Continuous reaction preparation system

Abstract

The utility model discloses a continuous reaction preparation system which comprises a raw material conveying loop which is connected with a gas conveying loop in parallel and conveys raw materials and gas into a first static mixer; the output end of the first static mixer is sequentially connected in series with the second static mixer and the third static mixer for mixing reaction; and the product intermediate storage tank is connected with the output end of the third static mixer and is used for storing the intermediate product output by the third static mixer. Compared with a conventional intermittent kettle type reaction mode, the preparation system has the advantages of high production efficiency, low labor intensity, low operation cost, high equipment utilization rate, low energy consumption, small online material quantity and the like, the reaction conversion rate can reach 99%, the molar yield can reach 99%, the reaction yield of N, N-dimethylamino propionitrile can be effectively improved, meanwhile, the reaction time can be shortened, and the production cost is reduced. The reaction is safer.

Description

Technical Field

[0001] The utility model relates to the field of chemical synthesis equipment, in particular to a continuous reaction preparation system. Background Art

[0002] Fabamocarb hydrochloride is a toxic fungicide with protective and therapeutic effects. It is harmless to higher animals and can be used to prevent and control cabbage downy mildew, radish black root disease, cabbage white rust, tomato soil-borne diseases, etc. N,N-dimethylpropionitrile is an important intermediate for the synthesis of fabamocarb hydrochloride.

[0003] Currently, the conventional synthesis method of N,N-dimethylpropionitrile is to prepare it by reacting acrylonitrile and dimethylamine gas. However, the conventional reactor used to prepare N,N-dimethylpropionitrile has the disadvantages of long reaction time, low equipment utilization and high energy consumption. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a continuous reaction preparation system.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a continuous reaction preparation system, comprising:

[0006] Raw material conveying circuit,

[0007] The raw material conveying circuit is connected in parallel with the gas conveying circuit to convey the raw material and gas into the first static mixer;

[0008] The output end of the first static mixer is sequentially connected in series with the second static mixer and the third static mixer to perform a mixing reaction;

[0009] The intermediate product storage tank is connected to the output end of the third static mixer and is used to store the intermediate product output by the third static mixer.

[0010] As a further description of the above technical solution: the raw material conveying loop includes an acrylonitrile storage tank, and the output end of the acrylonitrile storage tank is sequentially provided with a first valve and a second valve.

[0011] As a further description of the above technical solution: a first liquid level gauge is provided on the acrylonitrile storage tank.

[0012] As a further description of the above technical solution: the output end of the second valve is connected to the input end of the mass metering pump, the output end of the mass metering pump is connected to the condenser, and a temperature control system is provided on one side of the condenser to control the condensation temperature of the condenser.

[0013] As a further description of the above technical solution: the output end of the condenser is connected to a sight cup, and the output end of the sight cup is connected to the input end of the first static mixer.

[0014] As a further description of the above technical solution: the gas delivery circuit includes a gas flow meter, and the dimethylamine gas is delivered to the first static mixer through the gas flow meter.

[0015] As a further description of the above technical solution: a third valve is provided between the gas flow meter and the first static mixer.

[0016] As a further description of the above technical solution: a second liquid level gauge is provided on the product intermediate storage tank.

[0017] As a further description of the above technical solution: a fourth valve is provided at the lower output end of the intermediate storage tank of the product.

[0018] As a further description of the above technical solution: the acrylonitrile storage tank is connected to the upper part of the product intermediate storage tank through a pipeline.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] 1. The continuous reaction preparation system designed by the present application has the advantages of high production efficiency, low labor intensity, low operating cost, high equipment utilization, low energy consumption, and small amount of online materials compared with the conventional intermittent reaction method. It can make the reaction conversion rate reach 99% and the molar yield 99%, which can effectively improve the reaction yield of N,N-dimethylaminopropionitrile, shorten the reaction time, and make the reaction safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the preparation system proposed in the utility model.

[0022] Legend:

[0023] 1. First static mixer; 2. Second static mixer; 3. Third static mixer; 4. Acrylonitrile storage tank; 5. First valve; 6. Second valve; 7. First liquid level gauge; 8. Mass metering pump; 9. Condenser; 10. Temperature control system; 11. Gas flow meter; 12. Third valve; 13. Product intermediate storage tank; 14. Second liquid level gauge; 15. Fourth valve; 16. Sight glass. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Reference Figure 1 The utility model provides an embodiment: a continuous reaction preparation system, including: a raw material conveying circuit, the raw material conveying circuit and the gas conveying circuit are connected in parallel to convey the raw materials and gas into the first static mixer 1; the output end of the first static mixer 1 is sequentially connected in series with the second static mixer 2 and the third static mixer 3 for mixing reaction; the product intermediate storage tank 13 is connected to the output end of the third static mixer 3, and is used to store the intermediate product output by the third static mixer 3.

[0026] In the present embodiment, acrylonitrile is transported through a raw material transport loop, and dimethylamine gas is transported through a gas transport loop, and the two are sequentially passed through a first static mixer 1, a second static mixer 2, and a third static mixer 3 for mixed reaction, the first static mixer 1 mixes and reacts the received raw materials and gas, the first static mixer 1 fully mixes the two materials for reaction, and the reaction is carried out through the first static mixer 1, the second static mixer 2, and the third static mixer 3, and finally the fully reacted material enters the product intermediate storage tank 13 for preliminary storage of the reaction materials. By the above technical scheme, compared with the conventional intermittent kettle reaction method, it has the advantages of high production efficiency, low labor intensity, low operating cost, high equipment utilization, low energy consumption, and small online material quantity, and can make the reaction conversion rate reach 99%, the molar yield 99%, and can effectively improve the reaction yield of N, N-dimethylamino propionitrile, while shortening the reaction time and making the reaction safer.

[0027] The raw material conveying loop includes an acrylonitrile storage tank 4 , and an output end of the acrylonitrile storage tank 4 is sequentially provided with a first valve 5 for discharging the material and a second valve 6 for cutting off the raw material supply.

[0028] In this embodiment, the acrylonitrile storage tank 4 is connected to the first valve 5 and the second valve 6 through a pipeline. By controlling the opening and closing of the first valve 5 and the second valve 6, the transportation of the acrylonitrile raw material in the acrylonitrile storage tank 4 and the discharge of the residual waste are controlled. The first valve 5 is used to control the transportation of the acrylonitrile raw material in the acrylonitrile storage tank 4, and the second valve 6 can also be an emergency stop cut-off valve for emergency shutdown of the acrylonitrile transportation in an emergency.

[0029] The acrylonitrile storage tank 4 is provided with a first liquid level gauge 7 .

[0030] In this embodiment, the first liquid level meter 7 is used to display the remaining amount of raw material acrylonitrile in the acrylonitrile storage tank 4, so that the remaining amount can be monitored in real time and the raw material can be replenished into the acrylonitrile storage tank 4 in time to ensure the continuity of the reaction process.

[0031] The output end of the second valve 6 is connected to the input end of the mass metering pump 8 , and the output end of the mass metering pump 8 is connected to the condenser 9 . A temperature control system 10 is provided on one side of the condenser 9 to control the condensation temperature of the condenser 9 .

[0032] In this embodiment, the acrylonitrile raw material is transported through the mass metering pump 8 by opening the second valve 6. The mass metering pump 8 is used to control the flow rate of acrylonitrile. The output end of the mass metering pump 8 is connected to the condenser 9. The temperature can be controlled by the condenser 9 and the temperature control system 10. In this embodiment, the temperature of the cooling circulating fluid in the condenser 9 is controlled to be -10--5°C.

[0033] The output end of the condenser 9 is connected to the sight glass 16 , and the output end of the sight glass 16 is connected to the input end of the first static mixer 1 .

[0034] In this embodiment, the sight glass 16 is a stainless steel sight glass, and a glass pipe provided in the middle facilitates flow observation and determines the current condensation situation.

[0035] The gas delivery circuit includes a gas flow meter 11 , through which dimethylamine gas is delivered to the first static mixer 1 .

[0036] In this embodiment, dimethylamine gas is transported through a pipeline and connected to the input end of the first static mixer 1 to pass the dimethylamine gas into the first static mixer 1.

[0037] A third valve 12 is provided between the gas flow meter 11 and the first static mixer 1 for controlling the flow of dimethylamine gas.

[0038] The product intermediate storage tank 13 is provided with a second liquid level meter 14 , which provides accurate liquid level information so that the operator can monitor and control the storage amount of the liquid in the product intermediate storage tank 13 in real time.

[0039] A fourth valve 15 is provided at the lower output end of the product intermediate storage tank 13 for controlling the delivery of the liquid in the product intermediate storage tank 13 .

[0040] The acrylonitrile storage tank 4 is connected to the upper portion of the product intermediate storage tank 13 through a pipeline, so that the waste gas generated during the mixing reaction is discharged.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A continuous reaction preparation system, characterized in that: include: Raw material conveying circuit, The raw material conveying circuit is connected in parallel with the gas conveying circuit to convey the raw material and gas into the first static mixer (1); The output end of the first static mixer (1) is sequentially connected in series with the second static mixer (2) and the third static mixer (3) to perform a mixing reaction; The intermediate product storage tank (13) is connected to the output end of the third static mixer (3) and is used to store the intermediate product output by the third static mixer (3).

2. The preparation system according to claim 1, characterized in that: The raw material conveying loop comprises an acrylonitrile storage tank (4), and the output end of the acrylonitrile storage tank (4) is sequentially provided with a first valve (5) and a second valve (6).

3. The preparation system according to claim 2, characterized in that: The acrylonitrile storage tank (4) is provided with a first liquid level gauge (7).

4. The preparation system according to claim 2, characterized in that: The output end of the second valve (6) is connected to the input end of a mass metering pump (8), and the output end of the mass metering pump (8) is connected to a condenser (9). A temperature control system (10) is provided on one side of the condenser (9) to control the condensation temperature of the condenser (9).

5. The preparation system according to claim 4, characterized in that: The output end of the condenser (9) is connected to a sight glass (16), and the output end of the sight glass (16) is connected to the input end of the first static mixer (1).

6. The preparation system according to claim 1, characterized in that: The gas delivery circuit comprises a gas flow meter (11), and dimethylamine gas is delivered to the first static mixer (1) through the gas flow meter (11).

7. The preparation system according to claim 6, characterized in that: A third valve (12) is provided between the gas flow meter (11) and the first static mixer (1).

8. The preparation system according to claim 1, characterized in that: The product intermediate storage tank (13) is provided with a second liquid level gauge (14).

9. The preparation system according to claim 1, characterized in that: A fourth valve (15) is provided at the lower output end of the product intermediate storage tank (13).

10. The preparation system according to claim 2, characterized in that: The acrylonitrile storage tank (4) is connected to the upper portion of the product intermediate storage tank (13) via a pipeline.

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