Chloromethylation reaction system

Abstract

The utility model discloses a chloromethylation reaction system which comprises an etherification kettle, a liftable hollow main shaft is arranged in the etherification kettle, a plurality of flow dividing pipes communicated with an inner cavity of the hollow main shaft are arranged at the bottom end of the hollow main shaft, and paddles for stirring are arranged above the flow dividing pipes; the hollow main shaft is driven by the motor to rotate, the motor is fixedly connected above the etherification kettle, the motor is provided with an output shaft with a hollow structure, the hollow main shaft is arranged in the output shaft in a penetrating manner along the vertical direction, and the hollow main shaft is connected with the output shaft through a spline; the top end of a main body of the hollow main shaft is sequentially connected with a rotary joint and a tee joint; two side ports of the tee joint are respectively connected with an air inlet pipe and a cleaning liquid inlet pipe. According to the chloromethylation reaction system provided by the utility model, hydrogen chloride can be diffused in reaction liquid from bottom to top, so that the contact probability of gas and the reaction liquid is increased, and the reaction efficiency is improved; gas and liquid can share one conveying pipeline, so that the inner wall of the etherification kettle can be conveniently and comprehensively flushed to remove residues.

Description

Technical Field

[0001] The utility model relates to a chloromethylation reaction system and belongs to the technical field of chloromethyl ether synthesis. Background Art

[0002] Chloromethyl ether is also called chloromethyl ethyl ether, a colorless transparent liquid. The synthesis route of chloromethyl ether is: add phosphorus trichloride to 31% hydrochloric acid to make phosphorus trichloride and water undergo hydrolysis reaction, and the generated hydrogen chloride is sent to the etherification kettle to further react with polyformaldehyde, ethanol, etc. to generate the product chloromethyl ether, while phosphorous acid and hydrochloric acid are produced as by-products.

[0003] Hydrogen chloride is introduced into the etherification kettle to react with polyformaldehyde, ethanol, etc. to synthesize chloromethyl ether. Hydrogen chloride is directly introduced into the etherification kettle. Hydrogen chloride diffuses from top to bottom in the liquid. The diffusion rate is slow, and there are problems such as insufficient contact between gas and reaction liquid and low reaction efficiency.

[0004] After the chloromethyl ether is synthesized and discharged in the etherification kettle, part of the chloromethyl ether will remain on the inner wall of the etherification kettle and the stirring parts in the kettle. Since the etherification kettle is closed, the residue is not easy to remove.

[0005] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0006] The utility model aims at the deficiencies in the background technology and provides a chloromethylation reaction system, which can make hydrogen chloride diffuse from bottom to top in the reaction liquid, improve the contact probability between gas and reaction liquid, and improve the reaction efficiency; the gas and liquid can share a set of conveying pipelines, which is convenient for fully flushing the inner wall of the etherification kettle to remove residues.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A chloromethylation reaction system comprises an etherification kettle, wherein a hollow main shaft capable of being raised and lowered is installed inside the etherification kettle, a plurality of shunt pipes connected to the inner cavity of the hollow main shaft are installed at the bottom end of the hollow main shaft, and a paddle for stirring is arranged above the shunt pipes;

[0009] The hollow main shaft is driven to rotate by a motor, the motor is fixedly connected to the top of the etherification kettle, the motor is provided with a hollow output shaft, the hollow main shaft is vertically inserted into the output shaft, and the hollow main shaft and the output shaft are connected by a spline;

[0010] The top of the main body of the hollow main shaft is connected with a rotating joint and a tee in sequence, and two side ports of the tee are respectively connected with an air inlet pipe and a cleaning liquid inlet pipe.

[0011] Furthermore, the hollow main shaft is arranged in a vertical direction, and the blades are fixedly connected to the hollow main shaft.

[0012] Furthermore, the plurality of shunt tubes are distributed in a circumference, a plurality of through holes distributed in a spiral shape are opened on the tube wall of the shunt tube, and a through hole is opened on the end of the shunt tube away from the hollow main shaft.

[0013] Furthermore, the main body top end of the hollow main shaft is rotatably mounted in the lifting platform via a bearing seat.

[0014] Furthermore, guide rods and telescopic cylinders are arranged on both sides of the main body of the hollow main shaft, the head of the telescopic cylinder is fixedly connected to the lifting platform, and the tail of the telescopic cylinder is fixedly connected to the top of the etherification kettle; the guide rod is slidably arranged in the lifting platform along the vertical direction, and the bottom of the guide rod is fixedly connected to the top of the etherification kettle.

[0015] Further, the bottom port of the rotary joint is connected to the hollow main shaft, and the top port of the rotary joint is connected to the bottom port of the tee.

[0016] Furthermore, an air intake valve is installed on the air intake pipe, and a liquid intake valve is installed on the cleaning liquid inlet pipe.

[0017] Furthermore, a preparation liquid inlet and a tail gas outlet are provided on the top of the etherification kettle, the preparation liquid inlet is connected to the preparation kettle through a pipeline, and the tail gas outlet is connected to the tail gas absorption device through a pipeline.

[0018] Furthermore, a discharge pipe is provided at the bottom of the etherification kettle, the discharge pipe is connected to the stratification kettle, and a discharge valve is installed on the discharge pipe.

[0019] Furthermore, a jacket for temperature control is provided outside the etherification kettle.

[0020] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0021] The hydrogen chloride gas enters the hollow main shaft from the air inlet pipe, diffuses into the reaction liquid through the through hole on the diverter pipe to carry out chloromethylation reaction, and the hydrogen chloride diffuses in the reaction liquid from bottom to top. The paddles break up the large bubbles into small bubbles, which increases the contact probability between the gas and the reaction liquid and improves the reaction efficiency.

[0022] The cleaning liquid enters the hollow main shaft from the cleaning liquid inlet pipe and is sprayed out through the through hole on the diverter pipe. The telescopic cylinder drives the diverter pipe to rise and fall, thereby fully flushing the inner wall of the etherification kettle and removing the residual chloromethyl ether on the inner wall of the etherification kettle and the stirring parts in the kettle.

[0023] The utility model is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of the utility model;

[0025] Figure 2 This is a schematic diagram of the installation of the shunt pipe;

[0026] Figure 3 It is a schematic diagram of the connection between the hollow main shaft and the output shaft.

[0027] In the figure, 1-etherification kettle, 2-hollow main shaft, 3-paddle, 4-diverter pipe, 5-through hole, 6-lifting platform, 7-bearing seat, 8-guide rod, 9-telescopic cylinder, 10-motor, 11-output shaft, 12-rotating joint, 13-tee, 14-inlet pipe, 15-cleaning liquid inlet pipe, 16-inlet valve, 17-liquid inlet valve, 18-prepared liquid inlet, 19-exhaust gas outlet, 20-discharge pipe. DETAILED DESCRIPTION

[0028] 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.

[0029] like Figure 1-Figure 3 As shown together, the utility model provides a chloromethylation reaction system, including an etherification kettle 1, wherein a hollow main shaft 2 which can be raised and lowered is installed inside the etherification kettle 1, the hollow main shaft 2 is arranged in a vertical direction, a plurality of shunt pipes 4 which are connected with the inner cavity thereof are installed at the bottom end of the hollow main shaft 2, a paddle 3 for stirring is arranged above the shunt pipe 4, and the paddle 3 is fixedly connected to the hollow main shaft 2.

[0030] The plurality of shunt pipes 4 are distributed in a circumference, and a plurality of through holes 5 distributed in a spiral shape are opened on the pipe wall of the shunt pipe 4 . The end of the shunt pipe 4 away from the hollow main shaft 2 is opened with a through hole 5 .

[0031] The main body top end of the hollow main shaft 2 is rotatably mounted in the lifting platform 6 via a bearing seat 7, and the lifting platform 6 can drive the hollow main shaft 2 to move in the vertical direction.

[0032] Guide rods 8 and telescopic cylinders 9 are arranged on both sides of the main body of the hollow main shaft 2. The head of the telescopic cylinder 9 is fixedly connected to the lifting platform 6, and the tail of the telescopic cylinder 9 is fixedly connected to the top of the etherification kettle 1; the guide rod 8 is slidably arranged in the lifting platform 6 along the vertical direction, and the bottom of the guide rod 8 is fixedly connected to the top of the etherification kettle 1; the telescopic cylinder 9 provides power for the lifting and lowering of the lifting platform 6.

[0033] The hollow main shaft 2 is driven to rotate by a motor 10, and the motor 10 is fixedly connected to the top of the etherification kettle 1. The motor 10 is provided with an output shaft 11 with a hollow structure. The hollow main shaft 2 is vertically penetrated in the output shaft 11. The hollow main shaft 2 and the output shaft 11 are connected by splines. The output shaft 11 and the hollow main shaft 2 can transmit torque and slide relative to each other.

[0034] The top of the main body of the hollow main shaft 2 is connected with a rotary joint 12 and a tee 13 in sequence. The bottom port of the rotary joint 12 is connected to the hollow main shaft 2 , and the top port of the rotary joint 12 is connected to the bottom port of the tee 13 .

[0035] The two side ports of the three-way connection 13 are respectively connected to an air inlet pipe 14 and a cleaning liquid inlet pipe 15 . An air inlet valve 16 is installed on the air inlet pipe 14 , and a liquid inlet valve 17 is installed on the cleaning liquid inlet pipe 15 .

[0036] The top of the etherification kettle 1 is provided with a preparation liquid inlet 18 and a tail gas outlet 19 .

[0037] The preparation liquid inlet 18 is connected to the preparation kettle through a pipeline, and the preparation kettle is used to prepare paraformaldehyde and anhydrous ethanol in proportion.

[0038] The tail gas outlet 19 is connected to the tail gas absorption device through a pipeline, and the tail gas absorption device produces hydrochloric acid as a by-product.

[0039] A discharge pipe 20 is provided at the bottom of the etherification kettle 1 . The discharge pipe 20 is connected to the layering kettle, and a discharge valve is installed on the discharge pipe 20 .

[0040] The outside of the etherification kettle 1 is provided with a jacket for temperature control.

[0041] The specific working principle of this utility model:

[0042] The prepared mixed liquid of paraformaldehyde and anhydrous ethanol enters the etherification kettle 1 from the preparation liquid inlet 18; the motor 10 drives the paddle 3 to stir through the hollow main shaft 2; the air inlet valve 16 is opened, and the liquid inlet valve 17 is closed, and the hydrogen chloride gas enters the hollow main shaft 2 from the air inlet pipe 14, diffuses into the reaction liquid through the through hole 5 on the shunt pipe 4 to perform chloromethylation reaction, and the hydrogen chloride diffuses in the reaction liquid from bottom to top, and the paddle 3 breaks up the large bubbles into small bubbles, thereby increasing the contact probability between the gas and the reaction liquid and improving the reaction efficiency; when the hydrogen chloride gas is fed, the telescopic cylinder 9 extends to lift the shunt pipe 4 to above the liquid surface to prevent the reaction liquid from flowing back into the shunt pipe 4; the reaction product enters the stratification kettle through the discharge pipe 20.

[0043] After the reaction is completed, the liquid inlet valve 17 is opened, the air inlet valve 16 is closed, the cleaning liquid enters the hollow main shaft 2 from the cleaning liquid inlet pipe 15, and is sprayed out through the through hole 5 on the diverter pipe 4. The telescopic cylinder 9 drives the diverter pipe 4 to rise and fall, thereby fully flushing the inner wall of the etherification kettle 1.

[0044] 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. Chloromethylation reaction system, characterized in that: The etherification kettle (1) comprises a hollow main shaft (2) which can be raised and lowered, a plurality of flow dividers (4) which are connected to the inner cavity of the hollow main shaft (2) are installed at the bottom end of the hollow main shaft (2), and a paddle (3) for stirring is arranged above the flow dividers (4); The hollow main shaft (2) is driven to rotate by a motor (10), the motor (10) is fixedly connected to the top of the etherification kettle (1), the motor (10) is provided with an output shaft (11) with a hollow structure, the hollow main shaft (2) is vertically inserted into the output shaft (11), and the hollow main shaft (2) and the output shaft (11) are connected via a spline; The top end of the main body of the hollow main shaft (2) is connected in sequence to a rotary joint (12) and a tee (13), and two side ports of the tee (13) are connected to an air inlet pipe (14) and a cleaning liquid inlet pipe (15) respectively.

2. The chloromethylation reaction system according to claim 1, characterized in that: The hollow main shaft (2) is arranged in a vertical direction, and the blades (3) are fixedly connected to the hollow main shaft (2).

3. The chloromethylation reaction system according to claim 1, characterized in that: The plurality of flow dividing tubes (4) are distributed in a circumferential manner, a plurality of through holes (5) distributed in a spiral shape are provided on the tube wall of the flow dividing tube (4), and a through hole (5) is provided on the end of the flow dividing tube (4) away from the hollow main shaft (2).

4. The chloromethylation reaction system according to claim 1, characterized in that: The main body top end of the hollow main shaft (2) is rotatably mounted in the lifting platform (6) via a bearing seat (7).

5. The chloromethylation reaction system according to claim 4, characterized in that: Guide rods (8) and telescopic cylinders (9) are arranged on both sides of the main body of the hollow main shaft (2); the head of the telescopic cylinder (9) is fixedly connected to the lifting platform (6), and the tail of the telescopic cylinder (9) is fixedly connected to the top of the etherification kettle (1); the guide rod (8) is slidably arranged in the lifting platform (6) along the vertical direction, and the bottom of the guide rod (8) is fixedly connected to the top of the etherification kettle (1).

6. The chloromethylation reaction system according to claim 1, characterized in that: The bottom port of the rotary joint (12) is connected to the hollow main shaft (2), and the top port of the rotary joint (12) is connected to the bottom port of the tee (13).

7. The chloromethylation reaction system according to claim 1, characterized in that: An air intake valve (16) is installed on the air intake pipe (14), and a liquid intake valve (17) is installed on the cleaning liquid intake pipe (15).

8. The chloromethylation reaction system according to claim 1, characterized in that: The top of the etherification kettle (1) is provided with a preparation liquid inlet (18) and a tail gas outlet (19); the preparation liquid inlet (18) is connected to the preparation kettle via a pipeline, and the tail gas outlet (19) is connected to a tail gas absorption device via a pipeline.

9. The chloromethylation reaction system according to claim 1, characterized in that: A discharge pipe (20) is provided at the bottom of the etherification kettle (1), the discharge pipe (20) is connected to the layering kettle, and a discharge valve is installed on the discharge pipe (20).

10. The chloromethylation reaction system according to claim 1, characterized in that: The etherification kettle (1) is provided with a jacket for temperature control on the outside.

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