Water blocking device used in kettle type concentration process of 2-methylimidazole reaction liquid

Abstract

The utility model discloses a water blocking device used in a kettle type concentration process of 2-methylimidazole reaction liquid, which comprises a buffer tank body, a baffle plate is arranged in the buffer tank body, a gas phase inlet is arranged on the side of the buffer tank body, a gas-liquid separator device is arranged in the buffer tank body, and a gas phase outlet is arranged on the side of the gas phase inlet. A gas-foam separation device is arranged in the buffer tank body, the gas-foam separation device is fixedly connected with a water guide pipe, a water outlet is formed in the bottom of the buffer tank body, and a gas phase outlet is formed in the top of the buffer tank body. And the separated liquid water can smoothly flow to the tank bottom along the water guide pipe and is regularly discharged, so that the water content in the steam is reduced, and the risk that the vacuum pump is damaged due to the entrainment of the liquid water is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of evaporation and concentration devices, and in particular to a water-blocking device used in the autoclave concentration process of 2-methylimidazole reaction solution. Background Technology

[0002] 2-Methylimidazole is an important intermediate in the production of nitroimidazole drugs such as metronidazole, ornidazole, and tinidazole, as well as the veterinary drug dimetridazole. These drugs are widely used in the treatment of trichomoniasis, gastric diseases, and for antibacterial and anti-inflammatory purposes. In the fine chemical industry, 2-methylimidazole is also the most commonly used epoxy resin curing agent and curing accelerator, widely used in coatings, adhesives, electronic packaging, and other fields.

[0003] The industrial production of 3-2-methylimidazole involves the synthesis of glyoxal, acetaldehyde, and ammonia. After the reaction, a large amount of water remains in the reaction system, requiring concentration to increase the concentration before 2-methylimidazole can be crystallized. To save energy and increase the concentration speed, vacuum concentration is typically used, with reciprocating screw vacuum compressors providing high vacuum and large pumping capacity. However, production experience shows that when a small amount of liquid water from the volatile gas in the concentration vessel enters the vacuum compressor, it can cause the compressor to malfunction, damaging the intake and exhaust valves and requiring replacement, or shortening the compressor's lifespan, resulting in losses in industrial production. Therefore, there is an urgent need for a device capable of removing liquid water from the concentrated vapor. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a water-blocking device for the kettle-type concentration process of 2-methylimidazole reaction liquid. By combining the elliptical baffle set in the buffer tank with the upper molecular sieve layer air-drop separation device, the gas phase containing water vapor is reduced from being directly sucked away by vacuum. At the same time, it ensures that the separated liquid water can flow along the water guide pipe to the bottom of the tank and be discharged periodically, which is beneficial to improving the stability of the concentration process and the product quality.

[0005] This utility model also provides a water-blocking device for the above-mentioned process of 2-methylimidazole reaction liquid concentration in a kettle, comprising: a buffer tank, a baffle plate inside the buffer tank, a gas phase inlet on the side of the buffer tank, a gas-liquid separator inside the buffer tank, a foam separation device inside the buffer tank, a water guide pipe fixedly connected to the foam separation device, a drain outlet at the bottom of the buffer tank, and a gas phase outlet at the top of the buffer tank. Through the above devices, the direct suction of the gas phase containing water vapor by the vacuum is reduced, ensuring that the separated liquid water can flow smoothly to the bottom of the tank along the water guide pipe and be discharged periodically, thereby reducing the water content in the steam and helping to avoid the risk of damage to the vacuum pump due to liquid water entrainment.

[0006] According to the present invention, a water-blocking device is provided for the kettle-type concentration process of 2-methylimidazole reaction liquid. The baffle is elliptical in shape and perpendicular to the gas phase inlet. The above device is beneficial to reduce the direct vacuum suction of the gas phase containing water vapor.

[0007] According to the present invention, a water-blocking device is provided for the kettle-type concentration process of 2-methylimidazole reaction liquid. The air-drop separation device is composed of molecular sieve layers and is located at the top of the buffer tank. The above device helps to ensure that the liquid water content is reduced.

[0008] According to the present invention, a water-blocking device is provided for the kettle-type concentration process of 2-methylimidazole reaction liquid. The height of the air-drop separation device is 0.3 to 0.5 meters. The air-drop separation device is connected to the water guide pipe. The above device is beneficial to improve the separation efficiency and guide the separated liquid water.

[0009] According to the present invention, a water-blocking device is provided for the concentration process of 2-methylimidazole reaction liquid in a kettle. The gas phase inlet is connected to the concentration kettle, and the gas phase outlet is connected to the vacuum pump. The above device is beneficial to block the entrainment of mist in the concentrated gas phase and avoid damage to the vacuum pump by liquid water.

[0010] Compared with existing technologies, this water-blocking device for the 2-methylimidazole reaction liquid in the kettle-type concentration process reduces the direct vacuum suction of the gas phase containing water vapor, and also ensures that the separated liquid water can flow smoothly to the bottom of the tank along the water guide pipe and be discharged periodically, thereby reducing the water content in the steam and avoiding the risk of damage to the vacuum pump due to liquid water entrainment. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0012] Figure 1 This is a front view of the water-blocking device of the present invention used in the autoclave concentration process of 2-methylimidazole reaction solution.

[0013] Legend:

[0014] 1. Gas phase outlet; 2. Gas-liquid separator device; 3. Baffle; 4. Gas phase inlet; 5. Air-droplet separator; 6. Water pipe; 7. Buffer tank; 8. Drain outlet. Detailed Implementation

[0015] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0016] Reference Figure 1 This utility model provides a water-blocking device for the kettle-type concentration process of 2-methylimidazole reaction solution, which includes as follows: Figure 1 As shown, it includes: a buffer tank 7, a baffle 3 inside the buffer tank 7, a gas inlet 4 on the side of the buffer tank 7, the baffle 3 being elliptical in shape and perpendicular to the gas inlet 4, the gas inlet 4 being connected to a concentration vessel, a gas-liquid separator 2 inside the buffer tank 7, a gas-liquid separator 5 inside the buffer tank 7, the gas-liquid separator 5 being composed of molecular sieve layers and located at the top of the buffer tank 7, the height of the gas-liquid separator 5 being 0.3 to 0.5 meters, a water guide pipe 6 being fixedly connected to the gas-liquid separator 5, the gas-liquid separator 5 being connected to the water guide pipe 6, a drain outlet 8 at the bottom of the buffer tank 7, and a gas outlet 1 at the top of the buffer tank 7, the gas outlet 1 being connected to a vacuum pump;

[0017] Specifically, the buffer tank 7, as the main body of the entire device, provides a processing space for the gas and liquid phases. An elliptical baffle 3 is installed inside the buffer tank and is perpendicular to the gas inlet 4 to reduce the direct suction of the gas phase containing water vapor by the vacuum pump. The gas inlet 4 is located on the side of the buffer tank 7 and is connected to the concentration vessel to introduce the water vapor phase containing mist. The mist separation device 5 is made of molecular sieve layers and is located at the top of the buffer tank 7 to further remove liquid mist from the steam. The water pipe 6 is connected to the mist separation device 5 to guide the separated liquid water to the bottom of the buffer tank 7. The drain outlet 8 is located at the bottom of the buffer tank 7 to discharge the liquid water collected after one production cycle. The gas outlet 1 is located at the top of the buffer tank 7 and is connected to the vacuum pump to discharge the steam after the liquid water has been removed.

[0018] Working principle: The water vapor phase containing mist in the concentration vessel enters the buffer tank 7 tangentially through the gas phase inlet 4. After encountering the vertically set elliptical baffle 3 in the buffer tank 7, some of the liquid water in the gas phase will adhere to the baffle 3, thereby removing most of the liquid water. The water vapor that is not completely separated from the liquid water will continue to rise and pass through the air-mist separation device 5 composed of a molecular sieve layer. This device can further capture and condense the tiny liquid droplets in the steam, enriching them on the molecular sieve and turning them into droplets. These droplets will then flow along the water guide pipe 6 to the bottom of the buffer tank 7. The liquid water collected at the bottom of the buffer tank 7 will be discharged from the tank through the drain outlet 8 after one production cycle. After being processed by the air-mist separation device 5, the steam with the liquid water removed will be discharged from the gas phase outlet 1 at the top of the buffer tank 7 and enter the vacuum pump for further processing.

[0019] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A water blocking device for use in a 2-methylimidazole reaction solution batch concentration process, characterized by, Include: Buffer tank body (7), the buffer tank body (7) inside is provided with baffle (3), the side of buffer tank body (7) is provided with gas phase inlet (4), the inside of buffer tank body (7) is provided with gas-liquid separator device (2), the inside of buffer tank body (7) is provided with gas foam separation device (5), the gas foam separation device (5) is fixedly connected with water guide pipe (6), the bottom of buffer tank body (7) is provided with drain (8), the top of buffer tank body (7) is provided with gas phase outlet (1).

2. The water blocking device for use in the 2-methylimidazole reaction solution kettle concentration process according to claim 1, characterized in that, The baffle (3) is oval, and is perpendicular to the gas phase inlet (4).

3. The water blocking device for use in the 2-methylimidazole reaction solution kettle concentration process according to claim 1, characterized in that, The gas foam separation device (5) is stacked by molecular sieve layer, and is located at the upper portion of the buffer tank body (7).

4. The water blocking device for use in the 2-methylimidazole reaction solution kettle concentration process according to claim 1, characterized in that, The height of the gas foam separation device (5) is 0.3-0.5 meters, and the gas foam separation device (5) is communicated with the water guide pipe (6).

5. The water blocking device for use in the 2-methylimidazole reaction solution kettle concentration process according to claim 1, characterized in that, The gas phase inlet (4) is connected with the concentration kettle, and the gas phase outlet (1) is connected with the vacuum pump.

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