyl ether as claimed in claim 1, characterized in that: The heat exchange tube bundle (10) is installed in a sealed heat exchange shell (14).

7. The automatic dripping system of chloromethyl ether as claimed in claim 6, characterized in that: A heat exchange medium inlet (16) and a heat exchange medium outlet (17) are provided on the side of the heat exchange shell (14), and the heat exchange medium outlet (17) is located directly above the heat exchange medium inlet (16).

8. The automatic dripping system of chloromethyl ether as claimed in claim 7, characterized in that: A plurality of guide plates (15) arranged alternately are installed inside the heat exchange shell (14).

9. The automatic dripping system of chloromethyl ether as claimed in claim 8, characterized in that: The guide plate (15) is a rectangular plate-shaped structure, and the guide plate (15) is fixedly connected to the inner wall of the heat exchange shell (14) in the horizontal direction.

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